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� WHY THE HP HVACSYSTEM

The main reason for an HP HVAChumidification system is the enormousoperating cost savings compared to allother technologies. (High-Pressurehumidification however is generallyonly cost effective when the applicationrequires 250 lbs/hr or more.)

The HP HVAC humidifier is based ontwo well-known humidificationtechnologies: atomization andevaporation. Atomization nozzles areused to generate a uniform spray ofultra-fine water droplets and inject themdirectly into the air handling unit orduct. The patented mist eliminator hasan unusually large internal surface area,which drastically reduces and clearlydefines the humidification distance. TheMist Eliminator acts as apost-evaporator, boosting humidifierefficiency and delivering a 99% dropletfree air output.

BENEFITS

• Highly efficient humidifying andcooling with the HP HVAChumidifier.

• Quick and easy installation of thehumidifier, due to the modularstructure.

• Low energy consumption withhigh efficiency.

• Limited and inexpensiveservicing requirements (once ortwice per year).

• Minimum water consumption, nocoating in the duct and ultra-rapidmixing of fog with air flow, due

to the patented MicroCool®atomizing nozzle.

• High-pressure pump moduleready for installation withhigh-quality, wear-resistantcomponents.

• The mist eliminator with theanti-bacterial coating installeddownstream from the humidifierensures hygienic humidifieroperation.

• Excellent humidifier control(+/- 5% RH).

� MODULAR & FLEXIBLE

There are five basic modules that makeup the HP HVAC system:

1. High-Pressure PumpModule

2. Nozzle Section

3. Soft Charge ValveAssembly & ValveControl Panel

4. Mist Eliminator(Post–VaporizingElement)

- 1 - 1507489Form #07-404Pri

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din

Can

ada

AIRFOG - HP HVAC

ENGINEERING MANUAL

Ogdensburg, New York, U.S.A.(315) 425- 1255

Ottawa, Ontario, Canada(613)- 822-0335

Bottom of Plenumis to be sloped

towards drain

AirPlenum

Mist Eliminator

Valve

Assembly

Drains

Nozzle ManifoldsAIRFLOW

Valve Controller

Drain Pan

1

4

3

3

2

5 See RO System

Figure #1Typical HP HVAC Installation

5. Reverse Osmosis WaterTreatment System

FUNCTION

A High-Pressure pump (1)delivers hygienic reverse osmosis waterto the nozzle manifold lines (2) via softcharge magnetic valves (3). Specialpatented MicroCool High-Pressurenozzles generate a fine water mist. Theunique installation pattern of thenozzles, ensure that the water spray isuniformly introduced over a shorthumidifying sector in the unitcross-section. The percentage of wastewater is minimized and a humidifierinstallation length of 5 feet is achievedas a result of the patented misteliminator design (4).

Due to the short absorptiondistance, the HP HVAC system isideally suited for retrofits, includinginstallation in existing air washerhousings. The unique mist eliminatorsystem ensures that the humidified air is100% free of aerosols for a minimumcross-sectional loss of pressurethroughout the unit. The anti-bacterialseparating medium increases theoperating safety of the humidifier. TheHP HVAC is designed in every respectto state-of-the-art technologicalstandards.

There are three ways of humidifyingair:

ATOMIZATION (HP HVAC)

The atomization process producesan extremely fine spray of waterdroplets known as aerosols. Since theirsurface area relative to their weight isextremely large, they float in mid air.Aerosol with a diameter of 0.0004” fallsat a rate of just 4” an hour (0.001 mm at10 cm/hr). Even smaller aerosols can beproduced, which take a zigzag path asthey fall while avoiding air molecules.In this way, they are dispersedthroughout the room and completely fill

it. The relative surface area of anaerosol is conductive to the transfer ofmass and heat. The water is convertedto a gaseous state within a very shorttime.

VAPORIZATION

Vaporization takes place when thewater temperature is raised to theboiling point for the prevailingatmospheric pressure. Bubbles formedinside the liquid require only slightoverheating to evaporate at the surface.Since the water vapor is alreadygaseous, it mixes with the air in theatmosphere relatively easily. Steamhumidifiers usually work on thesaturated steam principle. The steamdoes not require any heat from the air toundergo the necessary change in itsstate, because it has already received itin the form of primary energy(electricity). Since the amount of steamused is relatively small compared withthe volume of air to be humidified, thehumidification process is virtuallyisothermal i.e. it takes place at aconstant temperature.

EVAPORATION (HP HVAC)

Evaporation takes place when aircomes into contact with a body ofwater, the surface of which shouldideally be as large as possible.Generally, the temperature of the air ishigher than that at the surface of thewater. The evaporation process istherefore a combination of water vaporand heat transmission. At the interfacebetween the air and the surface, therelative humidity is 100%: it is thussaturated. If the partial pressure of thewater vapor in the air is lower than atthe interface between water and air, thisdifference in pressure allows watervapor to enter the atmosphere.

During the evaporation process,the energy required to transform waterfrom a liquid to a gaseous state is takenfrom the air, which tends to cool the air.

A SINGLE SYSTEM FOR NEARLYANY SITUATION

The modular design of the HPHVAC system makes it suitable for awide range of applications. There are nolimits on the system’s capacity: it canbe geared exactly to the customer’sneeds, from minimal humidification allthe way to saturation point.

One single pump with multiplevalve controllers can accommodate upto 4 air handling units at a time.

Today, the use to whichair-conditioned premises are installedmay alter radically within the space of afew years. With the HP HVAC system,the amount of spray generated can bemodified to fit the customer’s exactneeds by the simple addition or removalof spray nozzles.

APPLICATIONS

The primary use of the HP HVACis for humidifying air in air-handlers orventilation systems. In the case of newsystems, the humidifier is usuallyintegrated in the air-handler. Therecommended length required of just 5feet (1.5 m) means that it can be keptrelatively short. The exact position ofthe humidifier inside the air-handler canbe chosen at will, this means that theHP HVAC can be installed on theintake or outlet side of the ventilationsystem.

The mineral free humidified airgenerated by the HP HVAC & reverseosmosis system, guarantees that nocomponents positioned downstreamfrom the outlet will be subject tocorrosion from mineral build-up.

FACTORS TO CONSIDER WHENSELECTING A HUMIDIFIERTECHNOLOGY

The HP HVAC system is also asuitable replacement for existinghumidification systems. Depending on

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the technology to be replaced,isothermal or adiabatic, various designfeatures of the existing system need tobe checked.

