Starting and Operating Instructions
4-10
750-96 (revised 2010)
Model CB Packaged Boiler Manual
The electric heater on burners equipped for No. 6 fuel oil is sized so that it is capable of supplying heated oil at a
rate no greater than that required for low fire operation and is primarily supplied for convenience on cold starts.
Heating coils utilizing either steam or hot water are supplied to provide sufficient quantities of oil so that higher
rates of firing can be accomplished once steam pressure or hot water is available. In normal operation, the ther-
mostat governing the electric heating element is kept at a lower setting than the thermostat governing admission
of steam to the heater, or of hot water circulation, so that heating is not performed electrically except when steam
or hot water is not available.
Set the steam thermostat or the hot water thermostat to maintain an oil temperature of 220º-230º F. The electric
heater will be turned off automatically as soon as steam or hot water provides heat.
Close the manual bypass valve after temperature rise on the fuel oil controller thermometer is noted. Make certain
that hot oil is moving through the controller. The orifice gate valve must also be closed. If temperature drops, open
the orifice gate valve until a rise is noted, then close it.
Once the correct setting of the heater thermostats has been established, set the low oil temperature switch at a
point approximately 30º lower than the normal burning temperature. If the system is equipped with a high oil tem-
perature switch, this should be set to open at 20º-30º higher than normal burning temperature.
4.8.4 — Starting
When all the conditions covered above and in Section 4.1, 4.2, 4.3, and 4.4 are assured, the burner is ready for
firing. Refer to Section 4.10 of this chapter for further starting and operating information.
4.9 — Firing Preparations for Gas: Series 200-300-400-700-900
Prior to initial starting, check the linkage attached to the gas butterfly valve to see that movement is free from
binding.
Verify the presence and availability of gas. On a new installation, representatives of the gas utility should be pres-
ent when gas is first turned into the system to supervise purging of the new gas line unless they have already done
so.
Determine that the pilot is operating properly as outlined in Section 4.3
Before turning on the electric oil heater switch, make certain that the heater shell is filled with fuel oil as indicated by a
pressure reading on the fuel oil pressure gauge.
NOTE: The temperatures listed are tentative. The composition of the fuel oil in a given grade can vary, necessitating a
higher or lower preheating temperature. The viscosity of the oil at the nozzle should be less than 300 SSU and prefer-
ably less than 150 SSU. The actual temperature of the oil at the burner should be determined by flame appearance
and good combustion based on a stack analysis. See Chapter 5 for additional information.
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