technical data - master group

Water Heat Source ECO CUTE: TECHNICAL DATA Information subject to change without notice.

Technical Data

Commercial / Industrial Water Heat Source Eco Cute

CO2 Hot Water Supply Heat Pump Unit

MAYEKAWA-HWW-2HTC Ver.1

・Before installing the unit, read carefully and understand the

contents of this manual. ・Any procedure which disregards the instructions given in

this manual could result in a serious accident. Read this manual carefully and have a thorough understanding of all the safety precautions.

!

Table of Contents


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Table of Contents 1. Safety Information ................................................................................. - 3 - 2. Warnings ............................................................................................... - 4 - 3. Specifications ........................................................................................ - 5 -

3-1. Specifications of the Unit ........................................... - 5 - 3-2. Range of Use ........................................................ - 5 - 3-3. Water Quality ........................................................ - 6 - 3-4. Performance Chart .................................................. - 7 - 3-5. Performance Diagrams ............................................. - 8 - 3-6. Outer Dimensions .................................................. - 11 -

4. Instructions for Installation .................................................................. - 12 - 4-1. Location of Installation Check Sheet .............................. - 12 - 4-2. Base Drawing (Anchor Location) .................................. - 14 - 4-3. Soundproof Treatment ............................................. - 15 -

5. Construction at Job Site ...................................................................... - 16 - 5-1. Power, Input / Output Signals ..................................... - 16 - 5-2. Pump Selection .................................................... - 18 - 5-3. Installation Procedures ............................................ - 19 - 5-4. Piping Guidelines .................................................. - 20 -

6. Operation Instructions ......................................................................... - 21 - 6-1. When Starting Up .................................................. - 21 - 6-2. When Stopping ..................................................... - 22 - 6-3. Alarm Stops and Auto-Stop ........................................ - 24 -

7. Maintenance ....................................................................................... - 26 - 7-1. Maintenance of Plate Heat Exchanger ........................... - 26 - 7-2. Maintenance Plan .................................................. - 27 -

1. Safety Information


- 3 -

1. Safety Information Read this manual carefully and familiarize yourself with the structure, the operating principles and procedures before installing this product. Safety and precautionary warnings provided in this instruction manual are classified into the following categories:

“DANGER” indicates a hazardous situation in which failure to observe all safety precautions will lead to death or serious injury and or major damage to the system.

DANGER:

“WARNING” indicates a hazardous situation in which failure to observe all safety precautions may lead to death or injury and or major damage to the system.

WARNING:

“CAUTION” indicates a hazardous situation in which failure to observe all safety precautions could lead to injury and or damage to the system. “CAUTION” also points out the unsafe practices around the machinery.

CAUTION:

!

!

!

2. Warnings


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2. Warnings This manual has been prepared in order to assure a safe and effective operation of the system. Keep this manual in a convenient, easily-accessible location near the system and study it frequently.

・Flammable: When this unit is exposed in a high temperature for a long period of

time, the refrigerant gas could relieve, or the container could explode. Keep fire away from the unit.

・Shock Hazard: Do not touch the terminal without shutting down the main switch and locking it out. Keep water away from the controller and all electrical equipment.

・Placing a Warning Sign: Place the warming sign where it can be easily seen on the outside of the machine. (Read P.33)

DANGER

This manual must be kept in a convenient, easily-accessible location near the

system and should be studied periodically by those working with the system. Any inspection or operation on this product should not be undertaken without a

thorough understanding of the instructions given in this manual Prior to commencing any inspection work on the product, read the safety warnings

provided at the beginning of this manual. Safety and warning labels are attached to the product. Do not remove these labels

or allow them to become dirty and unreadable. If this manual is lost or damaged, a replacement should be obtained immediately

from the nearest Mayekawa / Mycom office in your area. Any questions regarding this manual or the product should be addressed to the

nearest Mayekawa / Mycom office in your area. Do not climb on the product. The refrigerant could cause frostbite or blindness, when it comes in contact with

the skin or the eyes. Handle it with care. Mayekawa Mfg. Co., Ltd reserves the right to make changes or improvements to

its products without notice. It is possible, therefore, that some explanations given in this manual may not apply to a particular machine. If any uncertainty exists on the part of the unit operator, contact Mayekawa Mfg. Co., Ltd. or the nearest Mayekawa / Mycom office in your area.

