CHAPTERS
The thermostat contacts close to energize the
booster water pump, which pumps water from
the boiler through the heater.
On cold starts, it
is
normal practice to manually close the valve
in
the
pump discharge line until the boiler water
temperature exceeds the temperature
of
the fuel
oil entering the beater.
The electric oil heater on a hot water boiler
burning No. 6 oil and equipped with a hot water
oil heater has a built-in adjustable thermostat.
The maximum temperature setting is stamped
on
its dial. The desired temperature can be obtained
by turning the adjusting screw. The thermostat
should be set at a temperature approximately 15
degrees lower than the hot water heater thermo-
stat. This prevents electric heater operation when
the water heater is functioning. The electric
heater
is
sized to provide sufficient heated oil for
low fire operation on cold starts before hot water
is
available.
750-150
ADJUSTMENT
PROCEDURES
DO.
STEAM
HEATER
PRESSURE
REGULATOR
(400
and
600
Series
-
Steam)
This regulator is provided on a boiler designed
to
operate at boiler pressures above 15 psi for the
purpose
of
reducing boiler steam pressure to the
level
necessary for proper operation
of
the steam
oil heater. This pressure should be reduced
to a
point that permits sufficient temperature
to heat
the oil while allowing as continuous a steam flow
as
possible. Pressure that is too high will result
in
frequent cycling
of
the steam solenoid valve.
It
is best to adjust the regulator under typical flow
conditions. To do this, it is suggested that the
globe valve
in
the steam supply line be closed so
that there
is
n~
pressure on the regulator. Tum
out the adjusting screw fully to relieve compres-
sion on the regulator spring, thus closing the
regulator. With steam at normal pressure, open
the globe valve and then set the secondary
pres~
sure
by
turning the adjusting screw or handle
until the downstream gauge shows the desired
pressure.
CHAPTER 5-25
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