Page 6 Oil-Fired BCS
FRESH AIR INTAKE VENT
Proper sealing of the fresh air intake vent material is important, but temperature is not an
issue. Failure to properly seal the inlet venting subjects the burner to possible reverse drafts
after burner shutdown—a hazardous condition with the possibility of creating a fire.
Use only solid or flexible metal duct, rigid plastic, or similar material of 4" diameter. Note: Do
not use flexible plastic dryer vent hose. Avoid tight turns with flexible ducting and limit
length. If using solid ducting, use a maximum of two elbows and 15' horizontal length. One
additional elbow may be used if horizontal distance from the BCS outlet to the heater is re-
duced three feet.
BURNER
The BCS burner is a custom burner equipped with an outside fresh air receiver, nozzle pre-
heater, fuel oil solenoid valve and a custom electronic primary control having a 15-minute
post-purge timer. Do not use burner controls with shorter post-purge times as burner damage
may result.
MOUNT THE OIL BURNER
An aquastat with immersion well is packed with the burner. The thermostat is factory set at
120°F for residential use. The maximum setting for 20, 32, 40, and 51E-BCS models is 160°F; for
120 and 190E-BCS models the maximum setting is 180°F. (See the caution on page 1 regarding
temperature variations.) Install the immersion well with the aquastat and verify that the sens-
ing bulb may be fully inserted into the well. (Refer to “Controls” section on page 10.)
Remove the cardboard core from the burner opening in the water heater. Mount the burner on
stud bolts, making sure to place the supplied gasket between the burner flange and heater.
Secure the burner to the heater with the
1
⁄4-20 nuts or
3
⁄8" 16 cap screws supplied.
CONNECT THE ELECTRICITY
REFER TO BURNER WIRE DIAGRAM (page 14). All wiring must comply with applicable codes
and ordinances. The primary relay and aquastat are wired to the burner at the factory. Install
the aquastat well in the
3
⁄4" tapping at the front of the heater. Be sure the sensing bulb is all
the way in. Tighten the aquastat retaining screws to secure the control to the well. Connect
the power supply to the aquastat, being sure to run through a fused disconnect switch (to be
attached to heater in the field).
