5
2. Route the power supply and ground wires through the
high voltage entrance in the unit. Connect the power
supply wires to the contactor. Connect the ground wire
to the ground lug.
3. Route the low voltage wiring through the low voltage
entrance in the unit. Connect the low voltage wires to
the terminal strip.
4. If a proper room thermostat is not already present,
install one at a suitable indoor location.
Room thermostats:
-Must have one stage of cooling.
-Must continuously energize the “O” terminal when in
the “Cool” mode.
-Must not continuously energize the “O” terminal when
in the “Auto” (automatic changeover) mode.
-Should have two stages of heat.
-Should have adjustable heat anticipator(s). For proper
settings, see the blower coil or fossil fuel kit installa-
tion manual.
-Must automatically bypass compressor heat when in
the “Emergency Heat” mode.
Consult the instructions packaged with the thermostat for
mounting and location instructions. For field-supplied low
voltage wiring and connections, see the last section of this
manual.
5. IMPORTANT: Hard start components are required
when single-phase reciprocating compressors are
used with indoor coils which have thermal expansion
valves. Some units have hard start components fac-
tory installed. See the “Specifications” sheet for hard
start component requirements.
6. Check all factory wiring connections to ensure none
were loosened during shipping and handling.
System Startup
PRELIMINARY CHARGE ADJUSTMENT
IMPORTANT: See the wiring diagram or “Specifications”
sheet to determine if this unit has a crankcase heater. If it
does, you must connect electrical power to the unit for four
hours before operating the compressor. Failure to do so
could result in compressor damage.
IMPORTANT: During all installation and service work,
follow all regulations of the Environmental Protection
Agency. (This system uses R-22. R-22 is an HCFC [Hydro-
genated Chlorofluorocarbon].) Violation of EPA regula-
tions may result in fines or other penalties.
Use a male hexhead wrench to carefully open the suction
and liquid valves on the unit. These valves do not back
seat. OPEN EACH VALVE ONLY UNTIL IT TOUCHES
Electrical Connections
WARNING
To avoid personal injury, shock, or death,
open the electrical disconnect switch
before electrically connecting the unit.
Wiring must conform with NEC or CEC and
all local codes.
The wiring diagram for this unit can be found on the control
box cover. Refer to Figure 3 for field wiring connections.
HIGH VOLTAGE
CONNECTIONS
GROUND LUG
START RELAY
(if present)
LOW VOLTAGE
CONNECTIONS
LOW VOLTAGE ENTRANCE
HIGH VOLTAGE ENTRANCE
START
CAPACITOR
(if present)
E
O
W2
R
Y
C/X
Figure 3
WARNING
To avoid the risk of fire or equipment
damage, use only copper conductors.
WARNING
Consult the National Electrical Code or a
qualified electrician for proper wire size.
Undersized wires could cause poor
equipment performance, equipment
damage, or fire.
1. Local codes will usually require that a disconnect
switch be located near the unit. Do not locate the
disconnect switch on the unit itself.
WARNING
To avoid electrical shock, injury, or death,
wiring to the unit must be properly
grounded.