If the HP HVAC system isreplacing an isothermal humidifier, theexisting air heating capacity normallyneeds to be recalculated. Older systemsin particular often make allowances forsafety reserves. Under certaincircumstances, all that is required is aminimum temperature sensor to limithumidification capacity.

If the quality and the dimensionsof the existing humidifier housing issuitable for the HP HVAC, the newsystem can be installed with a minimumof modifications. If this is not feasible,the housing and framework need to bereplaced or fitted with new internalpaneling.

SUMMARY

The unique new HP HVAChumidification system is an inspiredcombination of atomization andevaporation technologies meeting alleconomic, and ecological needs.

Because of its modular design, theHP HVAC system facilitates a flexiblechoice of components and can beconfigured to suit exact requirements.This means an effective, individualsolution to any and everyhumidification problem.

� HP HVAC CRITERIA

When considering an HP HVACsystem for an application, first evaluateif the HP HVAC is the right choice.Here are a few criteria that need to bemet:

1. The cross-sectionalvelocity must be below 500fpm (254 cm/s).

2. An absorption distance of5 feet (1.5 m) is recommended

between the nozzle section and thecooling coil or mist eliminator.

3. Ability to compensate forthe adiabatic cooling?

4. Is there sufficientdrainage?

5. A capacity of 250 lbs/hr ormore.

APPLYING HP TO HVACSYSTEM

Before a system can be designed,it is necessary to determine thehumidification load. For more accurateload sizing please refer to AXAIRNORTEC's Form #XX-124B“Estimating Humidification Load” orAxair Nortec’s HumidificationEngineering and Loadsizing program(H.E.L.P. Software). The application inthe following example will requireapproximately 100 lbs/hr (45.5 kg/hr)with 20% outside air.

Once the humidification load andthe above conditions are known, it isnecessary to determine if the HVACsystem can absorb the amount of waterrequired to properly humidify the space.This is easily verified by using thePsychrometric Chart. Figure #2

(”Psychrometric Chart #1”) illustratesthe plotting of the above conditions.

AXAIR NORTEC recommendsthat the final relative humidity in theHVAC system be designed to remainbelow 80% RH. Conditions above 80%RH result in very long absorptiondistances or low efficiency of thehumidification system. Figure #3(”Psychrometric Chart #2”) shows thefinal relative humidity condition afterhumidification of 43% RH, taken intoaccount the adiabatic cooling, thiscondition is ideal since it is not over the80% RH leaving condition.

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EXAMPLE:

Office Building

20,000 CFM HVAC System

Face Velocity (500 ft/min) (2.54

m/s)

20% Outdoor Air (4000 CFM)

72°F (22.2°C) @ 40% RH indoor

design conditions40

50

60

70

80

85

120

.002

.004

.006

.008

.010

A) Space Design72°F (22.2°C) @ 40%RH

B) Condition before Humidifier74°F (23.3°C) @ 29%RH

Figure #2Psychrometric Chart #1

ADIABATIC COOLING

As water is evaporated by the airmoving past the High-Pressure nozzles,heat is removed from the air at a rate ofapproximately 1075 BTU’s/lb of waterevaporated. This adiabatic cooling willreduce the temperature of every 1000CFM (472 L/s) of air by an average of1°F for every pound of waterevaporated.

In the above application, 107,500BTU's of cooling are produced by theevaporation of the 100 lbs (45.4 kg) ofwater (full economizer).

Since adiabatic cooling, startingfrom point B, will create a temperaturedrop of 4.8°F (3.4ºC), the temperatureof the air moving through the HVACsystem will be lowered to 69ºF (20.5ºC)and the relative humidity will raise to43% (Point C). Therefore, in order to

maintain space conditions, the airtemperature can be heated prior tohumidification by an equivalent107,5000 BTU to attain a newhumidifier air temperature of 79ºF(26.5ºC).

EFFICIENCY FACTOR

The space in the HVAC systemavailable to absorb the moisturedischarged by the High-Pressurenozzles is usually restricted. Becausefog does not evaporate as quickly assteam, we must calculate our efficiencyfactor with the table below (Figure #4).

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Nortec HP Absorption Efficiency

20%

30%

40%

50%

60%

70%

80%

90%

100%

0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1

Z ratio (RH after - RH before)/(100-RH before)

Wate

rA

bso

rpti

on

%

0.008" @ 3' 0.008" @ 4' 0.008" @ 5'

Figure #4Efficiency Factor

40

50

60

70

80

85

120

.002

.004

.006

.008

.010

C) End result after humidifier,prior to heating69°F (20.5°C)

D) Pre-Heat Air to79°F (26.5°C)

Figure#3Psychrometric Chart #2

FORMULA: Temperature Drop

�T = BTUCFM x 1.10 (Constant)

�T = 107,500 BTU20,000 CFM x 1.10

�T = 4.8°F

Nortec HP Absorption Efficiency

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The higher the RH and airvelocity, the more distance is requiredto absorb the water. It is best to placethe HP HVAC nozzles at the location ofthe lowest air velocity in the system. Anideal location is before the cooling coilwhere any water droplets will impingeon the coil and re-evaporate or drainthrough the condensate drain. If thenozzles are to be placed in a highvelocity duct, the duct must beincreased in size to reduce the airvelocity (ft/min) and absorptiondistance.

This expanded duct work shouldbe water tight and a stainless steel drainpan must be installed. The drain panmust have two drains installed one priorto the Mist Eliminator and one after.The drains should be installed at thelowest point of each section.

Due to various air handlerconfigurations and varying conditionswithin an air handler the following is tobe used as a guide. The actualefficiency factor distance may differfrom calculated distance.

For example:

Calculated load: 500 lbs/hr

Distance between nozzles anddroplet filter: 5 ft

Nozzle orifice: 0.008”

Calculated Z ratio= 0.3

Therefore, the efficiency is 74%.To achieve a calculated load of 500lbs/hr, we will need to oversize themaximum capacity of my HP HVACsystem.

500 lbs/hr-------------- = 676 lbs/hr

0.74

LOCATING AIRFOG SYSTEMSWITHIN THE HVAC UNIT

After the previous design criteriahave been taken into consideration, thenozzle location in the HVAC unit canbe selected.

The nozzles are usually arrangedin the HVAC system to discharge in thedirection against the air flow.

Note: Nozzles are to have anunobstructed area within the absorptiondistance. Failure to provide a free areacauses droplets to form on surfaces incontact.

