Page 69
XII-COMMERCIAL CONTROLS
INSTALLATION OF PLUG-IN KITS
(Figure 92)
The commercial controls harness allows optional com
mercial controls and economizer to plug in to the GCS16
so field wiring is minimized. Figure 92 shows the commer
cial controls harness which is located in the GCS16 blower
compartment. GCS16H and GCS16R units are not
equipped with commercial controls harness.
J3/P3 J16/P16
P3
J3
J16
P16
UNIT JACKPLUGS
FIGURE 92
BLOWER
A-Night Kit
The night kit is used only with the C11 control system op
tion. It cannot be used with any other control system op
tions or control damage will result. This system is de
signed for use with optional CMC3-1 time clock and night
thermostat.
Optional night (setback relay) kit allows GCS16 units with
out economizer (REMD16 or EMDH16) to automatically
set back the thermostat to reduce energy consumption
during times when the building is not occupied. The night
kit achieves this by disconnecting thermostat S1 and con
necting a night thermostat during periods when the build
ing is not occupied. The night thermostat can then be ad
justed with a lower setpoint as needed for unoccupied
heating.
WARNING - CONNECT ONLY RELAY KITS DE
SIGNED FOR THIS CONTROL SYSTEM. RELAY
KITS DESIGNED FOR OTHER CONTROL SYS
TEMS ARE NOT COMPATIBLE AND CONTROL
DAMAGE OR FAILURE WILL RESULT. FOR EXAM
PLE, DO NOT CONNECT A WARMUP KIT TO THIS
CONTROL SYSTEM.
No wiring is required (see figure 93). Jumperplug P3 is re
moved and discarded. Night kit harness plug P4 connects
directly into economizer harness jack J3.
FIGURE 93
NIGHT KIT INSTALLATION
P4
J3
J16
P16
NIGHT RELAY
BLOWER
B-Night Relay
D5 (modulating) and D8 (threeposition) economizers re
quire a fieldinstalled night relay (same function as night
kit) when used with electromechanical thermostat or
W973 and night setback is required. The relay is a field
installed option which is hardwired to the economizer
(pigtails not supplied). The relay is field wired.
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