Page 21
XPG15 SERIES
IMPORTANT
Use a thermocouple or thermistor electronic vacuum
gauge that is calibrated in microns. Use an instrument
capable of accurately measuring down to 50 microns.
WARNING
Danger of Equipment Damage. Avoid deep vacuum
operation. Do not use compressors to evacuate a
system. Extremely low vacuums can cause internal
arcing and compressor failure. Damage caused by
deep vacuum operation will void warranty.
Evacuating the system of non−condensables is critical for
proper operation of the unit. Non−condensables are
defined as any gas that will not condense under
temperatures and pressures present during operation of
an air conditioning system. Non−condensables and water
suction combine with refrigerant to produce substances
that corrode copper piping and compressor parts.
Electrical
In the U.S.A., wiring must conform with current local codes
and the current National Electric Code (NEC). In Canada,
wiring must conform with current local codes and the current
Canadian Electrical Code (CEC).
Refer to the furnace installation instructions for additional
wiring application diagrams and refer to unit nameplate for
minimum circuit ampacity and maximum overcurrent
protection size.
24VAC TRANSFORMER
Use the transformer provided with the furnace or air
handler for low-voltage control power (24VAC − 40 VA
minimum)
SERVICE
DISCONNECT
SWITCH
MAIN FUSE BOX/
BREAKER PANEL
Refer to the unit nameplate for minimum circuit ampacity, and
maximum fuse or circuit breaker (HACR per NEC). Install power
wiring and properly sized disconnect switch.
NOTE Units are approved for use only with copper conductors.
Ground unit at disconnect switch or to an earth ground.
SIZE CIRCUIT AND INSTALL DISCONNECT
SWITCH
1
NOTE 24VAC, Class II circuit connections are made in the control
panel.
Install room thermostat (ordered separately) on an inside wall
approximately in the center of the conditioned area and 5 feet
(1.5m) from the floor. It should not be installed on an outside wall
or where it can be affected by sunlight or drafts.
THERMOSTAT
5 FEET
(1.5M)
INSTALL THERMOSTAT
2
Install low voltage wiring from outdoor to indoor unit and from thermostat
to indoor unit as illustrated.
FOR PROPER VOLTAGES, SELECT THERMOSTAT WIRE (CONTROL WIRES)
GAUGE PER TABLE BELOW.
WIRE RUN LENGTH
AWG# INSULATION TYPE
LESS THAN 100’ (30 METERS)
18 TEMPERATURE RATING
MORE THAN 100’ (30 METERS) 16 35ºC MINIMUM.
NOTE Wire tie provides low voltage wire strain relief
and to maintain separation of field installed low and
high voltage circuits.
A
Run 24VAC control wires through hole with grommet.
B
Make 24VAC thermostat wire connections.
NOTE Do not bundle any excess 24VAC control wires inside control box.
ROUTE THERMOSTAT WIRES
DEMAND DEFROST
CONTROL
CONTROL PANEL
HOLE
OUTDOOR UNIT
3
A
B
SEE PAGE 26 FOR SPECIFIC LOW VOLTAGE WIRING CONNECTIONS.
