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TABLE 7
System Problem
Overcharge *
Undercharge
Liquid Line Restriction **
Low Evaporator Airflow
Dirty outdoor Coil
Low Outside Ambient temperature
TXV sensing bulb charge lost
Poorly Insulated Sensing Bulb
* Superheat "normal" values may range anywhere from ~6 to ~20 degrees.
** High ratio of Discharge Pressure to Suction Pressure
W RNING
TURN OFF ELECTRIC POWER AT
THE FUSE BOX OR SERVICE
PANEL BEFORE MAKING ANY
ELECTRICAL CONNECTIONS.
ALSO, THE GROUND CONNEC-
TION MUST BE COMPLETED
BEFORE MAKING LINE VOLTAGE
CONNECTIONS. FAILURE TO DO
SO CAN RESULT IN ELECTRICAL
SHOCK, SEVERE PERSONAL
INJURY OR DEATH.
Discharge Pressure
ELECTRIC L WIRING
Field wiring must comply with the National Electric Code (C.E.C. in Canada) and
any applicable local code.
POWER WIRING
It is important that proper electrical power from a commercial utility is available at
the condensing unit contactor. Voltage ranges for operation are shown in Table 8.
Power wiring must be run in a rain-tight conduit. Conduit must be run through the
connector panel below the access cover (see Figure 1) and attached to the bottom
of the control box.
Connect power wiring to control located in outdoor condensing unit electrical box.
(See wiring diagram attached to unit access panel.)
Check all electrical connections, including factory wiring within the unit and make
sure all connections are tight.
IMPORTANT: DO NOT connect aluminum field wire to the contactor terminals.
TABLE 8
VOLTAGE RANGES (60 HZ)
Nameplate Voltage
208/230 (1 Phase)
GROUNDING
A grounding lug is provided near the control for a ground wire.
CONTROL WIRING
(See Figure 2)
If the low voltage control wiring is run in conduit with the power supply, Class I insu-
lation is required. Class II insulation is required if run separate. Low voltage wiring
may be run through the insulated bushing provided in the 7/8 hole in the base
panel, up to and attached to the pigtails from the bottom of the control box. Conduit
can be run to the base panel if desired by removing the insulated bushing.
NOTE: Use No. 18 AWG solid copper wire at a minimum. If the wire length between
the thermostat and the unit is more than 100 ft., use 16 AWG solid copper wire to
avoid excessive voltage drop.
Suction
Pressure
Low/
High
Normal
Low
Low
Low
Low
High
Low
High/
High
Normal
Low
Low
Low
Low
High
High
Operating Voltage Range at Copeland
Maximum Load Design Conditions for
Sub-cooling Compressor Amps
High
High
Low
Low
High
Low
Low
Low
Low
High
High
Low
High
Low
Low
High
Compressors
187 - 253
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Troubleshooting
