Honeywell VisionPRO IAQ Product Data page 23

COMPRESSOR ONLY
50
BOTH COMPRESSOR AND
AUXILIARY HEAT
35
AUXILIARY ONLY
Fig. 32. Heat Pump Operation with Lockout
Temperatures Set.
When the outdoor temperature is between the two
temperatures, both the Compressor and Auxiliary Heat operate.
System Setting Fan Setting
Off Auto
Cool or Auto Auto
Cool or Auto Auto
Cool or Auto Auto
Heat or Auto Auto
Heat or Auto Auto
Heat or Auto Auto
Heat or Auto Auto
a
G energizes only if Installer set up number 180 is set to Option 1 (Electric Heat).
b
If installer setup (ISU174) is configured for two stages of cooling.
c
If installer setup (ISU 176) is configured for two or more stages of heating.
d
If installer setup (ISU 176) is configured for three stages of heating.
e
G energizes only if Installer set up number 180 is set to Option 1 (Electric Heat) or 2 (Hot water coil).
System Setting Fan Setting
Off Auto
Cool or Auto Auto
Cool or Auto Auto
Cool or Auto Auto
Heat or Auto Auto
Heat or Auto Auto
Heat or Auto Auto
Heat or Auto Auto
Heat or Auto Auto
Auto
b
Em.Heat
Auto
b
Em.Heat
b Auto
Em.Heat
a
Configure O/B in Installer Setup. Based on last piece of equipment called (cooling = O or Heating = B).
b
Red LED is on. See LED indication section for more details (page 21).
c
If installer setup (ISU 174) is configured for 2 compressor stages.
d
If installer setup (ISU 176) is configured for one or more stages of Auxiliary Heat.
e
If installer setup (ISU 176) is configured for two stages of Auxiliary Heat.
f
If thermostat is controlling backup heat, see temperature lockout section (page 22).
AUXILIARY
LOCKOUT
TEMPERATURE
COMPRESSOR
LOCKOUT
TEMPERATURE
M19950
Table 5. Sequence of Operation for Conventional Systems.
Call for Action
None
None
Stage 1 Cooling
Stage 1 and Stage 2 cooling
None
Stage 1 heating
Stage 1 and Stage 2 heating
Stage 1, Stage 2 and Stage 3 heating
Table 6. Sequence of Operation for Heat Pump Systems.
Call for Action
none
none
Stage 1 cooling
Stage 1 and Stage 2 cooling
none
Stage 1 heating
Stage 1 and Stage 2 heating
Stage 1, Stage 2 and Stage 3 heating
Stage 1, Stage 2, Stage 3 and Stage 4 heating Y
None
Stage 1 Heating
Stage 1 and Stage 2 heating
VISIONPRO
Operation in Emergency Heat Mode
Once the thermostat is placed into the Emergency Heat mode,
the compressor and auxiliary lockout features are turned off. In
the Emergency heat mode, the compressor is locked out. The
first stage of heat is whatever is connected to the AUX
terminal. The second stage of heat is connected to the AUX2.
terminal.
Operating Sequence
The thermostat energizes specific terminal(s), depending on
the demand for heating, cooling or fan. The thermostat screen
shows the time, inside temperature, system and fan selections.
Additional indicators are shown when the heating, cooling or
fan is energized. See Table 5 and 6 for specification
information.
Energize Terminals
None
None
Y, G
b
Y, Y2 , G
None
a
W1, G
W1, W2
W1, W2
Energize Terminals
a
O/B
a
O/B
Y, G, O/B
c
Y, Y2 , G, O/B
a
O/B
Y, G, O/B
c
Y, Y2 , G, O/B
f c,f
Y , Y2
f c,f
, Y2
a
O/B
d
AUX , G, O/B
d
AUX , AUX2
23
®
IAQ TOTAL HOME COMFORT SYSTEM
Screen Message
None
None
Cool On
Cool On
None
Heat On
c e Heat On
, G
Heat On
c d e
, W3 , G
Screen message
None
None
Cool On
a
Cool On
a
None
a Heat On
a Heat On
Aux Heat On
d a
, AUX , G, O/B
Aux Heat On
d e a
, AUX , AUX2 , G, O/B
None
Aux Heat On
a
e a Aux Heat On
, G, O/B
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