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XP13 OPERATING SEQUENCE
This is the sequence of operation for XP13 series units. The
sequence is outlined by numbered steps which correspond
to circled numbers on the adjacent diagram.
NOTE− The thermostat used may be electromechan-
ical or electronic.
NOTE− Transformer in indoor unit supplies power (24 VAC)
to the thermostat and outdoor unit controls.
COOLING:
Indoor room thermostat wiring energizes terminal O by
cooling mode selection, energizing the reversing valve L1.
Cooling demand initiates at Y1 in the thermostat.
1 − 24VAC energizes compressor contactor K1.
2 − K1-1 N.O. closes, energizing compressor (B1) and out-
door fan motor (B4).
3 − Compressor (B1) and outdoor fan motor (B4)
begin immediate operation.
END OF COOLING DEMAND:
4 − Cooling demand is satisfied. Terminal Y1 is de-ener-
gized.
5 − Compressor contactor K1 is de-energized.
6 − K1-1 opens and compressor (B1) and outdoor fan
motor (B4) are de-energized and stop immediately.
Te
r
minal O is de−energized when indoor room thermo-
stat is out of cooling mode, de−energizing the reversing
valve L1.
Heating demand initiates at Y1 in the thermostat.
FIRST STAGE HEATING:
See steps 1, 2 and 3.
END OF HEATING DEMAND:
See steps 4, 5, and 6.
DEFROST MODE:
7 − When a defrost cycle is initiated, the control ener-
gizes the reversing valve solenoid and turns off the
condenser fan. The control will also put 24VAC on
the W1" (auxiliary heat) line. The unit will stay in this
mode until either the defrost thermostat (S6) tem-
perature is above the termination temperature of
70°, the defrost time of 14 minutes has been com-
pleted, or the room thermostat demand cycle has
been satisfied. If the room thermostat demand cycle
terminates the cycle, the defrost cycle will be held
until the next room thermostat demand cycle. If the
defrost thermostat (S6) temperature is still below the
termination temperature, the control will continue
the defrost cycle until the cycle is terminated in one
of the methods mentioned above.
