Weil-McLain CGa 3 Series Manual page 29

CGa Series 3 Gas-Fired Water Boiler — Boiler Manual
6a
Start-up — preparation
Fill the system with water
1. Close manual and automatic
drain cock.
Fill to correct system pressure.
2.
will vary with each application. Typical cold water
fill pressure for a residential system is 12 psi.
3. Purge air
a. Connect a hose to the purge valve (see drain
valves, item
on pages 17 through 23,
ure 16
drain and be seen.
b. Close the boiler or system isolation valve be-
tween the purge valve and fill connection to the
system.
c. Close zone isolation valves.
d. Open quick-fill valve on cold water makeup line.
e. Open purge valve.
f. One zone at a time, open the isolation valves.
Allow water to run through the zone, pushing
out the air. Run until no noticeable air flow is
present. Close the zone isolation valves and pro-
ceed with the next zone. Follow this procedure
until all zones are purged.
g. Close the quick-fill water valve and purge valve
and remove the hose. Open all isolation valves.
Watch that system pressure rises to correct cold-
fill pressure.
h. After the system has operated for a while, elimi-
nate any residual air by using the manual air
vents located throughout the system.
i. If purge valves are not installed in system, open
manual air vents in system one at a time, begin-
ning with lowest floor. Close vent when water
squirts out. Repeat with remaining vents.
4. Open
bladder-type expansion tank systems only) one
turn.
5. Open other vents:
a. Starting on the lowest floor, open air vents one
at a time until water squirts out.
b. Repeat with remaining vents.
6. Refill to correct pressure.
Part Number 550-142-300/0520
air vents
Correct pressure
from system:
6
, in suggested piping diagrams
Figure 9
). Route hose to an area where water can
automatic air vent
(diaphragm-type or
(continued)
Inspect system water piping
and boiler
After filling the boiler and system with water,
all piping
repair immediately. Repeat this inspection after the
boiler has been started and the system has heated up.
Fig-
through
Inspect base insulation
Check to make sure
all four sides of the base. If insulation is damaged or
do not
displaced,
insulation.
throughout the system for leaks. If found,
Leaks must be repaired at once.
Failure to do so can damage the
boiler, resulting in substantial
property damage.
petroleum-based
Do not use
cleaning or sealing compounds
in boiler system. Severe damage
to boiler will occur, resulting in
substantial property damage.
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.
Failure to replace
sulation or reposition insulation
can result in a fire hazard, causing
severe personal injury, death or
substantial property damage.
base insulation is secure
operate boiler. Replace or reposition
inspect
damaged in-
against
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