model ncm 300 zone control system - ewcaux. ht. 4:31 pm 72 o fr fan autoon system cool off heat em....

The NCM 300 panel provides intelligent control of Heat

Pump or Conventional forced air zoning systems at a

maximum of three zones using motorized dampers and

practically any off-the-shelf heat/cool thermostat. With

features like automatic changeover, one zone setback

feature, field selectable timers and supply air sensing

capability, the NCM 300 provides a high level of

performance in a non-expandable zone control panel.

Perfect for new construction and retro-fit applications.

Will control heat pumps with O or B

type reversing valves and electric

auxiliary heat. Will also control 1 or 2

stage gas or oil fired furnaces, with

single stage electric air conditioning.

The NCM300 panel features automatic

changeover from any thermostat

allowing for individual zone comfort

from the HVAC system.

The STATUS LED blinks slowly during

normal operation to indicate the micro

processor is operating properly.

A total of 9 LED’s indicate the system

status and mode of operation.

LEDs labeled Zone 1 thru Zone 3

indicate which dampers are energized

to open.

Operates on 24VAC power supplied

from a separate transformer. A single

40VA transformer can power all three

zones, with a total of four dampers.

8va draw per damper.

The NCM300 has a thermal circuit

breaker in place of a fuse, and

protects the panel from shorts in the

thermostat and damper field wiring. It

does not protect against shorts in the

HVAC system wiring.

CAUTION: When the circuit breaker is

tripped it will get quite hot. To reset the

breaker, locate and repair the short,

remove the 24vac power for 30

seconds and then restore it.

The panel has a built-in circuit that

monitors the computers performance

and resets the panel if an error occurs

in operation or due to power failures.

Any zone can activate the indoor fan

and only the dampers in zones calling

for continuous fan operation will open.

Continuous fan operation will only

occur when there are no heating or

cooling calls.

Zone Capacity

CompatibleHVAC Systems

CompatibleThermostats

AutomaticHeat/CoolChangeover

Status LED

Figure 1. NCM300 panel

System LEDs

Damper LEDs

Operating Power

ThermalBreaker

Watch DogCircuit

Indoor FanControl

EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362 E-Mail- [email protected]

Model NCM 300 Zone Control SystemTB-206

P/N 090375A0206 REV. J Copyright C EWC Controls 2000 All Rights Reserved

LEAVE THIS BULLETIN ON THE JOB SITE FOR FUTURE REFERENCE

NCM-300

2

1

SUPPLYAIR

SENSOR

C

W

Y

R

G

ZONE 3T'STAT

C

W

Y

R

G

ZONE 2T'STAT

C

W

Y

R

G

EM

ONEZONE

ZONE 1T'STAT

M6

M4

M2

M1

ZONE 3MOTOR

M6

M4

M2

M1

ZONE 2MOTOR

M6

M4

M2

M1

ZONE 1MOTOR

R

C

24 VACT'FORMER

O

Y

G

W2/E

W1/B

RH

RC

SYSTEM

CONTROL SYSTEM

5

10

1520

25

30

352nd STAGE

TIMER

34

37

4043

46

49

52LOW TEMP

LIMIT

120

110

130140

150

160

170HIGH TEMP

LIMIT

CONTROLS INC.Englishtown, NJ

R

R7

C8

F1

RC/RHLINK

R14

R26

K1

K2

K3

D3

D4

D5

R35

R44

R51

R56

K4

K5

K6

K7

D7

D8

D9

D10

D6

+

C1 D1 R4 R8

CPURESET

TIMERRESET

C4

D2

U1

U2

U3

U4

U5

C6 C7

R6

R5

R10

R9

R11

R13

R12

R18

R19

R23

R24

R25

R29

R30

R34

R32

R33

R40

R39

R42

R43

R41

R46

R47

R49

R48

R50

R54

R55

R59

R58

R60

R61

R63

R62

R65

C5Y1

R38

R37

R52

R53

R57

R45

C2

C3

R15

R17

R16

R21

R20

R22

R28

R27

R31

Z1

R36

OFF < > ON

S1

FAN DELAY OFF < > ONPURGE 60s < > 90sAUTO CHANGEOVER 2m< >5mSYSTEM HEAT PUMP< >GASFAN HYDRO < > GASOP SYS 0m< >20mSAS OFF < > ON NOT USED

STATUSLED1

LED2

LED4

LED3

LED6

LED5

LED7

LED8

LED9

SUPPLY AIR LIMIT

ZONE 3 OPEN

ZONE 2 OPEN

ZONE 1 OPEN

W2 / EM

W1 / REV VALVE

COMPRESSOR

FAN

Regardless of the application, use standard 24vac, 4/5 wire heat/cool mechanical or electronic thermostats in all zones! Mercury, Battery, and Power robbing types that draw less than 20 ma of current can also be used. Compatible with a select type of heat pump thermostat in zone 1 only.

