Manual

44
Maintenance Procedures
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Any problems reported by the owner should be checked,
verified and corrected before proceeding with any main-
tenance procedures.
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Verify that the area surrounding the Cascade is free of
combustible / flammable materials or flammable vapors
or liquids. Remove immediately if found.
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Inspect water piping on the Cascade system for leaks
and verify that the piping is leak free and properly sup-
ported.
Inspect the fittings and components on the unit and ver-
ify they are leak free.
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WARNING
WARNING
NOTICE
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Verify all system components are correctly installed and
operating properly.
Check the cold fill pressure for the system, typical cold
water fill pressure is 12 psig.
Verify the system pressure, as the unit operates at high
temperature, to ensure the pressure does not exceed 25
psig (Standard Cascade) or 75 psig (High Pressure (HP)
Cascade). Excessive pressure reading indicates expan-
sion tank sizing is incorrect or system performance prob-
lems.
Inspect air vent and air separators in the system. Remove
the caps on automatic air vents and briefly depress the
valve stem to flush vent. Replace the cap when complet-
ed. Ensure vents do not leak, replace any leaking vents.
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Refer to Section VI - System Piping for recommended
location of the expansion tank and air elimination
devices.
Closed -Type Tank:
- Ensure tank is partially filled with water leaving
an air gap as a cushion. Refer to the manufac-
turer’s instruction for proper fill level.
- Ensure the tank is fitted with a device that
reduces gravity circulation of air-saturated tank
water back into the system. This device pre-
vents air from bubbling up through the water as
it returns from the system.
- Ensure no automatic air vents are used in the
system. This will allow air to escape from the
system instead of returning to the tank.
Diaphragm Tank:
- Ensure the system contains a minimum of one
automatic air vent. Recommended location of the
air vent should be atop an air elimination devices.
- Remove the tank from the system and check the
charge pressure. The charge pressure is typical-
ly 12 psig. If tank does not hold a charge pres-
sure, then the membrane is damaged and the
tank should be replaced.