Sequence Of Operation - Fujitsu FO2416RTJNAA Installation Instructions Manual

6.0 SEQUENCE OF OPERATION

6.1 Cooling Mode
When the 2-stage thermostat calls for the 1st stage
of cooling, the outdoor fan motor is energized and
motor is energized. The system then provides cooling
the thermostat calls for the 2nd stage of cooling, the
compressor shifts to the 2nd stage of capacity and
1st and 2nd stages as directed by the thermostat.
When the call for cooling has ended or the thermostat
and outdoor fan motor are de-energized, but the
seconds to extract the residual cooling capacity in the
cold indoor coil before it stops.
NOTE: 2 and 3 ton models feature a 2 speed ECM
1st stage cooling operation and high speed for 2nd
stage cooling operation. Standard single-speed PSC
motors are used on 4 and 5 ton models.
6.2 Heating Mode
When the heat pump thermostat is set to "heat" mode,
heating position. When the 2-stage thermostat calls
for the 1st stage of heating, the system then provides
heating for the conditioned space. If the thermostat
calls for the 2nd stage of heating, the compressor
es as directed by the thermostat. When the call for
heating has ended, the compressor and outdoor fan
continues to operate for 30 – 45 seconds to extract the
ing valve solenoid is de-energized. If the system is
and there is a call for heating.
NOTE: 2 and 3 ton models feature a 2 speed ECM
stage heating operation and high speed for 2nd stage
heating operation. Standard single-speed PSC mo-
tors are used on 4 and 5 ton models.
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6.3 Supplemental Electric
Heat in Heating Mode
If the building load should exceed the heating capacity
direct the air-handler to energize supplemental electric
heat as required to meet the building load as a 3rd
stage of heat. The compressor and outdoor fan
heaters and higher, the electric heater elements
are split into 2 stages controlled by energizing the
W1 and W2 thermostat pigtails on the air-handler
pigtails are connected together at the air-handler,
pump heating mode. If the 1st stage of electric heat
W2 thermostat pigtails on the air-handler should be
connected together to provide maximum supplemental
heat.
6.4 Dual Fuel Applications
– Heating Mode
If the building load should exceed the heat pump
heating capacity in extreme outdoor conditions, the
furnace. An outdoor ambient temperature can be set
in dual fuel enabled thermostats to direct the system
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thermostat is set to the EMERGENCY HEAT mode,
furnace.
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