Controls two or three air zones with

most 24vac Power Open/Closed or

Spring Assisted motorized dampers.

NC

M3

00

Ve

r 1.2

Co

pyrig

ht E

WC

/AC

I 200

2 A

LL rig

hts

rese

rve

d

Momentarily pressing the TIMER

RESET button clears the built-in

timers controlling the minimum run

timer, short cycle timer, W2 timer, and

the changeover timer. This enables

you to test the installation faster.

Caution should be observed when

using this button.

Momentarily pressing the CPU RESET

button resets the computer.

TIMERRESET

Timer Reset BUTTON

SYSTEMRESET

CPU Reset BUTTON

AUTO 2m < > 5mCHANGEOVER

SYSTEM TYPE HEATPUMP < > GAS


110

120

130140

150

160

170

HEATING LIMIT

34

37

4043

46

49

52COOLING LIMIT

The panel has built-in timers that

insure reliable operation.

When a call is activated the panel will

run the system in that mode for a

minimum of 2 minutes.

When the system is satisfied, the

panel will not resume the same call for

a minimum of 2 minutes.

A built-in timer prevents the system

from rapidly switching between

heating and cooling. At the end of a

call, an adjustable 2 or 5 minute timer

is started and the panel will not switch

to the opposing system until the timer

has expired.

The W2 TIMER sets the total amount

of time delay before second stage

heating is energized. 1st stage heat

will stay energized when 2nd stage

heat activates.

The Heating Limit potentiometer sets

the supply air temperature at which

the heating is cycled off and the fan

continues to run, until the supply air

temperature has dropped below the

heating limit set point.

The Cooling Limit potentiometer sets

the supply air temperature at which

the cooling is cycled off and the fan

continues to run, until the supply air

temperature has risen above the

cooling limit set point.

Built-In TimerSettings

Minimum RunTimer

Short CycleTimer

ChangeoverTimer

5

10

1520

25

30

35

W2 TIMER

Stage TwoHeating Timer

Heating and Cooling Limit Settings

*Short Cycle Timer

*Minimum Run Timer

*Changeover Timer

*Opposing System Service Timer

*Second Stage Heating Timer

2 minutes, fixed.

2 minutes, fixed.

2 or 5 minutes

.20 minutes, fixed.

5 to 35 minutes,adjustable.

DIP switch 1 allows the NCM300 to

operate the fan during the 60/90 second

purge mode. Works in heat and cool

mode. Set the switch to OFF to allow the

system to operate it’s own fan purge.

7 DIP switches allow you to select the features that will

allow the panel to operate your HVAC system.

DIP switch 2 selects a purge time of 60

seconds or 90 seconds. The damper(s) on

the last zone(s) calling will be held open

for 60 or 90 seconds.

Select between 2 or 5 minutes of

change over time delay. The panel will

not switch to the opposing system

until the timer has expired.

Select the type of HVAC system the

panel is controlling. Heat Pump or

Gas/Oil/Hydronic heat with A/C.

Selecting the Options Using the DIP Switches

Select the GAS position when setting

up for gas or heat pump applications.

Select HYDRO when setting up for

straight electric or hydronic heating

applications.

Select 20 minutes of time delay for

opposing system calls or, 0 minutes

and the panel will work on majority

rules only.

Select ON if you are using a Supply

Air Sensor with the NCM300. Select

OFF if you have not installed a sensor.

NOTE: DIP SWITCH #8 HAS NO FUNCTION

AND IS NOT USED!

