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506238−01 06/09
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.
Servicing Units Delivered Void of Charge
If the outdoor unit is void of refrigerant, clean the system
using the procedure described below.
1. Use nitrogen to pressurize the system and check for
leaks. Repair all leaks.
2. Evacuate the system to remove as much of the
moisture as possible.
3. Use nitrogen to break the vacuum and install a new
filter drier in the system.
4. Evacuate the system again. Then, weigh the
appropriate amount of HFC−410A refrigerant as listed
on unit nameplate into the system.
5. Monitor the system to determine the amount of
moisture remaining in the oil. It may be necessary to
replace the filter drier several times to achieve the
required dryness level.
If system dryness is not
verified, the compressor will fail in the future.
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).
WARNING
Electric Shock Hazard. Can cause
injury or death. Unit must be
grounded in accordance with national
and local codes.
Line voltage is present at all
components when unit is not in
operation on units with single-pole
contactors. Disconnect all remote
electric power supplies before
opening access panel. Unit may have
multiple power supplies.
Refer to the furnace or blower coil installation instructions
for additional wiring application diagrams and refer to unit
nameplate for minimum circuit ampacity and maximum
overcurrent protection size.
230VAC SUPPLY VOLTAGE
The XPG20 outdoor unit is rated for 230VAC applications
only.
24VAC TRANSFORMER
24VAC for the heat pump is provided by the indoor unit
transformer.
24VDC SOLAR CIRCUIT
This circuit is used for outdoor fan solar assisted operation.
See Figure 17 for specific connection and hardware
requirements for installation.
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.
1
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
DC SOLAR
DISCONNECT
SWITCH
TO INSTALLED SOLAR MODULE
WEATHER PROOF JUNCTION BOX
s
NOTE
24VAC, Class II circuit connections are made in the
control box.
2
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