The nozzles are located onmanifolds installed in the HVACsystem. See Figure #5 (NozzleLocation). The manifolds should bearranged with the nozzles spacedequally over the largest surface areapossible to allow even dispersion of themoisture.

Figure #5 (Nozzle Location)shows the many locations within theHVAC unit for installation of the HPHVAC system. Select the location withthe most favorable Psychrometricconditions. Chart #3 (ManifoldLocation Pros and Cons) lists some ofthe advantages and disadvantages ofeach location.

When the system is located atposition C, the cooling coil will providea surface for large droplets to impactupon and evaporate or be drained away.If the nozzles are located at a distanceof 5 feet (1.5 m) or more away, only asmall percentage of the water willimpinge. If the nozzles are closer than 5feet (1.5 m), the loss to drain can bebetween 15-25% of the system capacity.

AXAIR NORTEC is continuallydeveloping and testing variousconfigurations of the HP HVACsystems, for applications which requirespecial considerations when applyinginto a HVAC unit it is recommended to

contact a local representative or AXAIRNORTEC for assistance.

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ReturnAir

Exh

au

stA

irO

uts

ide

Air

FilterHeatingCoil

CoolingCoil(acts as amist eliminator)

Supply Air

Drain Pan

A

B C D

E

RecommendedLocation

MistEliminator

Mist Eliminator

Airflow

MistEliminator

Mist Eliminator

Figure #5Nozzle Location

Manifold Location Pros Cons

AStable Temperature

Return air already conditioned. Possible highhumidity levels. Chance of wetting filters.Not recommended.

B Mixed air temperature and lower humidity Usually not enough heat for full absorption.Not recommended.

C RECOMMENDED location. Dryer air, coolingcoil acts as a natural mist eliminator

Usually not enough room between coil section forfull absorption.

D Well mixed air and temperature Possible chance of wetting the fan.

E Well mixed air and temperature Turbulent airflow. Chance of wetting ductsurfaces adjacent to the fan.

Chart #3Manifold Location Pros and Cons

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SYSTEM MODULES

1. High-Pressure Pump

2. Nozzle Section

3. Valve Control Panel & Soft

Charge Valve Assembly

4. Mist Eliminator(Post–Vaporizing Element)

5. Reverse Osmosis WaterTreatment System

1. HIGH-PRESSURE PUMP

There are two main types of pumps:

Features &Benefits

Triplex

Ceramic

Plunger

Pump c/w

Brass Heads

Stainless

Steel

Axial

Piston

Pump

Oil lubricated,

reduces noise levels (oil

changes every 500 hrs)

X

Water lubricated,

stainless steel

construction

X

Requires no oil changes X

No preventative

maintenance parts to be

replaced

X

No drive belts to

maintainX X

Optional variable

frequency drive

mounted directly on top

of motor. Makes a

small footprint (Not

available w/all models).

X

Suitable for De-Ionized

waterX

Pump Module Components

The HP HVAC system isengineered to the requirements of eachspecific application, however there arekey components that make up anysystem.

Frame - Medium pump modulecomponents are mounted on a powdercoated aluminum frame, motor andpump are mounted on arubber-dampened sub-frame.

Large pump module componentsare mounted on a skid fabricated fromcold rolled structural steel sections andplates to form a rigid, rugged structure,which includes points of attachment forall principal equipment. It is designedfor torsion and flexural rigidity takinginto account loads imposed duringrigging and operation with all weldingcarried out by certified structural steelwelders. The finished skid is blastcleaned to SSPC-SP6, then primed andpainted using an industrial paint.

Cover (Standard on mediumpump modules) - Powder-coatedaluminum with integral soundproofingto reduce ambient noise levels aroundthe pump.

Control panel - Mounted in anexternal enclosure, to the pump andmotor. Includes a manual on/off/autoswitch, fault light indicators, andconnection glands for power and controlwiring. Electrical terminal strip includesconnections for supply voltage, valvecontroller or humidistat wiring, andalarm circuit.

The control panel is also equippedwith a real time clock and accumulatedhour counter displayed on the smartrelay. A smart relay will indicate aservice warning at 100 hours prior tomaintenance due (Amber Lamp). Atservice due time, the pump module willstop and indicate a service fault (amberand red indicator lamps).

Low-pressure safety switch -Protects the pump against cavitationsand running dry in the event of a lowinlet water pressure below 20 psig (1.4bar). The switch will shut down pumpmodule, and must be manually restartedafter a fault. Maximum allowable waterpressure is 70 psig (4.8 bar).

Pressure regulating valve withexternal by-pass - Each pump is fittedwith a spring-loaded pressure-relief