WARNING

!

!

3. Specifications


- 5 -

3. Specifications 3-1. Specifications of the Unit

Type PG Cooling Water Cooling

Heat Recovery

Model HWW-2HTC

Refrigerant Type - R-744 (CO2) Fill ration lbs 24.25

Performance Heating Ability kW 50.0 82.0 101.9 Cooling Ability kW 350 61.7 82.3 Power Consumption kW 18.4 21.8 23.1

Power Supply 3ø AC200V 50Hz/60Hz

Compressor

Model - Semi Hermetic 2 Cylinder Reciprocating

Compressor MAYEKAWA 2HT

Star-up Method - Inverter (No volume control) Motor Designated Output kW 25

Oil Heater W 100

Water Heater

Model - 3 Cylinders Hot Water Condition °F 63/149 Water Amount L/min 15 24 30 Material - Copper Connecting Bore Diameter - Rc3/48 (20A)

Water Cooler

Model - BRAZED TYPE Plate Heat Exchanger Cool Water Condition °F 23/15.8 53.6/44.6 71.6/62.6 Water Amount L/min 125 177 236 Material - SUS316 Connecting Bore Diameter - Rc2B (50A)

Outer Dimensions inch W 44.88 x L 50.90 x H 75.55 Weight lbs Product Weight 2491 (Operating Weight 2520) Refrigerating Ton - 8.3

Protection equipment: - High pressure, low pressure, oil pressure,

compressor overload, discharge temperature, differential pressure, freeze-up, water failure

Paint Color - Munsell 5Y 7/1 Noise dB(A) 60

3-2. Range of Use Items Unit Conditions Heat Exchanger - Water Heater Water Cooler Type - - Brine cooling Water Cooling Heat RecoveryLiquid Type - Water Brine Brine or Water Brine or Water

Inlet Temperature °F 11 ~ 88.18 (11 ~ 143*2) -11 ~ 81.57 22 ~ 81.57 11 ~ 70.54

Outlet (exit) Temperature °F 143 ~ 198 -19.8 ~ 70.5 11 ~ 70.5 11 ~ 70.5 Inlet Water Pressure Psi 21.75 ~ 71.06 (When open) Flow Rate L/min 8 ~ 35 ≥100

Temperature Difference between Inlet and Outlet °F ≥ 77 Recommended : 11

*1. Read section 3-3 Water Quality for detail. *2. When the water from the outlet is at 194 °F

3. Specifications


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3-3. Water Quality

<Notes>

The heat exchanger equipped on this unit has a body that is replaceable; however, its structure does not allow any further disassembly to clean or to replace any other parts.

<Standard of Water-Purity>

It is ideal that treated water with a high quality comes in contact with the heat exchanger and the piping equipped on this unit. Using the tap water could shorten the life of the heat exchanger. Using water whose quality is below the standard can lead to scaling or damage on the piping.

<Use of Brine>

When choosing brine for cooling water, there is no limitation on its type or its density as long as the brine is not the type that leads to corrosion of the heat exchanger (Copper SUS316) such as calcium chloride. However, brine can lose its effectiveness when it absorbs the moisture in the air. With the increase of moisture within the brine it can create freeze-ups. Therefore, it is important to keep the area of contact between the brine and the air to a minimum. Check the quality of the brine regularly. Refill the brine as needed in order to maintain the quality.

ater Quality for Refrigerating and Air-ConditioningJRA-GL-02-1994

一過式

pH (25 C) 6.5 ~ 8.2 6.0 ~ 8.0 6.8 ~ 8.0 6.8 ~ 8.0 6.8 ~ 8.0 7.0 ~ 8.0 7.0 ~ 8.0 7.0 ~ 8.0 7.0 ~ 8.0 ○ ○

Electric Conductivity (25 C, mS/ below 80 below 30 below 40 below 40 below 30 below 30 below 30 below 30 below 30 ○ ○

Chrolide Ion (mgCI/L) below 200 below 50 below 50 below 50 below 50 below 50 below 50 below 30 below 30 ○

Sulphate Ion (mgSO42-/L) below 200 below 50 below 50 below 50 below 50 below 50 below 50 below 30 below 30 ○

Acid Consumption (pH4.8) (mgCbelow 100 below 50 below 50 below 50 below 50 below 50 below 50 below 50 below 50 ○

