Trane Tracer VV550 User Manual

50 CNT-SVX17G-EN
Sequence of Operations
Pre-cool (Morning Cool Down)
The controller enters pre-cool on receipt of a communicated command. This is the only
way morning pre-cool can be activated. The controller remains in pre-cool until the
command is changed. This operational sequence is also used for night purge.
Pre-cool uses the occupied cooling setpoint re
gardless of the occupancy mode. All
ventilation requirements are waived during pre-cool. Table 33 shows controller
operat
ion during pre-cool.
Table 33.Controller operation during pre-cool
Primary air temperature
a
Space
temperature
Primary airflow
control
Fan control Reheat control
Cold air in duct:
Primary air temperature less than
configured au
to-
changeover
setpoint minus 10°F
< Active cooling
setpoint minus
2°F
Cool min Series On
Parallel Off
Reheat Off
> Active cooling
se
tpoi
nt
Normal control,
modulate cool min
to max
Series On
Parallel Off
Reheat Off
Warm air in duct:
Configured auto-changeover
setpoint
< primary air temperature
Do not care Heat min Series On
Parallel Off
Reheat Off
Hot air in duct:
Configured reheat enable setpoint <
primary a
i
r temperature
Do not care Heat min Series On
Parallel Off
Reheat Off
Warm air in duct:
Configured auto-changeover
setpoint
< primary air
temperature
a
< configured
reheat enable setpoint minus
5°F
b
< Active heating
setpoint
Normal control,
modulate from
heat min to max
Series On
Parallel Off
Reheat Not
Present
< Active heating
setpoint
Normal control,
modulate from
heat min to max
Series On
Parallel On (w/
re
he
at)
Reheat On (All
st
ages on
)
> Active heating
s
e
tpoint plus 0.5°F
Heat min Series On Parallel
Off
Reheat Off
Hot air in duct:
Primary air temperature
a
greater than configured reheat
enable setpoint
b
< Active heating
setpoint
Normal control,
modulate from
heat min to max
Series On
Parallel Off
Reheat Off
> Active heating
se
tpoint plus 0.5°F
Heat min Series On
Parallel Off
Reheat Off
a. Primary air temperature is derived from either communicated Source Temperature, or the Primary/Discharge air temperature sensor
when this input is configured for primary air temperature.
b. The Rover™ service tool checks the range of the configured reheat e
n
able setpoint: 70°F to 100°F (21.11°C to 37.78°C) for electric
heat; and 70°F to 200°F (21.11°C to 93.33°C) for hot water heat.
Table 32.Controller operation during morning warm-up (continued)
Primary air temperature Space temperature
Primary airflow
control
Fan control Reheat control
a. Primary air temperature is derived from either communicated source temperature, or the primary/discharge air temperature
sensor when configured for primary air temperature.

Trane Tracer VV550 Specifications

General

Brand	Trane
Model	Tracer VV550
Category	Controller
Language	English