G VFD 3500 PM 230 - 3

Pump Type:Giant orDanfoss

VariableFrequency

Drive

lbs/hr PumpModule

Voltage Phase

Medium Pump Module Large Pump Module

Figure #6Medium and Large Pump Module

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Oil lubricated, triplex ceramic plunger pump no Variable Frequency DriveModel Pump Frame Volts Phase Hz Amps KW Max. Circ. ProtectionG500PM 120-1 Medium 120 1 60 13.6 0.75 20G500PM 230-1 Medium 230 1 60 6.8 0.75 15G500PM 230-3 Medium 230 3 60 4.2 0.75 15G500PM 460-3 Medium 460 3 60 1.8 0.75 15G500PM 575-3 Medium 575 3 60 3.35 2.24 15G850PM 120-1 Medium 120 1 60 24 1.49 35G850PM 230-1 Medium 230 1 60 12 1.49 20G850PM 230-3 Medium 230 3 60 6.8 1.49 15G850PM 460-3 Medium 460 3 60 3.4 1.49 15G850PM 575-3 Medium 575 3 60 3.35 2.24 15G1100PM 120-1 Medium 120 1 60 24 1.49 35G1100PM 230-1 Medium 230 1 60 12 1.49 20G1100PM 460-3 Medium 460 3 60 3.4 1.49 15G1100PM 575-3 Medium 575 3 60 3.35 2.24 15G1550PM 230-1 Medium 230 1 60 16.8 2.24 25G1550PM 230-3 Medium 230 3 60 8.8 2.24 15G1550PM 460-3 Medium 460 3 60 4.4 2.24 15G1550PM 575-3 Medium 575 3 60 3.35 2.24 15G2300PM 230-3 Medium 230 3 60 13.4 3.73 20G2300PM 460-3 Medium 460 3 60 6.7 3.73 15G2300PM 575-3 Medium 575 3 60 5.2 3.73 15G3500PM 230-3 Large 230 3 60 20 5.6 35G3500PM 460-3 Large 460 3 60 10 5.6 15G5450PM 230-3 Large 230 3 60 26 7.46 40G5450PM 460-3 Large 460 3 60 13 7.46 20G5450PM 575-3 Large 575 3 60 10.4 7.46 15Oil lubricated, triplex ceramic plunger pump with Variable Frequency DriveGVFD950PM 230-3 Large 230 3 60 8.4 2.24 15GVFD950PM 460-3 Large 460 3 60 4.2 2.24 15GVFD950PM 575-3 Large 575 3 60 3.35 2.24 15GVFD1650PM 230-3 Large 230 3 60 8.4 2.24 15GVFD1650PM 460-3 Large 460 3 60 4.2 2.24 15GVFD1650PM 575-3 Large 575 3 60 3.35 2.24 15GVFD2100PM 230-3 Large 230 3 60 14 3.73 20GVFD2100PM 460-3 Large 460 3 60 7 3.73 15GVFD2100PM 575-3 Large 575 3 60 5.6 3.73 15GVFD3500PM 230-3 Large 230 3 60 21 5.6 35GVFD3500PM 460-3 Large 460 3 60 10.5 5.6 15GVFD3500PM 575-3 Large 575 3 60 8.4 5.6 15GVFD5000PM 230-3 Large 230 3 60 27 7.46 40GVFD5000PM 460-3 Large 460 3 60 13.5 7.46 20GVFD5000PM 575-3 Large 575 3 60 10.8 7.46 15Water lubricated, stainless steel pump with no Variable Frequency DriveD500PM 120-1 Medium 120 1 60 13.6 0.75 20D500PM 230-1 Medium 230 1 60 6.8 0.75 15D500PM 230-3 Medium 230 3 60 8.8 2.24 15D500PM 460-3 Medium 460 3 60 4.4 2.24 15D500PM 380-3 Medium 380 3 50 5.6 2.24 15D500PM 575-3 Medium 575 3 60 3.35 2.24 15D1100PM 120-1 Medium 120 1 60 24 1.49 35D1100PM 230-1 Medium 230 1 60 12 1.49 20D1100PM 230-3 Medium 230 3 60 8.8 2.24 15D1100PM 460-3 Medium 460 3 60 4.4 2.24 15D1100PM 380-3 Medium 380 3 50 5.6 2.24 15D1100PM 575-3 Medium 575 3 60 3.35 2.24 15D1800PM 230-1 Medium 230 1 60 16.8 2.24 25D1800PM 230-3 Medium 230 3 60 8.8 2.24 15D1800PM 460-3 Medium 460 3 60 4.4 2.24 15D1800PM 380-3 Medium 380 3 50 5.6 2.24 15D1800PM 575-3 Medium 575 3 60 3.35 2.24 15D2900PM 230-3 Large 230 3 60 13.4 3.73 20D2900PM 460-3 Large 460 3 60 6.7 3.73 15D2900PM 380-3 Large 380 3 50 8.2 3.73 15D2900PM 575-3 Large 575 3 60 5.2 3.73 15D3650PM 230-3 Large 230 3 60 20 5.6 35D3650PM 460-3 Large 460 3 60 10 5.6 15D3650PM 380-3 Large 380 3 50 12.1 5.6 20D3650PM 575-3 Large 575 3 60 8 5.6 15Water lubricated, stainless steel pump with Variable Frequency DriveDVFD500PM 230-3 Large 230 3 60 8.4 2.24 15DVFD500PM 460-3* Medium 460 3 60 1.8 1.1 15DVFD500PM 380-3* Medium 380 3 50 2.2 1.1 15DVFD500PM 575-3 Large 575 3 60 3.35 2.24 15DVFD1100PM 230-3 Large 230 3 60 8.4 2.24 15DVFD1100PM 460-3* Medium 460 3 60 2.6 1.5 15DVFD1100PM 380-3* Medium 380 3 50 3.3 1.5 15DVFD1100PM 575-3 Large 575 3 60 3.35 2.24 15DVFD1800PM 230-3 Large 230 3 60 14 3.73 20DVFD1800PM 460-3* Medium 460 3 60 3.7 2.2 15DVFD1800PM 380-3* Medium 380 3 50 4.7 2.2 15DVFD1800PM 575-3 Large 575 3 60 5.6 3.73 15DVFD2900PM 230-3 Large 230 3 60 21 5.6 35DVFD2900PM 460-3* Large 460 3 60 6.4 4 15DVFD2900PM 380-3* Large 380 3 50 7.9 4 15DVFD2900PM 575-3 Large 575 3 60 8.4 5.6 15DVFD3650PM 230-3 Large 230 3 60 27 7.46 40DVFD3650PM 460-3* Large 460 3 60 8.8 5.5 15DVFD3650PM 380-3* Large 380 3 50 11.1 5.5 15DVFD3650PM 575-3 Large 575 3 60 10.8 7.46 15*Requires DVDF Programming Kit. (One kit is interchangeable for multiple pumps)

Pump Modules

valve sized for 10% over pressure at themaximum pump flow rate. Dischargefrom the valve is piped back to the inletwater filter and re-circulated. Reliefmay occur during operation whenproviding a minimum demand to any airhandling unit. It is also capable ofmechanically regulating the operatingpressure to 1000 PSIG (69 bar).

Thermal relief valve - Ifhigh-pressure discharge water isrestricted from leaving the pumpmodule, the water retained in theinternal plumbing of the pumping unitbegins to heat up. It can heat up to suchan extent that it can damage the internalmechanism of the pumping unit.

Once the 110°F closing at 91°F.(43°C closing at 33°C.) presettemperature of the valve is reached, itopens and permits the hot water to bedischarged to drain. The hot waterdischarged is replaced by cool inletwater, bringing the overall temperatureinside the pumping unit down. Uponcooling, the thermal relief valve willclose.

Filter - Filtration of the inlet waterfilter ensures no large particles damagethe pump and cools the by-pass water.

Pressure gauges - The highpressure gauge is rated to 2000 PSIG.(138 BAR) and the low pressure gaugeis rated to 100 PSIG (7 BAR) and bothhave a 2.5" DIA. (63 mm DIA.) face.They are constructed using a stainlesssteel mechanism and housing withglycerin suspension fluid. They aregraduated in both Pounds Per SquareInch (PSI) and Kilo-Pascal (Kpa/BAR).

The high pressure gauge indicatesthe operating pressure of the system andis used while making any pressureadjustments to the system with thepressure regulator.

