IBC VX Series Installation & Operating Manual page 79

Boiler
Component
Check the water pressure. Pressure should be stable
when the boiler is firing and the water temperature is
rising.
If pressure rises sharply, consider replacement of
expansion tank.
Check also for noise at high fire, which may signal water
quality problems.
Water chemistry shall be of a quality generally accepted
as suitable for hydronic applications.
Ensure any direct "city fill" water connections are left in
the closed position to minimize exposure to leaks and
flooding.
Relief valve -
The relief valve manufacturer requires that under normal
maintenance
operating conditions a "try lever test" must be performed
and testing
every two months.
Under severe service conditions, or if corrosion and/or
deposits are noticed within the valve body, testing must
be performed more often. A "try lever test" must also be
performed at the end of any non-service period.
Test at or near the maximum operating pressure by
holding the test lever fully open for at least 5 seconds to
flush the valve seat free of sediment and debris. Then
release the lever and allow the valve to snap shut.
If the lever does not activate, or if there is no sign of
discharge, discontinue use of equipment immediately and
contact a licensed contractor or qualified service
personnel.
If the relief valve does not completely seal, and fluid
continues to leak from the discharge pipe - perform the
test again to try and flush any debris that may be lodged in
the valve. If repeated tries fail to stop the leakage, contact
a licensed contractor or qualified service personnel to
replace the valve.
While performing a "try lever test", a quantity of heat
transfer fluid will be discharged from the piping system
and the system pressure will drop. This fluid must be
Maintenance Required
75
7.2.2 General boiler maintenance
Frequency Check
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Annually
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Annually
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Annually
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Annually
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Annually