Calcium Hardness (mgCaCO3/Lbelow 200 below 70 below 70 below 70 below 70 below 70 below 70 below 70 below 70 ○

Total Hardness (mgCaCO3/L) below 150 below 50 below 50 below 50 below 50 below 50 below 50 below 50 below 50 ○

Ionic Status Silica (mgSD2/L) below 50 below 30 below 30 below 30 below 30 below 30 below 30 below 30 below 30 ○

Iron (mgFe/L) below 1.0 below 0.3 below 1.0 below 1.0 below 0.3 below 1.0 below 0.3 below 1.0 below 0.3 ○ ○

Copper (mgCu/L) below 0.3 below 0.1 below 1.0 below 1.0 below 0.1 below 1.0 below 0.1 below 1.0 below 0.1 ○

Sulphade Ion (mgS2-/L) ○

Ammonium Ion (mgNH4+/L) below 1.0 below 0.1 below 1.0 below 1.0 below 0.1 below 0.3 below 0.1 below 0.1 below 0.1 ○

Residual Chloride (mgCI/L below 0.3 below 0.3 below 0.3 below 0.3 below 0.3 below 0.25 below 0.3 below 0.1 below 0.3 ○

Free Carbon Dioxide (mgCO2/L below 4.0 below 4.0 below 4.0 below 4.0 below 4.0 below 4.0 below 4.0 below 4.0 below 4.0 ○

Stability Index 6.0 ~ 7.0 - - - - - - - - ○ ○

Tendency (2)Cycle System 低位 medium temp water高位 medium temp water

rculating Wa Corrosion Scale

Values of Standard Water Quality for Cooling Water / Refrigerated Water / Heated Water / Makeu

Items (1) (6)

Cooling Water (4)Refrigerated Water

Heated Water (3)

Ref

eren

ces*

Should NOT be detected

Makeup Wate 一過水Circulating

Water Makeup WateCirculatingWater [bet.

MakeupWater

CirculatingWater [bet.

MakeupWater

Sta

ndar

d Ite

ms

Notes:

(1) The standards and units are from JISK0101. (2) ◯suggests that there may be corrosion and scaling. (3) Generally, when the temperature is high (over 40 °C), there tend to be drastic corrosions. When

steel is exposed to the water without any protection, use anticorrosive agents and other treatments.

(4) The cooling water on the direct vent cooling tower: The circulating water in the closed circuit and the makeup water should be compared to the heated water’s quality standard. Also, the spray water and its makeup water should be compared to the circulating cooling water’s quality standard.

(5) The supply and makeup water should not be purified, or water that has been through softening treatment. It should be treated water (tap water), construction water, or underground water.

(6) The 5 items listed above are the major factors for corrosion and scaling.

CAUTION

According to a schedule check the water quality.!

