Trane VariTrac VAV-SVN04A-EN Owner's manual

Installation/
Operation
Maintenance
Var i Tr ac™ Dampers
VAV-SV N0 4A-EN
June 2002

VAV-SVN04A-EN
©2002 American Standard, Inc. All rights reserved
These instructions do not cover all
variations in systems nor provide for
every possible contingency that may
arise at a jobsite installation.
INSPECTION:
Check carefully for any shipping
damage.This must be reported to and
claims made against the transportation
company immediately. Any missing
parts should be reported to your
supplier at once and replaced with
authorized parts only.
DAMPER DESCRIPTIONS
Round Dampers
Cylinder 18-gage galvanized–rolled
and seam welded
Damper 22-gage galvanized steel
Actuator Internal actuator w/
synchronous motor and
gear reduction is direct
coupled to the damper
shaft. It has a drive time of
57 seconds. Microswitches
stop the drive motor at the
full-open and full-closed
positions.
··
··
·Electrical Rating:
Power Supply—24 VAC (20
to 30 VAC) at 50/60 Hz
Transformer Sizing—2.0 VA
maximum at nominal
voltage, Class 2
Round Bypass Dampers
Size Shipping
Diameter (in.) Length (in.) Weight
6 12 11 lbs
8 12 12 lbs
10 16 17 lbs
12 16 18 lbs
Round Zone Dampers
Size Shipping
Diameter (in.) Length (in.) Weight
6 12 11 lbs
8 12 12 lbs
10 16 17 lbs
12 16 18 lbs
14 20 27 lbs
16 20 31 lbs
Rectangular Bypass Damper
Sheet metal box 24-gage galvanized
steel
Length 16"
Damper frame 13-gage galvanized
steel
Damper blades 16-gage galvanized
steel
Blade pin 3/8"
Rectangular Bypass Dampers
Size No. of Shipping
W" x H" Blades Weight
14 x 12 2 16 lbs
16 x 16 3 21 lbs
20 x 20 3 29 lbs
30 x 20 3 40 lbs
Rectangular Zone Damper
Sheet metal box 24-gage galvanized
steel
Length 16"
Damper frame 18-gage galvanized
steel
Damper blades 18-gage galvanized
steel
Gears ABS plastic
Blade pin 3/8"
Rectangular Zone Dampers
Size No. of Shipping
H" x W" Blades Weight
08 x 12 2 8 lbs
08 x 14 2 10 lbs
08 x 16 2 12 lbs
10 x 16 3 14 lbs
10 x 20 3 16 lbs
14 x 18 4 18 lbs
Rectangular Actuator
Specification:
··
··
·Actuator Design:
3 Wire 18 ga 24 VAC Floating Point
Control, Non-spring return
··
··
·Actuator Housing:
HousingType—NEMA 1, IP20
··
··
·Rotation Range:
Adjustable from 30°–90°, clockwise or
counterclockwise
··
··
·Electrical Rating:
Power Supply—24 VAC (20 to 30 VAC)
at 50/60 Hz
Transformer Sizing—2.5 VA maximum
at nominal voltage, Class 2
··
··
·Manual Override:
External release lever
··
··
·Humidity:
90% RH maximum, non-condensing
··
··
·Temperature Rating:
Ambient – 35°–125°F (2°–52°C)
Shipping and Storage: -20°–150°F
(-29°–66°C)
··
··
·To r qu e :
Running: 35 lb-in (4 N-m)
Breakaway: 35 lb-in (4 N-m) minimum
Stall: 40 lb-in (4.5 N-m)
minimum
··
··
·RunningTime for 90° Rotation:
60 seconds at 60 Hz nominal
72 seconds at 50 Hz nominal
··
··
·Weight:
1.5 lb (0.68 kg)
General

