ICM Controls ICM271 Installation, Operation & Application Manual

ICM271
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
ICM271 Component Layout
Blower Relays
1
C10
C11
C12
EAC-2 EAC-1
C Y GC GH
1
C Y GC
Wall Thermostat
Terminal Block
Fan Control
Center
HH84AA010 HH84AA013
HH84AA011 HH84AA020
HH84AA012 P771-7002
1
R W
3 AMP
6
F1
GH R W
JW-1 ATO 3-amp Fuse
• 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.
• Time Delays
- Heat ON .................................................................................. 75 Seconds
- Heat OFF .............................................................................. 105 Seconds
- Cool OFF ................................................................................ 90 Seconds
• Turn off gas supply and electrical power to equipment before servicing
CAUTION!: This device should be installed by a qualified technician
CAUTION!: Failure to carefully read and follow these instructions
CAUTION!: Do not short out terminals on the gas valve or the
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.
Note: Some older Carrier models did not have a cooling fan relay.
1. 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.
2. 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.
3. 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.
4. The ICM271 has an easy-to-remove vent damper jumper plug. This
Blower
Option
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
Vent
Damper
switch, but in some standing-pilot applications this device is not present. In
Plug
Connection
such applications, a jumper must be installed between GAS1 and GAS3
terminals.
Vent
A jumper should only be used on applications where a jumper exists on the
Damper
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.
Specifications
Pre-Installation Instructions
with due regard for safety as improper installation could
result in hazardous conditions.
before servicing or operating this control, could result in
personal injury, death and/or property damage.
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
Non-condensing @ 50ºC
To
Gas
Valve