3. Specifications


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3-4. Performance Chart

149 F Hot water supply temperature Heat Source F

Capacity Inlet water TemperatureInlet outlet 50 F 63 F 77 F 86 F 104

98.6 89.6 Heating

397,048 BTU

380,320 BTU

348,569 BTU

330,817 BTU

286,093 BTU

Cooling 29 TR 27 TR 24 TR 22 TR 18 TR

Power 21.6Kw 22.2Kw 24.2Kw 24.5Kw 26.Kw

71.6 62.6 Heating

362,908 BTU

347,887 BTU

319,209 BTU

299,066 BTU

255,367 BTU


Power 22.5Kw 23.1Kw 24.Kw 24.3Kw 25.6Kw

53.6 44.6 Heating 295,311 BTU

279,948 BTU

260,830 BTU

245,808 BTU

213,034 BTU


Power 21.2Kw 21.8Kw 23.2Kw 23.8Kw 24.4Kw

23 15.8 Heating

177,528 BTU

170,700 BTU

157,385 BTU

148,850 BTU

134,170 BTU



194 F Hot water supply temperature Heat Source F

Capacity Inlet water TemperatureInlet outlet 50 F 63 F 77 F 86 F 104

98.6 89.6 Heating

371,443 BTU

345,497 BTU

317,843 BTU

243,077 BTU

136,560 BTU



71.6 62.6 Heating

340,034 BTU

316,136 BTU

291,556 BTU

220,886 BTU

133,829 BTU


Power 27.Kw 26.4Kw 26.6Kw 27.Kw 27.1Kw

53.6 44.6 Heating

284,386 BTU

260,830 BTU

245,125 BTU

191,184 BTU

120,173 BTU



23 15.8 Heating

171,383 BTU

165,579 BTU

130,415 BTU 98,323 BTU 71,011 BTU


Power 19.4Kw 19.6Kw 19.Kw 19.6Kw 20.2Kw

3. Specifications


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3-5. Performance Diagrams

1. Heating Capacity and the amount of Produced Hot Water

a. Produced Hot Water at 65 °C

b. Produced Hot Water at 90 °C

Operation of the product with the condition beyond the maximum hot water supply value, for a long period of time will damage the equipment. Set the hot water supply temperature at 90 °C, or use equipment that limits the inlet (heated water inlet) temperature.

3. Specifications


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2. Cooling Capacity and the Amount of Produced Chilled Water

a. Produced Hot Water at 65 °C

b. Produced Hot Water at 90° C

The amount of chilled water indicates the amount when the differential temperature between the inlet and the outlet is fixed at 5 °C. Please note that In order to maintain the amount of 100L/min when operating with the condition below the minimum chilled water amount, the differential temperature must be below 5 °C.

Heat Source Water Inlet Temperature (°C) For reference only


3. Specifications


- 10 -

3. Power Consumption

c. Produced Hot Water at 65 °C

d. Produced Hot Water at 90 °C



3. Specifications


- 11 -

3-6. Outer Dimensions

4. Instruction for Installation


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4. Instructions for Installation

4-1. Location of Installation Check Sheet The location of installation should be considered in the designing stage. Use the check list below to see if there is any problem with the planned location.

Items Y/N Notes

1 The floor can support the weight of the Eco-Cute in operation. Structural reinforcement may be

required.

2 The shape and location of the base is compatible with Eco-Cute. Refer to the base drawing.

3 The floor requires anti vibration device or flexible joint in order to keep the noise from transmitting.

4 There is enough safety space.

5 The location is suitable for an install, operation, and daily maintenance. Secure safety space, aisles, and

handrails.

6 There is snow protection, if necessary. Make sure the snow will not cover the fresh air inlet.

7 There are soundproof walls. Refer to the law related to the noise and put soundproof walls accordingly.



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During the installation, secure a maintenance space for maintenance checks. The recommended maintenance check space is specified in the drawing below. If you cannot secure the recommended space, contact a Mayekawa / Mycom office.

Maintenance Space for 1 Eco-Cute Secure a large enough area of space to pull out the compressor. (Minimum 900mm.)

Space to pull out the heat exchanger

Safety space

Space to pull out the compressor

Gas cooler

Compressor

DANGER

Secure the escape route and safety space!

!



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4-2. Base Drawing (Anchor Location)

The holes on Eco-Cute for the anchor bolts are φ14. Use the chemical anchors for M12 (the depth over 6cm when horizontal seismic coefficient 1.5G).

*1: See the installation drawing for the actual outer dimension. *2: The dimension will change if there are changes made on the product. Make sure to

go over the installation drawing. *3: When the location of installation is rather peculiar, consult with a Mayekawa /

MYCOM office.

Anchor bolt for M12



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4-3. Soundproof Treatment

(1) Noise The noise value of this product is 60dB(A). If the noise from Eco-Cute compromises the living conditions of the neighboring people, you need to provide a sufficient soundproofing plan. In particular, this product is designed to give more benefits by storing the heat during the night when a discount for industrial use of electricity is given (*in Japan). The regulation for the noise during this time period is especially strict. Make sure to provide a sufficient soundproofing plan for this time period as well.

(2) Regulations Related to Noise Control (Japan)

Noise Control Standard

The City by-laws and regulations are required to determine the maximum allowable noise ([Noise Control Standard]) levels of each area, please consult them at time of install.

5. Construction at Job Site


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5-1. Power, Input / Output Signals

The drawing below describes the basic distribution diagram.

(1) Main Power The power supply is indicated below. Place the circuit breaker in areas required by the law.

Main Power 3φ AC200V 50/60Hz Rated Current 92.7 (A) Cable size for the main power 60sq (below 20M), E8sq Circuit breaker 250AF / 200AT

Water Source Eco-Cute

Outside Main Power Control

Power 3φ 200V 50/60HzRated current: 92.7A

ELB250AF/200AT

Chilled Water Pump

Supply Water Pump

Power for Pump

Output signals to outside Input signals from outside

Produced chilled water

Cold supply water

Produced hot water

Water Supply

Temperature control Two-way valve

Product Supply Range



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(2) Output Signals to Outside

The diagram below describes the output signals from Eco-Cutes.

