(2) When the cooling setpoint has been satis-
fied ......... :
The compressor and condenser fan will de-energize
immediately. The evaporator blower motor will have a
delay off and will de-energize after 30 seconds.
Heating Mode: Energized (R,G,Y1)
De-energized (0)
(a) When high and low voltage is initially applied
to unit:
(1)
(2)
On a call for heating ......... :
The compressor and condenser fan will have a delay
on and will energize after 5 minutes. The evaporator
blower motor will have a delay on and will energize af-
ter 30 seconds. The delay on for the compressor and
the condenser fan can be by-passed by jumpering
the test pins on the defrost board control.
When the heating setpoint has been satis-
fied ......... :
The compressor and condenser fan will de-energize
immediately. The evaporator blower motor will have a
delay off and will de-energize after 30 seconds.
(b) When high and low voltage has been applied
to unit for more than 5 minutes
(1) On a call for heating ......... :
The compressor and condenser fan will energize im-
mediately. The evaporator blower motor will have a
delay on and will energize after 30 seconds.
(2) When the heating setpoint has been satis-
fied ......... :
The compressor and condenser fan will de-energize
immediately. The evaporator blower motor will have a
delay off and will de-energize after 30 seconds.
Defrost Mode:Energized (R,G, Y1) De-energized
(0) Defrost Sensor Closed
(1)
On a call for defrost .........
When the defrost sensor closes (this can be simu-
lated by placing a jumper across the DFST and
T'STAT terminals on the control board) in the heating
mode,there is a 30,60 or 90 minute defrost on delay
before the defrost mode begins. This delay is deter-
mined by the jumper selection on the control board.
See Figure 7.
(2) When defrost has been completed .........
This condition will be maintained until the defrost sen-
sor opens or for a mzximum of 10 minutes, whichever
comes first.
The TEST selection will speed up the defrost/heating cycle
for diagnostic purposes. When the jumper is in the TEST
position and Y is energized, the unit will cycle from heating
(10 seconds) to defrost (2 seconds) to heating (10 seconds)
to defrost (2 seconds) for a maximum of 8 times, tf the
jumper is left in the TEST position, the control will ignore the
call for TEST and default to a 90 minute defrost cycle. If the
jumper is not installed, the control will default to a 90 minute
defrost cycle.
NOTE: A jumper across the DFST and T'STAT terminals is
not necessary in order to check out the defrost control.
516 01110200
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