GF-135
Esteem 399 Low NOx Boiler
Chapter 17
OMM-0089_0A
Installation, Operation & Maintenance Manual Maint. Procedures
Page
111
of
188
AERCO International, Inc.
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100 Oritani Dr.
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Blauvelt, NY 10913
OMM-0089_0A
MC1 06/19/14
Ph.: 800-526-0288
17.8 BOILER SYSTEM INSPECTION
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Verify all system components are correctly installed and operating properly.
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Check the cold fill pressure for the system, typical cold water fill pressure is 12 psig.
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Verify the system pressure, as the unit operates at high temperature, to ensure the
pressure does not exceed 25 psig. Excessive pressure reading indicates expansion tank
sizing is incorrect or system performance problems.
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Inspect air vent and air separators in the sys-tem. Remove the caps on automatic air
vents and briefly depress the valve stem to flush vent. Replace the cap when completed.
Ensure vents do not leak, replace any leaking vents.
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Verify boiler water pH level is between 6.0 and 8.0.
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Check and verify inhibitor /antifreeze concentration within the boiler water meets
inhibitor/antifreeze manufacturer’s specifications.
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If necessary contact a boiler water treatment company for a chemical analysis.
17.9 EXPANSION TANK INSPECTION
Refer to Chapter 5: Boiler Piping for recommended location of the expansion tank and air
eliminators.
Closed -Type Tank:
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Ensure tank is partially filled with water leaving an air gap as a cushion. Refer to the
manufacturer’s instruction for proper fill level.
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Ensure the tank is fitted with a device that reduces gravity circulation of air-saturated tank
water back into the system. This device prevents air from bubbling up through the water
as it returns from the system.
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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:
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Ensure the system contains a minimum of one automatic air vent. Recommended
location of the air vent should be atop an air eliminator.
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Remove the tank from the system and check the charge pressure. For residential
applications the charge pressure is typically 12 psig. If tank does not hold a charge
pressure, then the membrane is damaged and the tank should be replaced.
17.10 BOILER RELIEF VALVE INSPECTION
Inspect the relief valve and lift the lever to verify flow at least annually or as recommended on the
warning tag of the valve.
WARNING!
Before manually operating the pressure relief valve, ensure the
discharge piping is directed to a suitable place of disposal to avoid
a potential scald hazard. The discharge piping must be full size
without restriction and installed to permit complete drainage of both
the valve and line.
