Installation manual

835966-UIM-D-0614
Johnson Controls Unitary Products 19
FIGURE 19: Thermostat Wiring – Two-Stage Heat Pump - Variable Speed Modulating Furnace
HP 28A Two Stage Heat Pump – Variable Speed Modulating Furnace (With Hot Heat Pump Operation)
O
Reversing Valve
Energized in Cool
C
24 – Volt Common
R
24 – Volt Hot
W1 OUT
First Stage Heat
W2 OUT
Second Stage Heat
Y2 OUT
Second Stage Compressor
Y1
Single Stage Compressor
X/L
Malfunction Light
Y2
Second Stage Compressor
W
Auxiliary Heat
BS
Bonnet Sensor
BSG
Bonnet Sensor
YORKGUARD VI
CONTROL
TWO STAGE
HEAT PUMP
Bonnet Sensor
(Optional)
C
24 – Volt Common
Y1
First Stage Compressor
G
Fan
THERMOSTAT
R
24–VoltHot
W3
Third Stage Heat
C
24 – Volt Common
R
24–VoltHot
Y1
Single Stage Compressor
VARIABLE SPEED
MODULATING
FURNACE CONTROL
G
Fan
VARIABLE SPEED
MODULATING
FURNACE
Y/Y2
Second or Full
Stage Compressor
HUM
Dehumidification-
Open on Humidity Rise
W
Modulating Heat
Move HUMIDISTA T
jumper to “YES”
if humidistat is to be used.
PC(8/9)
ID MODELS
FC(8/9)C
FL(8/9)C
YZE
OD MODELS
YZH
H*5
H*8
Change Hot Heat Pump
jumper on the heat pump
control to “ON”
A015-001
S1-THSU32HP7b
Fault
Y2
Second Stage
Compressor
W2
Second Stage Heat
W1/O/B
First Stage Heat
HUM
DHUM
Jumper 1 must be set
to “HEATPUMP”
Jumper 2 must be set
to “O”
Jumper 3 must be set
to “GAS”
Setup Step 50 “Dual
Fuel” must be set
“External”
Change “FFuel” jumper
on the heat pump control
to ‘ON”