835965-UIM-C-0814
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
ID MODELS
EAC (24VAC out)
Electronic Air Cleaner
HUM OUT
(24VAC out)
Humidifier
External Humidistat
(Optional)
Open on Humidity Rise
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.
Relay
Relay
A0215-002
MV
AHV
