Tjernlund Auto-Draft FSAD & VSAD Series Inducers 8504090 Rev 11/00 - Manual (Page 9)

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8. Seal around the Venter base and the Mounting Plate with hi-temp silicone. Make sure
it is watertight and no water can slip in between the Venter base and Mounting Plate.
Drain holes on (6) corners of Venter base can be sealed to prevent staining of the
building, (See Diagram D).
9. Apply a bead of hi-temp silicone on the cooling air inlet on top of Auto-Draft® and firmly
adhere triangle shaped cooling air inlet cover to cooling air inlet, (See Diagram H). This
procedure will prevent rain and/or snow from entering Venter.
PSA-1 FAN PROVING SWITCH INSTALLATION
1. Install Fan Proving Switch sampling tube in
the vent connector 2-3 pipe diameters after
the elbow or “T” that turns the vent from verti-
cal to horizontal. For multiple appliances vent-
ing into a common manifold, install after appli-
ance closest to Auto-Draft® Venter. If the vent
run is completely vertical, install after draft
hood or barometric, (See Diagram I).
2. Drill 1/4” hole for Fan Proving Switch sampling
tube. 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 J). With the Auto-Draft
Venter on, a reading with a draft gauge
can be used to determine when interior of
pipe has been penetrated.
4. Fan Proving Switch diaphragm must be mount-
ed in a vertical position within six feet of the
sensing location. Firmly insert flexible tubing
on sampling tube and Fan Proving Switch nip-
ple marked (LOW). Leave other Fan Proving
Switch port open to room atmosphere. Make
sure there are no sharp bends or kinks in
flexible tubing, (See Diagram K).
WIRING
All wiring from the Auto-Draft® Venter to the appliance must be in compliance with the local codes or in
their absence, the National Electric Code (NFPA 70).
All wiring from the Auto-Draft® Venter to the appliance must be appropriate class 1 wiring as follows:
Installed in rigid metal conduit, intermediate metal conduit, rigid non-metallic conduit, electrical metallic
tubing, Type MI Cable or be otherwise suitably protected from physical damage.
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 or MAC-4 Multiple Appliance Controller are not covered by this manual. Please refer to those
accessory installation manuals.
All wiring with a VFD or CPC-2 control must be in metal conduit or shielded VFD rated cable.
DIAGRAM H
TOP
COOLING
AIR INLET
DIAGRAM I
DIAGRAM K DIAGRAM J
1/4” STAINLESS STEEL
SAMPLING TUBE BEND MUST
FACE UPWARD
COMPRESSION FERRULE
COMPRESSION NUT
SAMPLING PORT CENTERED
OVER 1/4” HOLE
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.
IMPORTANT: Impeller must
rotate counter-clockwise.
Follow rotation confirmation
procedure for VSAD-Series.