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ECM OPERATION MANUAL
FOR USE WITH MODELS:
CHX1-75N CDX1-75N
CHX1-100N CDX1-100N
CHX1-125N CDX1-125N
: IF YOU DO NOT FOLLOW THE SAFETY PRECAUTIONS BELOW AND IN THIS MANUAL, A
FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL INJURY, OR LOSS OF
LIFE.
DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND LIQUIDS IN THE VICINITY OF
THIS OR ANY OTHER APPLIANCE.
WHAT TO DO IF YOU SMELL GAS:
• DO NOT TRY TO LIGHT ANY APPLIANCE.
• DO NOT TOUCH A
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All installations and services must be performed by qualified service personnel. INDEX SECTION BEGINNING PAGE I. FURNACE SPECIFICTIONS (SHIPPED SETTINGS) 1 II. BLOWER INFORMATION 3 A. WIRING 3 B. CFM TABLES 4 III. ECM TROUBLESHOOTING 6 A. GENERAL GUIDELINES TO TROUBLESHOOTING GE ECM 6 B. TROUBLESHOOTING CHARTS 9 i
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All installations and services must be performed by qualified service personnel. I. FURNACE SPECIFICATIONS (SHIPPED SETTINGS) CHX1 SERIES MODEL NO. CHX1-75 CHX1-100 CHX1-125 HEAT INPUT RATE IN BTU/HR (High fire/ Low fire) 75,000 / 52,000 100,000 / 70,000 125,000 / 87,500 HEATING CAPACITY IN BTU/HR (High fire/ Low fire) 70,875 / 49,612 94,500 / 66,150 117,500 / 82,250 HEIGHT OF CASING 44-1/4” 44-1/4” 44-1/4” WIDTH OF CASING 17” 21” 24” DEPTH OF CASING 27-1/2” 27-1/2” 27-1
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All installations and services must be performed by qualified service personnel. CDX1 SERIES MODEL NO. CDX1-75 CDX1-100 CDX1-125 HEATING INPUT RATE IN BTU/HR 75,000 / 56,250 100,000 / 75,000 125,000 / 93,750 (High fire / Low fire) HEATING CAPACITY IN BTU/HR (High fire / Low fire) 69,750 / 52,312 93,000 / 69,750 116,250 / 87,187 HEIGHT OF CASING 46-1/4” 46-1/4” 46-1/4” WIDTH OF CASING 17” 21” 24” DEPTH OF CASING 27-1/2” 27-1/2” 27-1/2” WARM AIR OUTLET 15 x 18 19 x 18 22 x 18
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All installations and services must be performed by qualified service personnel. II. BLOWER INFORMATION A. WIRING Figure 1: BLOWER WIRING : TURN OFF THE ELECTRICAL POWER to the furnace before attempting to disconnect blower wiring. 3
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All installations and services must be performed by qualified service personnel. B. 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 respective S3 and S4 dipswitches on the furnace’s integrated control board (see Figure 1). HEATING SPEEDS CDX1-75 CHX1-75 Dip Dip switch High Fire switch High Fire o o o o settings Low fire CFM Rise ( F) CFM Rise
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All installations and services must be performed by qualified service personnel. COOLING AND CONTINUOUS FAN SPEEDS CDX1-75 & CHX1-75 CDX1-100 & CHX1-100 CDX1-125 & CHX1-125 Dip Continuous Dip Continuous Dip Continuous switch fan switch fan switch fan setting CFM Cooling CFM setting CFM Cooling CFM setting CFM Cooling CFM 1-OFF 1-OFF 1-OFF 2-OFF 2-OFF 2-OFF 3-ON 3-ON 3-ON 4-OFF 500 1150 4-OFF 600 1380 4-OFF 700 1610 1-OFF 1-OFF 1-OFF 2-OFF 2-OFF 2-OFF 3-OFF 3-OF
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All installations and services must be performed by qualified service personnel. III. ECM TROUBLE SHOOTING A. GENERAL GUIDELINES TO TROUBLESHOOTING GE ECM – DRIVEN SYSTEMS : Disconnect power from unit before removing or replacing connectors, or 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 • Check power at motor • No movement •
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All installations and services must be performed by qualified service personnel. • “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 • Replace motor and perform Moisture Check moisture is present • Evidence of moisture present inside air mover • Perform Moisture Check DO DON’T • Check-out motor, controls, wiring and • Automaticall
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All installations and services must be performed by qualified service personnel. Figure 2: ECM PIN CONNECTORS Troubleshooting table above and Figure 2 adapted from GE Industrial Systems publication GED-7161C, “Troubleshooting GE ECM – Driven Systems”. 8
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All installations and services must be performed by qualified service personnel. B. TROUBLESHOOTING CHARTS THIS GUIDE SHOULD BE USED IN THE CASE OF A STOPPED OR MANFUNCTIONED ECM BLOWER MOTOR. THE FOLLOWING SHOULD HELP ESTABLISH THE TYPE OF MALFUNCTION OR DEVIATION FROM THE NORMAL BLOWER OPERATION. TO USE THIS DIAGRAM, YOU JUST NEED TO FOLLOW THE INSTRUCTIONS IN THE BOXES. CONFIRM IF EITHER BLOWER WHEEL IS RUBBING AGAINST NO DOES BLOWER SPIN FREELY? HOUSING OR MOTOR SHAFT IS SPINNING FREE
