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I-Optional Cold Weather Kit
An electric heater is available to automatically con-
trol the minimum temperature in the gas burner com-
The kit includes the following parts:
1 - The strip heater (HR6) is located as close as
possible to the gas valve. The strip heater is rated
2 - A thermostat mounting box is installed on the wall of
the compressor compartment. Included in the box
are the following thermostat switches:
a.
which opens on a temperature drop. The switch is wired in
series with 24v power and the combustion air blower switch.
switch opens and the gas heat section is de-energized. The
switch automatically resets when the heating compartment
b. Thermostat switch (S60) is an auto-reset SPST N.C. switch
which opens on a temperature rise. The switch is wired in
energized. The switch automatically resets when the heating
c. Thermostat switch (S61) is an auto-reset SPST N.O. switch
which closes on a temperature drop. The switch is wired in
C) the switch closes and electric heater is energized. The
switch automatically opens when heating compartment
J-Smoke Detectors A171 and A172
-
stalled option. The smoke detectors can be installed in the
supply air duct (A172), return air section (A171), or in both
the supply duct and return air section.
K-Indoor Air Quality (CO2) Sensor A63
The indoor air quality sensor monitors CO2 levels and re-
ports the levels to the Unit Controller. The Unit Controller
adjusts the economizer dampers according to the CO2
levels. The sensor is mounted next to the indoor thermo-
stat or in the return air duct. Refer to the indoor air quality
sensor installation instructions for proper adjustment.
L-LP / Propane Kit
All units operated on LP/Propane require a natural to LP /
propane kit. The kit for single-stage units include one LP
stage kits include the same but has a prove switch used
stage units require (2) two-stage kits. For more detail refer
to the natural to LP gas changeover kit installation instruc-
tions.
M-Drain Pan Overow Switch S149 (optional)
when excessive condensate collects in the drain pan.
relays, located in the unit control panel. When the over-
Once the condensate level drops below the set level, the
will be energized.
N-Dirty Filter Switch S27
-
at 1” W.C. (248.6 Pa) The switch is mounted in the supply
air section on the evaporator coil seal.
O-Hot Gas Reheat
Hot gas reheat units provide a dehumidifying mode of op-
eration. These units contain a reheat coil adjacent to and
downstream of the evaporator coil. Reheat coil solenoid
valve, L14, routes hot discharge gas from the compressor
to the reheat coil. Return air pulled across the evaporator
L14 Reheat Coil Solenoid Valve
-
tion, L14 reheat valve is energized (Unit Controller P269-
3) and refrigerant is routed to the reheat coil.
Reheat Setpoint
Reheat is factory-set to energize when indoor relative
humidity rises above 60% (default). The reheat setpoint
can be adjusted by changing mobile service app Settings
- Control menu. A setting of 100% will operate reheat from
an energy management system digital output. The reheat
setpoint can also be adjusted using an optional Network
Control Panel (NCP).
Reheat will terminate when the indoor relative humidity
The reheat deadband can be adjusted at Settings - Con-
trol menu.
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