Unit Damage (3)

Unit Operation (2)

EcoCute Outer Panel

Chilled water auto-shutoff (7)

Water supply auto-shutoff (6)

Chilled water pump command (5)

Water supply pump command (4)

Chilled water auto-shutoff; outputs that signal the chilled water condition is satisfied and shuts off the chilled water. Water supply auto-shutoff outputs that signal the hot water condition is satisfied and shuts off the hot water . Chilled water pump command output signal from Eco-Cute to start the chilled water pump. Water supply pump command outputs signal from Eco-Cute to start the water supply pump. Unit damage outputs to the panel that the unit is damaged and stopped. Unit Operation outputs to the panel to indicate that the unit is in operation.

(3) Input signals from outside The below diagram describes the input signals from the outside to Eco-Cute.

Emergency stop can be used as the outer connection for emergency stops. When the circuit is set to [CLOSE], Eco-Cute will be stopped. Chilled water pump confirmation is an interlock. When the confirmation cannot be made, it will set off the alarm. Water supply pump confirmation is an interlock. When the confirmation cannot be made, it will set off the alarm. Hot water request: When the circuit is set [OPEN], it indicates that the hot water is not required, and therefore the unit will not operate. If the produced hot water is always required, use a bypass. Chilled water request: When the circuit is set [OPEN], it indicates the chilled water is not required, and therefore the unit will not operate. If the chilled water is always required, use a bypass. Operation Command start and stop. [OPEN] indicates operation, and [CLOSE] indicates stop.

N24

Chilled water request (X2)

Operation Command (X1)

Eco-Cute Outer Panel

Emergency Stop (X6)

Chilled water pump confirmation (X5)

Water supply pump confirmation (X4)

Produced hot water request (X3)



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5-2. Pump Selection The loss of pressures in the unit by the pumps is described below. Take the piping at the job

site into consideration when selecting a pump.

(1) Loss in hydraulic head pressure of hot water

1 7 .8

1 2 .9

8 .7

5 .3

1 0

1 5

2 0

2 5

3 0

3 5

0 5 1 0 1 5 2 0

水頭損失　[m ]

出湯量　

[L/min]

(2) Loss in hydraulic head pressure of chilled water

5 .5

4 .4

3 .5

2 .8

2 .0

1 .4

0 .9

0

5 0

1 0 0

1 5 0

2 0 0

2 5 0

3 0 0

0 1 2 3 4 5 6

水頭損失　[m ]

冷水量　[L

/min]

Produced H

ot Water A

mount [L/m

in] C

hilled Water A

mount [L/m

in]

Loss in Hydraulic Head [m]

Loss in Hydraulic Head [m]



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5-3. Installation Procedures

1. Unloading

Use proper equipment to load and unload this product. Keep the weight and dimensions (listed below) in mind. Damage to the Eco Cute at this point will require inspection from a Mayekawa branch closest to you.

Specifications

Weight 2491 lbs

Outer Dimensions W44.88 inch x L50.90 inch x H75.55 inch

2. Installation This product can be installed on a rooftop. In that case, a crane will be used to lift it. Plan the installation with extreme care to avoid any physical injury. Make sure to use the proper lifting equipment.

When transferring or lifting the product, keep it level.

Anchoring point

Gravity point

WARNING

Do not stand under the product.

!

Over 60° Over 60°

Front Left Side



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5-4. Piping Guidelines

1. General guide

The piping work and thermal insulation treatment should be done after the installation of the product.

Do not confuse the inlet and the outlet of the hot water with those of the chilled water. Install a stop valve and an air purging valve as required.

2. Piping for hot water inlet Use a pipe that allows the flow rate of maximum 35L/min. On an open system, set the water inlet pressure as 0.15 ~ 0.49MPa. This construction should be considered a general construction method of inlet piping, with

an SUS 604 pipe or a cupper pipe. In order to keep the pipe surface dry, apply thermal insulation on the surface. If the operation is stopped during the winter time or the night in locations where the

temperature goes down below 0 °C, apply a protection against freeze-ups on the surface.

