CleaverBrooks CB Ohio Special 100 HP, Operation, Service And Parts Manual, Page: 81 / 200

Chapter 5 — Starting and Operating Instructions
Part No. 750-184 5-9
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.
Close the manual by-pass valve after the temperature rise on the
fuel oil controller thermometer is noted. Be certain that hot oil is
moving through the controller. The orifice gate valve must also be
closed. If the 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 the point
approximately 30
°
F lower than the normal burning temperature. If
the system is equipped with a high oil temperature switch, it should
be set to open at 20 -30
°
F higher than normal burning temperature.
Note: The maximum oil temperature allowed in the system is
250°F.
Starting - When all the conditions covered above and in Sections A,
B, C and D are assured, the burner is ready for firing.
G. FIRING PREPARATIONS FOR GAS (SERIES 200-
400-700)
• Prior to initial starting, check the linkage attached to the gas
butterfly valve to assure that movement is free from binding.
• Verify the presence and availability of gas. On a new installation,
representatives of the gas utility should be present when gas first
flows 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 C, Chapter 5.
• Determine that sufficient pressure exists at the entrance to the
gas train by installing a test gauge downstream of the regulator.
• The gas pressure regulator must be adjusted to the proper
pressure level. Since the regulator is generally supplied by others,
adjustment should proceed according to instructions supplied by
its manufacturer.
It is necessary for the operator to know the burner requirements in
gas quantity and pressure. The information can generally be found
on the Dimension Diagram (DD) supplied by Cleaver-Brooks for the
specific installation. Should the information not be readily available,
consult the Cleaver-Brooks Service Department giving the boiler
serial number. Chapter 6 contains additional information along with
standard gas flow and pressure requirements.
• If the burner is a combination fuel model, set the gas/oil switch
to “gas.” Withdraw the oil burner gun and latch it in its rearward
position.
• On initial start-up, it is recommended that the main gas shutoff
cock remains closed until the programmer has cycled through
prepurge and pilot sequences. When the
fuel light on the control
panel comes on, observe the action of the motorized gas valve
stem to determine that it opens when energized. As soon as it is
confirmed, turn the burner switch “OFF” and let programmer
finish its cycle. Check that the gas valve has closed. Again, turn