The low pressure gauge is used tomonitor the inlet water supply pressureto the pump after the filters.

Optional features:

Variable Frequency Drive –Allows for multi-efficient zone controls,and the pump to run at the minimumspeed required to maintain requiredoutlet pressure, reducing wear and tearon pump, achieving higher efficiency,higher pump life, and less maintenance.

Cover (Optional on large pumpmodules.) - Powder-coated aluminumwith integral soundproofing to reduceambient noise levels around the pump.

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2. NOZZLE SECTION

THEN: Irregular atomization,high energy consumption.

In the past, three basic types ofone-component nozzles have been usedto atomize the water, which producedirregular humidification, andhigh-energy consumption:

• Conventional washer nozzles withrelatively big openings0.12”-0.39” (3-10 mm) foratomizing large amounts of water(pump pressure approximately 28psig to 65 psig (1.5 to 4.5 bar)).

• Simple trickle-flow nozzles inspray pipes designed for direct,vertical irrigation of packingmaterial in contact humidifiers(pump pressure approximately 3psig to 7 psig (0.2 to 0.5 bar)).

• Various types of high-pressurenozzles designed to generate Coldsteam, mostly with externalatomizer elements (pump pressureapproximately 880 psig to 1763psig (60 to 120 bar)).

NOW: Uniform atomization,lower energy consumption.

In the HP HVAC system, thewater is introduced to the system viaatomization nozzles geared to the needsof individual applications. Thesegenerate a spray of extremely finedroplet at a pressure of 1000 psi (69bar). The nozzles have no protrudingatomizer elements (pin), which meansthey are not susceptible to mechanicaldamage or erosion and makes theinstallation much simpler.

Nortec’s MicroCool® Nozzle

The MicroCool® Patented nozzlehas a .008” (.020 mm) orifice andproduces water droplets of between10-40 microns in size without the use ofimpingement pins or compressed air.Each nozzle has a maximum capacity of

12 lbs/hr (5.4 kg/hr). The nozzle isconstructed with a 316 stainless steelhousing, and impeller for long life. Theinsert is also raised to help shed waterafter the nozzle has stopped fogging,which will reduce possible nozzleblockage. The MicroCool® nozzle ismade to tolerances of .00010” of aninch (.00254 mm). All nozzles have aViton o-ring seal for easy installationand removal if required without tools.Every nozzle is tested at Axair Nortecfor performance before shipping.

To prevent dripping after thesystem has shut down, all MicroCool®nozzles are screwed into anti-drip checkvalves.

Thread Pitch: 12/24 NC

Flow rate: 0.008” orifice, .025

gpm at 1000 PSI (12 lbs/hr)

2"

2"

Figure #7Typical Nozzle Spray Pattern

M IC R O C O O LPATEN ED N O ZZLE

O -R IN G

A N TI-D R IPSPR IN G

A N TI-D R IPC H EC K B A LL

A N TI-D R IPB O D Y

O -R IN G

PATENTED NOZZLE

HOUSING FORIMPELLER

Figure #8Nozzle Components

Arranging the Spray Nozzles

Position atomization lines so thenozzles can be pointed at an angle of20° to 30° perpendicular from thevertical position and into the air flow.See Figure #10.

This allows for maximumabsorption of the fog. Always avoidpointing nozzles directly into theairflow. If this angle cannot be achieve,then pointing them with the airflow isrecommended, but will reduce overallevaporation efficiency.

3. SOFT CHARGE VALVEASSEMBLY & VALVE CONTROLPANEL

Valve Control Panel

An integrated control systemregulates output by opening and closingmagnetic valves, which switch thevarious spray nozzles on and off. It alsoprocesses all standard sensor andcontroller output signals.

The control panel, located at theAHU or duct, receives a 0-10V signalfrom the humidistat or BMS. The PLCinside the panel processes the signal toactivate a combination of on/off softcharge valves (as shown above). It alsosends a signal to enable the pump tooperate when there is a demand forhumidity. Regardless of the humiditysignal, every 24 hours, the pump andall stages are activated for 2 minutesto flush the potential standing water

in the system to drain. Once thisprocess is terminated, the systemreturns to its normal operatingprocedures.

The panel converts the analog0-10 VDC demand signal to a outputpercentage requirement, and controlsthe output of the system.

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30 Deg.

AIRFLOWStainless SteelManifold

MicroCoolNozzle

Duct or AHUWalls

Figure #10Nozzle Orientation - Top View

* For on / off staging, connect all manifolds together.

3 STAGES 6 STAGES

Figure #9Nozzle Section - 3 and 6 stages

- 12 -

SOFT CHARGE VALVEASSEMBLY

Each valve assembly has 1, 2 or 3block valves and a dump valve.

Block valve: a 3/2 way valve with2 solenoids, one normally closed andone normally open. It allows to drainthe nozzle branch pipe runs when notoperated, as the normally open valveremains open when the solenoid is notoperated. The “Soft Charge”functionality allows you to operate thevalve as a flow divider when chargingthe line and thereby reduces the risk ofwater hammer and surge. This functionrequires a time delay between theactivation of the NC and NO solenoid.Each zone valve has a maximum flowrate of 8 gpm (144 lpm).

Dump Valve: A normally closed2/2 way valve allows you to purge thewhole valve assembly and nozzlemanifolds when activated to avoidbacteria growth. The valve is internallyconnected to the valve assembly andrequires no external piping. Maximumflow rate of 8 gpm (144 lpm).

Trigger points for block valveactivation from a 0-10 Vdc signal frombuilding management system orhumidistat:

1 stage (on/off) soft charge valveassembly

Stage 0 Valve 1 “OFF” – 0% Output

Stage 1 Valve 1 “ON” – 100%Output

3 stage soft charge valve assembly

Stage 0 Valve 1,2 “OFF” – 0%Output



Stage 3 Valve 1 and 2 “ON” – 100% Output

6 stage soft charge valve assembly

Stage 0 Valve 1,2,3 “OFF” – 0%Output




Stage 4 Valve 1 and 3 “ON” – 67%Output


Stage 6 Valve 1, 2, and 3 “ON” –100% Output

Stage 1, 2 & 3

Connections

Inlet

Drain

Valve Manifold

Valve Block

N/C Valve

N/O Valve

Dump Valve

Figure #116 Stage - Soft Charge Valve Assembly

Figure #12Valve Control Panel

- 13 -

4. MIST ELIMINATOR(POST–VAPORIZING ELEMENT)

Function

Evaporation is the second of thetwo humidifying technologies combinedin the HP HVAC humidifier. The use ofvaporizing elements in humidificationtechnology is nothing new; their job isto bring the air in the system intocontact with as large a moist surface aspossible. Achieving a highhumidification level depends not onlyon the size of the vaporizing surface,but also on the correct choice ofmaterial. It also guarantees a 99%aerosol-free air output.

