835965-UIM-C-0814
Johnson Controls Unitary Products
9
FIGURE 10:
Thermostat Wiring – Single Stage Air Conditioner (with AC control) – VS Air Handler
V/S Air Handler
Single Stage Air Conditioner (with AC control) -
ID MODELS
Jumper 1 must be set
to “GAS/ELEC”
Y1
First Stage
Compressor
W2
Second Stage Heat
G
Fan
S1-THSU21P1b
THERMOSTAT
R
24 – Volt Hot
W1/O/B
First Stage Heat
C
24 – Volt Common
Jumper 3 must be set
to “ELEC”
SINGLE STAGE
AIR
CONDITIONER
C
24 – Volt Common
R
24 – Volt Hot
Y1
First Stage Compressor
Y2
Second Stage
Compressor
SINGLE STAGE
AIR CONDITIONER
External Humidistat
(Optional)
Open on Humidity Rise
(Optional)
24VAC
Electronic Air Cleaner
(Optional)
Y1
First
Stage Compressor
COM
24 – Volt Common
R
24 – Volt Hot
G
Fan
W2
Second Stage Heat
O
Reversing Valve
Energized in Cool
X/L
Malfunction Light
HUM
Humidity Switch
Open on Humidity Rise
VARIABLE SPEED
AIR HANDLER
CONTROL
Y/Y2
Second or Full
Stage Compressor
W1
First Stage Heat
EAC
(24 VAC out)
Electronic Air Cleaner
HUM OUT
(24 VAC out)
VARIABLE
SPEED
AIR HANDLER
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.
Relay
Relay
A0208-002
MV
AHV
