Start Up And Adjustments - Empire Comfort Systems BF28BMN-4 Installation Instructions Manual

A. Turn on the main electrical power to the heater and turn
the main burner switch to the ON position. See Figure 54.
Verify power is on by checking if there is power to the cir-
cuit board. If the unit has power, the power light will be
illuminated.
Figure 54
B. Turn on the main gas supply.
C. Turn both burner switches on to ignite both the front and
rear burners.
D. The Display Panel board should be energized, and the
power light will be illuminated.
Sequence of Operations – Front and Back Burners
1. The Display Panel will be energized, and the lights for the
front burner and back burner will flash.
2. The inducer will activate immediately and will prove the
pressure switch within 16 seconds. This will initiate the
ignition sequence.
3. The rear igniter (HSI) will energize and start to glow red.
4. Within 3 to 5 seconds, the gas valve will open and ignite
the rear burner. The flame sensor will verify the flame is
present within 2 to 5 seconds.
5. The igniter for the front burner will energize 5 to 7 seconds
after the flame is established on the rear burner.
6. The gas valve will open to ignite the front burner within 3 to
5 seconds. The flame sensor will verify the flame is pres-
ent within 2 to 5 seconds.
7. As the Mantis warms up, the circulating blower will acti-
vate, starting on Low speed. The Low Blower L.E.D. will
light when the blower turns on.
8. As the Mantis continues to operate, the speed of the
circulating blower will increase, and the L.E.D. for Medium
and High will appear.
FRONT
BURNER
SWITCH
REAR
BURNER
SWITCH
Figure 55
Page 30

START UP AND ADJUSTMENTS

ECONOMY
DISPLAY
BUTTON
= OFF
= ON
CAUTION
When switching from one burner to the other burner,
be sure to first turn "ON" the desired burner before
turning "OFF" the burner that is operating. Failure to
follow this sequence may result in the heater needing
to be reset. See page 33 - Resetting the Heater.
Sequence of Operations – One Burner Only
1. The Display Panel will be energized, and the light for either
the front burner or back burner will flash, corresponding to
which burner switch is activated.
2. The inducer will activate immediately and will prove the
pressure switch within 16 seconds. This will initiate the
ignition sequence.
3. The igniter (HSI) will energize and start to glow red.
4. Within 3 to 5 seconds, the gas valve will open and ignite
the burner. The flame sensor will verify the flame is present
within 2 to 5 seconds.
5. The igniter for the front burner will energize 5 to 7 seconds
after the flame is established on the burner.
6. As the Mantis warms up, the circulating blower will acti-
vate, starting on Low speed. The Low Blower L.E.D. will
light when the blower turns on.
7. As the Mantis continues to operate, the speed of the
circulating blower may increase.
Figure 56
Checking Manifold Pressure
Both Propane and Natural gas valves have a built-in pressure
regulator in the gas valve. Natural gas models will have a mani-
fold pressure of approximately 4.0 in. w.c. at the valve outlet,
with the inlet pressure to the valve at 5.0 in. w.c. to 10.5 in. w.c.
Propane gas models will have a manifold pressure approxi-
mately 7.0 in. w.c. at the valve outlet, with the inlet pressure to
the valve from 11.0 in. w.c. to 13.0 in. w.c.
A 1/8 inch N.P.T. plugged tapping, accessible for test gauge
connection, is located on the outlet side of the gas control.
Blower Operation
The circulating air blower will automatically engage and in-
crease in speed depending on the operation of the burners.
See Figure 56. In most circumstances, the circulating blower
will start 3 to 5 minutes after ignition of the burners.
Once the heater is turned off or the call for heat has been satis-
fied, the circulating blower will continue to run. The blower will
automatically turn off once the heater has cooled down.
27297-5-0511