ICM Controls ICM271 - Fan Control Center Manual

Also See for ICM271:

Installation, operation & application manual (2 pages)

Table of Contents

Contents

1 Replacement Description
2 ICM271 Component Layout
3 Specifications
4 Pre-Installation Instructions
5 Operational Differences
6 Blower Speed Output
7 Blower Operating Modes
8 Installation Instructions
9 Troubleshooting
10 Wiring Diagram
11 Documents / Resources
- 11.1 References
- 11.2 Download manual

ICM Controls ICM271 - Fan Control Center Manual

Replacement Description

The ICM271 Fan Control Center is a solid state control designed and engineered for the replacement market. The ICM271 is designed specifically to replace the Carrier/BDP Gas Furnace Control Centers that have been used in new equipment for many years. The ICM271 is a form, fit and functional replacement of the OEM control requiring no modifications to the original wiring or to the appliance's sheet metal.

The ICM271 is a form, fit and functional replacement of the OEM control for the following Carrier/BDP part numbers:

302075-3
CES0110017
CES0110018

HH84AA010
HH84AA011
HH84AA012

HH84AA013
HH84AA020
P771-7002

ICM271 Component Layout

Specifications

Input Voltage
- Terminals: PR-1, PR-2, L1 and L2: 120 VAC
- Terminals: SEC-1 and SEC-2: 18-30 VAC
Line Frequency: 60 Hz
Operating Temperature: .-40ºF to +176ºF
Maximum Operating Humidity: 95% R.H.
Non-condensing @ 50ºC
Time Delays
- Heat ON: 75 Seconds
- Heat OF: 105 Seconds
- Cool OFF: 90 Seconds

Pre-Installation Instructions

Turn off gas supply and electrical power to equipment before servicing

This device should be installed by a qualified technician with due regard for safety as improper installation could result in hazardous conditions.
Failure to carefully read and follow these instructions before servicing or operating this control, could result in personal injury, death and/or property damage.
Do not short out terminals on the gas valve or the ignition control module. A short or incorrect wiring will burn out the thermostat heat anticipator. It could also result in personal injury, death and/or property damage.

Operational Differences

The ICM271 has the same features and functions as the current Carrier/ BDP replacement (HH84AA020). The ICM271 has additional optional features and some slight operational differences than the older obsolete Carrier/BDP units. These options and operational differences are listed below.

warning Note: Some older Carrier models did not have a cooling fan relay.

On older Carrier/BDP models, the low-speed blower would still function if the 24 volt transformer malfunctions. This will not happen with the ICM271.
If the JW1 jumper is cut, a constant low-speed blower will occur without any thermostat signal. Also, a signal applied to the GC or Y terminals will not bring on the hi-speed blower during the cooling mode. Therefore, the JW1 jumper must not be cut on cooling applications.
The 24 volt circuit is fuse protected which is not true on earlier Carrier/BDP models. A 3 amp automotive type fuse is used to protect the thermostat and transformer circuits from shorts.
Note: On the ICM271, a blown fuse will cause the lo-speed blower to come on and remain on until the fuse has been replaced.
The ICM271 has an easy-to-remove vent damper jumper plug. This jumper plug is factory assembled for use on applications not having a vent damper. If the application has a vent damper, remove the jumper plug and connect the vent damper wiring harness connector to the ICM271 circuit board.

The GAS1-to-GAS3 connection is made by a three-wire flame-proof switch, but in some standing-pilot applications this device is not present. In such applications, a jumper must be installed between GAS1 and GAS3 terminals.

A jumper should only be used on applications where a jumper exists on the previous furnace fan control board. This jumper should also include a male 1/4" spade connector to connect to your current gas valve's wiring harness.

Blower Speed Output

Turn off gas supply and electrical power to equipment before servicing

Do not use this option on paired furnace applications.

The ICM271 has different blower speed options to match a specific application (see chart). The blower speed option used on the original furnace control may be very difficult to determine.

If the old Carrier/BDP unit has (2) black relays just like the ICM271, then look for the JW1 jumper and R17 resistor on the Carrier/BDP board. They will be in the same location as the JW1 and R17 on the ICM271. If either one (JW1 or R17) has been cut, then cut the ICM271 equivalent. This will match the original Carrier/BDP blower speed option.

