835966-UIM-E-0814
14
Johnson Controls Unitary Products
FIGURE 14:
Thermostat Wiring –
Single Stage Heat Pump (with YGVI control)
– V/S Air Handler
Single Stage Heat Pump (with YGVI control) - V/S Air Handler
ID MODELS
MV
VARIABLE
SPEED
AIR HANDLER
SINGLE STAGE
HEAT PUMP
THERMOSTAT
S1-THSU21P1b
C
24 - Volt Common
Y1
First Stage
Compressor
R
24 - Volt Hot
G
Fan
W2
Second Stage Heat
W1/O/B
First Stage Heat
Jumper 1 must be set
to “HEATPUMP”
Jumper 2 must be set
to “O”
Jumper 3 must be set
to “ELEC”
Move the HUM STAT
jumper to “YES”
if humidistat is to be
used.
Refer to AH
documentation
for W1 and W2 electric
heat staging options.
BS
Bonnet Sensor
BSG
Bonnet Sensor
W
Auxiliary
Y2
Second Stage
Compressor
X/L
Malfunction Light
O
Reversing Valve
Energized in Cool
Y2 OUT
Second Stage
Compressor
R
24 - Volt Hot
Y1
Single Stage
Compressor
C
24 - Volt Common
YORKGUARD VI
CONTROL
VARIABLE SPEED
AIR HANDLER
CONTROL
COM
24 - Volt Common
Y/Y2
Second or Full
Stage Compressor
R
24 - Volt Hot
G
Fan
W1
First Stage Heat
W2
Second Stage Heat
Y1
First
Stage Compressor
O
Reversing Valve
Energized in Cool
X/L
Malfunction Light
HUM OUT
(24 VAC out)
Humidifier
EAC
(24 VAC out)
Electronic Air Cleaner
External Humidistat
(Optional)
Open on Humidity Rise
HUM
Humidity Switch
Open on Humidity Rise
W2 OUT
Second Stage Heat
W1 OUT
First Stage Heat
Change “FFuel” jumper
on the heat pump control
to “OFF”
24VAC Electronic
Air Cleaner Relay
(Optional)
24VAC Humidifier Relay
(Optional)
AHV
A010-001
