
SSP-SVX15C-EN
31
Table 7. Heat pump operation with thermostat (continued)
Inputs Outputs
Y1 Y2 G W1 W2 O X2
Cool Heat1 Indoor Fan
Don't
Care
Don't
Care
Don't
Care
Don't
Care
Don't
Care
Don't
Care
ON OFF Em Heat ON
Note: Stage 1 = Circuit 1 and Stage 2 = Circuit 2
Table 8. Heat pump operation with a zone sensor
with lead/lag enabled
Heating Request Circuit Output
0 (None)
All Off
1 Circuit 1
2 Circuit 2 + Circuit 1
3
Auxiliary Heat 1
4
Auxiliary Heat 2
Table 8. Heat pump operation with a zone sensor
with lead/lag enabled (continued)
Heating Request Circuit Output
0 (None)
All Off
1 Circuit 2 + Circuit 1
2 Circuit 1 + Circuit 2
3
Auxiliary Heat 1
4
Auxiliary Heat 2
Table 9. Heat pump control (1-step mechanical heating)
Active Unit
Mode
Stage
Indoor Fan
Compressor
Auxiliary
Heat 1
Auxiliary
Heat 2
Switchover
Valve 1
Switchover
Valve 2
(a)
Heat/Off
Off Off Off Off Off Off Off
Heat
Stage 1
On
Both
Compressors
Off Off Off Off
Heat
Auxiliary 1
On
Both
Compressors
On Off Off Off
Heat
Auxiliary 2
On
Both
Compressors
On On Off Off
Emergency
Heat
Stage 1
On Off On Off Off Off
Emergency
Heat
Stage 2
On Off On On Off Off
Heat Defrost On
Both
Compressors
On Off
On
(b)
On
(b)
Cool Don’t Care Off Off Off Off On On
(a)
Only units configured as an independent circuit heat pump will control the switchover valve 2 output.
(b)
On units with independent circuits, only the circuit whose conditions are correct for defrost will enter defrost mode and energize the switchover valve. The
other circuit's switchover valve will remain in its previous state until it has a defrost request or until the unit mode changes.
Table 10. Heat pump control (2-step mechanical heating)
Active Unit
Mode
Stage
Indoor Fan
Compressor
Auxiliary
Heat 1
Auxiliary
Heat 2
Switchover
Valve 1
Switchover
Valve 2
(a)
Heat/Off
Off Off Off Off Off Off Off
Heat
Stage 1
On
Compressor 1
Off Off Off Off
Heat
Stage 2
On
Both
Compressors
Off Off Off Off
Heat
Auxiliary 1
On
Both
Compressors
On Off Off Off
Heat
Auxiliary 2
On
Both
Compressors
On On Off Off
SSttaarrtt--UUpp
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