FAN DELAY OFF < > ON

PURGE 60s < > 90s

FAN HYDRO < > GAS

OP SYS 0m < > 20m

SAS OFF < > ON

3EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-635-8646 E-Mail- [email protected]

WARNING: THESE PANELS ARE DESIGNED FOR USE WITH 24VAC. DO NOT USE OTHER VOLTAGES! USE CAUTION TO

AVOID ELECTRIC SHOCK OR EQUIPMENT DAMAGE. ALL WIRING SHOULD BE DONE TO LOCAL AND NATIONAL CODES

AND ORDINANCES. USE 18 AWG SOLID COPPER, COLOR-CODED, MULTI-CONDUCTOR THERMOSTAT CABLE.

ThermostatWiring

INSTALLATION INSTRUCTIONS

Typical heat/cool thermostat wiring in zone 1, 2, or 3.

Figure 2a.

ZONE THERMOSTAT

60 708050

50

60

70

80

RYW G

SYSTEM

COOL OFF HEATAUTO ON

FAN

C

W

Y

R

G

EM

ONEZONE

ZONE 1T'STAT

Figure 2b. Typical heat/cool or heat pump application wiring in zone 1, with separate Vacation or Emergency Heat switch. Part #VAC or RES.

The NCM300 zone control panel requires standard 1 stage heat/cool thermostats in all zones,

regardless of the application. 2nd stage heat output is controlled by an adjustable timer on the

panel. The NCM300 will work with a select type of heat pump thermostat in Zone 1 only. Easy

thermostat wiring diagrams are shown below.

Figure 2d. Wiring for heat pump thermostat in zone 1. NOTE: Constant L output in the Emergency heat mode. Remove the factory jumper between W1 and Y terminals and install a new jumper between W1 and E terminals.

Honeywell #T8011 or T8411ZONE THERMOSTAT

C

W

Y

R

G

EM

ONEZONE

ZONE 1T'STAT

ZONE THERMOSTAT

OptionalVAC or RES

SWITCH

60 708050

50

60

70

80

RYW G

SYSTEM

COOL OFF HEATAUTO ON

FAN

C

W

Y

R

G

EM

ONEZONE

ZONE 1T'STAT

Hold SelectEm. Ht.Aux. Ht. 4:31pm 72

o

Fr

FAN

Auto On

SYSTEM

Cool Off Heat Em. Ht.

BLGORW2YEW1C

*

**

*NEW JUMPER

**REMOVE JUMPER

Zone 1 will also accept heat pump style thermostats with a constant 24vac output during emergency mode, and separable W1 and Y terminals. These thermostats can be field configured & programmed to conventional heat / cool operation.

A White Rodgers Model 1F94-371 programmable is compatible with the NCM300. A Honeywell T-8011 programmable or T-8411 non-programmable is also compatible. These versatile thermostats can be set up in Conventional mode, and still allow use of the Heat pump features. (i.e. Emergency Mode)

HEAT PUMP THERMOSTATS

C

Y

R

G

EM

ONEZONE

ZONE 1T'STAT

E2GRY1W2W1EC

*

Program thermostat for “Heat Pump 3 mode”.Add jumper wire as shown.Set the “E2/P” switch to E2.

ZONE THERMOSTAT #1

W

WHITE-RODGERS1F94-371

*

Zone 1 will accept heat pump style thermostats with a constant 24vac

output during Emergency Mode, and/or separable W1 and Y terminals.

Use a programmable White Rodgers 1F94-371 or Honeywell Model

T8011 programmable or T8411 non programmable. Other compatible

Models include the White Rodgers 1F93-380, 1F95-377, and the

CTC Model# 43403.

Figure 2c.

3

4

2REDLED

4

The NCM300 panel was designed to

be easy to understand and wire up.

We have provided several typical

diagrams to review. Your actual field

wiring may vary.

Typical gas/electric system wiring

using a single transformer is shown

below. Note the jumper (link)

between RC and RH. There is no

need to install your own jumper.

System Wiring

SingleTransformerGas/Electric Systems

Heat Pumpwith O TypeReversing Valve

Two TransformerSystems


Figure 3a.

Figure 3c.

Figure 3b.

Simple Fossil Fuel Application

Figure 3d. Single stage heat pump and 1or 2 stage furnace.

XOYC

R

W2

W1

Y

G

C

R

B R W

OUTSIDE AIRT’STAT 25* F.Part# BTDP

GAS/OILFurnace

1or2 STAGE

HEAT PUMP1 STAGE

FOSSIL FUEL SET-UP w/OAT

O

Y

G

W2/E

W1/B

RH

RC

SYSTEM

NCM300

Discharge AirT-stat 135* F.

