352867-UIM-A-0208
Unitary Products Group
9
FIGURE 9:
Thermostat Chart - Single Stage AC with PSC Air Handler
AC 1B
Single Stage Air Conditioner
– PSC Air Handler
C
24 – Volt Common
Y
Compressor Contactor
SINGLE STAGE
AIR
CONDITIONER
MA
SHP
AHP
ID MODELS
SINGLE STAGE
AIR CONDITIONER
Other Part Numbers:
SAP = Legacy
265902 = 031-09167
2
Part Numbers:
SAP = Legacy
159480 = 031-09156
1
COM
24 – Volt Common
R
24 – Volt Hot
W2
Second Stage Heat
O
Reversing Valve
Energized in Cool
X/L
Malfunction Light
HUM
Humidity Switch
Open on Humidity Rise
PSC
AIR HANDLER CONTROL
G
Fan
PSC
AIR HANDLER
1
EAC(24 VAC out)
Electronic Air Cleaner
HUM OUT
(24 VAC out)
Humidifier
Y1
Single Stage Compressor
Y/Y2
Second or Full
Stage Compressor
W1
First Stage Heat
Y
Full Stage Compressor
G
Fan
*BP11C50124
*BN11C01124
*DP11C40124
*DN11C00124
THERMOSTAT
RH
24 – Volt Hot
(Heat XFMR)
RC
24 – Volt Hot
(Cool XFMR)
W
Full Stage Heat
Selection of GAS/ELEC
switch on thermostat
is not necessary
C
24 – Volt Common
Y
Full Stage Compressor
G
Fan
*BN11C00124
THERMOSTAT
RH
24 – Volt Hot
(Heat XFMR)
RC
24 – Volt Hot
(Cool XFMR)
W
Full Stage Heat
Thermostat Installer Setup
1-System Type-must be
set to 0
C
24 – Volt Common
Thermostat Installer Setup
15-Compressor Protection
must be set to 5
24VAC Humidifier
(Optional)
24VAC
Electronic Air Cleaner
(Optional)
External Humidistat
(Optional)
Open on Humidity Rise
Part Number:
S1-2HU16700124
2
2
Move HUM STAT
jumper to “YES”
if humidistat is to be used.
Refer to AH documentation
for W1 and W2 electric
heat staging options.
