STS32/STS32H Touchscreen Programmable Thermostat
Table 7. Sequence of Operation for Conventional Systems.
System Setting
Fan Setting
Call for Action
Energize Terminals
Screen Message
OFF AUTO None None None
COOL AUTO None None None
COOL or AUTO
AUTO
Stage 1 Cooling
Y, G
Cool On
COOL or AUTO
AUTO
Stage 1 and Stage 2
Cooling
Y, Y2
b
, G
Cool On
HEAT AUTO None None None
HEAT or AUTO
AUTO
Stage 1 Heating
W, G
a
Heat On
HEAT or AUTO
AUTO
Stage 1 and Stage 2
Heating
W, W2
c
, G
a
Heat
On
a
G energizes only if Installer Setup number 0180 is set to Electric.
b
If Installer Setup System type is set to two stages of cooling.
c
If Installer Setup System type is set to two stages of heating.
Table 8. Sequence of Operation for Power Open and Power Closed Valves or Normally
Open Valves.
System Setting
Fan Setting
Call for Action Energize
Terminals
Screen
Message
OFF AUTO None None None
HEAT N/A None Y None
HEAT N/A Heat W Heat
On
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STS32/STS32H Touchscreen Programmable Thermostat
Table 9. Sequence of Operation for Heat Pump Systems.
System Setting
Fan Setting
Call for Action
Energize Terminals
Screen Message
OFF AUTO None O/
B
a
None
COOL AUTO None O/
B
a
None
COOL or AUTO
AUTO
Stage 1 Cooling
Y, G, O/B
a
Cool On
COOL or AUTO
AUTO
Stage 1 and Stage 2
Cooling
Y, Y2
d
, G, O/B
a
Cool On
HEAT AUTO None O/B
a
None
HEAT or AUTO
AUTO
Stage 1 Heating
Y, G, O/B
a
Heat On
HEAT or AUTO
AUTO
Stage 1 and Stage 2
Heating
Y, AUX
c
, G, O/B
a
Aux Heat On
HEAT or AUTO
AUTO
Stage 1, 2 and 3
Heating
Y, Y2
d
, AUX
e
, G,
O/B
a
Aux Heat On
Em. HEAT
AUTO
None
L, O/B
a
None
Em. HEAT
AUTO
Stage 1 Heating
E, G, L, O/B
a
Heat On
Em. HEAT
AUTO
Stage 1 and Stage 2
Heating
E, AUX, G, L, O/B
a
Aux Heat On
a
Configure O/B in Installer Setup(cooling = O or heating = B).
c
If Installer Setup System Type is set to 2Heat/1Cool Heat Pump with Auxiliary Heat.
d
If Installer Setup System Type is set to 3Heat/2Cool Heat Pump with Auxiliary Heat.
e
This terminal does not energize if Installer Setup System type is set to 2 Heat/2 Cool Heat
Pump with no Auxiliary Heat.
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