Heating And Cooling Changeover Logic - Trane Tracer VV550 Installation, Operation And Maintenance Manual

Sequence of Operations

Heating and Cooling Changeover Logic

The controller can receive communicated requests for heating or cooling operation. Two
communicated variables (communicated application mode and communicated heat/
cool mode) are used to communicate the requests to the controller (see
more information on the relationship between these two variables, refer to
page
Table 29.Heating and cooling changeover logic
System
command,
communicated Primary air
application temp,
mode, communicated
communicated source temp or
heat/cool mode local input
Heat Hot
Cold
Invalid
Cool Hot
Cold
Invalid
Auto Hot
Cold
Invalid
42
92.
Reported
heat/
cool
mode or
reported
Local unit
zone status
g f
demand mode
Don't care Heat
Don't care Heat
Don't care Heat
Don't care Cool
Don't care Cool
Don't care Cool
Heat Heat
Cool Cool
Heat Heat
Cool Cool
Heat Heat
Air
valve Air valve
a, b c
action position
Heat Modulation
Cool Refer to Table 40
on page
Active Minimums
Heat Modulation
d
Heat Refer to Table 40
on page
Active Minimums
Cool Modulation
Cool Modulation
d
Heat Modulation
Heat Refer to Table 40
on page
Active Minimums
Cool Refer to Table 40
on page
Active Minimums
Cool Modulation
Heat/ Note e
Cool
e
Table
Table 62 on
Active
h
minimum
Refer to Table 40 on
page p. 60 for Active
Minimums
Refer to Table 40 on
p. 60 for page p. 60 for Active
Minimums
Refer to Table 40 on
page p. 60 for Active
Minimums
Refer to Table 40 on
p. 60 for page p. 60 for Active
Minimums
Refer to Table 40 on
page p. 60 for Active
Minimums
Refer to Table 40 on
page p. 60 for Active
Minimums
Refer to Table 40 on
page p. 60 for Active
Minimums
Refer to Table 40 on
p. 60 for page p. 60 for Active
Minimums
Refer to Table 40 on
p. 60 for page p. 60 for Active
Minimums
Refer to Table 40 on
page p. 60 for Active
Minimums
Note e
CNT-SVX17G-EN
29). For