Reznor B Option - Power Venter Installation - Manual (Page 5)

Form I-F/B-PV, P/N 97967R2, Page 5
(See FIGURE 4A, page 3). Mark the three new screw holes on the top
of the heater.
2) Remove the adapter assembly and drill the holes with a 1/8" bit.
3) Attach the flue adapter assembly with five sheetmetal screws.
3. Check the Airflow
Switch
Prior to installing the venter sub-assembly, check the airflow switch for proper
operation.
4. Install Venter
Sub-assembly
The venter sub-assembly is assembled and wired at the factory. It includes the
venter wheel and housing, the motor, a junction box, an airflow switch, a time
delay relay, and a capacitor (Sizes 300 and 400 only). Position the venter sub-
assembly on the flue adapter assembly. (See FIGURE 6.) Rotate the venter to
a position that best suits your vent pipe direction. To ensure continued proper
operation of the sail switch, DO NOT position the venter with the vent opening
in a direction below horizontal.
FIGURE 5 - Airflow (Sail) Switch The airflow switch (A) is a small spring loaded switch
normally in an off position until the actuating button
under the hinge (B) is depressed to close the circuit. It
returns to the off position when the button is released.
A flat blade (C) -- hinged (B) at the back of the button
-- crosses the button and is extended into the airstream
of the venter. The venter motor is energized through
the thermostat, and when the fan air reaches velocity, it
pushes the airflow switch blade against the button clos-
ing the circuit to the electric gas valve.
The airflow switch blade that extends through an open-
ing (D) in the connection box (where it is located), is
bent to a 90° angle (E) and extends into the fan housing
through a 1/4" hole. The angle of the 90° bend must be adjusted by bending backward or forward so that
the switch can fully open or close.
A definite "click" is heard both when the switch opens and closes. In the open position (when the switch
button is depressed), a full 1/32" clearance should be provided after the "click" is heard. If that is not the
case, bend the blade back at the angle until proper clearance is provided.
When the blade is released, the off "click" must occur before the blade is fully returned to rest position
against the side of the hole in the fan housing.
This check should be done
prior to installing the venter to verify proper operation of the switch. After
installing the heater, the operation of the switch must be re-checked to be sure that clearances have not
been affected.
Drill hole. Insert screw.
Drill two more "evenly
spaced" holes and fasten.
Venter
Junction
Box
Venter Motor
FIGURE 6 - Attaching the Venter Sub-Assembly
Installed Flue
Adapter Assy
Instructions:
1) Holding the venter sub-assembly
in position with the desired vent
direction (never below horizontal),
drill a hole through the connect-
ing overlap in the top portion of
the venter sub-assembly and the
adapter assembly.
2) Insert a sheetmetal screw.
3) Drill two more holes approxi-
mately 120° apart and insert
sheetmetal screws.