Tjernlund VSUB Series Universal Blowers for Combustion Air or Draft 8504114 - Manual (Page 9)

8
MOUNTING ON FLOOR
1. Make sure the surface you plan to mount the VSUB Blower on is level.
2. When mounting on the floor we recommend using anti-vibration floor mounts, springs or pads.
3. Make sure anti-vibration floor mounts, springs or pads are rated to handle the weight of the
VSUB Blower you are installing.
4. Fasten the floor mount, springs or pads to the bottom frame of the VSUB Blower.
5. Secure the VSUB Blower to the floor to ensure that is doesn't move during operation.
PSA-1 FAN PROVING SWITCH FOR ADJUSTABLE-FIXED SPEED MECHANICAL DRAFT INDUCER INSTALLATIONS
The PSA-1 is a field adjustable pressure switch
that is the primary fan prover for VSUB Blowers
not installed in conjunction with a CPC-2 con-
troller, and the manual operation mode fan
prover for installations incorporating a CPC-2
controller.
1. Install Fan Proving Switch sampling tube in
the vent connector as close as possible to
VSUB inlet and 2-3 pipe diameters away from
any elbow or “T”. For multiple appliances vent-
ing into a common manifold, install after appli-
ance closest to the VSUB Blower. If the
vent run is completely vertical, install after
draft hood or barometric damper, (See
Diagram E).
2. Drill 1/4" hole for Fan Proving Switch sampling
tube. The hole should be burr free. Secure
sampling tube bracket to pipe with sampling
hole centered.
3. Insert stainless steel sampling tube through
1/4" hole enough to just penetrate interior of
vent pipe and lock in place with compression
nut, (See Diagram F). With the VSUB Blower
on, a negative pressure reading on a draft
gauge is an indication that the interior of the
pipe has been penetrated.
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 (LOW). 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 read-
ing, (See Diagram G).
PSA-1 FAN PROVING SWITCH FOR ADJUSTABLE-FIXED SPEED COMBUSTION AIR INTAKE INSTALLATIONS
The PSA-1 is a field adjustable pressure switch that is the primary fan prover for VSUB Blowers not
installed in conjunction with a CPC-2 controller, and the manual operation mode fan prover for installa-
tions incorporating a CPC-2 controller.
1 Install Fan Proving Switch sampling tube in the DISCHARGE/OUTLET duct as close as possible to
the outlet collar of the VSUB Blower. Directly after the VSUB Blower outlet collar the pressure will be
greatest at the point in line with the top of the scroll blower housing, (See Diagram H). If VSUB
Blower is mounted outside install sampling tube on closest indoor section of duct.
2 Drill 1/4" hole for Fan Proving Switch sampling tube. Insert sampling tube with 90° bend so that the
short side faces directly towards the VSUB discharge/outlet. Secure sampling tube bracket to pipe
with sampling hole centered. With all pipe connected, start VSUB Blower and adjust tube until a
high pressure reading is available, (at least +0.10” w.c.)
OR
VSUB-SERIES
IN VERTICAL OR
HORIZONTAL
TERMINATION
APPLIANCE
GAS APPLIANCE DRAFT
SAMPLE LOCATION
(MUST BE MOUNTED
SIX FEET OF SENSING
VERTICALLY WITHIN
FAN PROVING SWITCH
FIGURE CPE98 3/2/04
LOCATION)
FLAME RETENTION
OIL BURNERS
OVER-FIRE DRAFT
TJERNLUND ABD-SERIES
BALANCING BAFFLE
(IF BAFFLE IS INSTALLED
IT MUST BE POSITIONED
AFTER FAN PROVING SWITCH)
DRAFT CONTROL
/ DRAFT HOOD
DIAGRAM E
DIAGRAM F
1/4” STAINLESS STEEL
SAMPLING TUBE BEND MUST
FACE UPWARD
COMPRESSION FERRULE
COMPRESSION NUT
SAMPLING PORT CENTERED
OVER 1/4” HOLE
DIAGRAM G
FAN PROVING SWITCH MUST
BE MOUNTED WITHIN SIX
FEET OF SAMPLING TUBE.
SWITCH CAN BE ORIENTATED
IN A 360
O PLANE AS LONG AS
DIAPHRAGM IS IN A VERTICAL
ORIENTATION AND TUBING IS
NOT KINKED.
FACE SAMPLING
TUBE INTO AIR
STREAM
DIAGRAM H