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NCM-300

SUPPLY

AIR

SENSOR

W/E

ZONE 3

T'STAT

W/E

ONE

ZONE

ZONE 1

T'STAT

ZONE 3

MOTOR

ZONE 2

MOTOR

ZONE 1

MOTOR

24 VAC

T'FORMER

W2/E

W1/B

SYSTEM

CONTROL SYSTEM

OFF

STAGING

W2 TIMER

LOW TEMP

LIMIT

120

110

130

140

150

160

170

HIGH TEMP

LIMIT

CONTROLS INC.

Englishtown, NJ

RC/RH

LINK

R14

R26

R35

R44

R51

R56

D10

C3 D1 R4 R8

RESET

R10

R70

R69

R13

R19

R23

R24

R25

R29

R30

R34

R32

R33

R40

R39

R42

R43

R41

R44

R47

R49

R48

R54

R55

R54

R55

R50

R61

R63

R62

R65

R38

R37

R52

R53

R57

R45

R28

R17

R16

R21

R20

R22

R27

R317

R66

R36

OFF < > ON

HP < SYSTEM > GAS

HC < TSTATS > HP

OFF < PURGE ASST > ON

90 < PURGE > 120 S

0 < FAN DLY > 45 S

O < RV > B

OFF < SAS > ON

GAS < FAN > HYDRO

STATUS

LED1

LED2

LED4

LED3

LED6

LED5

LED7

LED8

LED9

SUPPLY AIR LIMIT

ZONE 3 OPEN

ZONE 2 OPEN

ZONE 1 OPEN

W2 / E

W1 / B

COMPRESSOR

FAN

NCM300 Ver 2.3

O/B

W/E

ZONE 2

T'STAT

O/B

The New NCM300 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 thermostat. With features like

Automatic changeover, Timed or Thermostatic staging,

Field selectable Features and Supply air Sensing capability,

the NCM300 provides the highest level of performance and

versatility in a non-expandable zone control panel. Perfect

for new construction and retro-fit applications.

Will control 1 stage Heat Pumps with

Electric auxiliary heat. Will also control

1 & 2 stage Gas or Oil furnaces. Also

Straight Electric furnaces or Hydronic

Heat with 1stage air conditioning.

The NCM300 panel features automatic

changeover from any thermostat

allowing for individual zone comfort

from the zoned 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.

INPUT VOLTAGE: 19-30VAC 60 Hz

Transformer 40-60VA MAX. NEC Class 2.

CURRENT DRAW: Max 14VA @ 24VAC.

OVER-CURRENT PROTECTION: 2.5

amp or 60VA.

The NCM300 has a 2.5amp thermal circuit

breaker in place of a fuse that protects the

NCM300 from shorted circuits in the

thermostat and damper field wiring. It will

not protect against shorts in the HVAC

system wiring. DO NOT exceed a 60va

transformer to power the panel.

NOTE: When the circuit breaker is tripped it will

get hot and all of the panel LED’s will stop

functioning. To reset the breaker, locate the

short by removing all wires connected to the

panel, one at a time. When the shorted wire is

removed the panel will resume normal

operation. Now you must repair or replace the

shorted wire before you re-connect it.

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 active or

pending heat or cool demands.

Zone Capacity

Compatible

HVAC Systems

Compatible

Thermostats

Automatic

Heat/Cool

Changeover

Status LED

Figure 1. NCM300 panel

System LEDs

Damper LEDs

Operating

Power

Thermal

Breaker

Operating

Conditions

Indoor Fan

Control

EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362 E-Mail- info@ewccontrols.com

TECHNICAL BULLETIN

Model NCM300 Zone Control System

TB-226

LEAVE THIS BULLETIN ON THE JOB SITE FOR FUTURE REFERENCE

The NCM300 is compatible with

most single stage Heat/Cool type

Thermostats. Two stage Heat Pump

Thermostats can be used if staging

by temperature is desired. Hard

Wired, Power Robbing or Battery

Powered type thermostat models

can be used.

Controls two or three air zones with

24vac Power Open/Close or Spring

Assisted motorized dampers.

TEMPERATURE: -20° to 160°F (-29° to

71°C)

HUMIDITY: 0% - 95% RH Non-Condensing.

