General Description
1-18
750-96 (revised 2010)
Model CB Packaged Boiler Manual
The programming relay energizes or de-energizes the solenoid oil valves to permit or cut off oil flow to the burner.
Two valves, operating simultaneously, are used. These valves are closed when de-energized. They cannot be
opened (energized) unless the combustion air proving switch and the atomizing air proving switch are closed.
These are satisfied, respectively, by sufficient combustion air pressure from the forced draft fan and pressurized
air from the air pump.
The oil flow to the burner is controlled by the movement of the metering stem in the oil metering valve which var-
ies the flow to meet load demands. The metering valve and the air damper are controlled simultaneously at all
times by the modulating motor to proportion combustion air and fuel for changes in load demand.
1.16 — Oil Fuel Flow: Heavy Oil
Fuel oil is delivered into the system by the fuel oil supply pump which delivers part of its discharge to the oil
heater. The remainder of the fuel oil returns to the oil storage tank through a fuel oil relief valve and oil return
line.
The combination electric and steam oil preheater is controlled by thermostats. The electric oil heater thermostat
energizes the electric heater which is provided to supply heated oil on cold starts. The steam heater thermostat
controls the operation of the steam solenoid valve to permit a flow of steam to the heater when steam is avail-
able.
A hot water boiler is equipped to heat the oil with hot water from the boiler unless other preheating equipment is
used. The electric heater, which is housed separately, is sized to provide heated oil on a cold start. The hot water
thermostat controls the operation of a pump that supplies hot water to the oil heater when hot water is available.
The heated oil flows through a fuel oil strainer to prevent any foreign matter from entering the control valves and
nozzle.
The fuel oil controller contains in a single unit the necessary valves, regulators, and gauges to regulate the pres-
sure and flow of oil to the burner.
The program relay energizes or de-energizes the solenoid oil valve to permit or cut off oil flow to the burner. The
oil solenoid is closed when de-energized. It cannot be opened (energized) unless the combustion air proving
switch, the atomizing air proving switch, and the low oil temperature and any pressure switches are closed.
These are satisfied respectively, by sufficient combustion air pressure from the forced draft fan, pressurized air
from the air pump, and sufficient oil temperature.
The oil flow to the burner is controlled by the movement of the metering stem of the oil metering valve which var-
ies the flow to meet load demands. The metering valve and the air damper are controlled simultaneously at all
times by the modulating motor to proportion combustion air and fuel for changes in load demand.
Oil is purged from the burner gun upon each burner shutdown. The air purge solenoid valve opens as the fuel
valve closes and diverts atomizing air through the oil line. This assures a clean nozzle and line for the subsequent
restart. (Purging is not provided on No. 4 oil.)
Courtesy of: C3 Surplus LLC
Surplus Industrial Superstore
305-428-2777
https://www.c3surplus.com
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