438335-UIM-C-1209
Johnson Controls Unitary Products
15
FIGURE 20:
Thermostat Chart - Two Stage AC with Two Stage Variable Speed Furnace
AC 24C
Two
Stage Air Conditioner – Two Stage Variable Speed Furnace
TWO STAGE
AIR
CONDITIONER
C
24 – Volt Common
R
24 – Volt Hot
Y1
First Stage Compressor
Y2
Second Stage
Compressor
C
24 – Volt Common
Y1
First Stage Compressor
L
Malfunction Light
Y2
Second Stage
Compressor
G
Fan
*PP32U71124
*PP32U72124
THERMOSTAT
R
24 – Volt Hot
W2
Second Stage Heat
DHM
Dehumidification
HM
Humidistat
Step 1 of Thermostat User
Configuration Menu must
be set to MLTISTG
E/W1
First Stage Heat
24VAC Humidifer
(Optional)
Optional Harness
Part Numbers:
SAP = Legacy
265904 = 031-09169
449572
1
C
24 – Volt Common
R
24 – Volt Hot
Y1
Single Stage
Compressor
TWO STAGE
VARIABLE SPEED
FURNACE CONTROL
G
Fan
TWO STAGE
VARIABLE SPEED
FURNACE
W/W1
First Stage Heat
Y/Y2
Second or Full
Stage Compressor
W2
Second Stage Heat
O
Reversing Valve
X/L
Malfunction Light
DHUM
Dehumidification
1
Move DHUM
jumper to “YES”
if humidistat is to be used.
(G/L)*(8/9)V
(F/L)*(8/9)V
PV(8/9)
ID MODELS
Comfort Alert Interface
(two pin connector)
E2/P Switch must be in the
E2 position
TM(8/9)V
