Weil-McLain Gold CGi Series 2 User Manual page 44

GOLD
10b
Service and maintenance —
❏
Gas piping
1. Sniff near floor and around boiler area for any indication
of a
2.
Test gas piping using bubble test
manual, if there is any indication of a leak.
Cold fill and operating pressures
1. While the system is cold, note the
the boiler pressure/temperature gauge. Verify that cold
fill pressure is correct.
2.
Watch the pressure
ensure pressure rise is normal. Too high a rise would
indicate a waterlogged or undersized expansion tank.
Air vents and air elimination
1. Inspect automatic air vents (if used).
Also inspect air separators to ensure
they are operational.
2. The cap must be unscrewed one
turn to allow air to escape.
3. See
leaking, remove cap
push valve
clean the valve seat.
4. Replace cap
onto valve
one turn.
Limit controls and cutoffs
1. Inspect and test the boiler limit control. Verify operation
by turning control set point below boiler temperature.
Boiler should cycle off. Return dial to original setting.
2. Inspect and test additional limit controls or low water
cutoffs installed on system.
44
CGi Series 2 Gas-Fired Water Boiler
Check/test . . . . . . .
.
gas leak
, per section
pressure reading
as the boiler and system heat up to
. If the air vent is
Figure 34
and briefly
A
and then release to
B
by twisting all the way
A
and then unscrewing
B
Expansion tank
1. Expansion tanks provide space for water to move in and
out as the heating system water expands due to
temperature increase or contracts as the water cools.
of this
5
Tanks may be open, closed or diaphragm or bladder type.
See section
best location of expansion tanks and air eliminators.
Open-type
baseboard unit, usually in the attic or closet. Has a gauge
glass and overflow pipe to a drain.
Closed-type
on
Tank is partially filled with water, leaving an air cushion
for expansion.
• Make sure this type of tank is fitted with a
such as the B & G Tank-Trol or Taco Taco-Trol. This
fitting reduces gravity 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.
system instead of returning to the tank. Eventually,
the tank will waterlog and no longer control
pressurization. The boiler relief valve will weep
Figure 34
frequently.
Automatic air
vent, typical Diaphragm- or bladder-type
rubber membrane to separate the tank pressurizing air
A
and the water. May be located at any point in the system,
B
but most often found near the boiler.
• Systems with this type of expansion tank require at
least one
top of an air eliminator, as shown in examples in
manual section
2. If relief valve has tended to weep frequently, the expansion
tank may be waterlogged or undersized.
71036
Closed-type tank
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
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.
annual start-up
(continued)
, pages 14-19 of this manual, for suggested
3
— located above highest radiator or
— welded gas tight and located above boiler.
The air will escape from the
— welded gas tight with a
, preferably located on
automatic air vent
, pages 14-19.
3
— tank is most likely waterlogged.
— first, check tank size to be
Part Number 550-110-710/0200
,
tank fitting