3. Piping for produced hot water outlet

Use a pipe made of SUS316 (with the temperature limit over 100°C). Although it depends on the material of the thermal insulation, apply heat insulation work

that is between 30 ~ 50mm. Install a check valve to avoid reverse flow.

4. Piping for chilled water

Make sure to install a 1.5mm strainer to keep foreign substances out. Install a gate valve in both inlet and outlet pipes. Install a connection port between the

gate valve and the unit for chemical cleansers and treatments. Make sure to use a pipe that can support more than the minimum chilled water flow

amount of 100L/min. Also, install a manual control valve. When it is an open system, set the inlet pressure for chilled water between 0.15 ~ 0.49

MPa. Although it depends on the material of the thermal insulation, apply heat insulation work

that is between 30 ~ 50mm. Again if the operation is stopped during the winter time or the night in locations where the

temperature goes down below 0 °C, apply a protection against freeze-up on the surface. (same has hot water inlet)

6. Operation Instructions


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6-1. When Starting Up

１． Select [Local] or [Remote] on the touch panel. ２． Eco-Cute receives both Hot Water and Chilled Water request signals. The unit will not start up

with only 1 signal. (Read P.17.) ３． On [Local] mode, press [ON] on the touch panel. On [Remote] mode, the operation signal is

released from a remote site. ４． When the water supply (inlet water) temperature is below 65 °C and when chilled water

temperature at the outlet is higher than 4 °C, the water supply two-way valve will open. ５． Eco-Cute receives operation confirmation signals from the water supply pump and chilled

water pump (interlock). ６． The flow of heated water and chilled water is confirmed. When the flow is not confirmed in 10

seconds, the water failure alarm or chilled water alarm is set off. Eco-Cute will not start. ７． The compressor starts up at 10 seconds after the pumps start running. Then Eco-Cute will

start up. *Reboot Timer(Reboot prevention timer)

A timer to prevent the hunting. Under any condition (both on Local and Remote), the system will not reboot until 3 minutes have passed after the compressor stops.



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6-2. When Stopping

Local Stop １． Press [OFF] on the touch panel. (When [Local] is on display.) ２． The compressor will stop. The water supply pump and the chilled water pump will stop 1

minute after the compressor. ３． The water supply two-way valve will close, and the whole operation will stop. ４． The system will not re-start, till the Reboot timer expires.

Remote Stop

１． Eco-Cute receives an Operation Stop signal from a remote site, or Eco-Cute requests either [Hot Water] or [Chilled Water].

２． The compressor will stop. The water supply pump and the chilled water pump will stop 1 minute after the compressor.

３． The water supply two-way valve will close, and the operation will stop.

Auto-Stop due to rising temperature of supplied water

１． When the temperature of supply water (inlet water) becomes over 65 °C, the compressor will stop.

２． After 1 minute, the water supply pump and the chilled water pump will stop. ３． The water supply two-way pump will close, and the system will be in auto-stop. ４． The system will recover automatically in 30 minutes.

Auto-Stop due to lowering temperature of chilled water

１． When the temperature of chilled water at the inlet becomes below 4 °C, the compressor will stop.

２． After 1 minute, the water supply pump will stop (the chilled water pump will continue working). ３． The water supply two-way valve will close, and the system will be in auto-stop. ４． Until the recovery conditions are satisfied, the system will not signal the operation command

to the chilled water pump. The unit will not start during this time. ５． When the recovery conditions are satisfied, the operation command from the system to the



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unit, will signal automatically. Without this operation command, the chilled water pump will not start.

※ If you wish to stop the chilled water pump during an auto-stop, send Stop Command before the pump stops due to

lowering temperature of the chilled water.



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6-3. Alarm Stops and Auto-Stop

(1) Alarm Stops

There are a few Alarm Stops programmed to protect the system. The Alarm Stops are listed below. After Alarm Stops, the system will start again after the alarm is cancelled (reset) and the operation command is received.

Alarm Names Initial Value Description The Causes

Rising discharge pressure 15 [MPa] System stop due to abnormal

rising in discharge pressure Auto-stop due to the values beyond set value is repeated 5 times

Lowering suction pressure 1.5 [MPa]

System stop due to abnormal lowering in suction pressure.

Auto-stop due to the value below set value is repeated 3 times.

Lowering differential feeding pressure 0.1 [MPa]

System stop due to abnormal lowering in differential feeding pressure.

