Carrier 48LC - Integrated Staging Control (ISC) Board; ISC Board - Sequence of Operation; General; Ventilation

26
Integrated Staging Control (ISC) Board
DDC
Control
Indoor Fan
“On” Status
IGC
Board
Power
Plug
Phase
Monitor
Relay
Auxilary
Shutdown
Condensate
Overflow
Economizer
Occupancy
Status Code LEDs
Thermostat
DDC
Control
Remote
Shutdown
Smoke
Shutdown
Smoke
Alarm
Low Ambient
Outdoor Fan
Control
Compressors
Reheat
Low Pressure
Switch
High Pressure
Switch
Indoor Fan
Motor
Outdoor Fan
Motors
Phase
Monitor
Relay
C13673
Fig. 40 -- Integrated Staging Control (ISC) Board
ISC Board -- Sequence of Operation
General —
The Carrier Integrated Staging Control (ISC) is intended
for use with a standard thermostat or direct digital control
(DDC) capable of three cooling stages. After initial power
to the board, a Green LED will blink with a 1 second duty
cycle indicating the unit is running properly. In the event
of the ISC board failing, the Green LED will be OFF or
continuously ON. When the unit is not running properly,
the Green LED will blink along with Red LED lights. The
Red LED light configuration will indicate the type of
error the board has identified. See Fig. 40 for LED
locations and Table 4 for a list of the status codes.
The ISC board can be remotely shutdown by removing
Jumper 4 and wiring to the Remote Shutdown terminal.
The Smoke Control Module can shutdown the unit by
removing Jumper 3 and wiring to the Smoke Shutdown
terminal. The Smoke Alarm terminal on the ISC Board
provides a pass thru connection should a smoke alarm
signal be connected. In the case of the RTU Open option,
the RTU Open controller provides the signal which is
passed thru the ISC board to the Smoke Alarm terminal.
The crankcase heater will run at all times except when the
compressors are running. An auxiliary power supply
(24Vac) available at TB--4 Terminal is provided to power
auxiliary equipment. An optional Phase Monitor Relay
can be wired to the PMR terminal by removing Jumper 5.
An optional Condensate Flow Switch can be wired to the
COFS Terminal by removing Jumper 7.
Ventilation —
In the Ventilation/Fan Mode (G on the thermostat), the
indoor--fan will run at low speed and the damper will
operate at minimum position.
48HC48LC