Controls
For all VariTrane units, the unit
controller continuously monitors the
zone temperature and varies the
primary airflow as required to meet
zone setpoints. Airflow is limited by
adjustable minimum and maximum
setpoints.
Additionally, for series fan-powered
units, the controller will start and run the
fan continuously during the occupied
mode and intermittently during the
unoccupied mode. Upon a further call
for heat, any hot water or electric heat
associated with the unit is enabled.
For parallel fan-powered units, the
controller energizes the fan upon a call
for heat. Upon a further call for heat,
reheat is enabled.
FAN SPEED CONTROL
Variable Speed Control Switch
(SCR)—The SCR speed control device
is standard on all fan-powered units.
The SCR adjusts the fanspeed and
provides simplified system balancing.
DIRECT DIGITAL CONTROLS (DDC)
LonMark Direct Digital Controller—
Trane-designed LonMark certified
controller uses the space comfort
control (SCC) profile to exchange
information over a LonTalk Network.
LonMark networks provide the latest
open protocol technology
Direct Digital Controller—The
microprocessor-based terminal
unit controller provides accurate,
pressure-independent control through
the use of a proportional integral control
algorithm and direct digital control
technology. The UCM, monitors zone
temperature setpoints, zone
temperature, the rate of temperature
change, and valve airflow. With the
addition of optional sensors, room
occupancy or supply duct air
temperature can be monitored. The
controller is provided in an enclosure
with 7/8" (22 mm) knockouts for remote
control wiring. ATrane DDC zone sensor
is required.
DDC Actuator—Trane 3-wire, 18gage, 24-VAC, floating-point control
actuator with linkage release button.
Torque is 35 in.-lb minimum and is
non-spring return with a 90-second
drive time. Travel is terminated by end
stops at fully opened and closed
positions. An integral magnetic clutch
eliminates motor stall.
DDC Zone Sensor—The UCM
controller measures zone temperature
through a sensing element located in
the zone sensor. Other zone sensor
C 64
options may include an externallyadjustable setpoint, communications
jack for use with a portable service tool,
and an override button to change the
individual controller from unoccupied to
occupied mode. The override button has
a cancel feature that will return the
system to unoccupied. Wired zone
sensors utilize a thermistor to vary the
voltage output in response to changes
in the zone temperature. Wiring to the
UCM controller must be 18 to 22 awg.
twisted pair wiring. The setpoint
adjustment range is 50–88ºF (10–31°C)
Depending upon the features available
in the model of sensor selected, the
zone sensor may require from a 2-wire
to a 7-wire connection. Wireless zone
sensors report the same zone
information as wired zone sensors, but
do so using radio transmitter
technology. No wiring from the zone
sensor to the UCM controller is
necessary.
Digital Display Zone Sensor with
Liquid Crystal Display (LCD)—
The direct digital zone sensor contains a
sensing element which sends a signal to
the UCM. A Liquid Crystal Display (LCD)
indicates setpoint, or space
temperature. Sensor buttons allow
setpoint adjust, and allow space
temperature readings to be turned on or
off. The digital display zone sensor also
includes a communication jack, for use
with a portable edit device, and an
override button to change the UCM
from unoccupied to occupied. The
override button has a cancel feature,
which returns the system to unoccupied
mode.
The digital display zone sensor requires
seven wires, one for 24-VAC power.
System Communications—The
Controller UCM sends and receives data
from a Tracer Summit or other Trane
Controller. Current unit status and
setpoints may be monitored and/or
edited via this data communication
feature. The network type is a twisted
wire pair shielded serial
communication.
The following direct digital control
features are available with VariTrane
terminal units:
y Controls Option – DD00: Trane actuator
for field-installed DDC controllers
y Controls Option – DD01: Cooling Only
(DDC/UCM)
y Controls Option – DD02: Cooling with
Normally-Closed On/Off hot water valve
(Normally-Open outputs) (DDC/UCM)
Specifications
y Controls Option – DD03: Cooling with
proportional hot water valve with
optional spare On/Off Output)
(DDC/UCM)
y Controls Option – DD04: Cooling with
staged On/Off electric heat (DDC/UCM)
y Controls Option – DD05: Cooling with
pulse-width modulation electric heat
(DDC/UCM)
y Controls Option – DD07: Cooling with
Normally-Open On/Off hot water valve
(Normally-Closed outputs) (DDC/UCM)
y Controls Option – DD08: Cooling and
Heating - Dual-Duct Constant Volume
(DDC/UCM)
y Controls Option – FM00: Factory
installation of customer supplied
actuator and DDC controls. Controls
supplier is responsible for providing
factory-installation and wiring
instructions.
y Controls Option – FM01: Trane actuator
with factory installation of customer
supplied DDC controls. Controls supplier
is responsible for installing and wiring
instructions.
y Controls Option – ENON: Shaft only for
field-installation of customer-supplied
actuator and controls.
