Burnham HF SERIES - Manual (Page 22)

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• Push red reset button to reset safety switch.
b. Simulate ignition failure:
• Follow the starting procedure to turn on the
burner, but do not open the oil supply hand
valve.
• Safety switch should lock out in approxi-
mately 15 seconds. Ignition and motor
should stop and oil valve should close.
• Push red reset button to reset safety switch.
c. Simulate power failure:
• Follow the starting procedure to turn on the
burner.
• With the burner running, turn off the power
to the system by tripping the circuit breaker
or removing the fuse.
• Burner should stop.
• Restore power. Burner should start.
3. VERIFY HIGH LIMIT OPERATION.
a. Adjust thermostat to highest setting.
b. Observe temperature gauge. When temperature
is indicated, adjust limit to setting below ob-
served temperature. Burner should stop.
c. Adjust limit to setting above observed tempera-
ture. Burner should start.
d. Adjust thermostat to lowest setting. Adjust limit
to desired setting.
4. CHECK LOW WATER CUTOFF (if so equipped).
a. Adjust thermostat to highest setting.
b. With boiler operating, open drain valve and
slowly drain boiler.
c. Burner should stop when water level drops below
low water cutoff probe. Verify limit, thermostat or
other controls have not shut off boiler.
d. Adjust thermostat to lowest setting. Refill boiler.
Q. FREQUENT WATER ADDITION
A leaky system will increase the volume of make-up
water supplied to the boiler which can significantly
shorten the life of the boiler. Entrained in make-up water
are dissolved minerals and oxygen. When the fresh,
cool make-up water is heated in the boiler the minerals
fall out as sediment and the oxygen escapes as a gas.
Both can result in reduced boiler life. The accumulation
of sediment can eventually isolate the water from
contacting the steel. When this happens the steel in
that area gets extremely hot and eventually cracks. The
presence of free oxygen in the boiler creates a corrosive
atmosphere which, if the concentration becomes high
enough, can corrode the steel through from the inside.
Since neither of these failure types are the result of a
manufacturing defect the warranty does not apply.
Clearly it is in everyone’s best interest to prevent this
type of failure. The maintenance of system integrity is
the best method to achieve this.