USER’S INFORMATION MANUAL
14
COMBI BOILERS 99
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125
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160
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199
Relief Valve - Maintenance and Testing
The relief valve manufacturer requires that under normal operating conditions a
“try lever test” must be performed quarterly. Under severe service conditions, or
if corrosion and/or deposits are noticed within the valve body, you must test more
often. Also perform a “try lever test” at the end of any non-service period.
Test at or near 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 attempts 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. We highly recommend using a system pressurization unit
such as an Axiom Industries model MF200 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, turn
on the unit’s auto ll valve to recharge the lost uid.
Domestic Hot Water System
Quality of the domestic cold water is very important to the longevity of the unit.
The recommended pH of the domestic water is between 6.5 and 8.5. The internal
domestic water heat exchanger tubing and the ow sensor is subject to fouling if
exposed to hard water (over 11.68 grains of hardness) or has a TDS of 500mg/L
or higher. See Table 3.
DESCRIPTION MAX MIN
Water Pressure 150 PSI 40 PSI
Programmable water temperature 149°F (65°C) 105°F (40°C)
Minimum Flow Rate to Activate DHW Sensor N/A 0.5 GPM
Acceptable pH range 8.5 6.5
Total Dissolved Solids 500 mg/l
Total Hardness 200 mg/l 11.68gr/gal
Aluminum 0.2 mg/L 0.05 mg/L
Chlorides 250 mg/lL
Copper 1 mg/lL
Iron 0.3 mg/lL
Manganese 0.05 mg/lL
Zinc 5 mg/lL
Table 3: Domestic Water Quality Guidelines
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 safely dispose
of water to an open drain.of water to an open drain.
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