MIST ELIMINATORCONSTRUCTION:

Media

The Media is a dual densityAntimicrobial filter media withdownstream tackifier. The media is 1inch in thickness and is supplied in a 4foot wide roll to the length specified.

Frame

90 degree Mounting Anlgessurroungd the ducts perimeter. TheMounting Angle is constructed of 20gauge 304 stainless Steel.

Support Frame

For duct width greater then 4 feeta Channel is required for additionalsupport. The Mounting Channel isconstructed of 20 gauge 304 stainlesssteel. An additional Mounting Channelis required for every 4 feet of ductwidth.

For Example:

8ft duct requires 1 Mounting Channel

10ft Duct requires 2 Mounting Channels

Wire Mesh

Wire Mesh is fastened to theMounting Angles and Channels. Thisprovides uniform support throughoutthe assembly. The Wire Mesh isconstructed of 304 Stainlees Steel

Standards & Classifications

• UL 900 Class 2, UL 94 HF-1

Air Resistance

One Panel Mist Eliminator -(Covers 100% of Cross Section).

Under dry conditions at 500 fpmthe air resistance is equal to 0.34” watercolumn. Once the media is wet, theresistance can increase up to 0.37”water gauge.

5. REVERSE OSMOSIS WATERTREATMENT SYSTEM

Adiabatic atomizing type systemsdischarge waterborne minerals directlyinto the space.

Filtering of the water will notremove these minerals and softeningwill simply change the calcium tosodium. This can be very corrosivewhen it settles onto surfaces within thespace. Water treatment systems such asReverse Osmosis system will removethe minerals but will add to the cost ofoperating the humidification system.

Principal of Operation

Reverse osmosis is one of severalpressure-based cross-flow filtrationtechniques in which the water to betreated is channeled tangentially acrossa semi-permeable membrane. As thewater passes through the membrane, itssurface collects all the impuritiesalthough the exact amount depends onthe separation technique used.Impurities of all kinds, such as dirt andmatter in suspension, germs, largemolecules, and even ions, are collectedon the surface of the membrane.

However, while ultra or microfiltration techniques are basicallysieving processes, reverse osmosismakes use of a principle that has beencopied from nature. If two solutionscontaining different quantities ofosmotically active substances, such as

Bottom of Plenumis to be sloped

towards drain

AirPlenum

Mist Eliminator

Valve

Assembly

Drains

Nozzle ManifoldsAIRFLOW

Valve Controller

Drain Pan

Figure #13Mist Eliminator

- 14 -

salts, are separated by a membrane thatis permeable to the solvent (in this casewater), the solvent will pass through themembrane until either a) theconcentration of salt in both solutions isthe same or b) a high hydrostaticpressure builds up in the vesselcontaining the concentration whichcounteracts the osmotic pressure andbrings the solvent diffusion process to ahalt. This pressure is equal to thedifference between the osmoticpressures found in the two solutions.However, if the pressure in the vesselcontaining the concentrate is increaseduntil it is higher than the osmoticpressure, the process can be reversedhence the term reverse osmosis. As aresult, the solvent flows from the moreconcentrated to the less concentratedsolution, leaving the solute behind. Thepure water, which passes through themembrane, is referred to as thePermeate.

Optimum Hygienic Standards

For hygienic reasons, wastewateris not recycled back to the spray unitbut drained off, thus eliminating theneed for a water basin.

The water used by the system isfully de-mineralized, which means itfully satisfies hygiene requirements forhumidifiers in areas designed withpeople in mind.

During the humidification process,the water is constantly on the move.Whenever the unit is inactive for longperiods of time, the pipes are flushedbefore the humidifier is switched onagain.

Figure #14RO Water Treatment CIV Series System

- 15 -

Two reasons why only treatedwater can be used for the HPHVAC system

1. Optimum protection for the systemand its components.

Experience with adiabatichumidifiers in recent years has made itclear that after atomization the mineralspresent in water settle inair-conditioning units, channels andeven rooms as a fine dust.

There are several good reasonswhy this should be avoided at all costs:

• Mineral deposits in ducts are anideal breeding ground for germs.

• Mineral deposits can damagedownstream components withwhich they come into contact.

• Removing the deposits istime-consuming and requireslarge quantities of materials.

• Mineral deposits in industrialpremises can hinder theproduction process and increasethe number of rejected goods.

In the HP HVAC system, thedroplet filters used guarantees 99% ofwater droplets. However, if untreatedwater were used, all the minerals wouldsettle in the media, where calcium andmineral salt deposits would quickly clogthe filter. There would be an increasingfall-off in pressure and the deposits,which would not be removable, woulddrastically shorten the life expectancyof the media. The use of treated waterguarantees that no mineral deposits areleft on the elements.

Water produced using the reverseosmosis method is virtuallycontaminant-free, where nothing butabsolute hygiene will fit the bill. This isa vital component in our all-roundhygiene concept.

2. What Does RO Remove?

Solute % Rejection

BicarbonateHCO2

95-96

Sodium Na 95-97

Fluoride F-1 94-96

Chloride Cl-1 95-97

Silicate SiO2-2 95-97

Nitrate NO3-1 93-96

Magnesium Mg+2 96-98

Nickel Ni+2 98-99

Copper Cu+2 98-99

Glucose 99+

Sucrose 99+

Bacteria &pViruses

99+

� TYPICALSPECIFICATION

1. GENERAL

1.1 WORK INCLUDED

a) NORTEC HP HVAC

Humidification system as indicated

on drawing[s] and as indicated on

schedule[s].

b) Complete and operable

humidification system [which

meets applicable building codes].

c) Equipment startup and

project report by qualified factory

trained representative.

1.2 RELATED SECTIONS

a) 5010 Mechanical General

Requirements

b) 15[ ] Piping Installation

c) 15[ ] Control System

1.3 REFERENCES:

a) ISO 9001-2000

1.4 SUBMITTALS:

a) Submit shop drawings and

project data for humidifier[s] and

control panel[s] in accordance with

Section [ ] Shop Drawings, Product

Data.

b) Exceptions to this

specification must be addressed

point by point on a separate sheet.

