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55
T
AI - Zone temp
AI - Zone setpoint adjust
BI - Zone override
RA
DA
BO - Fan start/stop
BI - Fan status
(optional)
M
HP
BO - Reversing valve
Elec
BO - Heating stage 2
(optional)
BO - Heating stage 1
(optional)
CT
T
Hardware Points
Point Name
AI
BI
BO
AO
I/O #
Comments
Zone temp
X
Internal
Zone setpoint
adjust
X
Internal
Zone override
X
Internal
Discharge air temp X
UI-2
Optional – Requires sensor
(Type II thermistor)
Fan status
X
UI-4
Optional - Dry contact
NOTE
Short input to ground if
not used.
Compressor stage 1
X
DO-1 (Y1) Relay output
Compressor stage 2
X
DO-2 (Y2) Relay output
Fan start/stop
X
DO-3 (G)
Relay output
Supplemental heat
stage 1
X
DO-4 (W1) Optional – Relay output
Supplemental heat
stage 2
X
DO-5 (W2) Optional – Relay output
Reversing valve
X
DO-6
Relay output. Closed = Heating
#4: Air source heat pump - intermittent fan - reverse to heat
Control schematic
Point list