144
Table 96 — Staged Gas Control Board (SCB) Inputs and Outputs
Table 97 — Control Expansion Module (CEM) Inputs and Outputs
COMPRESSOR EXPANSION BOARD (CXB) — The
CXB is used to provide additional compressor outputs and
CSB inputs. See Table 98.
EXPANSION VALVE CONTROL BOARD (EXV) —
The EXV is used on all units to control the EXVs. The EXV
board is also used on Humidi-MiZer
®
equipped units to pro-
vide control of the condenser and bypass modulating valves.
See Table 99-101.
LOW VOLTAGE TERMINAL STRIP — This circuit board
provides a connection point between the major control boards
and a majority of the field-installed accessories. See Table 102.
The circuit breakers for the low voltage control transformers,
interface connection for the Carrier Comfort Network
®
(CCN)
communication, and interface connection for the Local
Equipment Network (LEN) communication are also located on
the low voltage terminal strip.
INTEGRATED GAS CONTROL (IGC) — One IGC is pro-
vided with each bank of gas heat exchangers. The quantity of
IGC boards will range from 2 to 5 depending on the size of the
unit and whether the unit is Low, Medium or High Heat. The
IGC controls the direct spark ignition system and monitors the
rollout switch, limit switches, and induced-draft motor Hall Ef-
fect switch.
For units equipped with Modulating Gas heat, the IGC in
the Modulating Gas section uses a Pressure Switch in place
of the Hall Effect sensor. The IGC is equipped with a LED
(light-emitting diode) for diagnostics. See Table 103.
POINT NAME POINT DESCRIPTION TYPE OF I/O I/O POINT NAME
CONTROL
BOARD
CONNECTOR
PIN NO.
INPUTS
LIMSWTMP Staged Gas Limit Sw.
Te m p
Thermistor / Transducer (0-5V) AN1 SCB J5, 1-3
LAT1SGAS Staged Gas LAT 1 Thermistor / Transducer (0-5V) AN2 SCB J5, 4-6
LAT2SGAS Staged Gas LAT 2 Thermistor / Transducer (0-5V) AN3 SCB J5, 7-9
LAT3SGAS Staged Gas LAT 3 Thermistor / Transducer (0-5V) AN4 SCB J5, 10-12
Not Used Not Used Thermistor / Transducer (0-5V) AN5 SCB J5, 13-15
LP_A
Circuit A Liquid Pressure
Transducer
Thermistor / Transducer (0-5V) AN6 SCB J6, 1-3
LP_B
Circuit B Liquid Pressure
Transducer
Thermistor / Transducer (0-5V) AN7 SCB J6, 4-6
Not Used Not Used Thermistor / Transducer (0-5V) AN8 SCB J6, 7-9
Not Used Not Used Thermistor AN9 SCB J7, 1-2
Not Used Not Used Thermistor AN10 SCB J7, 3-4
OUTPUTS
HTMG_CAP Modulating Gas Capacity 4-20mA AO1 SCB J8, 1-2
Not Used Not Used 4-20mA AO2 SCB J8, 3-4
HS3 Relay 3 W1 Gas Valve 2 Relay RLY1 SCB J9, 1-3
HS4 Relay 4 W2 Gas Valve 2 Relay RLY2 SCB J9, 4-6
HS5 Relay 5 W1 Gas Valve 3 Relay RLY3 SCB J9, 7-9
HS6 Relay 6 W2 Gas Valve 3 Relay RLY4 SCB J9, 10-12
HTRCRLY Heat Reclaim Relay Relay RLY5 SCB J9, 13-15
POINT NAME POINT DESCRIPTION TYPE OF I/O I/O POINT NAME CONTROL BOARD
CONNECTOR
PIN NO.
INPUTS
DHDISCIN Dehumidify Switch Input Switch DI1 CEM J7, 1-2
DMD_SW1 Demand Limit Switch 1 Switch DI2 CEM J7, 3-4
DMD_SW2 Demand Limit Switch 2 Switch DI3 CEM J7, 5-6
PRES Pressurized Input Switch DI4 CEM J7, 7-8
EVAC Evacuation Input Switch DI5 CEM J7, 9-10
PURG Smoke Purge Input Switch DI6 CEM J7, 11-12
IAQIN IAQ - Discrete Input Switch DI7 CEM J7, 13-14
MARH_MA MARH milliamps
Transducer (4-
20mA)
AN7 CEM J6, 1-3
OARH_MA OARH milliamps
Transducer (4-
20mA)
AN8 CEM J6, 4-6
SPRH_MA SPRH milliamps
Transducer (4-
20mA)
AN9 CEM J6, 7-9
RARH_MA RARH milliamps
Transducer (4-
20mA)
AN10 CEM J6, 10-12
DMDLMTMA 4-20 mA Demand Signal Thermistor AN1 CEM J5, 1-2
SASPRSET Supply Air Setpnt. Reset Thermistor AN2 CEM J5, 3-4
OAQ_MA,
SPRST_MA
OAQ milliamps, SP Reset milli-
amps
Thermistor AN3 CEM J5, 5-6
OACFM Outside Air CFM Thermistor AN4 CEM J5, 7-8
FLTS/FLT_PDT
Filter Status/Filter Pressure
Drop Transducer
Thermistor AN5 CEM J5, 9-10
PFLTS,
PFLT_PDT
Post Filter Status Input/Pres-
sure Drop Transducer
Thermistor AN6 CEM J5, 11-12
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