8
• Single stage or two-stage heating thermostats can be used with
this equipment depending on optional accessories installed
with the unit. Select a thermostat that operates in conjunction
with the installed accessories.
• The thermostat should be mounted about 5 feet above the
floor on an inside wall. DO NOT install the thermostat on an
outside wall or any other location where its operation may be
adversely affected by radiant heat from fireplaces, sunlight,
lighting fixtures or convective heat from warm air registers or
electrical appliances. Refer to the thermostat manufacturer’s
instruction sheet for detailed mounting information.
Cooling Only Thermostat
Connect the
red & yellow wires from the unit to the R & Y
terminals on the thermostat subbase. Connect the
green wire
to the
yellow wire at the unit. See
.
Heat / Cool Thermostat
For the highest efficiency, the use of a 2-stage Heating/Cooling
thermostat is recommended. The heat/cool thermostat prevents
simultaneous operation of the heating and cooling units and is
equipped with an ON-AUTO fan mode that allows the home owner
to operate the indoor blower when only air circulation is desired.
Connect the red, yellow, green and brown/orange low voltage
wires to the
R or RC, Y, G, W or W2 (if applicable) terminals
on the thermostat base. The black wire is the 24 volt common
required on some thermostats. See
.
Blower Speed - ECM Motor
WARNING:
To avoid electric shock, personal injury, or death,
turn off the electric power at the disconnect or the
main service panel before making any electrical
connections.
CAUTION:
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. Verify proper
operation after servicing.
CAUTION:
To avoid personal injury or property damage,
make certain that the motor leads cannot come
into contact with any metal components of the
unit.
For optimum system performance and comfort, it may be
necessary to change the factory speed setting.
1. Disconnect all electrical power to the unit and remove the
service panel.
2. Locate the orange and red wires terminated to the blower
motor.
NOTE: The orange wire controls cooling operation
and the red wire controls the heating operation.
3. Verify the required speed from the airflow data found in
. Place appropriate wire on the appropriate
motor speed tap for the required airflow.
4. Check all factory wiring as shown in the wiring diagram and
inspect the connections to make sure none of them loosened
during shipping or installation.
START UP & ADJUSTMENTS
Pre-Start Checklist
The following check list should be observed prior to starting
the unit.
√
Verify the unit is level and allows proper condensate drainage.
√
Verify the outdoor coil and top of the unit are free from
obstructions and debris, and all equipment access/control
panels are in place. Unit must be installed with the proper
clearances shown in
.
√
Verify that the duct work is sealed to prevent air leakage.
√
Verify that the line voltage power leads are securely connected
and the unit is properly grounded. Check the condenser fan
to make sure it turns freely.
√
Verify the thermostat is wired correctly and installed in a
proper location. Make sure the low voltage wires are securely
connected to the correct leads on the low voltage terminal
strip.
√
Verify that the power supply branch circuit overcurrent
protection is sized properly.
√
To achieve rated capacity and efficiency the compressor must
be exposed to refrigerant for at least 24 hours prior to running.
After unit startup, the compressor must run for a minimum of
12 hours.
Start-Up Procedure
CAUTION:
If the unit is equipped with a crankcase heater,
allow 24 hours prior to continuing the start up
procedures to allow for heating of the refrigerant
compressor crankcase. Failure to comply may
result in damage and could cause premature
failure of the system. This warning should be
followed at initial start up and any time the power
has been removed for 12 hours or longer.
NOTE: The control circuit thermostat may consist of an anti-
short cycle timer that will not let the compressor re-start before
3 - 5 minutes have elapsed.
1. Set the system mode to OFF and the temperature mode to
its highest setting.
2. Turn power on at the disconnect switch.
Figure 8. Low Voltage Connections
RED
R
YELLOW
Y
GREEN
G
BROWN
*
W1
ORANGE
RED
R
YELLOW
Y
GREEN
G
BROWN
*
W
ORANGE
4 WIRE HEAT/COOL THERMOSTAT
Two Stage Heating T-Stat
Single Stage Electric Heat
RED
R
YELLOW
Y
GREEN
2 WIRE COOLING
(ONLY) THERMOSTAT
CONTROL WIRE LEGEND:
GREEN - Blower Relay
RED - Transformer (24V)
YELLOW - Cooling 1st Stage
BROWN - Heating 1st Stage
ORANGE - Heating 2nd Stage
*
W2
*Connected when Optional Electric Heating Kit is Installed.
