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All installations and services must be performed by qualified service personnel. 

15 

Check for Triac switched t’stat or solid state 
relay 

 

Excessive noise 

 

Determine if it’s air noise, cabinet, duct or motor 
noise – interview customer, if necessary 

 

Noisy blower or cabinet 

 

Check for loose blower housing, panels, etc. 

 

High static creating high blower speed? 

 

Check for air whistling thru seams in ducts, 
cabinets or panels 

 

Check for cabinet/duct deformation 

 

“Hunts” or “puffs” at high CFM (speed) 

 

Does removing panel or filter reduce “puffing”? 

 

Reduce restriction 

 

Reduce max airflow 

Evidence of Moisture 

 

 

Motor failure or malfunction has occurred and 
moisture is present 

 

Replace motor and perform 

Moisture Check

 

 

Evidence of moisture present inside air mover 

 

Perform 

Moisture Check

 

 

 
 

DO 

DON’T 

 

Check-out motor, controls, wiring and 
connections thoroughly before replacing motor 

 

Automatically assume the motor is bad.

 

 

Orient connectors down so water can’t get in

 

 

Install “drip loops”

 

 

Locate connectors above 7 and 4 o’clock 
positions

 

 

Use authorized motor and control model #’s for 
replacement

 

 

Replace one motor or control model # with 
another (unless an authorized replacement)

 

 

Keep static pressure to a minimum:

 

 

Recommend high efficiency, low static 
filters 

 

Recommend keeping filters clean 

 

Design ductwork for min static, max 
comfort 

 

Look for and recommend ductwork 
improvement, where necessary, in 
replacement 

 

Use high pressure drop filters – some have ½” 
H

2

O drop!

 

 

Use restricted returns

 

 

Size the equipment wisely

 

 

Oversize system then compensate with low 
airflow

 

 

Check orientation before inserting motor 
connectors

 

 

Plug in power connector backwards

 

 

Force plugs

 

 
 
Moisture Check 

 

Connectors are orientated “down” (or as recommended by equipment manufacturer) 

 

Arrange harnesses with “drip loop” under motor 

 

Is condensate drain plugged? 

 

Check for low airflow (too much latent capacity) 

 

Check for undercharged condition 

 

Check and plug leaks in return ducts, cabinet 

 

Comfort Check

 

 

Check proper airflow settings 

Summary of Contents for OC2-56DE

Page 1: ...GASOLINE OR OTHER FLAMMABLE VAPORS AND LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE INSTALLATION AND SERVICE MUST BE PERFORMED BY A QUALIFIED INSTALLER SERVICE AGENCY OR THE GAS SUPPLIER REF...

Page 2: ...SHIPPED SETTINGS 1 II BLOWER CONTROL INFORMATION 4 A TERMINAL DEFINITIONS FIELD WIRING 4 B WIRING SWITCHES 5 C INPUTS 9 D OUTPUTS 9 E OPERATING MODES 10 F CFM TABLES 12 G ECM SPECIFIC REPLACEMENT PAR...

Page 3: ...TION CFM 1000 1000 1000 3 SWITCH SELECTION CFM 1200 1200 1200 3 1 2 TON SWITCH SELECTION CFM 1400 1400 1400 HEATING HEATING HEATING 70deg SWITCH SELECTION CFM 737 1134 1335 APPROX TEMPERATURE RISE F 7...

Page 4: ...TION CFM 1000 1000 1000 924 3 SWITCH SELECTION CFM 1200 1200 1200 1276 3 1 2 TON SWITCH SELECTION CFM 1400 1400 1400 1474 4 TON 1600 HEATING HEATING HEATING HEATING 70deg SWITCH SELECTION CFM 737 1134...

Page 5: ...ION CFM 1200 1200 3 1 2 TON SWITCH SELECTION CFM 1400 1400 HEATING HEATING 70deg SWITCH SELECTION CFM 737 1134 APPROX TEMPERATURE RISE F 70 70 BLOWER MOTOR HP 1 2 1 2 NOZZLE SIZE 55 75 NOZZLE SPRAY AN...

Page 6: ...ostat call for heat R 24 VAC to thermostat G Thermostat call for fan Y Thermostat call for cool DEHUM Humidistat call for dehumidification TXV systems ONLY Thermostat Humidistat connections for 2 Stag...

Page 7: ...All installations and services must be performed by qualified service personnel 5 B WIRING SWITCHES HIGHBOY LOWBOY Figure 1 BLOWER WIRING...

Page 8: ...installations and services must be performed by qualified service personnel 6 TURN OFF THE ELECTRICAL POWER to the furnace before attempting to disconnect blower wiring COUNTERFLOW Figure 2 BLOWER WIR...

Page 9: ...tallations and services must be performed by qualified service personnel 7 TURN OFF THE ELECTRICAL POWER to the furnace before attempting to disconnect blower wiring OH5 85 DXE 2 STAGE Figure 3 BLOWER...

Page 10: ...lations and services must be performed by qualified service personnel 8 TURN OFF THE ELECTRICAL POWER to the furnace before attempting to disconnect blower wiring Figure 2 BOARD LAYOUT WITH SWITCHES B...

Page 11: ...oling is recognized when the thermostat connects Y to R This input has an indicator LED that will light when the control receives a call for cooling Refer to the Cool Mode section for the control oper...

Page 12: ...flash once for every 100CFM the blower is producing E Operating Modes Standby Mode All outputs are off and the control is waiting for a thermostat demand The thermostat inputs and limit switch are co...

Page 13: ...the burner is brought on They will continue at that speed until the delay time has elapsed The control remains in steady heat mode until the thermostat is satisfied When the call for heat signal is re...

Page 14: ...s F CFM TABLES The following tables contain blower speed settings and their respective air flowrates for the ECM blower motor To change air flowrates from that of the shipped settings use the respecti...

Page 15: ...r 350464 350464 350464 350464 350464 350464 III ECM TROUBLE SHOOTING A DIAGNOSTC FEATURES The control board is equipped with 4 green Input Status LEDs and 1 red Board Status LED These are intended to...

Page 16: ...motor for tight shaft Perform motor control replacement check Run Moisture Check Motor rocks but won t start Check for loose or compliant motor mount Make sure blower wheel is tight on shaft Perform...

Page 17: ...motor is bad Orient connectors down so water can t get in Install drip loops Locate connectors above 7 and 4 o clock positions Use authorized motor and control model s for replacement Replace one moto...

Page 18: ...ce personnel 16 Low static pressure for lowest noise Set low continuous fan CFM T stat in bad location Figure 3 ECM PIN CONNECTORS Troubleshooting table above and Figure 2 adapted from GE Industrial S...

Page 19: ...TO MOTOR IF CONNECTIONS ARE GOOD AND MOTOR STILL DOES NOT RUN REPLACE MOTOR THIS GUIDE SHOULD BE USED IN THE CASE OF A STOPPED OR MANFUNCTIONED ECM BLOWER MOTOR THE FOLLOWING SHOULD HELP ESTABLISH THE...

Page 20: ...Status LED Off 1 HEAT mode On 2 BLOWER HEAT 3 Status LED Flashes 1 COOL mode On 2 Blower On Delay Started 3 Condenser On 4 Status LED On continuous 1 FAN mode On 2 BLOWER LOW 3 Status LED On continuo...

Page 21: ...Fire Connect 2 Stage T stat to both W1 and W2 Single Stage T stat W2 Connect single stage T stat to W2 only BLOWER Speeds HEAT The Heating Blower speed selected by positions 1 2 3 of SW1 CFM tables o...

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