Mounting And Wiring - ClimateMaster ATP21W02 Installation Instructions Manual

T H E S M A R T S O L U T I O N F O R E N E R G Y E F F I C I E N C Y
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MOUNTING AND WIRING

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Changeover
* Changeover Relay is energized in COOL when O/B switch is in the "O" position
** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency
CUT AND
TAPE OFF!
HOT
120 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
** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency
Figure 3. Typical wiring diagram for two transformer systems with NO safety circuits
O/B Y
Changeover
Relay*
Compressor
Contactor
* 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
** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency
Figure 4. Typical wiring diagram for two transformer systems with safety circuits in BOTH systems
O/B Y G
Fan
Relay*
Compressor
Relay
Contactor
Changeover Relay is energized in HEAT when O/B switch is in the "B" position
Figure 2. Typical wiring diagram for single transformer systems
If safety circuits are in only one of the systems, remove
the transformer of the system with NO safety circuits.
O/B Y G
Changeover Fan
Relay* Relay
24 VAC
Compressor
Contactor
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.
G W2 E
See Note **
Fan
Emergency
Relay Relay
Aux
Relay
(Stage 2)
TWO COMMONS MUST
BE JUMPERED TOGETHER!
c l i m a t e m a s t e r . c o m
W2 E C
See Note ** SYSTEM
MONITOR
Emergency
SWITCH
Aux
Relay
Relay
(Stage 2)
NOTE
W2 E C
See Note ** SYSTEM
MONITOR
Emergency
SWITCH
Relay
Aux
Relay
(Stage 2)
TWO COMMONS MUST
BE JUMPERED TOGETHER!
NOTE
C L R
Limit or
Safety
Switches
SYSTEM
MONITOR
SWITCH
24 VAC
ACCESSORY
RELAY N.O.
CONTACT
COMMON
Limit or
Safety
Switches
24 VAC
COMMON
Heat Pump Transformer
ATP21W02
C r e a t e d : 2 1 N o v e m b e r, 2 0 1 4
THERMOSTAT
L R
SYSTEM
Hot
24 VAC
120 VAC
Neutral
TRANSFORMER
(Class II)
THERMOSTAT
L R
SYSTEM
Limit or
Safety
Switches
Hot
24 VAC
120 VAC
Neutral
TRANSFORMER
(Class II)
THERMOSTAT
SYSTEM
Limit or
Safety
HOT
Switches
24 VAC 120 VAC
NEUTRAL
Auxiliary
NOTE
Heating
Transformer
The accessory relay scheme
(Class II)
is required when safety
circuits exist in both systems.
Limit or
Safety
HOT
Switches
120 VAC
NEUTRAL
(Class II)
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