Trane Tracer VV550 User Manual

CNT-SVX17G-EN 49
Sequence of Operations
reheat are limited by the communicated auxiliary heat enable. The methods of control
for the reheat actuation schedule with a parallel fan present are described in the following
tables:
• Table 69 on page 105. Local heat only with parallel fan present
• Table 70 on page 105. Local and remote heat with local heat priority and parallel fan
pr
esent
• Table 71 on page 106. Local and remote heat with remote heat priority and parallel fan
pr
esent
Reheat Override
All reheat is subject to being remotely enabled or disabled by the communicated
auxiliary heat enable network variable. When the variable enables less than 100% of
controller capacity, the controller limits the use of reheat to the percentage enabled.
Reheat may be enabled in 0.5% increments. For heat stages that cannot support such fine
increments, the range 0% to 100% is divided into equal sections and each stage is
successively enabled. Table 31 shows an example for a three-stage hot water reheat unit.
Table 31.Example for a three-stage hot water reheat unit
Communicated auxiliary heat enable
value
Number of stages enabled
0% No stages enabled
0.5% to 33% Stage 1 enabled
33.5% to 66.5% Stages 1 and 2 enabled
67% to 100% Stages 1, 2, and 3 enabled
Morning warm-up
The controller enters morning warm-up on receipt of a communicated command. This
is the only way morning warm-up can be activated. The controller remains in morning
warm-up until the command is changed.
Morning warm-up uses the occupied heating setpoint
regardless of the occupancy
mode. All ventilation requirements are waived during morning warm-up. Table 32
shows contro
ller operation during morning warm-up.
Table 32.Controller operation during morning warm-up
Primary air temperature Space temperature
Primary airflow
control
Fan control Reheat control
Cold air in duct:
Primary air temperature
a
less than configured auto-
changeover setpoint minus
10°F
< Active heating
setpoint
Local reheat min Series On
Parallel On
Reheat On (All
stages on)
> Active heating
se
tpoint plus 0.5°F
Cool min Series On
Parallel Off
Reheat Off

Trane Tracer VV550 Specifications

General

Brand	Trane
Model	Tracer VV550
Category	Controller
Language	English