Weil-McLain GOLD CGt Manual page 43

GOLD CGt Gas-Fired Water Boiler — Boiler Manual
10b
Service and maintenance – annual start-up
Diaphragm- or bladder-type expansion tanks
.
These tanks are welded gas tight with a rubber
membrane to separate the tank pressurizing air and
the water. May be located at any point in the system,
but most often found near the boiler.
• Systems with this type of expansion tank require
automatic air vent
at least one
cated on top of an air eliminator, as shown in
examples in manual Section
3. If relief valve has tended to weep frequently, the
expansion tank may be damaged or undersized.
•
First, check tank size to be sure it is large
enough for the system.
• If size is too small, add additional tank(s) as
necessary to provide sufficient expansion.
• If tank size is large enough, remove tank from
system and check charge pressure (usually
1 psig for residential applications).
• If tank won't hold pressure, membrane has
been damaged. Replace tank.
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
further.
. 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.
Part Number 550-110-290/0107
Figure 32 —
, preferably lo-
Relief valve,
typical
4
.
4
before proceeding
Safety relief valves should be
LEAST ONCE EVERY THREE YEARS
licensed plumbing contractor or authorized in-
spection 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 inoperative. Such conditions are not de-
tectable unless the valve and its components are
physically removed and inspected. This inspection
must only be conducted by a plumbing contrac-
tor 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 substantial property damage.
Following installation, the
operated AT LEAST ONCE A YEAR
that waterways are clear. Certain naturally oc-
curring mineral deposits may adhere to the valve,
rendering it inoperative. When manually operat-
ing the lever, water will discharge 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.
valve is inoperative.
Shut down boiler until a
new relief valve has been installed.
(cont.)
reinspected AT
, by a
valve lever must be
to ensure
If no water flows,
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