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Integrated Staging Control (ISC)
SEQUENCE OF OPERATION
The Carrier Integrated Staging Control (ISC) is intended for use
with a standard thermostat, direct digital controls (DDC) capable
of three cooling stages, or the VAV-RTU Open controller (for
LC*B units). 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 proper-
ly, 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. 65 for LED locations and Table 3 for a list
of status codes.
DDC
Control
DDC
Control
Occupancy
Status Code LEDs
Thermostat
Indoor Fan
Economizer
"On" Status
Outdoor Fan
Motors
Fig. 65 — Integrated Staging Control (ISC) Board
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
through the ISC board to the Smoke Alarm terminal.
The crankcase heater will run at all times except when the com-
pressors 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.
IGC
Power
Phase
Phase
Auxilary
Board
Plug
Monitor
Monitor
Shutdown
Relay
Relay
Indoor Fan
Motor
44
Condensate
Overflow
Remote
Shutdown
Smoke
Shutdown
Smoke
Alarm
Low Ambient
Outdoor Fan
Control
Compressors
Reheat
Low-Pressure
Switch
High-Pressure
Switch
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