292278-UIM-A-0108
10
Unitary Products Group
FIGURE 6:
Thermostat Chart – Two Stage AC - Variable Speed Modulating Furnace
AC 26B
Two
Stage Air Conditioner – Variable Speed Modulating 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
R
24 – Volt Hot
Y1
Single Stage Compressor
VARIABLE SPEED
MODULATING
FURNACE CONTROL
G
Fan
VARIABLE SPEED
MODULATING
FURNACE
Y/Y2
Second or Full
Stage Compressor
HUM
Dehumidification-
Open on Humidity Rise
W
Modulating Heat
Part Numbers:
SAP = Legacy
171334 = 031-09153
1
1
Move HUMIDISTAT
jumper to “YES”
if humidistat is to be used.
FL9C
FC9C
PC9
ID MODELS
External Humidistat
(Optional)
Open on Humidity Rise
24VAC Humidifier
(Optional)
External Humidistat
(Optional)
Open on Humidity Rise
2
2
Part Number:
S1-2HU16700124
2
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
W
First Stage Heat
E/W1
First Stage Heat
Step 1 of Thermostat User
Configuration Menu must
be set to MS 2
Connection of the “C”
terminal, 24-Volt common
is optional when used with
batteries
Connection of the “C”
terminal, 24-Volt common
is optional when used with
batteries