The following override commands may
be received by the Unit Control Module
(UCM) from the Tracer Summit or other
Trane Controllers.
y Control Mode –The UCM Control Mode
may be edited from occupied to
unoccupied to accommodate night
setback/setup.
y Control Action –The Control Action may
be edited from cooling to heating,
changing the primary air damper to a
heating source. This will accommodate
a cooling/heating changeover system.
y Control Offset – Enabling Control Offset
will increase the cooling temperature
setpoint and decrease the heating
temperature setpoint by a control-offset
value (Stored at limiting in the
occupied mode).
y Drive damper fully open
y Drive damper fully closed
y Drive damper to maximum airflow
setpoint
y Drive damper to minimum airflow
setpoint
y Disable unit heat
y Reset-Enabling the reset function forces
the controller and the flow sensor to
recalibrate
y Programmable hot water valve
drive time
y Programmable air damper drive time
VAV-PRC008-EN
Controls
The following unit setpoints reside in
the UCM in nonvolatile memory.These
setpoints are editable from the Tracer
via the communications link.
y Occupied cooling temperature setpoint
(60–80ºF (15–26°C))
y Occupied heating temperature setpoint
(60–80ºF (15–26°C))
y Unoccupied cooling temperature
setpoint (60–100ºF (15–37°C))
y Unoccupied heating temperature
setpoint (30–100ºF (15–37°C))
y Minimum cooling flow setpoint
(0, 10–110% of unit equivalent
nominal airflow)
y Minimum heating flow setpoint
(0, 10–110% of unit equivalent
nominal airflow)
y Maximum flow setpoint (0, 50–100% of
unit equivalent nominal airflow)
y Fan Control Offset – This determines at
what operating point the fan in a
parallel fan-powered unit is energized.
This can be specified as a function of
temperature, degrees above heating
setpoint, or primary airflow (0–10°F
(-17–12°C) or 0,10–100% of unit
equivalent nominal airflow).
y Heating Setpoint Offset – This
determines at what point the first stage
of reheat turns on. Expressed in
degrees below cooling setpoint. (Only
applicable when local thumbwheel
is enabled.)
y Zone temperature, auxiliary
temperature, and zone setpoint
calibration corrections (adjustable from
+/-10.0ºF (+/- -12°C)).
y Flow measurement calibration
correction (50–150%)
y Cooling Setpoint Low Limit – Applies
low limit to programmed occupied
cooling setpoint or zone sensor cooling
setpoint (30–100°F (-1–37°C)).
y Heating Setpoint High Limit – Applies
high limit to programmed occupied
heating setpoint or zone sensor
heating setpoint (30–100ºF (-1–37°C)).
y RTD / Thermistor – Determines what
type of zone temperature sensor will
be used.
y Occupied and Unoccupied Outside Air
Requirements – Determines the
percent of outdoor air required in the
zone for air quality requirements.
y Series Fan Configuration – allows
option of series fan-powered box to
shut off fan and close air valve when
unit is unoccupied. Fan will operate in
unoccupied mode if reheat is active.
y Heating setpoint low limit.
VAV-PRC008-EN
y Cooling setpoint high limit.
y Local heating flow setpoint enable/
disable and setpoint.
y Auxiliary analog input mode select for
either auxiliary temperature sensor or
CO2 detector.
y Binary input mode select for either
generic or occupancy detector.
