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Figure 15. Thermistor wires
To Thermistor #1
Controller Settings
Jumper Position for TTA Models (Cooling
Only)
For non-heat pump applications, the heat pump select
jumper must be in the Default (N.O.) position, and the
HP terminals must be left unconnected. Refer to
16, p.
15.
Figure 16. Jumper position for TTA
HEAT
PUMP
N.C.
N.O.
N.O.
24 VAC
COMMON
Y1
Y2
ACC-SVN190B-EN
To Thermistor #2
Pop-in Wire Tie
Thermistor #1
Low Ambient
Controller
Figure
Grommets
Thermistor #2
Low Ambient
Controller
Jumper Position for TWA Models (Heat
Pump)
For heat pump applications, the heat pump select
jumper must be in the (N.C.) position, see
15.
Figure 17. Jumper position for TWA
N.C.
HEAT
PUMP
N.C.
N.O.
24 VAC
COMMON
Y1
Y2
Operation
The low ambient controller is used to maintain head
pressure within an acceptable range when ambient
temperature falls below 50 °F. It reads discharge
pressure from the refrigeration circuit and "cycles" the
outdoor fan motor on and off to maintain the desired
I I n n s s t t a a l l l l a a t t i i o o n n
Figure 17, p.
15
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