3
VAV-SVN04A-EN
General
Install Bypass Dampers
Bypass damper(s) should be located
before the first zone runs out from the
supply air duct. VariTrac dampers or
supply duct branches should be
installed downstream of bypass
dampers.The distance between
bypass dampers and the communicat-
ing sensor/bypass control should be
two to three equivalent duct diameters
(see Figure 1).
In systems with plenum return, bypass
damper(s) should be ducted into the
return air riser. Confirm that sufficient
relief or exhaust exists to prevent
return plenum pressurization.
IMPORTANT:
The use of a relief fan or backdraft
damper is strongly recommended in
the return air system.This will prevent
bypassed air from pressurizing the
return air duct system and spilling out
of return grills into conditioned space,
especially when the unit is in econo-
mizer mode.
Bypass DamperWiring
The interconnect cable is pre-wired to
the bypass damper and may be
lengthened if necessary.
IMPORTANT:
Mounting screws must be located
towards the ends of the damper when
hanging straps are used to avoid
interference with the rotating damper.
A label attached to the dampers
indicates the acceptable areas for
mounting screws.
CAUTION
Equipment Damage!
The bypass damper must be
positioned to orient the drive shaft
horizontally. Failure to do this may
result in drive train malfunction (see
Figure 1).
IMPORTANT:
It is important to note the airflow
direction when installing dampers. A
label for this is present on each damper
assembly.
Voyager
Micro
Control
Heating and
Cooling Coils
Bypass
Damper Return
Air
Duct
Ductwork
Figure 1: Bypass Damper Installation

VAV-SVN04A-EN
Address
Switch DDC/UCM
Control Board
Shielded Twisted Pair
Communications Wiring
To NEC Class 2
24V Transformer
Load 8 VA (without actuator)
Female plug end of bypass
sensor assembly cable
Male plug end located on
DDC/UCM control board
DDC/UCM
Control Board
Step 3
Step 1
CLOSE
OPEN
HOT
ACTUATOR
SPARE
CONNECTOR
W–HOT
BK–OPEN
R–CLOSE
J11
J10
J9
J7
JB
TB4-1
TB2-1
TB1-1
TB2-1
TB2-2
TB2-3
TB2-4
TB2-5
TB2-6
YEL GRN
24VAC
J1 1
ACT BIP GND 24V
J3
S
1
TB3-1
TB3-2
TB3-3
TB3-5
TB3-6
ZONE GND GND
SET A/CO2
IN
IN
OUT
OUT
WH
BK
R
ACT
Step 2
IMPORTANT
The sensor assembly should be
installed on the side of the duct to keep
the pressure transducer in a vertical
orientation. Do not install horizontally
on the top or bottom of a duct.
Connect the
CommunicatingSensor/
Bypass Control Wiring
The pre-wired interconnect cable plugs
into the actuator connector inside the
control box.The cable is designed to
connect in one orientation only.
Installing the Communicating
Sensor/Bypass Control
The communicating sensor/bypass
control is located between the supply
fan and the bypass damper in the least
turbulent location possible. It is recom-
mended that the distance between the
control and the nearest upstream
transition be two to three equivalent
duct diameters.
Figure 2: Install the Communicating Sensor/Bypass Control
Installation
4
NOTES:
Step 1. Plug the actuator connector from the BYPS
damper onto the master damper UCM
socket (ACT).
Step 2. If two bypass dampers are used, connect the
actuator plug of the second bypass damper
to the spare connector socket pigtailed on the
first BYPS damper cable assembly.
Step 3. If the cable assembly needs to be extended,
cut and splice additional wire on the BYPS
damper end of the cable.
If the supply duct branches out at the
riser, install the control in the largest
supply duct.
A two-inch hole is required to insert the
temperature and static pressure
sensor. Use the supplied gasket to seal
off air leaks. Secure the sensor to the
duct with a minimum of three sheet
metal screws.

