Weil-McLain GOLD CGa Manual page 47

GOLD CGa Gas-Fired Water Boiler — Boiler Manual
10b
Service & maintenance – annual start-up
Gas piping
1. Sniff near floor and around boiler area for any in-
dication of a
2.
of this manual, if there is any indication of a leak.
Cold fill and operating pressures
1. While the system is cold, note the
cold fill pressure is correct.
2.
up to ensure pressure rise is normal. Too high a rise
would indicate a waterlogged or undersized expan-
sion 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
the valve seat.
4. Replace cap
and then unscrewing one turn.
Limit controls and cutoffs
eration by turning control set point below boiler
original setting.
2. Inspect and test additional limit controls or low
water cutoffs installed on system.
Part Number 550-101-009/0107
Check/test
.
as the boiler and system heat
. If the air vent is leaking, remove cap
and briefly push valve and then release to clean
by twisting all the way onto valve
Automatic air vent, typical
Expansion tank
1. Expansion tanks provide space for water to move in
an out as the heating system water expands due to
temperature increase or contracts as the water cools.
Tanks may be open, closed or diaphragm or bladder
type. See Section of this manual for suggested best
location of expansion tanks and air eliminators.
per Section
gauge glass and overflow pipe to a drain.
boiler. Tank is partially filled with water, leaving an
air cushion for expansion.
Taco-Trol. This fitting reduces gravity circula-
tion of air-saturated tank water back to the
system and prevents the air from bubbling up
through the water as it returns from the sys-
tem.
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.
with a rubber membrane to separate the tank pres-
surizing air and the water. May be located at any
point in the system, but most often found near the
boiler.
at least one
cated on top of an air eliminator, as shown in
examples in manual Section .
2. If relief valve has tended to weep frequently, the ex-
pansion tank may be waterlogged or undersized.
logged. 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.
size to be sure it is large enough for the system. If
-
size is too small, add additional tank(s) as neces-
sary to provide sufficient expansion. If tank size is
large enough, remove tank from system and check
charge pressure (usually 12 psig for residential ap-
plications). If tank won't hold pressure, membrane
has been damaged. Replace tank.
— located above highest radiator or
— welded gas tight and located above
Tank-Trol or Taco
The air will escape
— welded gas tight
, preferably lo-
— tank is most likely water-
— first, check tank
(cont.)
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