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BRADFORD WHITE CORP.
8.3 Short Cycling — Boiler
Because the Brute Deluxe is a stage-fired boiler,
and its input will decrease when there is a reduction in
heating load, short cycling is greatly reduced. If the
heating load drops below the minimum input of the
boiler for an extended period, the boiler will have a
tendency to short cycle. This can be a symptom of
improper control strategy or setpoints, or a load
distribution problem. Contact your representative to
discuss possible remedies.
8.4 Short Cycling — Water Heater
Short cycling will generally occur only in
combination space heating and water heating
applications when the water heater is operating in the
space-heating mode. Because the Brute Deluxe is a
stage-fired water heater and its input will reduce when
there is a reduction in heating load, short cycling is
greatly reduced. If the heating load drops below the
minimum input of the water heater for an extended
period, the water heater will have a tendency to short
cycle. If short cycling is frequently experienced,
regardless of the control’s attempt to limit it, the heating
load should be redistributed to control it.
If short cycling occurs in a water heater application,
it is probably caused by undersized piping between the
water heater and the storage tank or by some other factor
that restricts proper water flow through the water heater.
The cause should be determined and corrected.
8.5 High Gas Consumption
Appliances operating with an improper air/fuel
ratio are very inefficient and consequently, have very
high gas consumption. Because efficiency is high when
the CO
2
is high (or O
2
is low), appliances operating with
low CO
2
or high O
2
(especially LP appliances) consume
more gas. Adjust the CO
2
or O
2
for optimum efficiency.
If no combustion analyzing equipment (CO
2
or O
2
) is
available then a proper adjustment of the air/fuel ratio
(CO
2
or O
2
) cannot be accomplished. However, by
briefly sniffing the flue gases it is possible to determine
if the CO
2
or O
2
is within the proper range. No
significant flue gas odor should be detected when
combustion is proper. A strong piercing smell indicates
poor combustion and generally a lean mixture - low CO
2
or high O
2
. The CO
2
should be 8% at high fire. To check
the CO
2
, first verify that the supply gas pressure is
within 5" to 13" w.c. (1.2 to 3.2 kPa) With the Brute
Deluxe running with all stages firing, set the air box
pressure to 1.5" w.c. (0.37 kPa) (as a starting point), by
adjusting the air shutter(s) at the bottom of the fan(s).
Check the CO
2
, and adjust the air shutters if further
adjustment to the CO
2
is needed. Sizes 1250 to 2000
have two blowers and two air chambers (boxes). The
pressure of each air box must be equal when the final
adjustment is made.
SECTION 9.
Replacement Parts
Only genuine replacement parts should be used.
9.1 General Information
To order or purchase parts for the Brute Deluxe,
contact your nearest dealer or distributor. If they cannot
supply you with what you need, contact Customer
Service (see back cover for information).
9.2 Parts List - see next page.