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ECM OPERATION MANUAL
Model:
CSHB60-90XE
c WARNING:
• Do NOT store or use gasoline or other flammable vapors and liquids
in the vicinity of this or any other appliance.
• Improper installation, adjustment, alteration, service, or
maintenance can cause a fire or explosion resulting in property
damage, personal injury, or loss of life. For assistance or additional
information consult a qualified installer or service agency.
These instructions should be:
• read prior
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All installations and services must be performed by qualified service personnel. INDEX SECTION BEGINNING PAGE I. BLOWER CONTROLLER INFORMATION 1 A. TERMINAL DEFINITIONS & FIELD WIRING 1 B. WIRING & SWITCHES 2 C. INPUTS 3 D. OUTPUTS 4 E. OPERATING MODES 4 F. CFM TABLES 6 II. ECM TROUBLESHOOTING 7 A. DIAGNOSTIC FEATURES 7 B. GENERAL GUIDELINES TO TROUBLESHOOTING GE ECM 7 C. TROUBLESHOOTING CHARTS 1
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All installations and services must be performed by qualified service personnel. I. BLOWER CONTROLLER INFORMATION A. TERMINAL DEFINITIONS & FIELD WIRING Burner Harness Connector P1 Pin 1 – Limit switch connection. Pin 2 – 120 VAC Line connection. Pin 3 – Burner pilot contact. Pin 4&5 – 120 VAC Neutral connection. Pin 6 – Burner pilot contact. Pin 7&8 – From oil primary control. Pin 9 – Limit Switch Input (LSI). Field Wiring to Burner Pil
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All installations and services must be performed by qualified service personnel. B. WIRING & SWITCHES : TURN OFF THE ELECTRICAL POWER to the furnace before attempting to disconnect blower wiring. Figure 2: BOARD LAYOUT WITH SWITCHES 2
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All installations and services must be performed by qualified service personnel. C. Inputs Power supplies Line voltage is applied between the "S1" and "N1" quick connect terminals. 24 VAC Class II Transformer secondary voltage supplied to X and C Limit Switch The 120VAC limit switch is connected to pins P2-1 & 9. Refer to the Heat Mode section for the control operation. Thermostat call for heat "W" 24 VAC thermostat input. A call for heat is recognized when the thermostat conne
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All installations and services must be performed by qualified service personnel. EAC (electronic air cleaner) The control provides a 120VAC output for an electronic air Cleaner. This output is energized whenever the fan motor is energized (either low, heat or cool speed). Connection is made via male quick connect terminal labeled "EAC". Humidifier The control provides a 120 VAC output for a humidifier. Connections are made to a male quick connect terminal labeled "EAC". In this appli
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All installations and services must be performed by qualified service personnel. Heat Mode When a call for heat ("W") is received from the thermostat, if the “Cool” mode is not already active, the “T-T” terminal is energized and the blower on delay is started. The on-off pattern of DIP switch SW2 (positions 1 and 2) select one of four blower on delay values (see Table 1). When the delay time has elapsed, a speed value is read from DIP switch SW1 positions 1 through 3 (see the CFM Tables)
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All installations and services must be performed by qualified service personnel. 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 respective SW1 dipswitch on the furnace’s integrated control board (see Figure 2). CSHB60-90XE Heating Speed Set-ups Cooling Speed Set-ups Low Fire Med Fire High Fire Air Flow
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All installations and services must be performed by qualified service personnel. II. 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 provide a quick view into furnace performance without requiring a voltmeter. The green Input Status LEDs are driven by the “Y”, “W”, “G”, and “DEHUM” inputs and are located directly below those inputs. They will light to indicate the presence o
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All installations and services must be performed by qualified service personnel. • Verify fan is not in delay mode – wait until delay complete • “R” missing/not connected at motor • Stays at high CFM • “R” missing/not connected at motor • Is fan in delay mode? – wait until delay time complete • Blower won’t shut off • Current leakage from controls into G,Y or W? Excessive noise • Determine if it’s air noise, cabinet, duct or motor noise – interview customer, if necessary • Noisy b
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All installations and services must be performed by qualified service personnel. • Check and plug leaks in return ducts, cabinet Comfort Check • Check proper airflow settings • 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 Systems publication GED-7161C, “Troubleshooting GE ECM – Driven Systems”. C. TROUBLESHOOTING CHARTS 9
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All installations and services must be performed by qualified service personnel. 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 FREELY, REPAIR OR REPLACE AS
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All installations and services must be performed by qualified service personnel. Yes Sequence of Operation BLOWER Off- Delay Active? No Yes Yes Yes Yes HEAT On-Delay W LIMIT Mode On? Ended? Active? Active? No No No No 1.BURNER Off BURNER On 2. HEAT mode Off 3. BLOWER Off-Delay Started 4. Status LED Off Yes Yes Yes Yes COOL On-Delay DEHUM Y BLOWER Mode On? Ended? Active? Active? = LOW No No No No 1. A/C Off BLOWER = COOL 2. COOL mode Off 3.BLOWER Off-Delay Started 4.
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All installations and services must be performed by qualified service personnel. Sequence of Operation Glossary Inputs: LIMIT - 120vac power from the High Limit Switch used to power the burner. W- Switched 24vac indicating a Heat call from the thermostat. Y - Switched 24vac indicating a Cool call from the thermostat. G - Switched 24vac indicating a call for blower operation from the thermostat. DEHUM - Switched 24vac indicating a call for Dehumidification from a de-humidistat. BLOWE
