CNT-SVX17G-EN 51
Sequence of Operations
Maximum Flow Heat
The controller enters maximum flow heat on receipt of a communicated command and
remains in maximum flow heat until the command changes.
The controller maintains the flow rate at the heating maximum flow setpoint. Table 34
shows contro
ller operation during maximum flow heat.
Table 34.Controller operation during maximum flow
Primary air temperature
a
Space
temperature
Primary airflow
control
Fan control Reheat control
Cold air in duct;
Primary air temperature <
configured au
to-
changeover
setpoint minus 10°F
< active heating
setpoint
Heating max flow
setpoint
Series On
Parallel On
Reheat On
> active heating
se
tpoint plus
0.5°F
Heating max flow
setpoint
Series On
Parallel Off
Reheat Off
Warm air in duct;
Configured auto-changeover
setpoint
< primary air temperature <
configured reheat enable setpoint
minus 5°F
< active heating
setpoint
Heating max flow
setpoint
Series On
Parallel Off
Reheat Not
Present
< active heating
setpoint
Heating max flow
setpoint
Series On
Parallel On (w/
reheat)
Reheat On
> active heating
se
tpoint plus
0.5°F
Heating max flow
setpoint
Series On
Parallel Off
Reheat Off
Hot air in duct;
Configured reheat enable setpoint <
primary a
i
r temperature
< active heating
setpoint
Heating max flow
setpoint
Series On
Parallel Off
Reheat Off
> active heating
se
tpoint plus
0.5°F
Heating max flow
set
point
Series On
Parallel Off
Reheat Off
Night Purge
The controller enters night purge on receipt of a communicated command and remains
in night purge until this command is changed.
Night purge uses the occupied cooling setpoint
regardless of the occupancy mode. All
ventilation requirements are waived during night purge. This operational sequence is
identical to pre-cool.
Construction (Temporary Heat)
The controller controls the air valve at the maximum heating flow setpoint when no valid
space temperature is detected on reset. All local and remote reheat is locked out. Fan
operation remains unaffected.
a.Primary Air Temperature is derived from either the communicated Source Temperature, or the Primary/Discharge Air
Temperature sensor when configured for Primary Air Temperature. A communicated Application Mode of Max Heat forces the
controller to assume the primary is hot if neither the communicated Source Temperature or the local Primary Air Temperature
sensor is present. The default Primary Air Temperature does not come into play during Max Heat.
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