Braeburn 1220NC - Manual (Page 5)

4
NOTES - Conventional Systems
[1] If batteries are installed the 24 Volt AC common connection is optional
[2] Remove factory installed jumper for dual transformer systems
[3] In dual transformer systems, transformer common must come from
cooling transformer
[4] If needed for system
Provide disconnect and overload protection as required.
2 HEAT / 1 COOL Single or Dual Transformer (1220NC Only)
Set System Type to CONV
Rh 24 Volt AC Power (heating transformer) [note 2]
Rc 24 Volt AC Power (cooling transformer) [note 2]
W1 Heat Relay Stage 1
W2 Heat Relay Stage 2
Y1 Compressor Relay Stage 1
G Fan Relay
C 24 Volt AC Transformer Common [note 1, 3]
Conventional Systems
(cont.)
Typical Wiring Configurations
NOTE: The “Installer Switch” option will be configured in the next step.
Heat Pump Systems
1 HEAT / 1 COOL - No Auxiliary Heat
Set Installer Switch to HP
Rh 24 Volt AC Power
Rc Connected to Rh with supplied Jumper Wire
O or B Changeover Valve [note 2]
Y1
Compressor Relay
G Fan Relay
C 24 Volt AC Transformer Common [note 1]
2 HEAT / 1 COOL - Including Auxiliary Heat (1220NC only)
Set Installer Switch to HP
Rh 24 Volt AC Power
Rc Connected to Rh with supplied Jumper Wire
O or B Changeover Valve [note 2]
Y1
Compressor Relay (1st stage heating/cooling)
W2 Auxiliary Heat Relay (2nd stage heating) [note 3]
E Emergency Heat Relay [note 3]
G Fan Relay
C 24 Volt AC Transformer Common [note1]
(Continued)