Failure to comply will result in

submittals being rejected.

c) Submit operation and

maintenance data for incorporation

into manual specified in Section[ ]

Operation and Maintenance

Manual.

1.5 SCHEDULES

a) Refer to information

contained in schedule[s] attached to

this specification.

b) Humidifiers to be of type,

capacity, and arrangement as listed

in schedule[s].

c) Include accessories listed

in schedule[s] and those accessories

require for type of unit.

� IN-DUCT HIGHPRESSURE NOZZLEHUMIDIFICATIONSYSTEM

Spec Note: Product specified is manu-

factured by AXAIR NORTEC in ISO

9001-2000 certified facilities.

� PART 2 – PRODUCTS

2. SYSTEM DESCRIPTION

1. High-pressure pump module

2. Nozzle section

3. Soft charge valve assembly

4.Valve controller

5. Mist eliminator

6. Reverse osmosis water treatment

system

2.1 HIGH-PRESSURE PUMPMODULE

High-pressure pump modules will be

fully factory built and tested; assembly

consisting of the following principal

components.

a) Triplex ceramic plunger

pump with brass heads.

a) Water lubricated, stainless steel

construction, requires no oil, which

consequently requires no oil

changes.

b) Direct connection to the

drive motor using a resilient shaft

coupling with bell housing.

c) Variable frequency Drive

(Optional): Allows for efficient

multi-zone controls, and allows the

pump to run at the minimum speed

required to maintain required outlet

pressure, thus reducing wear and

tear on pump, achieving higher

efficiency, greater pump life

expectancy, and less maintenance.

d) Frame: Components to be

mounted on a powder coated

aluminum frame, with suitable

vibration isolators.

Frame: Components to be mounted

on a powder coated cold rolled

steel skid, with suitable vibration

isolators.

e) Cover: Powder-coated

aluminum with integral

soundproofing to reduce ambient

noise levels around the pump.

f) Control panel: Built to a

NEMA 12 rated enclosure, external

to the pump and motor. Will

include a manual on/off/auto

switch, fault light indicator, service

light indicator, and connection

glands for power and control

wiring. A smart relay will indicate

service warning at 100 hours prior

to maintenance due.

g) Low-pressure cutoff

switch: Protects pump against

cavitations and running dry in the

event of a low inlet water pressure,

- 16 -

- 17 -

below 25 psig (1.7 bar). Unit will

shut down pump module, and must

be manually restarted after a fault.

Maximum allowable water pressure

is 70 psig (4.8 bar).

h) Pressure regulating valve

with external by-pass: Manually

regulates operating water pressure

to 1000 psi (69 bar). Bronze

construction with stainless steel

valve and valve seat.

i) High-pressure line drain:

A 24 Volt solenoid valve on the

pump module will drain water on

shutdown to ensure no residual

water is left in the high-pressure

piping between pump and nozzles.

j) Thermal relief valve:

Valve will open if the re-circulated

water in the pump reaches 110°F

(43°C), which is then replaced by

fresh (cool) water. Water is sent to

drain or sent back to the reverse

osmosis water reservoir.

k) Low pressure gauge:

Liquid filled, 0 to 100 psig

(0 to 7 bar)

l) High pressure gauge:

Liquid filled, 0 to 2000 psig

(0 to 138 bar)

m) All wetted parts including

piping: non-corrosive (brass or

stainless steel). Provide all

necessary dielectric isolation.

n) Working water pressure:

800-1200 psig (designed for 1000

psig).

2.2 NOZZLE SECTION

MicroCool’s ® patented design nozzles

to be used in each application.

a) Nozzle: 316 Stainless

Steel construction with a 0.008"

(0.203 mm) or 0.005” (0.127 mm)

machined orifice.

b) The median droplet size of

the nozzle will be between 10

micron and 40 micron (95% of

droplets at 15 micron) at 1,000 psig

(70 bar).

c) The 316 stainless steel

insert protrudes .04” (1 mm) above

the nozzle face to shed collection of

water around the nozzle orifice.

d) The nozzle includes a 316

stainless steel impeller inside the

insert for special “rifling” to ensure

continuous rotation.

e) The nozzle has a 12/24

UNC male thread.

f) Each Nozzle includes an

“anti-drip” valve with an integral

spring and ball. This unit closes at

pressures below 150 psig (10.5 bar)

to prevent dripping from the nozzle

orifice.

g) The nozzle manifold will

be either 3/8” O.D. or ½” (13 mm)

O.D. 304 stainless steel tubing as

specified in the schedule.

h) Nozzle lines shall be 3/8”

(9 mm) O.D. 304 stainless steel

tube with 0.35” (1.24 mm) wall

thickness or ½” (13 mm) 304

stainless steel tube with 0.29” (7.37

mm) wall thickness. Minimum

burst pressure - 6,000 psig (420

bar).

i) Nozzle risers are TIG

welded and cleaned at spacing

required by the design

specification. All welds and joints

are pressure tested prior to

shipping.

j) Stainless steel nozzle lines

will be jointed using 316 stainless

steel double-ferrule type

compression fittings.

k) Stainless Steel lines will

be prepared and shipped in special

containers to minimize damage

during transport.

l) A non-corrosive drain pan

must be installed between nozzle

manifolds and mist eliminator or

cooling coil. Provided by others.

2.3 SOFT CHARGE VALVEASSEMBLY

Allows the system to reduce waterhammer effects and to drain out nozzlemanifolds when there is no call forhumidity.

a) All Stainless steel

construction.

b) Each valve assemblies

have 1, 2 or 3 block valves and a

dump valve:

Block Valve: A 3/2 way valve with 2solenoids, one normally closed and onenormally open. It allows to drain thenozzle branch pipe runs when notoperated, as the normally open valveremains open when the solenoid is notoperated. The “Soft Charge”functionality allows operation of thevalve as a flow divider when chargingthe line and thereby reduces the risk ofwater hammer and surge. This functionrequires a time delay between theactivation of the Normally Closed andNormally Open solenoid. Each zonevalve has a maximum flow rate of 8gpm (144 lpm).

Dump Valve: A normally closed 2/2way valve allows you to purge thewhole valve assembly and nozzlemanifolds when activated to avoidbacteria growth. The valve is internallyconnected to the valve assembly andrequires no external piping. Maximumflow rate of 8 gpm (144 lpm).

c) Trigger points for block

valve activation from a 0-10 Vdc

signal from building management

system or humidistat:

- 18 -

1 stage soft charge valveassembly: (One block valve andone dump valve).

