Wiring Diagrams - Emerson White Rodgers 1F89-0211 Manual Del Usuario

WIRING DIAGRAMS

O/B
Changeover
Relay*
* Changeover Relay is energized in COOL when O/B switch is in the "O" position
Changeover Relay is energized in HEAT when O/B switch is in the "B" position
Figure 2. Typical wiring diagram for single transformer systems
NOTE
If safety circuits are in
only one of the systems,
remove the transformer
of the system with NO
safety circuits.
CUT AND
TAPE OFF!
HOT
120 VAC 24 VAC
NEUTRAL
* Changeover Relay is energized in COOL when O/B switch is in the "O" position
Changeover Relay is energized in HEAT when O/B switch is in the "B" position
Figure 3. Typical wiring diagram for two transformer systems with NO safety circuits
O/B Y G
Changeover Fan
Relay* Relay
Compressor
Contactor
COMMON
* Changeover Relay is energized in COOL when O/B switch is in the "O" position
Changeover Relay is energized in HEAT when O/B switch is in the "B" position
Figure 4. Typical wiring diagram for two transformer systems with safety circuits in BOTH systems
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Y G
Fan
Aux/Emergency
Compressor
Relay
Heat Relay
Contactor
(Stage 2)
O/B Y G
Changeover Fan
Relay* Relay
Compressor
Contactor
W2 C
SYSTEM
Optional
MONITOR
SWITCH
Aux/Emergency
Heat Relay
(Stage 2)
TWO COMMONS MUST
BE JUMPERED TOGETHER!
W2 C
SYSTEM
MONITOR
SWITCH
Optional
W2 C
Optional
Aux/Emergency
Heat Relay
(Stage 2)
TWO COMMONS MUST
BE JUMPERED TOGETHER!
Polarity must be observed. If the HOT side of the
second transformer is jumpered to the COMMON side
of the first transformer a short will be made. Damage
to equipment will occur when power is restored.
L R
Limit or
Safety
Switches
24 VAC
ACCESSORY
RELAY N.O.
CONTACT
COMMON
Limit or
Safety
Switches
24 VAC
Heat Pump Transformer
(Class II Current Limited)
3
THERMOSTAT
L
R
SYSTEM
Hot
24 VAC
120 VAC
Neutral
TRANSFORMER
(Class II Current Limited)
THERMOSTAT
L R
SYSTEM
SYSTEM
Limit or
MONITOR
Safety
SWITCH
Switches
24 VAC
TRANSFORMER
(Class II Current Limited)
NOTE
THERMOSTAT
SYSTEM
Limit or
Safety
Switches
24 VAC
120 VAC
NEUTRAL
Auxiliary
NOTE
Heating
Transformer
The accessory relay scheme
(Class II
is required
Current Limited)
circuits exist in both systems.
Limit or
Safety
HOT
Switches
120 VAC
NEUTRAL
Hot
120 VAC
Neutral
HOT
when safety