Summary of content (12 pages)

PAGE 1
TECHNICAL BULLETIN Model NCM300 Zone Control System TB-226 LEAVE THIS BULLETIN ON THE JOB SITE FOR FUTURE REFERENCE Compatible HVAC Systems Compatible Thermostats Automatic Heat/Cool Changeover Controls two or three air zones with 24vac Power Open/Close or Spring Assisted motorized dampers. Will control 1 stage Heat Pumps with Electric auxiliary heat. Will also control 1 & 2 stage Gas or Oil furnaces. Also Straight Electric furnaces or Hydronic Heat with 1stage air conditioning.
PAGE 2
Built-In Timer Settings The panel has built-in timers that insure safe HVAC system operations. *Start-up Delay Timer 4 minutes, fixed. *Minimum Run Timer 2 minutes, fixed. *Short Cycle Timer 2 minutes, fixed. *Changeover Timer 4 minutes, fixed. . minutes, fixed. *Opposing System 20 Service Timer *Second Stage Off or 7 to 42 Heating Timer minutes, adjustable. TIMER DEFINITIONS Start-Up Delay Timer Upon initial power up or after a power failure, the panel will not start the equipment for 4 minutes.
PAGE 3
WIRING INSTRUCTIONS WARNING: THESE PANELS ARE DESIGNED FOR USE WITH 24VAC. DO NOT USE OTHER VOLTAGES! USE CAUTION TO AVOID ELECTRIC SHOCK OR EQUIPMENT DAMAGE. ALL WORK SHOULD BE PERFORMED TO LOCAL AND NATIONAL CODES AND ORDINANCES. USE 18 AWG SOLID COPPER, COLOR-CODED, MULTI-CONDUCTOR THERMOSTAT CABLE. 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.
PAGE 4
System Wiring Typical heat pump system wiring with electric The NCM300 panel was designed to be easy to understand and wire up. We have provided several typical field wiring diagrams to review. Your actual field wiring may vary. Notice that you may now connect the 24vac “C” common terminal from the HVAC system to the NCM300 “system” terminal block. This provides a convenient place to reference the HVAC system 24vac common wire and helps to simplify the troubleshooting process.
PAGE 5
DAMPER WIRING 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. 2 Wire Spring Return Motor Wiring EWC Controls Spring Return Motor Wiring MA-ESR REFERENCE THESE DIAGRAMS PRIOR TO INSTALLATION AND POWER WIRING. DOING SO WILL SAVE TIME AND LABOR LATER ON.
PAGE 6
SERVICE GUIDE Some Helpful Guidelines Using the LED Indicators All voltage measurements on the NCM300 panel should be made with the ground lead of your meter on terminal “C” of the 24VAC input terminals. Check 24VAC Power 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.
PAGE 7
Table 2. Detecting Damper Problems Damper LED On But Damper Not Responding 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. NCM300 Damper LED Not Responding Check that the STATUS LED is blinking. If it is not, the panel may be in a shutdown mode due to a short in the field wiring. See Table 1. Detecting 24vac shorts.
PAGE 8
ZONE 3 MOTOR M6 M4 M2 M1 14 21 28 7 40 35 OFF 42 STAGING W2 TIMER 34 LOW TEMP LIMIT 110 170 HIGH TEMP LIMIT C9 C1 R27 R317 R66 Z1 C2 F1 D6 R36 OFF < > ON R K4 D7 C R44 R53 K6 D9 R57 R56 K7 D10 C W/E O/B Y R G R23 C7 R24 R25 R29 U4 R30 R34 R32 ZONE 2 T'STAT C W/E O/B Y R G R33 C6 R40 R39 R42 R43 R41 U5 R44 R47 R49 R45 R52 R51 ZONE 3 T'STAT R19 U6 K5 D8 RC/RH LINK R13 U3 R38 R37 SYSTEM W2/E W1/B O Y G RH RC C R69 HP < SYSTEM > GAS HC < TSTATS > HP OFF < PURGE A
PAGE 9
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362 Y1 Y1 E-Mail- info@ewccontrols.
PAGE 10
Damper Y R C O EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362 C C E-Mail- info@ewccontrols.
PAGE 11
TM Forced Air Zone Controls SUPPLY AIR SENSOR OPERATIONS AND ONE ZONE FEATURE CONTROL 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 freezeup during cooling cycles. Wire the sensor as shown below and set dip switch #7 to the ON position.
PAGE 12
Congratulations on purchasing and successfully installing your new NCM300 Zone Control system. The NCM300 is certainly easy to setup and install. But should you find the need for a little assistance, remember that you can call our toll free technical support hotline when you are on the job site! @ 800-446-3110. Please have a multi-meter, pocket screwdriver and wire cutters handy. If you just have some questions about the NCM300 or any other Ultra-Zone product, call us at 732-446-3110.