NOTE: Discharge Thermostat can be adjustable Snap-disctype, or Remote bulb type.Opens on temperature riseto lockout the “Y” circuit.Range = 100 - 200 F.

RC/RHLINK

W2/E

W1/B

SYSTEMSYSTEM

RHRC

O

YG

RC/RHLINKRC/RHLINK

Cut Rc/Rh JumperCut Rc/Rh Jumper

CIRCULATORRELAY OR HOT

WATER ZONE VALVECONNECTION

T

T

OILBURNER

PRIMARYCONTROL

Y

C

Y

G

C

R

Y

G

C

R

TYPICAL FANCENTER

TERMINALBLOCKOUTDOOR

CONDENSINGUNIT *W W*

T

T

Either OneNot Both

TT

ISOLATION TERMINALS OR WIRES

* Note: Your Air Handler may include a W terminal. That means it may have it’s own isolation circuit. If you can confirm this, simply connect the W1/B terminal to the W terminal on the air handler. Do not cut the Rc / Rh jumper. Wire up your Oil Burner, Circulator relay, or Hydronic Zone valve to the isolation contacts or wires provided in the air handler. (Follow dashed lines)The fan is controlled via time delay relay inside the air handler.

NCM300

Typical heat pump system wiring with electric

resistance backup heat. Wire up the reversing

valve to either O or W1/B, depending on your

type of system. Applies to air cooled or

geothermal / ground source systems.

Conventional Heat Pump System

AIR HANDLERWITH 1 0R 2 STAGE

ELECTRIC RESISTANCE BACKUP HEAT

HEAT PUMP1 STAGE

NCM300

X / W

OorB

Y

C

R

W2/E

W1/B

SYSTEMSYSTEM

RH

RC

O

YG

RC/RHLINKRC/RHLINK

W2

W1

Y

G

C

R

W2

W1

Y

G

C

R

**

* Connect either the O or the W1/B.In a typical O type reversing valve system, there will not be a connection to the W1/B terminal!

* Connect either the O or the W1/B.In a typical O type reversing valve system, there will not be a connection to the W1/B terminal!

W2/E

W1/B

SYSTEMSYSTEM

RH

RC

O

Y

G

RC/RHLINKRC/RHLINK

NCM300GAS/OILFurnace

1or2 STAGE

Y

C

OUTDOORCONDENSING

UNIT

G

Y1

W2

C

R

G

Y1

W2

C

R

W1W1

Note: All zone dampers default to the "OPEN"

position after a purge delay has occurred.

Dampers also default “OPEN” during

changeover & short cycle delays, and when

all zone demands are satisfied, and no

signals are detected from the thermostats.

Common 24vac

Constant 24vac HOT

24vac to Open a damper(s)

24vac to Close a damper(s)

Terminal M1

Terminal M2

Terminal M4

Terminal M6

ZONE MODULE DAMPER MOTOR TERMINAL BLOCK DESIGNATION & FUNCTION

.

.

2 Wire Spring Return Motor Wiring

EWC Controls Spring Return Motor Wiring

A Spring Open Damper is wired to M1 & M6A Spring Close Damper is wired to M1 & M4

M1

M2

M4

M6{

MA-ESR

NC NO C M M

AuxilarySPDTEnd SwitchDry ContactsRated for24vac only

M1

M2

M4

M6

ZONE MOTOR

REFERENCE THESE DIAGRAMS PRIOR TO INSTALLATION AND POWER WIRING. DOING SO WILL SAVE TIME AND LABOR LATER ON.

Patented Optical Damper Motor Actuators

Figure 4a

Figure 4c

Figure 5

All Models SMDL & BMDL Damper Wiring

24

1

M1

M2

M4

M6

ZONE MOTOR

All Models MA-ND & MA-URD Damper Wiring

46

1

Patented Optical Damper Motor Actuators

Figure 4b

M1

M2

M4

M6

ZONE MOTOR

On all these dampers and most older style dampers, including competitor’s dampers, always wire up number to number.Contact EWC Controls Technical Support when you are on the job site for assistance with damper wiring.

Do not overload your transformer!