5
VAV-SVN04A-EN
Installation
Install theVariTrac Dampers
A sketch of basic damper installation is
shown in Figure 3.The damper may be
connected with hard duct or flex duct at
either end.
If two bypass dampers are installed, a
pigtail socket is provided on the cable so
the second damper can be plugged into
the UCM.
IMPORTANT
Mounting screws must be located towards
the ends of the damper when hanging
straps are used to avoid interference with
the rotating damper. A label attached to the
dampers indicates the acceptable areas for
mounting screws.
IMPORTANT
It is important to note airflow direction
when installing the damper. A label for this
is present on each damper assembly.
Figure 3: VariTrac Damper Installation
Attach unit to hard duct using
a minimum of four
sheet metal screws
Attach unit to hard duct using
a minimum of four
sheet metal screws
Attach unit to hard duct using
a minimum of four
sheet metal screws
Attach unit to hard duct using
a minimum of four
sheet metal screws
Attach flex duct to unit using
self-locking plastic tie strap
located ¼" past the crimp
IMPORTANT:
Mounting screws must be
3" away from damper bend
to avoid interference with
rotating damper.
Hard or Flex
Duct
Hard or Flex
Duct
Hard or Flex
Duct
Hard or Flex
Duct
Figure 4: Proper Damper Mounting Positions
CAUTION
Equipment Damage!
The control box on each damper must be
positioned to orient the drive shaft
horizontally. Failure to do this may result
in drive train malfunction. (See Figure 4.)

VAV-SVN04A-EN
WARNING
Equipment Damage!
Connecting a shared UCM power supply with reversed polarity will cause
damage to the UCM,TCI, and central control panel.
WARNING
Equipment Damage!
When powering multiple UCMs from one transformer, polarity must be
maintained.TerminalTB1-1 is designated positive (+) andTerminalTB1-2 is
negative (–) to unit casing ground.
IMPORTANT:
UCM control box cover must be replaced after field wiring to prevent electromag-
netic interference.
Connect UCMWiring
Connect the power to terminalsTB1-1
(24V) andTB1-2 (ground). 24 Vac is
required to power the UCM control.
20 Vac to 28 Vac is acceptable. Use
18 to 20 AWG for power wiring.
The power consumption for an auto-
changeover cooling-only UCM (model
CHGR) is 10VA.
Local heat outputs are rated at 12VA
maximum for each output.To determine
the total UCM power requirements, add
the power consumption of local heat to
the circuit board power.
CAUTION
Use Copper Conductors Only!
Unit terminals are not designed to
accept other types of conductors.
Failure to use copper condutors may
result in equipment damage.
Installation
6
DIP Switch Settings
Dip switch SW1 contains six switches for addressing the UCM.
These switches allow a user to set a unique communication
address for each UCM. Each UCM on a given communication
link must have a unique address in order for the CCP to
communicate to it. Refer toTable 1 for UCM 4.1 DIP switch
settings.
Table 1—DIP Switch Settings
UCM
Unit # Dip 1 Dip 2 Dip 3 Dip 4 Dip 5 Dip 6
1OFF ON ON ON ON ON
2ON OFF ON ON ON ON
3OFF OFF ON ON ON ON
4ON ON OFF ON ON ON
5OFF ON OFF ON ON ON
6ON OFF OFF ON ON ON
7OFF OFF OFF ON ON ON
8ON ON ON OFF ON ON
9OFF ON ON OFF ON ON
10 ON OFF ON OFF ON ON
11 OFF OFF ON OFF ON ON
12 ON ON OFF OFF ON ON
13 OFF ON OFF OFF ON ON
14 ON OFF OFF OFF ON ON
15 OFF OFF OFF OFF ON ON
16 ON ON ON ON OFF ON
17 OFF ON ON ON OFF ON
18 ON OFF ON ON OFF ON
19 OFF OFF ON ON OFF ON
20 ON ON OFF ON OFF ON
21 OFF ON OFF ON OFF ON
22 ON OFF OFF ON OFF ON
23 OFF OFF OFF ON OFF ON
24 ON ON ON OFF OFF ON
*33 OFF ON ON ON ON OFF
*Bypass damper must always be addressed at 33.

