Carrier WeatherExpert 48N2 Controls, Start-Up, Operation, Service, And Troubleshooting page 155

POINT NAME POINT DESCRIPTION
INPUTS
LIMSWTMP Staged Gas Limit Sw. Temp
LAT1SGAS Staged Gas LAT 1
LAT2SGAS
Staged Gas LAT 2
LAT3SGAS
Staged Gas LAT 3
Not Used Not Used
LP_A Circuit A Liquid Pressure Transducer
LP_B Circuit B Liquid Pressure Transducer
Not Used Not Used
Not Used
Not Used
Not Used
Not Used
OUTPUTS
HTMG_CAP Modulating Gas Capacity
Not Used Not Used
HS3 Relay 3 W1 Gas Valve 2
HS4
Relay 4 W2 Gas Valve 2
HS5
Relay 5 W1 Gas Valve 3
HS6 Relay 6 W2 Gas Valve 3
POINT NAME
INPUTS
DHDISCIN
Dehumidify Switch Input
DMD_SW1 Demand Limit Switch 1
DMD_SW2 Demand Limit Switch 2
PRES Pressurized Input
EVAC Evacuation Input
PURG Smoke Purge Input
IAQIN
IAQ - Discrete Input
MARH_MA MARH milliamps
OARH_MA OARH milliamps
SPRH_MA SPRH milliamps
RARH_MA RARH milliamps
DMDLMTMA 4-20 mA Demand Signal
SASPRSET Supply Air Setpnt. Reset
OAQ_MA, SPRST_MA OAQ milliamps, SP Reset milliamps
OACFM Outside Air CFM
FLTS/FLT_PDT Filter Status/Filter Pressure Drop Transducer
PFLTS, PFLT_PDT Post Filter Status Input/Pressure Drop Transducer Thermistor
COMPRESSOR EXPANSION BOARD (CXB)
The CXB is used to provide additional compressor outputs and
CSB inputs. See Table 99.
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
vide control of the condenser and bypass modulating valves.
See Tables 100-102.
LOW VOLTAGE TERMINAL STRIP
This circuit board provides a connection point between the ma-
jor control boards and a majority of the field-installed accesso-
ries. See Table 103. The circuit breakers for the low voltage con-
trol transformers, interface connection for the Carrier Comfort
Table 97 — Staged Gas Control Board (SCB) Inputs and Outputs
Thermistor / Transducer (0-5V)
Thermistor / Transducer (0-5V)
Thermistor / Transducer (0-5V)
Thermistor / Transducer (0-5V)
Thermistor / Transducer (0-5V)
Thermistor / Transducer (0-5V)
Thermistor / Transducer (0-5V)
Thermistor / Transducer (0-5V)
Thermistor
Thermistor
4-20mA
4-20mA
Relay
Relay
Relay
Relay
Table 98 — Control Expansion Module (CEM) Inputs and Outputs
POINT DESCRIPTION
equipped units to pro-
®
TYPE OF I/O I/O POINT NAME
TYPE OF I/O I/O POINT NAME CONTROL BOARD CONNECTOR
Switch
Switch
Switch
Switch
Switch
Switch
Switch
Transducer
(4-20mA)
Transducer
(4-20mA)
Transducer
(4-20mA)
Transducer
(4-20mA)
Thermistor
Thermistor
Thermistor
Thermistor
Thermistor
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 provided 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 Effect 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 104.
155
CONTROL BOARD CONNECTOR
AN1 SCB
AN2 SCB
AN3 SCB
AN4 SCB
AN5 SCB
AN6 SCB
AN7 SCB
AN8 SCB
AN9 SCB
AN10 SCB
AO1 SCB
AO2 SCB
RLY1 SCB
RLY2 SCB
RLY3 SCB
RLY4 SCB
DI1 CEM
DI2 CEM
DI3 CEM
DI4 CEM
DI5 CEM
DI6 CEM
DI7 CEM
AN7 CEM
AN8 CEM
AN9 CEM
AN10 CEM
AN1 CEM
AN2 CEM
AN3 CEM
AN4 CEM
AN5 CEM
AN6 CEM
PIN NO.
J5, 1-3
J5, 4-6
J5, 7-9
J5, 10-12
J5, 13-15
J6, 1-3
J6, 4-6
J6, 7-9
J7, 1-2
J7, 3-4
J8, 1-2
J8, 3-4
J9, 1-3
J9, 4-6
J9, 7-9
J9, 10-12
PIN NO.
J7, 1-2
J7, 3-4
J7, 5-6
J7, 7-8
J7, 9-10
J7, 11-12
J7, 13-14
J6, 1-3
J6, 4-6
J6, 7-9
J6, 10-12
J5, 1-2
J5, 3-4
J5, 5-6
J5, 7-8
J5, 9-10
J5, 11-12