259720-CTG-B-0108
6
Unitary Products Group
Thermostat Chart - PSC Modulating Furnace/Single Stage Air Conditioner
AC 11C
Single Stage Air Conditioner
– PSC Modulating Furnace
FL9M
FC9M
PM9
ID MODELS
Part Numbers:
SAP = Legacy
155941 = 031-09140
1
C
24 – Volt Common
R
24 – Volt Hot
Y1
Single Stage Compressor
PSC
MODULATING FURNACE
G
Fan
PSC
MODULATING
FURNACE
Y/Y2
Second or Full
Stage Compressor
1
W
Modulating Heat
C
24 – Volt Common
Y
Compressor Contactor
SINGLE STAGE
AIR
CONDITIONER
SINGLE STAGE
AIR CONDITIONER
24VAC Humidifier
(Optional)
Connection of the “C”
terminal, 24-Volt common
is optional when used with
batteries
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
Thermostat Installer Setup
0170-System Type-must
be set to 9-2 Heat/1 Cool
Multistage Conventional
Connection of the “C”
terminal, 24-volt common
is optional when used with
batteries
Thermostat Installer Setup
1-System Type-must
be set to 7-2 Heat/1 Cool
Multistage Conventional
Thermostat Installer Setup
15-Compressor Protection
-must be set to 5
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
Part Number:
S1-2HU16700124
2
External Humidistat
(Optional)
Open on Humidity Rise
2
C
24 – Volt Common
Y1
First Stage Compressor
Y2
Second Stage
Compressor
G
Fan
*PP32U70124
THERMOSTAT
AUX
Auxiliary Heat
R
24 – Volt Hot
(Heat XFMR)
R
24 – Volt Hot
(Cool XFMR)
C
24 – Volt Common
Y1
First Stage Compressor
Y2
Second Stage
Compressor
G
Fan
*DN22U00124
THERMOSTAT
W2
Second Stage Heat
R
24 – Volt Hot
(Heat XFMR)
R
24 – Volt Hot
(Cool XFMR)
E/W1
Emergency Heat
E/W1
First Stage Heat
