Chapter 2 — Burner Operation and Control
2-12 Part No. 750-184
G. Lube Oil Cooling Coil: Cools the lubricating oil before it enters the
air pump. A fan driven by the air pump motor circulates cooling
air over the coil.
H. Lube Oil Fill Pipe and Strainer: Used when adding oil to the air-oil
receiver tank.
13.Low Oil Pressure Switch (Optional): Switch contacts open when
the fuel oil pressure drops below selected pressure. Switch will
interrupt the limit circuit upon loss of sufficient fuel oil pressure
for correct combustion.
14.Fuel Oil Pump: Transfers fuel oil from the storage tank and
delivers it under pressure to the burner system.
F. ADDITIONAL CONTROLS FOR HEAVY OIL
An oil heater is provided to heat heavy oil to the point where it can
be effectively atomized and burned. Most heavy oil heaters utilize
an electric heater to reduce the viscosity of the heavy oil until the
point where either steam or hot water is available. Heavy oil heaters
operating with hot water will have additional controls not shown
here.
Heater Switch (Not Shown): Manually provides power to the oil
heater system.
1. Oil Heater (Electric): Used for heating sufficient fuel oil for low-
fire flow during cold starts before steam or hot water is available
for heating. The heater must be turned off during extended boiler
lay-up, or at any time the fuel oil transfer pump is stopped.
2. Electric Oil Heater Thermostat: Senses fuel oil temperature and
energizes or deenergizes the electric oil heater to maintain
required temperature of the fuel oil.
3. Steam Oil Heater Thermostat: Senses fuel oil temperature and
controls the opening and closing of the steam heater valve to
maintain the required temperature of the fuel oil.
4. Oil Heater Shell (Steam/Hot Water): Heats fuel oil through
medium of steam or hot water. Electric heater is housed in the
steam heater, but is housed separately on a hot water heater.
Steam oil heaters on 15 psi boilers operate at boiler pressure.
Steam oil heaters furnished on high pressure boilers are to be
operated at less than 15 psi. Operation is accomplished with a
steam pressure regulator valve.
5. Oil Return To Tank: Excess oil returned to the heavy oils supply
tank.
6. Oil Inlet From Supply Tank: Heavy oil inlet from the supply tank.
7. Steam Heater Check Valve: Prevents oil contamination of the
waterside of pressure vessel should any leakage occur in the oil
heater.
8. Steam Trap: Drains condensate and prevents loss of steam from
the steam oil heater. Condensate must be piped to a safe point
of discharge.
9. Check Valve (Steam Heater Discharge): Prevents air entry during
shutdown periods when cooling action may create vacuum
within steam heater.
10.Steam Heater Pressure Regulator: Adjust to provide reduced
(usually less than 15 psi) steam pressure to the heater to
To Next Page
Loading...