835965-UIM-C-0814
Johnson Controls Unitary Products
15
FIGURE 16:
Thermostat Chart - Two Stage AC – Variable Speed Furnaces
AC 31A
Two
Stage Air Conditioner – Variable Speed Air Handler
C
24 – Volt Common
Y
First Stage Compressor
Y2
Second Stage
Compressor
G
Fan
*PP32U70124
THERMOSTAT
W2
Second Stage Heat
R
24 – Volt Hot
(Heat XFMR)
RC
24 – Volt Hot
(Cool XFMR)
Connection of the “C”
terminal, 24-Volt common
is optional when used with
batteries
Thermostat Installer Setup
0170-System Type-must
be set to 8-2 Heat/2 Cool
Multistage Conventional
C
24 – Volt Common
Y
First Stage Compressor
Y2
Second Stage
Compressor
G
Fan
*DN22U00124
THERMOSTAT
W2
Second Stage Heat
R
24 – Volt Hot
(Heat XFMR)
RC
24 – Volt Hot
(Cool XFMR)
W
First Stage Heat
W
First Stage Heat
Connection of the “C”
terminal, 24-volt common
is optional when used with
batteries
Thermostat Installer Setup
1-System Type-must
be set to 6-2 Heat/2 Cool
Multistage Conventional
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.
Thermostat Installer Setup
15-Compressor Protection
-must be set to 5
R
24 – Volt Hot
A0214-002
Relay
Relay
MV
AHV
