Specifications
Page 28
F-Optional Cold Weather Kit (Canada only)
Electric heater is available to automatically control the
minimum temperature in the gas burner compartment.
Heater is C.G.A. certified to allow cold weather operation
of unit down to 60°F (50°C ).
The kit includes the following parts:
1- Transformer (T20) is a 600V to 120/240V stepdown trans
former mounted in the blower compartment.
2- T20 has two in line fuses (F20), one on each leg of the
transformer. Both are rated at 15 amps.
3- The strip heater (HR6) is located as close as possible to the
gas valve. It is wired in series with T20. The strip heater is
rated at 500 Watts
4- A thermostat mounting box is installed on the vestibule of
the heating compartment. Included in the box are the fol
lowing thermostat switches:
a - Thermostat switch (S59) is an autoreset SPST
N.C. switch which opens on a temperature drop.
The switch is wired in series with 24v power and the
combustion air blower switch. When the tempera
ture drops below 20°F the switch opens and the
gas heat section is deenergized. The switch auto
matically resets when the heating compartment
temperature reaches 10°F.
b - Thermostat switch (S60) is an autoreset SPST
N.C. switch which opens on a temperature rise. The
switch is wired in series with HR6 and T20. When
the temperature rises above 20°F the switch opens
and the electric heater is deenergized. The switch
automatically resets when the heating compart
ment temperature reaches 10°F.
b - Thermostat switch (S61) is an autoreset SPST
N.O. switch which closes on a temperature drop.
The switch is wired in series with HR6 and T20.
When temperature drops below 20°F the switch
closes and electric heater is energized. The switch
automatically opens when heating compartment
temperature reaches 50°F.
G-Firestats S74 and S75
Some local codes require the installation of discharge air and
return air firestats to automatically shut down the unit when
excessive temperature is reached . Other local codes require
firestats wired to perform tasks such as energizing a blower or
closing dampers. These field provided firestats MUST be
mounted and wired per local codes or insuring agencies. If
manual reset controls are used, they MUST be accessible.
Smoke Detector wiring is shown on the unit wiring digrams in
back of this manual.
H-Cycle Control Kit (Figure 33)
Optional cycle control kit, when applied to GCS24 unit with
electromechanical thermostat, prevents frequent cycling
caused by thermostat diddling or thermostat bulb vibration.
The cycle controls require minimum on and minimum off
times before compressors can be energized or deenergized.
The cycle controls pluginto the J16/P16 jackplug located in
the unit filter section. No field wiring is required. The kit con
sists of two cycle control delays DL8 and DL9. Once installed,
DL8 prevents the first stage compressors from being ener
gized until the first stage thermostat bulb has been closed for
at least 30 seconds. First stage thermostat bulb must be open
for at least 240 seconds before first stage compressors can
be deenergized. DL9 prevents second stage compressors
from being energized until second stage thermostat bulb has
been closed for at least 60 seconds. Second stage thermostat
bulb must be open for at least 240 seconds before second
stage compressors can be deenergized.