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Part Number 550-142-300/0520
46
CGa Series 3 Gas-Fired Water Boiler — Boiler Manual
2. After following the above warning directions, if the relief valve
weeps or will not seat properly, replace the relief valve. Ensure
that the reason for relief valve weeping is the valve and not over-
pressurization of the system due to expansion tank waterlogging
or undersizing.
Figure 27 Relief valve, typical
❏ Review with owner
1. Review the User’s Information Manual with the owner.
2. Emphasize the need to perform the maintenance schedule speci-
fied in the User’s Information Manual (and in this manual as
well).
3. Remind the owner of the need to call in a licensed contractor
should the boiler or system exhibit any unusual behavior.
4. Remind the owner to follow the proper shutdown procedure
and to schedule an annual start-up at the beginning of the next
heating season.
❏ Cleaning boiler heating
surfaces
The boiler contains ceramic fiber and fiberglass
materials. Use care when handling these materials
per instructions on page 66 of this manual. Failure
to comply could result in severe personal injury.
1. Shut down boiler:
• Follow “To Turn Off Gas to Appliance” instructions on boiler
and Operating instructions.
• Do not drain boiler unless it will be exposed to freezing tem-
peratures. If using antifreeze in system, do not drain.
2. Follow shutdown procedure.
3. Remove venting system connection to boiler.
4. Remove top jacket panel. Turn back insulation.
5. Remove flue collector. Clean sealant from assembly and sections.
Safety relief valves should be rein-
spected AT LEAST ONCE EVERY
THREE YEARS
, by a licensed plumb-
ing contractor or authorized inspection
agency, to ensure that the product has
not been affected by corrosive water
conditions and to ensure that the valve
and discharge line have not been altered
or tampered with illegally. Certain
naturally occurring conditions may
corrode the valve or its components
over time, rendering the valve inopera-
tive. Such conditions are not detectable
unless the valve and its components are
physically removed and inspected. This
inspection must only be conducted by
a plumbing contractor or authorized
inspection agency — not by the owner.
Failure to reinspect the boiler relief
valve as directed could result in unsafe
pressure buildup, which can result in
severe personal injury, death or sub-
stantial property damage.
Following installation, the valve lever
must be operated AT LEAST ONCE
A YEAR
to ensure that waterways are
clear. Certain naturally occurring min-
eral deposits may adhere to the valve,
rendering it inoperative. When manu-
ally operating the lever, water will dis-
charge and precautions must be taken
to avoid contact with hot water and to
avoid water damage. Before operating
lever, check to see that a discharge line
is connected to this valve directing the
flow of hot water from the valve to
a proper place of disposal otherwise
severe personal injury may result. If
no water flows, valve is inoperative.
Shut down boiler until a new relief
valve has been installed.
Service & maintenance – annual start-up (cont.)10b
❏ Check/test (continued)
Boiler relief valve
1. Inspect the relief valve and lift the lever to verify flow as
in the following warnings, excerpted from a relief valve
manufacturer’s warning label. Before operating any
relief valve, ensure that it is piped with its discharge in
a safe area to avoid severe scald potential. Read manual
Section 3 before proceeding further.
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