Multiple MA-ND & MA-URD Damper Wiring on a Single Zone

46

1

M1

M2

M4

M6

ZONE MOTOR

46

14

61

Patented Optical Damper Motor Actuatorsor new Min/Max Actuators

Figure 6


Either oneNot both

DAMPER WIRING

SERVICE GUIDESome HelpfulGuidelines

Using the LEDIndicators

D e t e c t i n g 24VAC Short

I s o l a t i n g24VAC ShortsPanel or Wiring

Dampers NotRespondingProperly

HVAC SystemNot RespondingProperly

All voltage measurements on the panel

should be made with the ground lead

of your meter on terminal C of the

24VAC input terminals.

All VAC measurements at the HVAC

system terminals (W1/B, O, Y, W2/E &

G) should be made with the meter

ground lead on the system's C terminal

at the HVAC system.

The STATUS LED should blink at

1second on / 1 second off, to indicate

the microprocessor is operating

properly.

The SUPPLY AIR LIMIT LED will

illuminate if the panel senses a

discharge temperature in excess of the

high or low limit set points. The LED will

blink rapidly if the sensor is open or

shorted. The panel will function

normally but with no supply air

temperature control, until the open or

short is repaired.

The ZONE damper LED’s wil l

illuminate to indicate which dampers

should be open.

The W1/REV VALVE LED indicates that

the panel is in the 1st stage heating

mode.

The W2/EM LED indicates 2nd stage

heat or Emergency heat has been

energized.

The COMPRESSOR LED indicates the

compressor is energized.

The FAN LED indicates the fan is

energized.

The STATUS LED will be off, you will measure 24VAC at the transformer terminals R & C, but not at any damper M1&M2 terminals, or any zone thermostat R & C terminals. CAUTION: The thermal fuse will be very hot.

Remove the power to the panel and allow the thermal poly fuse to cool down.

Remove the wire at each zone thermostat R terminal and test if the short still persists by restoring power to the zone panel and testing as described above. If the short dis-appears, check the zone thermostat wiring and the thermostat itself. This applies if the thermostat requires the 24 volt (C)common, or the R wire could be shorted to ground.

If the Zone LED indicators are

illuminated but the dampers appear to

be malfunctioning, check the damper

field wiring.

If the ZONE LED’s are not responding

properly, check the calls on each zone

thermostat. If the calls indicate a

damper should be energized and is

not, press the TIMER RESET button to

reset the timers. If the problem

persists, see Table 2 for service help.

If the HVAC LED indicators are

responding properly, but the system

appears to be malfunctioning, check

that the HVAC system is wired correctly

and that the DIP switches have been

properly set.

If the HVAC LEDs are not responding

properly, check the calls on each zone

thermostat. If the calls indicate that the

HVAC system should be activated and

is not, press the TMR RESET switch to

reset the timers. Also check that the

DIP switches have been properly set. If

the problem persists, see Table 3 for

trouble shooting help.

6

Table 1. Detecting 24VAC Shorts

If the short still persists disconnect all the wires at each damper terminal (M1, M2, M4 & M6). Restore power and test as described above. If the short clears, check the damper wiring and the dampers for shorts with a continuity tester. If the short still persists, call the technical support hot-line.

Check 24VACPower

Measure 24VAC at all damper M1 and

M2 terminals and all T-stat R and C

terminals. See Table 1 if any of these

voltages are incorrect.


Damper LED OnBut Damper NotResponding

W1/B, O, Y, W2/E & G LEDS On But SystemNot Responding

LEDs and System Not Responding

MeasuringThermostatVoltages

NCM300Damper LED Not Responding

Testing DamperMotors

Check the damper wiring to insure it is correctly wired. Be sure the wires are secured in the terminals. Test the damper motor to insure it is properly operating. If the problem still persists, contact technical support.

Check the HVAC wiring to insure it is correctly wired. Be sure the wires are secured in the terminals. Check that there is 24VAC at the RC and RH terminals. Use the HVAC system common (C) for the ground lead of your meter. Check that RH and RC are connected if the system uses a single transformer.

For a gas/electric system test the HVAC by shorting terminals R and W1/B together to activate the heater, RC to Y to activate the compressor and RC to G to activate the fan. If the HVAC system has responded properly, call EWC technical support.

For a heat pump system test the heating by shorting terminals R to Y, W1/B and G. For a cooling test short R to Y, O and G.

Press the TMR RESET switch to clear the timers that may be preventing the call. The panel could be in minimum run time, short cycle delay, changeover delay or opposite system timing mode.

