Caution
Installers should inquire of local water purveyors as to the suitability of their supply for
use in hydronic heating systems.
If water quality is questionable, a local water treatment expert must be consulted for
testing, assessment and, if required, treatment.
Alternatively, water or hydronic fluid of known quality can be brought to the site.
7.1.11 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.
Maintenance for Relief valve
Frequency
Check
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 replaced. To refill and pressurize your system, we
recommend using a system pressurization appliance such as an Axiom
Industries model SF100 series. Capture the discharged fluid in a
container and recycle it by returning it to the system feeder appliance.
This is particularly important when your system contains treatment
chemicals or glycol solutions. If the system employs plain water, the
boiler auto fill valve must be turned on in order to recharge the lost fluid.
Annually
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Section: Service and maintenance
Summary of Contents for EX Series
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Page 121: ...Appendices Wiring diagrams Figure 73 Controller electrical diagram 119 Appendices...
Page 122: ...Figure 74 Internal wiring diagram EX 400 and EX 500 models 120 Section Appendices...
Page 123: ...Figure 75 Internal wiring diagram EX 700 and EX 850 models 121 Wiring diagrams...
Page 124: ...Figure 76 Sequence of Operation 122 Section Appendices...
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Page 128: ...126 Boiler parts diagram EX 400 and EX 500...
