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GWA

Gas-Fired Water Boilers –

Boiler Manual

Part Number 670 01 1001 00

Air openings

continued

Prepare boiler

Table 3

Manifold orifice sizing

Place boiler/crate near position

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

3. Level and straighten burners.

Burners must be properly seated in slots in burner
rest with their openings 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 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.

Inspect orifices and burners

1. Remove front jacket door. Remove base access panel (See

Figure 17, item 4, page 30).

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.

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.

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.

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

# 49

1.30 mm

# 56

Note 1:

For U. S. elevations above 2,000 feet, contact your International Com-
fort Products supplier for details.

GWA

Gas-Fired Water Boilers –

Boiler Manual

Part Number 670 01 1001 00

Figure 18

Jacket assembly

12 Replacement parts

continued

The boiler contains ceramic fiber and fiberglass materials. Use care when handling these materials per
instructions on page 23 of this manual. Failure to comply could result in severe personal injury.

Item
number

Description

International

Comfort

Products

part number

Junction box, 4 x 4
(Available at local supply house)

Junction box, 2 x 4
(Available at local supply house)

Jacket panel, left side, with
insulation

431223425WT

Jacket panel, right side, with
insulation

431223426WT