Check that the STATUS LED is blinking to insure the computer is operating properly, press the SYSTEM RESET switch if it is not.

Heat/Cool thermostats will apply 24VAC to the W1 terminal during a heating call. During a cooling call, 24VAC is applied to both Y and G.

During a continuous fan call, 24VAC is applied to the G terminal.

Be sure the RC and RH terminals at the thermostats are jumped together if your specific installation requires it.

If the system still does not respond, measure the voltage at each zone thermostat terminal W, Y, EM & G to insure they are correct and a call is in order.

Check that the STATUS LED is blinking. If it is not, the panel may have been placed in the Contractor Test inadvertently by holding the TMR RESET switch for 15 seconds. Press the CPU RESET switch to cancel the Contractor Test.

Press the TMR RESET switch to clear any timers that may be keeping the call off and the damper from not responding.

Check the voltage at each zone thermostat terminal W, Y and G terminals to insure the damper should be activated.

If the problem still persists, call the technical support hot-line.

For a RDN/SMDL/BMDL damper, connect 24VAC common to terminal 1, and 24VAC to terminals 2 and 4. The damper should open. Remove 24VAC from terminal 4 and the damper should close.

For a BMD/SMD/ND/URD damper, connect 24VAC common to terminal 1, and 24VAC to terminal 4 and the damper should open. Remove 24VAC from terminal 4 and apply 24VAC to terminal 6 and the damper should close.

For a power close spring open damper, connect 24VAC to the two motor terminals, and the damper should CLOSE. Remove the 24VAC and the damper should OPEN. For a power open damper, the action will be reversed.

EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362 E-Mail- [email protected] 7

Table 2. Detecting Damper Problems

Table 3. Detecting Heating, Cooling and Fan Problems

NCM-300

2

1

SUPPLYAIR

SENSOR

C

W

Y

R

G

ZONE 3T'STAT

ZONE 2T'STAT

M6

M4

M2

M1

ZONE 3MOTOR

M6

M4

M2

M1

ZONE 2MOTOR

M6

M4

M2

M1

ZONE 1MOTOR

R

C

24 VACT'FORMER

O

Y

G

W2/E

W1/B

RH

RC

SYSTEM

CONTROL SYSTEM

5

10

1520

25

30

352nd STAGE

TIMER

34

37

4043

46

49

52LOW TEMP

LIMIT

120

110

130140

150

160

170HIGH TEMP

LIMIT

R7

C8

F1

RC/RHLINK

R14

R26

K1

K2

K3

D3

D4

D5

R35

R44

R51

R56

K4

K5

K6

K7

D7

D8

D9

D10

D6

+

C1 D1 R4 R8

CPURESET

TIMERRESET

C4

D2

U1

U2

U3

C6 C7

R6

R5

R10

R9

R11

R13

R12

R18

R19

R23

R24

R25

R29

R30

C5Y1

C2

C3

R15

R17

R16

R21

R20

R22

R28

R27

R31

Z1

R36

OFF < > ONS

1

FAN DELAY OFF < > ONPURGE 60s < > 90sAUTO CHANGEOVER 2m< >5mSYSTEM HEAT PUMP< >GASFAN HYDRO < > GASOP SYS 0m< >20mSAS OFF < > ON NOT USED

R52

R53

R57

R45

C

W

Y

R

G

C

W

Y

R

G

EM

ONEZONE

ZONE 1T'STAT

CONTROLS INC.Englishtown, NJ

U4

U5

R34

R32

R33

R40

R39

R42

R43

R41

R46

R47

R49

R48

R50

R54

R55

R59

R58

R60

R61

R63

R62

R65

R38

R37

R

STATUSLED1

LED2

LED4

LED3

LED6

LED5

LED7

LED8

LED9

SUPPLY AIR LIMIT

ZONE 3 OPEN

ZONE 2 OPEN

ZONE 1 OPEN

W2 / EM

W1 / REV VALVE

COMPRESSOR

FAN

OFF < > ON

S1

FAN DELAY OFF < > ONPURGE 60s < > 90sAUTO CHANGEOVER 2m< >5mSYSTEM HEAT PUMP< >GASFAN ELEC < > GASOP SYS 0m< >20mSAS OFF < > ON NOT USED

8 EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362 E-Mail- [email protected]

Blow-up view of NCM-300 showing Factory Dip Switch settings.

