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Vapor Power International LLC
551 S. County Line Road, Franklin Park, Il 60131
Phone: 630-694-5500 Fax: 630-694-2230
required operating temperature but shall not exceed 250°F. Proper system
operation can be checked via either the temperature gauge mounted on
the boiler’s supply piping or via the digital indication on the temperature
control..
B.
Response/Range Adjustment - For boilers supplied with solid state step
controls. A “span” adjustment on the temperature control adjusts the
response/ differential of the control.
C.
Interstage Time Delay – Most solid state step controls now include
adjustable interstage time delays. Some even include different delays for
steps-on and steps-off which can be adjusted to minimize contactor cycles
while still maintaining the required responsiveness of the control. Check
the vendor-supplied literature provided at the rear of this manual.
4.2.3 TEMPERATURE CONTROL
(Boilers supplied with one or more control thermostats)
Smaller HWR boilers are provided with one or more independent control
thermostats, which switch on or off heating elements in accordance with
their temperature setting. The differential between the thermostats should
be set in accordance with system requirements.
4.2.3
TEMPERATURE LIMIT THERMOSTATS
Check that that the auto and manual reset limits are set approximately 10%
and 15%, respectively, greater than the temperature control but not to
exceed 250°F.
4.2.4
Auxiliary Controls
Other controls supplied with the boiler (eg, KW limit controls, cycle or
delay timers, etc) should be set per the Engineer’s specifications.
NOTE: REFER TO DESCRIPTIVE LITERATURE IN THE REAR OF THIS
MANUAL ON THE RESPECTIVE AUXILIARY CONTROLS.
