Weil-McLain GOLD CGa Installation And Maintenance Manual page 48

GOLD
10b
Service & maint. —
❏
Check/test . . . . . . .
Diaphragm- or bladder-type
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.
2. If relief valve has tended to weep frequently, the
expansion tank may be waterlogged or undersized.
Closed-type tank
waterlogged. Install a tank fitting if not already
installed. Then check fill level per fitting
manufacturer's instructions. If fill level is correct,
check tank size against manufacturer's instructions.
Replace with a larger tank if necessary.
Diaphragm- or bladder-type
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 12 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
proceeding further.
EVERY THREE YEARS
contractor or authorized inspection agency, to ensure
48
CGa Gas-Fired Water Boiler
circulation of air-saturated tank water back to
the system and prevents the air from bubbling
up through the water as it returns from the
system.
•
Do not use automatic air vents in systems
with closed-type tanks.
from the system instead of returning to the tank.
Eventually, the tank will waterlog and no longer
control pressurization. The boiler relief valve
will weep frequently.
• Systems with this type of expansion tank
require at least one
automatic air vent
preferably located on top of an air eliminator,
as shown in examples in manual section
pages 16-25.
— tank is most likely
Safety relief valves should be
reinspected AT LEAST ONCE
, by a licensed plumbing
annual start-up
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 detectable unless
the valve and its components are physically removed
and inspected. This inspection must only be conducted
The air will escape
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 substantial property damage.
— welded gas tight
ONCE A YEAR
Certain naturally occurring mineral deposits may
adhere to the valve, rendering it inoperative. When
manually operating the lever, water will discharge and
,
precautions must be taken to avoid contact with hot
water and to avoid water damage. Before operating lever,
,
3
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.
Shut down boiler until a new relief valve has been
installed.
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
— first, check tank
undersizing.
Figure 27 Relief valve, typical
, page 16, before
3a
59343
continued
Following installation, the
lever must be operated AT LEAST
to ensure that waterways are clear.
If no water flows, valve is inoperative.
Part Number 550-110-593/1099
valve