Diagram i – Tjernlund VSUB Series Universal Blowers for Combustion Air or Draft 8504114 User Manual
Page 10
9
3. Lock in place with compression nut. With the VSUB Blower on, a positive pressure reading on a draft gauge is an indication that
the tube has been orientated properly.
4. Fan Proving Switch diaphragm must be mounted in a VERTICAL position within six feet of the sensing location. Firmly insert flexi-
ble tubing on sampling tube and Fan Proving Switch fitting marked (HIGH). Leave the other Fan Proving Switch port open to room
atmosphere for reference. Make sure there are no sharp bends or kinks in flexible tubing. Do not mount the PSA-1 so that is direct-
ly in the path of the VSUB Blower discharge, unit heater or duct discharges. Doing so may cause a false reference pressure reading.
WIRING
All wiring from the VSUB Blower to the appliance must be in compliance with local codes or in their absence, the National Electric
Code (NFPA 70).
All wiring from the VSUB Blower to the appliance must be appropriate class 1 wiring as follows: Installed in rigid metal conduit, inter-
mediate metal conduit, rigid non-metallic conduit, electrical metallic tubing, Type M1 cable or be otherwise suitably protected from
physical damage.
IMPORTANT:
All wiring from the VFD Variable Frequency Drive or CPC-2 constant Pressure Controller must be in metal conduit or shield-
ed cable where appropriate. Do not route these wires with any other wires. Improper system operation could result.
This installation manual does not contain any system design documentation. Installation and use of Tjernlund controls like the CPC-2
Constant Pressure controller, EXP-4 Appliance Interlock Expansion Boards, VFD-Series Variable Frequency Drives, UC1 Universal
Control, TD-2/TD-3 Pressure Transducer or MAC1E and MAC4E Multiple Appliance Controls are not covered by this manual. Please
refer to those accessory installation manuals.
WIRING VSUB MOTOR FOR PROPER VOLTAGE
IMPORTANT: CONFIRM PROPER IMPELLER ROTATION
If this VSUB Blower is being installed in conjunction with a CPC-2 Controller, follow impeller rotation check instructions outlined in the
CPC-2 installation instructions. Failure to insure correct rotation will result in higher power usage and poor blower performance.
All VSUB Blowers must use a Variable Frequency Drive (VFD) supplied by Tjernlund which is factory programmed specifically for the
VSUB model being installed.
VISUAL METHOD TO VERIFY PROPER ROTATION:
VSUB Series impeller must rotate counter-clockwise as viewed from the motor side, (See Diagram I). Verify motor cooling fan at back
of motor rotates counter-clockwise. While the VSUB Blower is running at a slow speed, starting up or coming to a stop, visually deter-
mine if the rotation is correct. Perform step 4 on page 10 if rotation is in the reverse direction.
MOTOR
WINDINGS
MOTOR
LIMIT
GROUND
P1
P2
BLACK
BLACK
BLACK
BLUE
ORANGE
GREEN
BLACK
BLACK
BLACK
BLUE
ORANGE
GREEN
VSUB MOTOR
4 x 4 WEATHERPROOF BOX
FLEXIBLE CONDUIT
WIRE NUTS BY INSTALLER
FACTORY CONNECTORS
IMPORTANT:
T4
T7
T1
T5
T8
T2
T6
T9
T3
BLACK
BLACK
BLACK
T4
T1
T5
T6
BLACK
BLACK
BLACK
T7
T2
T8
T3
T9
MOTOR WIRING
460 VOLT VFD
MOTOR WIRING
230 VOLT VFD
(FACTORY WIRING)
FIGURE 8055001 4/5/04
RED
RED
RED
RED
H2
H1
ARCTIC-DUTY
230 VAC OR 460 VAC
5 VDC BOARD-GENERATED
DO NOT SUPPLY POWER!
230 VAC
LEGEND:
POWER.
MOTOR HEATER
(15 WATTS FOR VSUB8,12,16
MOTOR HEATER T-STAT
460 VAC
BELOW FREEZING.
& 30 WATTS FOR VSUB20)
VSUB ROTATION 2/27/04
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DIAGRAM I