835966-UIM-A-0112
Johnson Controls Unitary Products
19
FIGURE 20:
Thermostat Wiring – Two-Stage Heat Pumps - Variable Speed Modulating Furnaces
HP 28C
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
R
24 – Volt Hot
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
Change FFuel jumper
on the heat pump control
to “ON”
1
Part Numbers:
SAP = Legacy
171334 = 031-09153
2
2
Move HUMIDISTAT
jumper to “YES”
if humidistat is to be used.
Part Numbers:
SAP = Legacy
126768 = 031-09137
18395 = 031-01996
340512 = 031-09178
1
PC(8/9)
ID MODELS
FC(8/9)C
FL(8/9)C
YZE
OD MODELS
YZH
H*5
H*8
C
24 – Volt Common
R
24 – Volt Hot
Y1
First Stage Compressor
O
Reversing Valve
Energized in Cool
L
Malfunction Light
Y2
Second Stage Compressor
G
Fan
*DN22H00124
*DP22U70124
THERMOSTAT
E/W1
First Stage Aux. Heat
W2
Second Stage Aux. Heat
C
24 – Volt Common
Y
First Stage Compressor
O/B
Reversing Valve
L
Malfunction Light
Y2
Second Stage Compressor
G
Fan
*PP32U70124
THERMOSTAT
E
Emergency Heat
R
24 – Volt Hot
(Heat XFMR)
RC
24 – Volt Hot
(Cool XFMR)
AUX
Auxiliary Heat
Step 1 of Thermostat
Installer/Configuration
Menu must be set to “HP2”
Selection of GAS/ELEC
switch on thermostat
not necessary
Thermostat Installer Setup
0170-System Type-
must be set to 12
3 Heat/2 Heat Pump
Thermostat Installer Setup
0190-Changeover Valve-
must be set to 0
O/B terminal
Energized in Cooling
Thermostat Installer Setup
0200-Backup Heat Source-
must be set to 1
Heat Pump Backup Heat
Source is Fossil Fuel
External Humidistat
(Optional)
Open on Humidity Rise
Thermostat Installer Setup
0210-External Fossil Fuel
Kit- must be set to 1
Heat Pump Control
is Controlling Heat Pump
Backup Heat
Change Hot Heat Pump
jumper on the heat pump
control to “ON”
3
