For 208/230-V; Unit Controls; High-Pressure Relief Valve; Loss Of Charge Switch - Payne PA3Z Installation Manual

A. FOR 208/230-V BLOWER MOTORS
The motor lead speed connections are as follows:
SIZE
024
030
036
042
SIZE
048
060
PROCEDURE 5—UNIT CONTROLS
All compressors have the following internal-protection controls.
A. HIGH-PRESSURE RELIEF VALVE
This valve opens when the pressure differential between the low and high side becomes excessive.
B. LOSS OF CHARGE SWITCH
Located on the outdoor liquid line is a low-pressure switch which functions as a loss-of-charge switch. This switch contains a Schrader core
depressor. This switch opens at 7 psig and closes at 22 psig. No adjustment is necessary.
C. COMPRESSOR OVERLOAD
This overload interrupts power to the compressor when either the current or internal temperature become excessive, and automatically resets when
the internal temperature drops to a safe level. This overload may require up to 60 minutes (or longer) to reset; therefore, if the internal overload
is suspected of being open, disconnect the electrical power to the unit and check the circuit through the overload with an ohmmeter or continuity
tester.
PROCEDURE 6—SEQUENCE OF OPERATION
A. FAN OPERATION
The FAN switch on the thermostat controls indoor fan operation. When the FAN switch is placed in the ON position, the IFR (indoor-fan relay)
is energized through the G terminal on the thermostat. The normally-open contacts close, which then provide power to the indoor (evaporator) fan
motor (IFM). The IFM will run continuously when the FAN switch is set to ON.
When the FAN switch is set to AUTO, the thermostat deenergizes the IFR (provided there is not a call for cooling). The contacts open and the
IFM is deenergized. The IFM will be energized only when there is a call for cooling, in heat pump heating mode or if the unit is equipped with
accessory electric heat, the indoor-fan motor will also run while the accessory electric heat is energized.
NOTE: Some units are equipped with a time-delay relay. On these units, the indoor fan remains on for 30 seconds after G or Y is deenergized.
B. COOLING OPERATION (SIZES 024-042)
With a call for cooling (Y/Y2), the indoor fan energizes immediately whereas the contactor energizes after a 5 minute time delay (in case of initial
start-up) starting the compressor and the outdoor fan motor. When the cooling demand is met, Y/Y2 de-energizes, shutting the compressor, indoor
fan and the outdoor fan.
C
R
G
Y1
Y2
W2
W3
Thermostat
and subbase
Fig.10B—Control Connections (Sizes 048-060)
RATED AIRFLOW
Tap 1
Tap 2
Tap 1
Tap 2
RATED AIRFLOW
Low
Stage
Tap 1
Tap 1
—12—
BROWN
RED
GREEN
YELLOW
PINK
WHITE
VIOLET
Unit Control
Power
High Low
Stage Stage
Tap 3 Tap 2
Tap 3 Tap 2
HIGH AIRFLOW
Tap 3
Tap 4
Tap 3
Tap 4
HIGH AIRFLOW
High
Stage
Tap 4
Tap 4
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