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Part number 550-142-054/0411
71
GV90+ gas-fired water boiler — Boiler Manual
Annual start-up (continued)
Inspect boiler relief valve
1. Inspect the relief valve (Figure 80) and lift the lever to verify
flow as in the following warnings, excerpted from a relief valve
manufacturer’s warning label. Before operating any relief valve,
ensure that it is piped with its discharge in a safe area to avoid
severe scald potential. Read page 12 before proceeding further.
Safety relief valves should be reinspected AT LEAST
ONCE EVERY THREE YEARS, by a licensed plumb-
ing contractor or authorized inspection agency, to
ensure that the product has not been affected by cor-
rosive water conditions and to ensure that the valve
and discharge line have not been altered or tampered
with illegally. Certain naturally occurring conditions
may corrode the valve or its components over time,
rendering the valve inoperative. Such conditions are
not detectable unless the valve and its components
are physically removed and inspected. This inspec-
tion must only be conducted by a plumbing con-
tractor or authorized inspection agency — not by
the owner. Failure to reinspect the boiler relief valve
as directed could result in unsafe pressure buildup,
which can result in severe personal injury, death or
substantial property damage.
Following installation, the valve lever must be
operated AT LEAST ONCE A YEAR to ensure that
waterways are clear. Certain naturally occurring
mineral deposits may adhere to the valve, rendering
it inoperative. When manually operating the lever,
water will discharge and precautions must be taken
to avoid contact with hot water and to avoid water
damage. Before operating lever, check to see that a
discharge line is connected to this valve directing
the flow of hot water from the valve to a proper
place of disposal. Otherwise severe personal injury
may result. If no water flows, valve is inoperative.
Shut down boiler until a new relief valve has been
installed.
2. After following the above warning directions, if the relief
valve weeps or will not seat properly, replace the relief valve.
Ensure that the reason for relief valve weeping is the valve and
not over-pressurization of the system due to expansion tank
waterlogging or under-sizing.
To complete Annual Start-up,
perform startup and checks:
1. COMPLETE the annual start-up procedures
beginning on page 68.
2. Start boiler and perform checks and tests speci-
fied in this manual.
3. Verify cold fill pressure is correct and that operat-
ing pressure does not go too high.
4. Complete the check-out procedure on page 64.
Review with owner
1. Review the User’s Information Manual with the
owner.
2. Emphasize the need to perform the maintenance
schedule specified in the User’s Information
Manual (and in this manual as well).
3. Remind the owner of the need to call a licensed
contractor should the boiler or system exhibit
any unusual behavior.
4. Remind the owner to follow the proper shutdown
procedure and to schedule an annual startup at
the beginning of the next heating season.
Figure 80 Relief valve