RECORD YOUR OWN DIP SWITCHSETTINGS HERE

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W1146146

NCM300 Ver 1.2 Copyright EWC/ACI 2002 ALL rights reserved


ND

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146

NCM300 Ver 1.2 Copyright EWC/ACI 2002 ALL rights reserved

W

Y

R

G

EM

ONEZONE

ZONE 1T'STAT

GRYW1C

ZONE THERMOSTAT #1

C

Commercial GradeThermostat

UNOCC / OCC

SUPPLY AIR SENSOR OPERATIONS AND ONE ZONE FEATURE CONTROL

The One Zone feature allows the homeowner to

control all the zones from a single thermostat by using

an optional switch connected to the One Zone

terminals shown below. A homeowner can switch to

One Zone control when they leave for vacation or as a

night setback mode, and the Zone 1 thermostat will

control all zones. All zone dampers will respond to the

Zone 1thermostat.

One Zone can also be used in commercial

applications with a programmable thermostat in Zone

1 and non-programmable thermostats in all other

zones, thus satisfying the requirements of California

Title 24.

Substantial energy savings and equipment protection

can be obtained with proper use of the One Zone

feature and the supply air sensor.

A Supply Air Sensor can be used to limit supply air

temperatures and prevent over heating of the

equipment during the heating cycle or coil freeze-

up during cooling cycles. Wire the sensor as

shown below and set dip switch #7 to the ON

position. (See Page 2)

The Supply air sensor installs into the supply air

plenum or downstream of the evaporator coil or

heat exchanger and monitors the discharge air

temperature in heating and cooling modes. The

actual temperature is relayed backed to the

microprocessor. When the temperature exceeds

or falls below the HEAT or COOL limit set points,

the microprocessor will de-energize all HEAT or

COOL outputs for a minimum of 3 minutes. It also

energizes the FAN, if it is not already running, to

help dissipate the heat or warm up the evaporator

coil.

There is no differential built in to the sensor! Once

the supply air temperature rises or falls to a safe

value and, the 3 minute time delay has expired,

the microprocessor will restore the HEAT or

COOL outputs. The FAN will de-energize or stay

running, depending on the mode and the

application.

TM

Forced Air Zone Controls


110

120

130140

150

160

170

HEATING LIMIT34

37

4043

46

49

52COOLING LIMIT

Adjustable Heating & Cooling limit potentiometers

Supply air temperature sensor.

Model SAS

2

1

SUPPLYAIR

SENSORSENSOR

C

W

Y

R

G

EM

ONEZONE

ZONE 1T'STAT

EXTERNALONE ZONESWITCH

24V INDICATOR

One Zone switch.

(OPTIONAL)

One Zone Modevia the Zone 1Thermostat


AUTOMATIC CONTRACTOR TEST

The NCM300 has a built-in automatic sequencer that the contractor can initiate to test each zone damper, the HVAC system outputs and the LED indicators.

To start the contractor test, hold the timer Reset switch for 15 seconds and release.The Status LED blinks rapidly to indicate Contractor Test Mode.The panel checks whether Gas/Electric or Heat Pump type system was selected on dip switch #4.

The panel energizes the fan (G ) on, and opens the zone 1 damper. After 60 seconds the Zone 2 damper opens. After 60 seconds the Zone 3 damper opens.

After 60 seconds HEATING (W1/B)energizes. COMPRESSOR (Y) energizes also if Heat Pump mode was selected.

After 120 seconds HEATING (W2)energizes.

After 60 seconds HEATING (W1/B),(W2) and/or (Y) de-energize. FAN (G) continues to run.

After 120 seconds COOLING (O) energizes and COMPRESSOR (Y) energizes.

After 120 seconds COMPRESSOR (Y) de-energizes.

After 60 seconds FAN (G) de-energizes.

End of Contractor Test. The NCM300 resumes normal operation after step 8.

NOTE: Pressing the CPU Reset button at any time during the test, terminates the Contractor mode test and returns the NCM300 to normal operation.

Step 1.

Step 2.

Step 3.

Step 4.

Step 5.

Step 6.

Step 7.

Step 8.

NOTES:

model ncm 300 zone control system - ewcaux. ht. 4:31 pm 72 o fr fan autoon system cool off heat em....

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