Blower Operating Modes

Input From Thermostat	ICM271 As Shipped	G Blower Operation (Cut R17 Resistor)
W	Lo-Speed Heating Blower with 75 seconds ON Delay and 105 seconds OFF Delay
G	Hi-speed cooling blower	Lo-speed heating blower
Y	No blower	Hi-speed cooling blower with 90 second OFF delay

Installation Instructions

Be sure all electrical power is turned off.
Remove control box cover, exposing the old Carrier/BDP gas furnace control center.
If furnace is equipped with a vent damper, disconnect the plug connector from the old board.
Tag each wire as it is disconnected from the old furnace control center. Disconnect all of the wiring hookups.
Remove the old Carrier/BDP furnace control center from the control box.
Install the ICM271 fan control center into the control center box. Be sure the top edge of the ICM271 is in the mounting slot, just like the original board. Note: If the ICM271 is not installed correctly (i.e. behind the slot), an electrical short could occur.
Reconnect all of the wires (removed in Step 4, above) to the proper terminals.
If the appliance had a vent damper, break the vent damper jumper plug from the ICM271. Connect the original vent damper plug onto the ICM271.
Restore electrical power to the furnace and put the furnace into operation. Allow the furnace to run through one complete heating or cooling cycle.
If the furnace is functioning properly, replace all panels and leave this instruction sheet with the homeowner.

Troubleshooting

Troubleshooting to be performed by qualified technicians only. High voltage is dangerous – can cause injuries, death or property damage.

Symptom	Remedy
Low speed fan runs continuously	Verify you have 24 VAC between the R and C terminals Verify the high temperature limit switch is not open Check fuse to verify it is not blown Verify the fusible link is not damaged Temporarily bypass limits for troubleshooting only
No power to the thermostat (between R and terminals)	Verify you have 24 volts between the SEC-1 and SEC-2 terminals Verify that the high temperature limit switch is not open Check fuse to verify it is not blown Verify the fusible link is not damaged Make sure the door interlock is bypassed while troubleshooting
No fan output in cool mode	Verify that you have 24 volts between GC and C Check fan connections at HI and COM Verify high speed fan operates correctly
No fan output in heat mode	Check for 24Vac voltage from R-C Check Thermostat call for 24VAC from terminals W to C Check Connections of Gas 1 and Gas 3 Check for 24VAC from the Gas 1 terminal to C and from the Gas 3 terminal to C on the ICM271. If there is no voltage at either of these points, the fan will not work. Check for defective gas valve or loose /brokpen wires. VDP jumper plug broken off board. Check the Gas 1 – Gas 3 Jumper (on furnaces without flame proving circuit only) The GAS1-to-GAS3 connection is made by a three-wire flame-proof switch, but in some standing-pilot applications this device is not present. In such applications, a jumper must be installed between GAS1 and GAS3 terminals. A jumper should only be used on applications where a jumper exists on the original equipment furnace fan control board when no flame proving switch is installed. This jumper should also include a male 1/4" spade connector to connect to your current gas valve's wiring harness. Check fan connections at LO and COM Verify low speed fan operates correctly
Fan cycles on and off	Transformer may be damaged and creating an irregular sine wave Thermostat output signal may be outputting an irregular sine wave (especially solid state thermostats)

Wiring Diagram

Legend:

AUXLS	Auxiliary limit switch, manual reset (SPST- NC) (Down flow furnace models only)
BLWR	Blower motor relay (SPST-NO)
BVSS	Blocked vent shut-off switch, manual reset (SPST-NC)
CAP	Run capacitor
FL	Fusible link
HI/LO	Blower motor speed change relay (DPST)
ITLK	Blower door interlock switch (SPST-NO)
LS	Limit switch auto reset (SPST-NC)
MTR	Motor blower
TRANS	Transformer
VDP	Vent damper jumper plug
	Printed circuit board terminal
_______	24 VAC wiring
- - - - -	115 VAC wiring
	Circuit on printed circuit board
	Screw terminal
	Equipment ground
	Not on all furnace models