835965-UIM-A-0112
16
Johnson Controls Unitary Products
FIGURE 17:
Thermostat Chart - Two Stage AC – Variable Speed Furnaces
AC 31B
Two
Stage Air Conditioner – Variable Speed Air Handler
Connection of the “C”
Terminal, 24-Volt Common,
is optional when used with
batteries
C
24 – Volt Common
R
24 – Volt Hot
Y
First Stage Compressor
Y2
Second Stage
Compressor
G
Fan
*DN22C00124
THERMOSTAT
W2
Second Stage Heat
C
24 – Volt Common
R
24 – Volt Hot
Y1
First Stage Compressor
Y2
Second Stage
Compressor
G
Fan
*DP22U70124
THERMOSTAT
W2
Second Stage Heat
Step 1 of Thermostat User
Configuration Menu must
be set to MS 2
W
First Stage Heat
E/W1
First Stage Heat
Connection of the “C”
Terminal, 24-Volt Common,
is optional when used with
batteries
COM
24 – Volt Common
R
24 – Volt Hot
W1
First Stage Heat
W2
Second Stage Heat
Y1
Single Stage Compressor
Y/Y2
Second or Full
Stage Compressor
O
Reversing Valve
Energized in Cool
X/L
Malfunction Light
HUM
Humidity Switch
Open on Humidity Rise
VARIABLE SPEED
AIR HANDLER CONTROL
G
Fan
VARIABLE SPEED
AIR HANDLER
1
AV
ID MODELS
SV
MV
EAC (24VAC out)
Electronic Air Cleaner
HUM OUT
(24VAC out)
Humidifier
Part Number:
S1-2HU16700124
2
Part Numbers:
SAP = Legacy
159481 = 031-09157
1
External Humidistat
(Optional)
Open on Humidity Rise
2
24VAC Humidifier
(Optional)
24VAC
Electronic Air Cleaner
(Optional)
TWO STAGE
AIR
CONDITIONER
C
24 – Volt Common
R
24 – Volt Hot
Y1
First Stage Compressor
Y2
Second Stage
Compressor
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.
