Benjamin Heating products WK400, Owner'S Manual

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-5-
BLOWER MOTOR
The variable speed pulley must be set to give, not greater than, 85 degree F. temperature rise with a plus
.20" W.C. static pressure. Setting is necessary due to the varying resistance found in duct systems.
BLOWER COMPARTMENT ASSEMBLY
1. Screw the blower frame on the chosen side panel 1" from bottom of the furnace base and in the center
of the side panel.
2. Scribe a line around inside of the blower frame, remove the blower frame and cut out the blower
opening in the side panel.
3. Cut and fit the foil faced insulation inside blower
frame (see section A-A). Install the frame on the
side panel.
4. Remove the blower and filter from the
compartment. Install 2 - 3/16" stove bolts
through the bases. Install 8 sheet metal screws as
shown. Ensure the blower casing is square so the
door fits properly.
5. Ensure the furnace and blower are well supported
on a noncombustible floor.
6. Reinstall the blower and filter. Blower mouth
should extend 1/2" inside the furnace side panel.
7. Check the blower pulleys for alignment and
8. Install electrical components as shown and wire
as per diagram.
9. Mount the fan limit as shown, using the bracket
provided.
10. If properly mounted, the blower will make
contact with foil faced insulation 1/8" all around.
11. Use insulation obtained from cutout for blower
gasket.
Do NOT use a manual smoke damper with this unit.
This furnace must be installed by a qualified
installer.
Use only metal ducts for this furnace.
Do NOT allow inexperienced persons to service fire.
INSTRUCTIONS FOR OUT OF CONTROL FIRE
(Caused by excessive fueling and/or soot or creosote build up or too much draft)
1. Close the supply of combustion air by lowering the thermostat to a minimum setting and unhook the
damper motor chain.
2. Block the over-fire draft slot in the door.
3. Reduce the draft by fully opening the barometric damper.
4. As excess heat may damage safety controls, they should be carefully checked before restarting the
furnace.
CAUTION: Too much air can cause the fire to burn out of control. Adjust screw or chain to maintain
small fire. A damper motor will safely control larger fires. Keep the fire door closed as much as possible.
The door gaskets and clean out cover seals must be maintained in good condition to maintain safe
operation.
A
A
BLOWER FRAME
BLOWER OPENING
CUT OUT
SMOKE
PIPE
SIDE PANEL
LEFT SIDE SHOWN
RIGHT SIDE OPPOSITE
BLOWER COMPARTMENT
D
A
M
P
E
R
M
O
T
O
R
C
WK400
BLOWER FRAME
FOIL FACED INSULATION
3/8"
MIN.
SECTION A - A
-"18 SHEET"
METAL SCREWS