In addition to the above setpoints, the
following status information can be
transmitted to the Tracer Summit or
other Trane Controllers.
y Active cooling temperature setpoint
y Active heating temperature setpoint
y Current unit primary airflow
y Current zone temperature
y Re-heat status (On/Off)
y Auxiliary Air Temperature – Available
only if the unit has an auxiliary
temperature sensor.
y Failure Indicators – The UCM will
indicate the following:
Temperature Sensor Failure
Flow Sensor Failure
Local Zone Sensor Setpoint Failure
y Ventilation Ratio
y Fan Status (on/off)
y Calibration Status (calibration/notcalibrating)
y BIP state
y CO2 Concentration—Available only if
the unit has an auxiliary CO2 sensor.
This mode and auxiliary air
temperature are mutually exclusive.
ANALOG (Non-Communicating)
Analog Controller—The controller
consists of a circuit board that offers
basic VAV unit operation and additional
override functions and operates using
24-VAC power. The controller uses a
capacitive type pressure transducer to
maintain consistent air delivery
regardless of system pressure changes
in an enclosure with 7/8" (22 mm)
knockouts for remote control wiring.
A Trane electronic zone sensor is
required.
Analog Actuator—ATrane 3-wire,
18-gage, 24-VAC, floating-point control
actuator with linkage release button.
Torque is 35 in.-lb minimum and is
non-spring return with a 90-second
drive time. Travel is terminated by end
stops at fully-opened and -closed
positions. An integral magnetic clutch
eliminates motor stall.
Analog Thermostat—This singletemperature, wall-mounted electronic
device utilizes a thermistor to vary the
voltage output in response to changes
in the zone temperature. Connections
Specifications
to the VAV unit circuit board are made
using standard three-conductor
thermostat wire. The setpoint
adjustment range is 63–85ºF. (17–29°C)
The sensor is available in two models.
One model has a concealed, internallyadjustable setpoint. The other model
has an externally-adjustable setpoint.
The following analog electronic control
features are available with VariTrane
terminal units:
y Controls Option—EI05: Cooling with
remote or unit installed reheat
y Controls Option—EI28: Cooling with
remote or unit-installed reheat–Auto
Dual Minimum
y Controls Option—EI29: Cooling with
remote or unit-installed reheat–
Constant-Volume
y Controls Option–EI71: Cooling with
remote or unit-installed reheat–Duct
Pressure Switch
y Controls Option—ENON: Shaft only for
field-installation of actuator and DDC
controls
PNEUMATIC CONTROLS
Normally-Open Actuator—
Pneumatic 3 to 8 psig (20 to 55 kPa)
spring-range pneumatic actuator.
Normally-Closed Actuator—
Pneumatic 8 to 13 psig (55 to 90 kPa)
spring-range pneumatic actuator.
3011 Pneumatic Volume Regulator
(PVR)—The regulator is a thermostat
reset velocity controller, which
provides consistent air delivery within
5% of cataloged flow down to 15% of
unit cataloged cfm, independent of
changes in system static pressure.
Factory-calibrated, field-adjustable
setpoints for minimum and maximum
flows. Average total unit bleed rate,
excluding thermostat, is 28.8 scim at
20 psig (7.87 ml/min at 138 kPa) supply.
3501 Pneumatic Volume Regulator
(PVR) —The 3501 regulator is a linearreset volume controller.This PVR is
used to maintain a constant volume of
airflow from the dual-duct unit when
constant volume control is used.
Average total unit bleed rate, excluding
thermostat, is 43.2 scim at 20 psig
(11.8 mL/min at 138 kPa) supply.
Considerations for Pneumatic
Thermostat—Field-supplied and
-installed based on chosen control
options, a direct-acting or a reverseacting, one-pipe or two-pipe
pneumatic room thermostat will
control the available air valve, reheat
and fan switch to maintain room
temperature setpoint.
