Tjernlund PAI-3,4,5,6,7 Commercial Combustion Air In-Forcer 8504036 Rev A 05/01 - Manual (Page 8)

IN-FORCER MOUNTING
INSTALLER NOTE
1. For easier wiring and servicing maintain 18” clearance from the rear and control sides and 12” from the top of the IN-FORCER.
2. For easier electrical interlock plan for sufficient duct so that the IN-FORCER can be suspended adjacent to the heating equipment
that it serves.
INSTALLER CAUTION
1. Do not directly discharge onto water piping or objects that may be affected by temperature extremes.
2. In areas with low temperature extremes it is advisable to insulate ducts or use insulated duct.
3. Do not exceed equivalent duct lengths listed in IN-FORCER Selection Table on Page 3.
The IN-FORCER is designed to be hung from an overhead support. The discharge must remain horizontal.
MODELS PAI-3 & PAI-4 (DIAGRAM F)
Verify that overhead support has sufficient strength to hold weight of IN-FORCER. Bend mounting support flanges to the angle best
suited to the specific installation. Use perforated strap (installer supplied) and the provided 1/4”-20 x 3/4” hex head bolts and kep nuts
to secure strap to the holes in the mounting flanges, (See Diagram F).
MODELS PAI-5, PAI-6, PAI-7 (DIAGRAM G)
Verify that overhead support has sufficient strength to hold weight of IN-FORCER. Suspend from included eyebolts and chain. The
eyebolts may be secured to either the top or bottom of the IN-FORCER casing. Attaching the eyebolts to the bottom allows the
IN-FORCER inlet to be positioned to the opposite side, giving the option of a right hand or left-hand inlet pipe connection. Secure eye
bolt to IN-FORCER with nuts and washer as shown. On bottom of cabinet install 1/4”-20 x 3/4” hex head bolts, washers and nuts,
(See Diagram G).
2. Connect crimped end of intake duct to the IN-FORCER inlet collar with sheet
metal screws. Tape connection to inlet collar and all joints of intake duct to
prevent the entry of indoor air.
3. The discharge should terminate no closer than 3 feet from a barometric draft
control or intake grille of an appliance. If this is not possible terminate on sides
or opposite side of appliance intake. Never terminate within 3 feet from the front
or intake side of appliance. Discharge duct should also terminate a minimum of
18 inches above floor or other obstructions if perpendicular to them, (See Diag. H).
These clearances are necessary to prevent pilot outages and ensure proper draft
control operation.
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DIAGRAM H
DIAGRAM F DIAGRAM G