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16 RT-PRC031-EN
Common to VAV and
CV Units
Space Pressure Control -
Statitrac™
A pressure transducer is used to
measure and report direct space
(building) static pressure. The user-
defined control parameters used in
this control scheme are space static
pressure setpoint, space pressure
deadband and exhaust enable point.
As the economizer opens, the
building pressure rises and once
above the exhaust enable point,
enables the exhaust fan and
dampers or exhaust VFD. The
exhaust dampers or VFD then
modulate to maintain space pressure
within the deadband.
Morning Warm-up Options
This feature may be enabled on all
types of factory installed heat units
as well as cooling only units
configured as “External Heat” (for
example, VAV boxes with reheat).
At the conclusion of Unoccupied
mode, while the economizer (if
supplied) is kept closed, the selected
zone is heated to the user-defined
Morning Warm-up setpoint. The unit
is then released to Occupied mode.
There are two types of Morning
Warm-up: full capacity or cycling
capacity.
Full Capacity Morning Warm-up
(MWU)
Full capacity Morning Warm-up uses
full heating capacity, and heats the
zone up as quickly as possible. Full
heating capacity is provided until the
Morning Warm-up setpoint is met.
At this point, the unit is released to
occupied mode.
Cycling Capacity Morning Warm-
up (MWU)
Cycling capacity Morning Warm-up
provides a more gradual heating of
the zone. Normal zone temperature
control with varying capacity is used
to raise the zone temperature to the
MWU zone temperature setpoint.
This method of warm-up is used to
overcome the “building sink” effect.
Cycling capacity MWU will operate
until the MWU setpoint is reached or
for 60 minutes, then the unit
switches to Occupied mode.
A control algorithm is used to
increase or decrease the amount of
heat in order to achieve the MWU
zone temperature setpoint.
Note: When using the Morning
Warm-up option in a VAV
heating/cooling air handler,
airflow must be maintained
through the air handler unit.
This can be accomplished by
electrically tying the VAV
boxes to the VAV box output
relay contacts on the Rooftop
Module (RTM) or by using
changeover thermostats.
Either of these methods will
assure adequate airflow
through the unit and
satisfactory heating of the
building.
Emergency Override
When a LonTalk communication
module is installed, the user can
initiate from the Trane Tracer
Summit or 3rd party BAS one of five
(5) predefined, not available to
configure, Emergency Override
sequences. The Humidification
output is deenergized for any
Emergency Override sequence. Each
Emergency Override sequence
commands the unit operation as
follows:
1. PRESSURIZE_EMERG:
– Supply Fan - On
– Supply Fan IGV / Supply Fan
VFD Open/Max (if so
equipped)
– Exhaust Fan - Off; Exhaust
Dampers Closed (if so
equipped)
– OA Dampers - Open; Return
Damper - Closed
– Heat - All heat stages off;
Mod Heat output at 0 vdc
– Occupied/Unoccupied/VAV
box output - Energized
– VOM Relay - Energized (if so
equipped)
– Preheat Output - Off
– Return Fan - Off; Exhaust
Dampers - Closed (if so
equipped)
– Return VFD - Min (if so
equipped)
2. EMERG_DEPRESSURIZE:
– Supply Fan - Off
– Supply Fan IGV / Supply Fan
VFD - Closed/Min (if so
equipped)
– Exhaust Fan - On; Exhaust
Dampers Open/Max (if so
equipped)
– OA Dampers - Closed; Return
Damper - Open
– Heat - All heat stages off;
Mod Heat output at 0 vdc
– Occupied/Unoccupied/VAV
box output - Energized
– VOM Relay - Energized (if so
equipped)
– Preheat Output - Off
– Return Fan - On; Exhaust
Dampers - Open (if so
equipped)
– Return VFD - Max (if so
equipped)
3. EMERG_PURGE:
– Supply Fan - On
– Supply Fan IGV / Supply Fan
VFD - Open/Max (if so
equipped)
– Exhaust Fan - On; Exhaust
Dampers Open (if so
equipped)
– OA Dampers - Open; Return
Damper - Closed
– Heat - All heat stages off;
Mod Heat output at 0 vdc
– Occupied/Unoccupied/VAV
box output - Energized
– VOM Relay - Energized (if so
equipped)
– Preheat Output - Off
– Return Fan - On; Exhaust
Dampers - Open (if so
equipped)
Controls VAV and CV