C 65
Controls
The following pneumatic control
features are available with VariTrane
terminal units:
y Controls Option – PN00: Cooling with
Normally-Open damper and actuator
only (Reverse-ActingThermostat)
y Controls Option – PN04: Cooling with
hot water reheat, Normally-Open
damper, 3011 PVR (Direct-Acting
Thermostat)
y Controls Option – PN05: Cooling with
electric reheat, Normally-Open
damper, 3011 PVR (Reverse-Acting
Thermostat)
y Controls Option – PN08: Cooling and
Heating, Normally-Open dampers,
actuators only (Reverse-Acting
Thermostat)
y Controls Option – PN09: Cooling and
Heating, Normally-Open dampers,
3011 PVR’s (Direct-ActingThermostat)
y Controls Option – PN10: Cooling and
Heating, Normally-Open dampers,
3501 PVR’s, Dual-Duct Constant Volume
(Direct-ActingThermostat)
y Controls Option – PN11: Cooling with
hot water reheat, Normally-Open
damper, 3011 PVR - Auto Dual
Minimum (Direct-ActingThermostat)
(N.O. Water Valve)
y Controls Option – PN32: Cooling with
hot water reheat, Normally-Open
damper, 3011 PVR - Constant Volume
(Direct-ActingThermostat)
y Controls Option – PN34: Cooling with
electric reheat, Normally-Open
damper, 3011 PVR - Constant Volume
(Reverse-Acting Thermostat)
y Controls Option – PN51: Cooling with
reheat, Normally-Open damper, 3011
PVR Duct Pressure Switch (ReverseActingThermostat)
y Controls Option – PN52: Cooling with
reheat, Normally-Open damper, 3011
PVR - Dual Pressure Minimum
(Reverse-Acting Thermostat)
y Controls Option – PC00: Cooling Only
with Normally-Closed damper - DirectActingThermostat
y Controls Option – PC03: Cooling and
Heating, Normally-Closed heating
damper, Normally-Open cooling
damper, actuators only - Direct-Acting
Thermostat
C 66
y Controls Option – PC04: Cooling with
hot water reheat, Normally-Closed
damper, 3011 PVR - Direct-Acting
Thermostat
y Controls Option – PC05: Cooling with
electric reheat, Normally-Closed
damper, 3011 PVR - Reverse-Acting
Thermostat
OPTIONS
Power Fuse (cooling only and hot
water units, and VDDF)—An optional
fuse is factory-installed in the primary
voltage hot leg.
Transformer (Standard on fanpowered, optional on VCCF, VCWF,
VDDF)—The 50-VA transformer is
factory-wired and installed in an
enclosure with 7/8" (22 mm) knockouts
to provide 24 VAC for controls.
Wireless Zone Sensor/Receiver—
Factory mounted Receiver with field
mounted Sensor accessory elimintes
the need for the wiring between the
zone sensor and unit level controller.
See specifications on Page C67.
Disconnect Switch (Optional on
VCCF, VCWF, VDDF)—Disengages
power.
HOT WATER VALVES
Two-Position Valve—The valve is a
field-adaptable for 2-way or 3-way
piping arrangements. All connections
are National PipeThread (NPT).The
valve body is forged brass with a
stainless steel stem and spring. Upon
demand, the motor strokes the valve.
When the actuator drive stops, a spring
returns the valve to its fail-safe position.
Flow Capacity – 1.17 Cv,
Overall Diameter – ½" NPT
Close-Off Pressure – 30 psi (207kPa)
Flow Capacity – 3.0 Cv,
Overall Diameter – 3/4" NPT
Close-Off Pressure – 14.5 psi (100kPa)
Flow Capacity – 6.4 Cv
Overall Diameter – 1" NPT
Close Off Pressure – 9 psi (62kPa)
Maximum Operating Fluid
Temperature – 203oF (95oC)
Maximum System Pressure – 300 psi
(2067kPa)
Maximum Static Pressure – 300 psi
(2067kPa)
Specifications
Electrical Rating – 7 VA at 24 VAC, 6.5
Watts, 50/60Hz
8 feet (2.44 m) of plenum rated wire
lead is provided with each valve.
Proportional Water Valve—The
valve is a field-adaptable for 2-way or
3-way piping arrangement. The valve is
designed with an equal percentage
plug.The intended fluid is water or
water and glycol (50% maximum
glycol). The actuator is a synchronous
motor drive. The valve is driven to a
predetermined position by the UCM
controller using a proportional plus
integral control algorithm. If power is
removed, the valve stays in its last
position.The actuator is rated for
plenum applications under UL 94-5V
and UL 873 standards.
Pressure and Temperature Ratings –
The valve is designed and tested in full
compliance with ANSI B16.15 Class
250 pressure/temperature ratings,
ANSI B16.104 Class IV control shutoff
leakage, and ISA S75.11 flow
characteristic standards.
