2-6
Table 2-1. Electrical Control Positions --- Above ---10
_
C (+14
_
F)
CONTROL CIRCUIT
COOLING
HOLDING
ZONE
* Dehumidifica-
tion
HEATING
DEFROST
Compressor Contactor (C)
Energized
De-energized
Energized
De-energized
De-energized
Condenser Fan Motor
Contactor (CF)
Energized
De-energized
Energized
De-energized
De-energized
One
Speed Evaporator
Motor Relay (EF)
Energized
Energized
Energized
Energized
De-energized
Two
Speed Evaporator
Motor Relay (EF)
Energized at set points above --10
_
C (14
_
F)
De-energized
Two
Speed Evaporator
Motor Relay (ES)
De-energized at set points above --10
_
C (14
_
F)
Defrost Relay (DR)
De-energized
De-energized
De-energized
De-energized
Energized
Heater Relay (HR)
De-energized
De-energized
Energized
Energized
Energized
Quench Solenoid (QV)
Refer to paragraph
1.13.4 Code 02
De-energized
Refer to paragraph
1.13.4 Code 02
De-energized
De-energized
INDICATING LIGHTS
Cool
ON
OFF
ON
OFF
OFF
Defrost
OFF
OFF
OFF
OFF
ON
In-Range
On -- If In-Range (Refer to paragraph 1.13.4, Code 29)
Heat
OFF
OFF
ON
ON
ON
POWER CIRCUIT
Compressor
Energized
De-energized
Energized
De-energized
De-energized
Condenser Fan Motor
Energized
De-energized
Energized
De-energized
De-energized
Heaters
De-energized
De-energized
Energized
Energized
Energized
Evaporator Fan Motors
Energized
Energized
Energized
Energized
De-energized
Table 2-2. Electrical Control Positions --- Below ---10
_
C (+14
_
F)
CONTROL CIRCUIT
COOLING
HOLDING
ZONE
**Dehumidifica-
tion
HEATING
DEFROST
Compressor Contactor (C)
Energized
De-energized
**
**
De-energized
Condenser Fan Motor Con-
tactor (CF)
Energized
De-energized
**
**
De-energized
One
Speed Evaporator
Motor Relay (EF)
Energized
Energized
**
**
De-energized
Two
Speed Evaporator
Motor Relay (EF)
De-energized at set points below --10
_
C (14
_
F)
Two
Speed Evaporator
Motor Relay (ES)
Energized at set points below --10
_
C (14
_
F)
De-energized
Defrost Relay (DR)
De-energized
De-energized
**
**
Energized
Heater Relay (HR)
De-energized
De-energized
**
**
Energized
Quench Solenoid (QV)
Refer to paragraph
1.13.4 Code 02
De-energized
**
**
De-energized
INDICATING LIGHTS
Cool
ON
OFF
**
**
OFF
Defrost
OFF
OFF
**
**
ON
In-Range
On -- If In-Range (Refer to paragraph 1.13.4, Code 29)
Heat
OFF
OFF
**
**
ON
POWER CIRCUIT
Compressor
Energized
De-energized
**
**
De-energized
Condenser Fan Motor
Energized
De-energized
**
**
De-energized
Heaters
De-energized
De-energized
**
**
Energized
Evaporator Fan Motors
Energized
Energized
**
**
De-energized
*
Unit with optional Humidistat (Refer to section 1.17)
** Dehumidification and heating modes do not operate at set points below --10
_
C (14
_
F)
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