(Feeding pressure – Suction pressure) is below the set value for 60sec.

Rising differential pressure 11 [MPa]

System stop due to abnormal rising in differential pressure between discharge and suction pressure

Auto-stop due to the values beyond set value is repeated 3 times.

High pressure sensor error 1.3 [MPa]

System stop or operation denied due to abnormal lowering in discharge pressure

Below the set value

(Lowering suction pressure) Refrigerant leak 1.3 [MPa] Operation denied due to abnormal

rising in suction pressure Below the set value for 20 sec.

Rising discharge temperature 150 [�] System stop due to abnormal

rising in discharge temperature Auto-stop due to the values beyond set value is repeated 3 times.

Compressor overload 114 [A] System stop due to

compressor overload. Beyond the set value

Motor overheat - System stop due to abnormally high temperature of compressor motor

-

Operation jam - System stop due to compressor / pump error, or operation denied due to compressor / pump start failure

-

Chilled water failure 100 [L/min] System stop due to abnormal lowering in chilled water flow.

Below the set value for 10 sec.

Heated water failure 7～8 [L/min] System stop due to abnormal

lowering in hot water flow. Below the set value for 10 sec.

Damaged pump - Operation denied due to damaged pump. -

Damaged SHC - Operation denied due to break in expansion valve or heating temperature control

-



- 25 -

(2) Auto-Stops

There are a few Auto-Stops programmed to protect the system. When the conditions are satisfied, the unit will recover automatically. When the number of retry reaches the set value, Alarm Stop will not allow the unit to start. However, when the unit operates continuously for 30 minutes, retry count will be reset. Rising in the water supply (inlet water) temperature and lowering in the chilled water temperature has no set value for retry (no alarm stops programmed).

Auto-Stops Names Initial Value Auto-Stop Conditions Recovery Conditions Retry

Allowed

Rising in discharge pressure 2175 [Psi] Beyond the set value 180 sec after reboot

time sets off 5

Lowering in suction pressure 217 [Psi] Below the set value for 30

seconds 180 sec after reboot

time sets off 3

Rising in differential pressure 1595 [Psi]

(Discharge pressure – Suction pressure) is below

the set value for 5 sec.

180 sec after reboot time sets off 3

Rising in discharge temperature 302 [F] Beyond the set value 180 sec after reboot

time sets off 3

Rising in water supply (inlet water)

temperature 149 [F] Beyond the set value for 10

seconds. Inlet temperature 140 °F for 30mins -

Lowering in chilled water temperature 39.2 [F] Below the set value for 30

seconds Chilled water temperature at 50 °F, and 180 sec after

reboot time sets off -

7. Maintenance

- 26 -

7. Maintenance 7-1. Maintenance of Plate Heat Exchanger

（1） Inspection items before season

① Test water quality ② Clean strainer ③ Check flow rate ④ Confirm operating conditions (pressures, flow rates, inlet/outlet temperature, etc.)

（2） Cleaning methods

① Make sure there is a pipe connecting port on the water inlet pipe for treatments. Also, make sure there is a valve in front of inlet connecting port and behind outlet connecting port.

② Connect the pipe to circulate the treatments into the inlet/outlet pipe of the heat exchanger. Fill the heat exchanger with the treatments (at 50 ~ 60 °C), and let it circulate for about 2 ~ 5 hours. The circulating time depends on the temperature of the treatments and the amount of scales. Use the changing color of the treatments to judge the circulation and cleaning time.

③ After finishing the cleaning fill the heat exchanger with a treated water solution of 1~2% sodium hydrate (NaOH) or bicarbonate of soda (NaHCO3) for about 15~20 minutes in order for neutralization.

④ After the neutralization, rinse the inside of the heat exchanger with clean water. ⑤ Confirm that the heat exchanger operates properly after the cleaning.

Treatments used to clean the scale, formic acid, citric acid, oxalic acid, acetic acid, or phosphoric acid

dilute to 5%. Do not use hydrochloric acid, sulfuric acid, and nitric acid, as they are highly corrosive. Before using a cleaning treatment, make sure it is not corrosive to stainless steel and copper. Contact the maker of the treatments for details of proper cleaning methods.

7. Maintenance

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7-2. Maintenance Plan

MFG. Co., Ltd.

(2008-10) Ver.1 C600001-0

technical data - master group

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