SM Split AH/AV Air Handler
SM Split AH/AV Air Handler8733826256 (2020/06)
12 | Electrical
Subject to change without prior notice
Low-Voltage Connection Points
Table 3 Low-Voltage Connection Points
Tables Notes:
1) If the condensate overflow sensor option is
utilized connect “CS” at the condensing section
to “CS” at the air handler. Be sure to ground
power supply.
2) If service LED is utilized connect “ALR” terminal
on the UPM board to “L” on the thermostat sub
base. The wiring may be spliced in the air
handling unit. The “ALR” output is hot (R) so
check thermostat instruction manual to ensure
compatibility.
3) “O” – reversing valve is energized in the cooling
mode. Fail safe is to heating.
4) Utilized when electric strip heater package
present.
5) Will vary depending on the thermostat.
Function From
Thermostat
To Air Handler From Air
Handler
To
Condensing
Section
24 VAC Common
C C C C
24 VAC Power
R R R R
Fan Operation
G G — —
Reversing Valve
3
O O O O
Compressor 1
st
Stage
Y1 Y1 Y1 Y1
Compressor 2
nd
Stage
Y2 Y2 Y2 Y2
Condensate Sensor
1
— — CS CS
Alarm Output (from
UPM)
2
L/ALR Splice ALR (UPM)
Auxiliary Electric Heat
4
W/W1/W2 W1 — —
Second-Stage Auxiliary
Heat/Emergency Heat
4
W/E, W1/E, W2/E
5
W2 — —
To Next Page
Loading...
