6
Part Number 550-142-785/0812
GWI
Series 2
Gas-Fired Water Boilers –
Boiler Manual
Location
Natural gas
Propane gas
U. S.
Sea level –
2,000 ft
over
2,000 ft
Sea level –
2,000 ft
over
2,000 ft
2.00 mm
(Note 1)
1.30 mm
(Note 1)
Canada
Sea level –
2,000 ft
2,000 –
4,500
Sea level –
2,000 ft
2,000 –
4,500
2.00 mm
1.90 mm
1.30 mm
1.20 mm
Note 1: For U. S. elevations above 2,000 feet, contact your local supplier for
details.
1 Prepare boiler location
continued
Exhaust fans and air movers
The appliance space must never be under a negative pressure.
Always provide air openings sized not only to the dimensions
required for the firing rate of all appliances, but also to handle
the air movement rate of the exhaust fans or air movers using air
from the building or space.
Air openings
continued
2 Prepare boiler
Place boiler/crate near position
1. Leave boiler in crate and on pallet until installation 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 position.
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.
Placement and setup
Motorized air dampers
If the air openings are fitted with motorized dampers, electrically
interlock the damper to:
• Prevent the boiler from firing if the damper is not fully open.
• Shut the boiler down should the damper close during boiler
operation.
To accomplish this interlock, wire an
isolated contact
(proving the
damper open) in series with the thermostat input to the boiler.
The boiler will not start if this contact is open, and will shut down
should it open during operation.
The boiler contains ceramic fiber and fiberglass
materials. Use care when handling these materials
per instructions on page 48
of this manual. Failure
to comply could result in severe personal injury.
Inspect orifices and burners
1. Remove front jacket door. Remove base access panel (See
Figure 25, item 4, page 42
).
2. Check for correctly-sized manifold orifices. See
Table 3
for
sizing. (The orifice size is stamped on the orifice spud barrel.)
Correctly-sized manifold orifices must be used.
Failure to do so will result in severe personal injury,
death or substantial property damage.
3. Level and straighten burners.
Burners must be properly seated in slots in burner
rest with their openings facing up. Main burner ori
-
fices must inject down center of burner. Failure to
properly seat burners will result in severe personal
injury, death or substantial property damage.
4. Reinstall access panel.
Do not operate boiler without access 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.
Table 3
Manifold orifice sizing
