Installation Manual

7
IMPORTANT NOTE: Some single phase units are equipped with a
single-pole contactor. Exercise caution when servicing as only one
leg of the power supply is broken with the contractor.
To wire the unit, make the following high and low voltage connections.
HIGH VOLTAGE WIRING
• Single Phase- Two leads should be connected to terminals
L1 & L2 in the electrical control section, using wire sizes
specified in wiring table.
LOW V OLTAGE W IRING
• Air Conditioners- Connect 24V wires from the thermostat
to the corresponding wires in the control box using No. 18
AWG as follows:
LEAD THERMOSTAT
Red R (24V)
Green G (Fan)
Yellow Y (Cool)
White W1 (Heat)*
Brown W2 (Heat)*
Blue C (Common)
*Optional field installed heat connections
• Heat Pumps- Connect 24V wires from the thermostat to
the corresponding wires in the control box using No. 18
AWG as follows:
TERMINAL THERMOSTAT
Red R (24V)
Green G (Fan)
Orange O (Rev. Valve)
White W1 (Heat, 2nd)*
Brown W2 (Heat 3rd)*
Yellow Y (Cool)
Blue C (Common)
*Optional field installed heat connections
INTERNAL WIRING
A diagram detailing the internal wiring of this unit is located on the
electrical box cover. If any of the original wire supplied with the
appliance must be replaced, the wire gauge and insulation must
be the same as the original wiring.
Transformer is wired for 230 volts on the 208/230 models. See
wiring diagram for 208 volt wiring.
1. For branch circuit wiring (main power supply to unit
disconnect), the minimum wire size for the length of run
can be determined using the circuit ampacity found on the
unit rating plate and the table below. From the unit
disconnect to unit, the smallest wire size allowable may
be used for the ampacity, as the Disconnect must be in
sight of the unit.
BRANCH CIRCUIT AMPACITY
15 20 25 30 35 40 45 50
SUPPLY WIRE LENGTH -
FEET
200 64443322
150 86644433
100 108866644
50 141210108866
2. Wire size based on 60° C rated wire insulation and 30° C
Ambient Temperature (86° F).
3. For more than 3 conductors in a raceway or cable, see the
N.E.C. for derating the ampacity of each conductor.
STARTUP, ADJUSTMENTS, AND CHECKS
WARNING
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING
THIS UNIT.
MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE
TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR
DEATH.
START-UP P ROCEDURE AND C HECKLIST
With power turned off at all disconnects:
1. Turn thermostat system switch to “COOL” and fan switch
to “AUTO”. Next, turn the temperature setting as high as it
will go.
2. Inspect all registers and set them to the normal open
position.
3. Turn on the electrical supply at the disconnect.
4. Turn the fan switch to the “ON” position. The blower should
operate after a 7-second delay (10 seconds for models
with EEM motors).
5. Turn the fan switch to “AUTO” position. The blower should
stop after a 65-second delay (60 seconds for models with
EEM motors).
6. Slowly lower the cooling temperature until the unit starts.
The compressor, blower and fan should now be operating.
Allow the unit to run 10 minutes, make sure cool air is
being supplied by the unit.
7. Turn the temperature setting to the highest position,
stopping the unit. The indoor blower will continue to run
for 65-seconds (60 seconds for models with EEM motors).
8. Turn the thermostat system switch to “OFF” and disconnect
all power when servicing the unit.