Traq Overrides And Special; Considerations; Supply Air Temperature Control - Heating And Cooling - Trane Voyager Commercial Installation, Operation And Maintenance Manual

S S t t a a r r t t u u p p
Table 31. RTVM space pressure setpoint (continued)
Voltage (Vdc) Setpoint (IWC)
2.25
2.275
2.3
2.325
2.35
2.375
2.42
Table 32. RTVM space pressure setpoint deadband
Voltage (Vdc) Setpoint (IWC)
0.2
0.35
0.53
0.71
0.91
1.1
1.235
1.37
1.505
1.65
1.75
1.85
1.95
2.05
2.13
2.21
2.28
2.35
2.42

Traq Overrides and Special

Considerations

Traq functionality is not used in unoccupied mode
since fresh air control is an occupied ventilation
function. Damper position will be set to 0% minimum
in Unoccupied as with other types of unit
configuration.
If the Remote Minimum Position pot on the RTEM is
shorted (as with NOVAR controls) the Traq minimum
damper position will be overridden to 0% as with other
unit configurations.
Traq functions and sensor value are only valid during
active Supply Fan operation therefore a value of "0
CFM" will be substituted for any low level (bleed
through) sensor value that may be sensed on the OA
Flow Sensor during "Fan OFF" periods. OA Damper
Minimum Position is only valid during active fan
operation in all configurations.
The Design Min OA Flow Setpoint will be limited to a
lower limit of 1,000 CFM and an upper limit of 20,000
CFM. Setting of values outside of this range, except for
"0 CFM", will result in the setting being clamped within
the range. A value of "0" CFM will be allowed and will
result in initialization of the Traq OA Damper Min
Position calculation, and an active value of "0%" will be
sent as the Active Traq setpoint. This allows the user to
56
0.24
0.25
0.26
0.27
0.28
0.29
0.3
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.1
0.11
0.12
0.13
0.14
0.15
0.16
0.17
0.18
0.19
0.2
set the damper closed by setting the flow setpoint to 0
CFM.
If Demand Controlled Ventilation is configured then the
lower limit of the Design Min OA Flow Setpoint will be
1,500 CFM to allow a gap to the DCV Min OA Flow
Setpoint of 500 CFM making its lower limit 1,000 CFM.
When the Design Min OA Flow Setpoint is greater than
1,500 CFM a minimum of 500 CFM offset will be
enforced between the DCV Min OA Flow Setpoint and
the Design Min OA Flow Setpoint.
If configured for Traq operation and OA CFM
Compensation, the unit will perform Traq control since
it will be the most accurate method of control. This
situation might occur if a unit is upgraded to Traq
control, but the OA CFM Compensation config jumper
on the RTEM is left on. It will be assumed by the
presence of a valid OA CFM Flow Sensor and the RTVM
version that supports Traq is accompanied by all the
necessary unit equipment upgrades.
Supply Air Temperature Control -
Heating and Cooling
For Cooling, Heating (Modulating Heat Only), and Hot
Gas Reheat operation the unit will control the active
capacity outputs to meet a varying, calculated
Discharge Air Setpoint that is calculated based on zone
conditions in order to maintain the Zone Temperature
to the active Zone Setpoint. Note that this setpoint will
be clamped between the user selected DA Heat and DA
Cool - Fan Speed setpoints that are set on the RTOM for
compressor and economizer control. In general, as the
zone temperature rises above the ZCSP, the Active
Discharge Air Setpoint will be calculated down and as
the zone temperature falls below the ZHSP Tset will be
calculated upward. This calculated setpoint is a direct
indication of space demand and is also used to
determine the proper supply fan speed to meet the
space requirements. During active capacity control, the
unit will utilize a +/- 3.5°F deadband around the active
Discharge Air Setpoint to determine when to request
additional heating or cooling capacity similarly to
traditional VAV control, as described below. If the unit
is maintaining the discharge air temperature within the
+/- 3.5°F deadband around the calculated discharge air
setpoint requirements, no additional capacity will be
requested.
The calculated setpoint will also be used for active
economizer control, but the economizer will utilize a
tighter control deadband (+/- 1.5°F) than that is used for
compressor output control. Also, as on Traditional VAV
units, mechanical cooling will be inhibited if
economizing is enabled until the economizer has been
full open for 3 minutes.
RT-SVX34R-EN