7
VAV-SVN04A-EN
Damper
Actuator
Wiring
To 24V
Transformer
8.
BL–HOT
BK–OPEN
R–CLOSE
BIP GND 24V
J11
J10
J9
J7
J8
J1
TB4–1
1
TB1–2
TB1–1
ADDRESS
SWITCH D.D.C.\U.C.M.
CONTROL BOARD
TB2–1
TB2–2
TB2–3
TB2–4
TB2–5
TB2–6
TB3–1
TB3–2
TB3–3
TB3–5
TB3–6
J3
YEL GRN
ZONE GND SET GND
S
1
IN
IN
OUT
OUT
D.D.C. U.C.M
CONTROL BOX
9.
SHIELDED
TWISTED PAIR
COMMUNICATIONS
WIRING
TB2-5
TB2-6
TB3-3
TB3-2
TB3-1 TB3-1
TB3-2
ZONE SENSOR
REMOTE MTD.
ZONE SENSOR
W/ COMM. JACK
REMOTE MTD.
5 4 3 2 1
3. 4. 4.
21
OPTIONAL FIELD
INSTALLED ZONE SENSOR
OPTIONAL FIELD
INSTALLED ZONE SENSOR
OPTIONAL FIELD INSTALLED
ON-OFF WATER VALVE
OPTIONAL FIELD INSTALLED
AUX TEMP SENSOR
TO J9
TO J8
ON –OFF
WATER VALVE
24 VAC
12VA MAX
6.
TB3-6
TB3-5
OPTIONAL FIELD INSTALLED
PROPORTIONAL WATER VALVE
PROP.
WATER
VALVE
24VAC
12VA MAX
HEATER STAGE
CONTACTOR(S)
24VAC, 12VA
MAX/COIL
OPTIONAL FIELD INSTALLED
ELECTRIC HEATER
TO J8
TO J8
TO J9
TO J9
TO J10
TO J10
TO J11
3RD STG.
2ND STG.
1ST STG.
HOT
W (HOT)
BK (CLOSE)
R (OPEN)
NOTE:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Factory wiring
Field wiring
Optional or alternate wiring
¼" quick connect required for all field connections.
Zone sensor terminals 4 and 5 require shielded twisted pair wiring for
communications jack equipped zone sensor option.
No additional wiring required for night setback override (on/cancel).
The optional binary input connects between TB4-1 (BIP) and 24VAC (hot) from
transformer. The binary input can be reconfigured as an occupancy input via the
communications interface.
As shipped, the AUX input is configured as an AUX input. The AUX input can be
reconfigured as a CO2 sensor input via the communications interface.
S terminal not to be used with VariTrane.
If unit mounted transformer is not provided, polarity from unit to unit must be
maintained to prevent permanent damage to control board. If one leg of 24VAC
supply is grounded. then ground leg must be connected to TB1-2.
Shields of communications wiring should be tied together and insulated.
5.
R (HOT)
O (COMMON)
GR (NC CONTACT)
BK (RETURN)
Y
(TB1-1) 24 VAC)
(TB4-1) BIP
(TB1-1) 24VAC
(TB1-2) GND
NOT CONNECTED
OPTIONAL FIELD INSTALLED
OCCUPANCY SENSOR
6.
(TB1-1) 24V
(TB3-6) GND
(TB3-5) A/CO2
CO2
SENSOR
24V
GND
OUT
OPTIONAL FIELD INSTALLED
CO2 SENSOR
ACTUATOR
A/CO2
Installation

VAV-SVN04A-EN
Trane
An American Standard Company
www.trane.com
For more information contact
your local district office or
e-mail us at [email protected]
Literature Order Number VAV-SVN04A-EN
File Number SL-TD-VAV-000-SVN04A-EN-0602
Supersedes VAV-CS-12A
Stocking Location La Crosse
Trane has a policy of continuous product and product data improvement and reserves the right to change design
and specifications without notice. Only qualified technicians should perform the installation and servicing of
equipment referred to in this publication.