Stage 0 Valve 1 “OFF” – 0% Output


3 stage soft charge valveassembly: (Two block valves andone dump valve).

Stage 0 Valve 1,2 “OFF” – 0%Output



Stage 3 Valve 1 and 2 “ON” –100 %Output

6 stage soft charge valveassembly: (Three block valvesand one dump valve).

Stage 0 Valve 1,2,3 “OFF” – 0%Output






Stage 6 Valve 1, 2, and 3 “ON” –100% Output

2.4 VALVE CONTROLLER

An integrated control systemregulates output by opening and closingmagnetic valves, which switch thevarious nozzle manifolds on and off. Italso processes all standard sensor andcontroller output signals.

a) Receives a 0-10V signal

from the humidistat or building

management system (BMS).

Converts the analog 0-10 VDC

demand signal to a output

percentage requirement, and

controls the output of the system in

6 stages, 3 stages, or 1 stage

(on/off). See soft charge valve

assembly section for trigger points.

b) Sends a signal to enable

the pump to operate when there is a

demand for humidity.

c) Every 24 hours, the pump

and all the valves are activated for

2 minutes to flush the potential

standing water in the system to

drain.

d) 120 V to 24 Volt control

transformer.

e) Full frontal access with

key and lock door.

f) Powder coated, Sandtex

finish cabinet [inside and out].

g) Green lamp to indicate

power to control panel.

h) 3 amber lamps to indicate:

Stage 1, 2, and 3.

i) Terminal strip connection

for soft charge valve assembly.

j) Smart relay.

2.5 MIST ELIMINATOR

a) Patented offset design of

two droplet filters gives a 30 to

50% reduction in duct static

pressure.

b) Pressure drop: Must not

exceed 0.30 inches (0.75 cm) of

water column at 500 fpm (254

cm/sec) when media is wet.

c) Installed at a minimum

length of 4 ft (121 cm) from nozzle

manifold to ensure a reasonable

rate of efficiency.

d) Media: Quadrafoam is a

½” open cell polyurethane foam

specially coated to provide

improved fire retardation and fungi

resistance. It features deep loading,

and low air resistance for use in

extremely wide climatic conditions.

This ensures a long service life and

easy cleaning.

e) Frame: Roll formed into a

strong sturdy one-piece channel,

using .025 gauge, 3000 series

aluminum. The frame is tightly

fitted to filter media and fastened

with an aluminum rivet. The UL

listing, model number and airflow

direction are roll imprinted into the

frame. Part number is metal

stamped into frame for quick,

accurate identification.

f) Uni-Grid Support:

Expanded on our specially

designed Uni-Grid equipment,

using .040 gauge, 3000 series

aluminum. Droplet filters use the

Uni-Grid support on one side only.

g) Must meet the following

standards & classifications:

• UL 900 Class 2, UL 94 HF-1

• Telcordia NEBS GR-78-CORE

• Telcordia NEBS GR-63-CORE

• FMVSS 302

- 19 -

2.6 REVERSE OSMOSISWATER TREATMENT SYSTEM:

System to include a multiple stagewater treatment and purification systemfor chlorine, hardness, and TDS (totallydissolved solids) reduction withcapacities as listed in schedule[s] basedon the following:

a) Method of de-chlorination

based on a feed water flow rate of

x2 capacity listed in schedule[s].

b) Method of hardness

control based on a feed water flow

rate of x2 capacity listed in

schedule[s].

c) Reverse osmosis (RO)

system designed for feed water

analysis and based on capacity

listed in schedule[s] to include:

i. Safety sediment filter with

ÄÑ inlet and outlet gauges.

ii. Low pressure protection

switch.

iii. Inlet solenoid valve.

iiv. High pressure booster

pump.

v. High pressure braided hose

and fittings.

vi. High performance thin film

reverse osmosis membranes.

vii. Adjustable pump pressure

control valve.

viii. Adjustable re-circulation

control valve.

ix. Product, reject, and

re-circulation flow meters.

x. Pump and membrane vessel

pressure gauges.

xi. RO controller for automatic

operation.

xii. Digital TDS monitor with

alarm.

xiii. Powder coated support

frame and levelers.

d) Method of RO water

storage based on capacity listed in

schedule[s] to include:

i. Automatic level controls

ii. Access way and vent

iii. Inlet and outlet fittings

e) Distribution pump based

on capacity listed in schedule[s].

� PART 3 – EXECUTION

3.1 INSTALLATION

a) Install NORTEC HP

HVAC humidifier[s] as indicated

on drawing[s] and as indicated in

schedule[s] in accordance with

manufacturer’s instructions.

3.2 ACCESSORIES

a) Install accessories in

accordance with manufacturer’s

recommendations.

3.3 COMMISSIONING

a) Startup of humidifier to be

by qualified factory trained

technician.

- 20 -

� LIMITED WARRANTY

Walter Meier Inc. and/or Walter Meier Ltd. (hereinafter collectively referred to as THE COMPANY), warrant for a period of two

years from date of shipment, that THE COMPANY’s manufactured and assembled products, not otherwise expressly warranted, are

free from defects in material and workmanship. No warranty is made against corrosion, deterioration, or suitability of substituted ma-

terials used as a result of compliance with government regulations.

THE COMPANY’s obligations and liabilities under this warranty are limited to furnishing replacement parts to the customer, F.O.B.

THE COMPANY’s factory, providing the defective part(s) is returned freight prepaid by the customer. Parts used for repairs are

warranted for the balance of the term of the warranty on the original humidifier or 90 days, whichever is longer.

The warranties set forth herein are in lieu of all other warranties expressed or implied by law. No liability whatsoever shall be attached

to THE COMPANY until said products have been paid for in full and then said liability shall be limited to the original purchase price

for the product. Any further warranty must be in writing, signed by an officer of THE COMPANY.

THE COMPANY’s limited warranty on accessories, not of Walter Meier’s manufacture, such as controls, humidistats, pumps, etc. is

limited to the warranty of the original equipment manufacturer from date of original shipment of humidifier.

THE COMPANY makes no warranty and assumes no liability unless the equipment is installed in strict accordance with a copy of the

catalog and installation manual in effect at the date of purchase and by a contractor approved by THE COMPANY to install such

equipment.

THE COMPANY makes no warranty and assumes no liability whatsoever for consequential damage or damage resulting directly

from misapplication, incorrect sizing or lack of proper maintenance of the equipment.

THE COMPANY retains the right to change the design, specification and performance criteria of its products without notice or

obligation.

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