_ Installation Instructions Single Package Heat Pumps I
Sequence of Operation
CoolingMode:Energized(R,G,O,Y1)
De-energized(N/A)
(a) When high and low voltage is initially applied
to unit:
(1) On a call for cooling ......... :
The compressor and condenser fan will have a delay
on and will energize after 3 minutes. The evaporator
blower motor will have a delay on and will energize
after 30 seconds. The delay on for the compressor
and the condenser fan can be by-passed by jumper-
ing the test pins on the defrost board control.
(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.
(b)Whenhighandlowvoltagehasbeenapplied
to unitfor morethan 3 minutes:
(1) On a call for cooling .........:
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 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.
HeatingMode:Energized(R,G,Y1)
De-energized(13)
(a) When high and low voltage is initially applied
to unit:
(1) On a call for heating ......... :
The compressor and condenser fan will have a delay
on and will energize after 3 minutes. The evaporator
blower motor will have a delay on and will energize
after 30 seconds. The delay on for the compressor
and the condenser fan can be by-passed by jumper-
ing the test pins on the defrost board control.
(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.
(b) When high and low voltage has been applied to
unit for more than 3 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 M ode:Energized (R,G,Y1) De-energized (13)
Defrost Sensor Closed
(1)
On a call for defrost .........
When the defrost sensor closes (this can be simu-
lated by jumpering across reset & common on the de-
frost board control) in the heating mode,there is a
30,60 or 90 minute defrost on delay before the de-
frost mode begins. This delay is determined by the
jumper connecting to T1,T2 or T3 on the defrost
board. This delay can be by-passed by jumpering
the test pins on the defrost board control (this re-
duces the delay from 30 minutes to 7 seconds, from
60 minutes to 14 seconds and from 90 minutes to 21
seconds). In the defrost mode the reversing valve
will energize and the condenser fan will de-energize.
(2) When defrost has been completed .........
This condition will be maintained until the defrost
sensor opens (this can be simulated by removing the
jumper across reset & common on the defrost board
control) or until the defrost mode operates for 10 min-
utes (or 2 seconds iftest pins are jumpered), which-
ever comes first.
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