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

10 

 

Stays at low CFM despite system call for cool or 
heat CFM 

 

Check low voltage (T’stat) wires and connections 

 

Verify fan is not in delay mode – wait until delay 
complete 

 

“R” missing/not connected at motor 

 

Perform motor/control replacement check 

 

Stays at high CFM 

 

“R” missing/not connected at motor 

 

Is fan in delay mode? – wait until delay time 
complete 

 

Perform motor/control replacement check 

 

Blower won’t shut off 

 

Current leakage from controls into G,Y or W?  
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

 

 
 

Summary of Contents for OL11-105FDBE

Page 1: ...DS 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 REFERRED TO IN THESE INSTRUCTIONS AS A QUALIFIE...

Page 2: ......

Page 3: ...I BLOWER CONTROL INFORMATION 1 A TERMINAL DEFINITIONS FIELD WIRING 1 B WIRING SWITCHES 2 C INPUTS 4 D OUTPUTS 4 E OPERATING MODES 5 F CFM TABLES 7 G ECM SPECIFIC REPLACEMENT PARTS 8 III ECM TROUBLESH...

Page 4: ...mostat 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 Sta...

Page 5: ...All installations and services must be performed by qualified service personnel 2 B WIRING SWITCHES OL11 OL16 LOWBOY Figure 1 BLOWER WIRING...

Page 6: ...lations and services must be performed by qualified service personnel 3 TURN OFF THE ELECTRICAL POWER to the furnace before attempting to disconnect blower wiring Figure 2 BOARD LAYOUT WITH SWITCHES B...

Page 7: ...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 8: ...their respective thermostat connections W Y G and DEHUM and operate whenever a call is present See Diagnostic Features for a function description of operation Motor CFM LED This green LED will flash...

Page 9: ...d low fire is activated for 15 minutes If a call for heat still exists high fire will be activated and will continue until the demand for heat has been satisfied Counterflow units in addition will run...

Page 10: ...es their tabular values are enacted when their function is called Three additional dip switches select 8 heating speeds which are enacted when heat is called This allows independent selection of heati...

Page 11: ...rness 350271 350271 Transformer 350464 350464 Power Choke 350855 COOLING SPEEDS HEATING SPEEDS TEMPERATURE RISE F Rise CFM COOL LOW DEHUM 3 ON 6 OFF 2 OFF 5 OFF 1 OFF 4 OFF 3 ON 6 OFF 2 OFF 5 OFF 1 ON...

Page 12: ...servicing motor Wait at least 5 minutes after disconnecting power before opening motor SYMPTOM CAUSE PROCEDURE Motor rocks slightly when starting This is normal start up for ECM Motor won t start No...

Page 13: ...moving 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 Ch...

Page 14: ...rain 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 Low static pressur...

Page 15: ...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 16: ...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 17: ...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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