Flow Capacity – 7.30 Cv, 4.60 Cv, 1.80
Cv, and 0.79 Cv
Overall Diameter – ½" NPT, ¾" NPT
(7.30 Cv)
Maximum Allowable Pressure – 345 psi
(2415 kPa)
Maximum Operating Fluid
Temperature – 281oF (138oC)
Maximum Close-Off Pressure – 55 psi
(379 kPa)
Electrical Rating – 4 VA at 24 VAC
10 feet (3.05 m) of plenum rated
22-gage wire for connection.
Terminations are #6 stabs.
DDC RETROFIT KIT (VRTO)
The kit consists of aTrane DDC Unit
Control Module (UCM) VAV terminal
unit controller and a pressure
transducer installed in a metal
enclosure.The mechanical
specifications of accessories such as
DDC zone sensors, hot water valves,
and transformers are found elsewhere
in this section.
VAV-PRC008-EN
Controls
RETROFIT KIT OPTIONS
Flow Bar Sensor—The flow bar
sensor is a multiple-point, averaging,
pitot tube type flow sensor. It is
intended for field installation on
terminal units that have no flow
measurement device. The total and
static pressure outputs of the sensor
are field-piped to the high and low
inputs of the pressure transducer in the
retrofit kit.
Retrofit Kit Actuator—The electric
actuator is a direct-coupled type
actuator that utilizes three-wire,
floating-point control.The actuator is
field-installed to the damper shaft and
field-wired to the controller.
Trane Actuator – Actuator is rated at
4 VA at 24 VAC. Drive time is 90
seconds with 35 in.-lb (4 N-m).
Retrofit Actuator – Actuator is rated at
3 VA at 24 VAC. Drive time is 80 to 110
seconds for 0 to 35 in.-lb (0 to 4 N-m).
Other options available:
y DDC Zone Sensors
y 2-Position & Modulating Water Valves
y ControlTransformer (Ships loose with
mounting plate for 4x4 junction box)
y Auxiliary Temperature Sensor
y Zone Occupancy Sensors
y Co2 Sensors (Room- or duct-mounted)
Specifications
Wireless Zone Sensor Specifications
Sensor Operating Temperature
Receiver Operating Temperature
Storage Temperature
Storage and Operating Humidity Range
Accuracy
Resolution
Setpoint Functional Range
Setpoint Thumbwheel Markings
Receiver Voltage
Receiver Power Consumption
Housing
Mounting
Sensor Battery
Range1
Output Power
Radio Frequency
Radio Channels
Address Range
Minimum Time Between Transmissions
Maximum Time Between Transmissions
RoHS Compliance
32 to 122°F (0 to 50°C)
-40 to 158°F (-4 to 70°C)
-40 to 185°F (-4 to 85°C)
5% to 95%, non-condensing
0.5°F over a range of 55 to 85°F (12.8 to
29.4°C)
±0.125°F over a range of 60 to 80°F
(15.56 to 26.67°C) ±0.25°F when outside
this range
-45 to 95°F (7.22 to 35°C)
50 to 85°F (stamped every 5°F) and *,**
11 to 29°C (stamped every 3°C) and *,**
24V Nominal AC/DC ±10%
<1 VA
Polycarbonate/ABS blend, suitable for
plenum mounting, UV protected, UL 94:
5VA flammability rating
3.24 in. (82.55 mm) for 2 mounting
screws (supplied)
(2) AA, 1.5V, 2800 mAh, Lithium, 5-year
life
Open range—2,500 ft.
(packet error rate = 2%) (762 m)
Usable—200 ft (61 m)
Typical—75 ft. (25 m)
100 mW—North America
10mW—Outside North America
2.4 GHz (IEEE Std 802.15.4-2003
compliant)
(2405-2480 MHz, 5 MHz spacing
16
000-999
30 Seconds
15 Minutes
Yes
1 Range values are estimated transmission distances for satisfactory operation of the 100 mW version. Estimated transmission
distance for the 10 mW version will be less. Actual distance is job specific and must be determined during site evaluation.
Placement of the receiver and the sensor is critical to proper system operation. In most general office space installations,
distance is not the limiting factor for proper radio signal quality. It is more greatly affected by walls, barriers and general
clutter. In general, sheetrock walls and ceiling tiles offer little restriction to the propagation of the radio signal throughout the
building as opposed to concrete or metal barriers.
VAV-PRC008-EN
C 67