Page 60
4- After gas valve GV1 receives power, relay K29 is
energized. Contacts K29-1 open and time delay
DL6 resets.
5- If the gas valve does not receive power (indicat
ing a problem with the ignition control or the safe
ty circuits) before time delay DL6 finishes its 60
sec. count, time delay contacts close and red
NO HEAT" light is energized.
6- Other status panel lights are directly controlled
by the individual unit functions.
7- The COMPRESSOR" light depends on two
sources of voltage for green operation and one
source of voltage for red operation.
GCS16R Units:
The COMPRESSOR" light cannot be wired to
turn red. Each lead is connected to the low volt
age wire between the compressor contactor coil
and thermostat terminal Y1. The light will turn
green to indicate compressor operation during a
cooling demand.
GCS16 Units:
Each lead is connected electrically to either side
of the compressor's high pressure and loss of
charge switch. If the high pressure or loss of
charge switch should open, the green voltage
side of the COMPRESSOR" light would drop out
leaving only the red COMPRESSOR" light on.
b-To wire an SP11 to a GCS16
1- Disconnect power to the unit.
2- Make electrical connections as shown in fig
ure 79.
c-SSP11 Relay Kit
An SSP11 relay kit is required on units using an
electromechanical thermostat and an SSP11
switching status panel. The kit is used with the RRB
(readout relay kit) to interface the SSP11 to the ther
mostat. The SSP11 relay kit must not be used on
any other control system.
SSP11 Relay Kit Sequence of Operation:
1-The SSP11 relay kit contains two relays which af
fect unit operation.
2- Relay K20 energizes when the SSP11 is
switched to EM HEAT." Contacts K20-1 open to
deactivate the green HEAT" light. Simulta
neously, the control switch routes power back
ward through the HEAT" light. The HEAT" light
changes to red. Relay K20 has no other effect on
unit operation.
3- Relay K21 energizes when the SSP11 FAN"
switch is in the ON" position. Contacts K21-1
switch to allow the fan to run continuously.
d-To wire an SSP11 to a GCS16
1- Disconnect power to the unit.
2- Make electrical connections as shown in figures
80 and 81.
5-Filter Switch Kit
An air filter switch kit is available for use with the
SP11 and SSP11. The air filter switch is activated by
high negative pressure in the blower compartment
caused by dirty air filters or other restrictions. When
high negative pressure causes the switch to close,
power is routed from terminal strip terminal TB1-6
through the switch to the red FILTER" light in the
SP11 or SSP11. See figure 82.
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