Tjernlund RT1500(H) Rooftop Inducers 8504160 Rev A - Manuel (Page 8)

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ROOFTOP INDUCER MOUNTING AND SCISSOR HINGE ASSEMBLY
Set the Inducer top motor side on top of the Inducer Base, aligning the hinges. Insert the two hinge pins with the heads on the outside portion
of the hinges, (See Diagram K).
Install hinges as follows: Inducer Top hinge: Insert 1/2” threaded stud through Inducer top, (2) washers, hinge (with stop on outside), spacer,
washer and 10-32 lock nut. Inducer Base hinge: Insert 1/2” threaded stud through Inducer Base, washer, hinge (with stop outside), spacer,
(2) washers and 10-32 lock nut, (See Diagram L). Use (2) provided 3/8” 8-32 self tapping screws to secure Inducer top to Inducer Base
through the two oval brackets on front of Inducer.
Insert Discharge Grilles inside Inducer Base on both sides with (3) 3/8” 8-32 self tapping screws provided. IMPORTANT: Grilles must be
installed on inside of Inducer Base, (See Diagram M).
MODEL RT750 / RT1500 - PSA-1 FAN PROVING SWITCH INSTALLATION
The RT750 and RT1500 models include the adjustable fan prov-
ing switch model PSA-1. Follow these general procedures for
pressure switch installation and adjustment. NOTE: If using the
DCOP1 control follow “Vent Pipe Sensing Sampling Tube & PSA-1
Fan Prover Location & Installation” section in DCOP1 manual.
1. Install Fan Proving Switch sampling tube in the vent con-
nector 2-3 pipe diameters after the elbow or "T" that turns
the vent from heater flue outlet from vertical to horizontal.
For multiple heater venting into a common manifold, install
after heater closest Rooftop Inducer. If the vent run is
completely vertical, install after draft hood or barometric
draft control. Installing the sampling tube nearer the Inducer
will make the adjustment easier because the pressure
sensed will be more negative and eliminate sensing pres-
sure near the switch’s bottom-end range, (See Diagram N)
2. Using a sharp drill bit to reduce burr, drill a 1/4" hole for
Fan Proving Switch sampling tube. Screw sampling tube
bracket to pipe with sampling hole centered, (See Diag. O).
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 O). With the
Rooftop Inducer on, a reading with a draft gauge can be
used to determine when interior of pipe has been penetrated.
4. IMPORTANT: Fan Proving Switch diaphragm must be mounted in a vertical position within six feet of the sensing location. Firmly
insert flexible tubing on sampling tube and Fan Proving Switch nipple 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 P).
DIAGRAM K DIAGRAM L DIAGRAM M
INSERT BOTH HINGE PINS. ASSEMBLE HINGES ON BOTH SIDES PER
DIAGRAM. NOTE: STOPS MUST FACE OUT. INSERT BOTH DISCHARGE GRILLES ON INSIDE OF
INDUCER BASE WITH (3) SELF TAPPING SCREWS.
STOP FACING OUT
1/2” THREADED
STUDS
INDUCER TOP
INDUCER BASE
FIGURE 8052070
TJERNLUND ROOFTOP
DRAFT INDUCER
(MUST BE MOUNTED
SIX FEET OF SENSING
VERTICALLY WITHIN
FAN PROVING SWITCH
LOCATION)
APPLIANCE
GAS APPLIANCE DRAFT
SAMPLE LOCATION
FLAME RETENTION
OIL BURNERS
OVER-FIRE DRAFT
DRAFT CONTROL
/ DRAFT HOOD
TJERNLUND ABD-SERIES
BALANCING BAFFLE
(IF BAFFLE IS INSTALLED
IT MUST BE POSITIONED
AFTER FAN PROVING SWITCH)
DIAGRAM N
DIAGRAM P
FAN PROVING SWITCH MUST
BE MOUNTED WITHIN SIX
FEET OF SAMPLING TUBE.
IMPORTANT:
SWITCH CAN BE ORIENTATED
IN A 360
O PLANE AS LONG AS
DIAPHRAGM IS IN A VERTICAL
ORIENTATION AND TUBING IS
NOT KINKED.
DIAGRAM O
1/4” STAINLESS STEEL
SAMPLING TUBE BEND MUST
FACE UPWARD
COMPRESSION FERRULE
COMPRESSION NUT
SAMPLING PORT CENTERED
OVER 1/4” HOLE