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Part Number 550-142-300/0520
12
CGa Series 3 Gas-Fired Water Boiler — Boiler Manual
Inspect orifices and burners
1. Remove front jacket door. Remove base access panel
(See Figure 32, item 4, page 60).
2. Check for correctly-sized manifold orifices. See
Table 2 below for sizing. (The orifice size is stamped
on the orifice spud barrel.)
Place boiler/crate near
position
1. Leave boiler in crate and on pallet until installa-
tion site is ready.
2. Move entire crate and pallet next to selected location.
3. Remove crate. Leave boiler on pallet.
4. Remove boiler from pallet as follows:
a. Tilt left side of boiler up and place a board under
left legs.
b. Tilt boiler the other way and place a board under
right legs.
c. Slide boiler backwards off pallet and into posi-
tion.
Do not drop boiler or bump jacket
on floor or pallet. Damage to boiler
can result.
5. Check level.
a. Shim legs, if necessary.
b. Do not alter legs.
Orifice replacement procedure
(when required)
1. Remove access panel.
2. On gas manifold, mark location of main burner with
attached pilot assembly.
3. Remove main burner with attached pilot assembly
from manifold. Remove all remaining burners.
4. Remove and discard all main burner orifices in gas
manifold.
5. Apply a small amount of pipe dope to each of the
new orifices and install in the manifold. Make sure
the orifices are aligned correctly, not cross-threaded
in the manifold tappings.
Use only pipe dope compatible with
propane gas, even if boiler is to be
operated on natural gas. Failure to
comply could result in severe per-
sonal injury, death or substantial
property damage.
6. Reinstall main burner with attached pilot assembly
at location marked on gas manifold. Reinstall all
remaining burners.
7. Follow check-out procedure, Section
7, page 33.
Table 2 Manifold orifice sizing
Correctly-sized manifold orifices
must be used. Failure to do so will
result in severe personal injury,
death or substantial property dam-
age.
3. Level and straighten burners.
Burners must be properly seated in
slots in burner rest with their open-
ings face up. Main burner orifices
must inject down center of burner.
Failure to properly seat burners
will result in severe personal injury,
death or substantial property dam-
age.
4. Reinstall access panel.
Do not operate boiler without ac-
cess panel secured in place. Failure
to comply could cause momentary
flame rollout on ignition of main
flame, resulting in possible fire or
personal injury hazard.
Location Natural gas
U.S.
0-2,000 ft.
2.00 mm
over 2,000 ft.
(Note 1)
Canada
0-2,000 ft.
2.00 mm
2,000-4,500 ft.
1.90 mm
Location Propane gas
U.S.
CGa 25
CGa 3-8
0-2,000 ft.
#61
#56
over 2,000 ft.
(Note 1)
(Note 1)
Canada
CGa 25
CGa 3-8
0-2,000 ft.
#61
#56
2,000-4,500 ft.
.95mm
#57
Note 1: For elevations above 2,000 feet, contact your
Weil-McLain sales ofce for details.
Prepare boiler — placement and setup
2a
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