4-3
MAINTENANCE
SL 10-85 G3, SL 14-115 G3, SL 20-160 G3, SL 30-199 G3 MODULATING GAS BOILERS
4.1.13 Relief Valve - Maintenance and Testing
The relief valve manufacturer requires that under normal operating conditions a “try
lever test” must be performed 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 ush the valve seat free of sediment and debris. Then release the lever
and permit the valve to snap shut.
If the lever does not activate, or there is no evidence of discharge, discontinue use of
equipment immediately and contact a licensed contractor or qualied service personnel.
If the relief valve does not completely seal, and uid continues to leak from the discharge
pipe - perform the test again to try and ush any debris that may be lodged in the valve.
If repeated tries fail to stop the leakage, contact a licensed contractor or qualied service
personnel to replace the valve.
While performing a “try lever test”, a quantity of heat transfer uid will be discharged from
the piping system and the system pressure will drop. This uid must be replaced. It is
highly recommended that a system pressurization unit, such as an Axiom Industries model
MF200 be employed to rell and pressurize your system. Capture the discharged uid
in a container and recycle it by returning it to the system feeder unit. This is particularly
important when your system contains treatment chemicals or glycol solutions. If the
system employs plain water, the boiler auto ll valve must be turned on in order to
recharge the lost uid.
CAUTION
Before testing the relief valve,
make certain the discharge pipe
is properly connected to the
valve outlet and arranged to
contain and safely dispose of
equipment discharge.
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