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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.
14
COMBI BOILERS 99 - 125 - 160 - 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 flush 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 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 attempts 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 replaced . We highly recommend using a system pressurization unit
such as an Axiom Industries model MF200 to refill and pressurize your system.
Capture the discharged fluid 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 fill valve to recharge the lost fluid.
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 flow sensor is subject to fouling if
exposed to hard water (over
or higher . See Table 3.
DESCRIPTION
Water Pressure
Programmable water temperature
Minimum Flow Rate to Activate DHW Sensor
Acceptable pH range
Total Dissolved Solids
Total Hardness
Aluminum
Chlorides
Copper
Iron
Manganese
Zinc
Table 3: Domestic Water Quality Guidelines
of hardness) or has a TDS of 500mg/L
11 .68 grains
MAX
150 PSI
149°F (65°C)
N/A
8 .5
500 mg/l
200 mg/l 11 .68gr/gal
0 .2 mg/L
250 mg/lL
1 mg/lL
0 .3 mg/lL
0 .05 mg/lL
5 mg/lL
USER'S INFORMATION MANUAL
MIN
40 PSI
105°F (40°C)
0 .5 GPM
6 .5
0 .05 mg/L
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