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boiler is approved for installation on combusti ble flooring in an
alcove with minimum clearances to combustibles of:
12” (305mm) Rear; 4” (102mm) Top and Sides; 6” (152mm) Vent.
2” (51mm) clearance is allowable from combustible construction
for hot water pipes.
Sufficient area should be provided at the front and rear of the
unit for prop er servicing. Service clearances of 24” (610mm) in
front, rear, top and sides are recommended. In a utility room
installa tion, the door opening should be wide enough to allow
the boiler to enter or to permit the replacement of another appli-
ance such as a boiler.
LEVELING
Because this unit is a Category IV appliance it produces some
amounts of condensation. The unit has a condensation disposal
system the requires this unit to be level to properly drain. Each
unit should be checked to be certain that it is level prior to
starting the unit.
If the unit is not level, obtain and insert shims under the feet at the
frame base to correct this condition.
AIR REQUIREMENTS
Breathing Hazard - Carbon Monoxide Gas
Install appliance in accordance with
the Instruction Manual and NFPA 54 or
CAN/CSA-B149.1.
To avoid injury, combustion and ventilation
air must be taken from outdoors.
Do not place chemical vapor emitting
products near water heater.
Breathing carbon monoxide can cause brain damage or
death. Always read and understand instruction manual.
UNCONFINED SPACE
In buildings of conventional frame, brick or stone construction,
unconfined spaces may provide adequate air for com bustion.
If the unconfined space is within a build ing of tight construction
(build ings using the following construction: weath er strip ping,
heavy insulation, caulk ing, vapor barrier, etc.), air for com bus-
tion, venti lation, and draft hood di lu tion must be obtained from
outdoors or spaces freely communicating with the outdoors. The
installation instructions for con fined spaces in tightly con structed
buildings must be followed to ensure adequate air supply.
UNUSUALLY TIGHT CONSTRUCTION
In unconfined spaces in buildings, infiltration may be adequate
to provide air for combustion, ventilation and dilution of flue
gases. However, in buildings of unusually tight construction (for
example, weather stripping, heavily insulated, caulked, vapor
barrier, etc.) additional air must be provided using the methods
described in the Confined Space section that follows.
CONFINED SPACE
A Confined Space is one whose volume is less than 50 cubic
feet per 1,000 Btu/hr (4.8 cm per kW) of the total input rating of
all appliances installed in the space.
Openings must be installed to provide fresh air for combustion,
ventilation and dilution in confined spaces. The required size for
the openings is dependent on the method used to provide fresh
3. In so far as is practical, close all building doors and windows
and all doors between the space in which the appliances
remaining connected to the common venting system are
located and other spaces of the building. Turn on clothes
dryers and any appliance not connected to the common
venting system. Turn on any exhaust fans, such as range
hoods and bathroom exhausts, so they will operate at
maximum speed. Do not operate a summer exhaust fan.
Close fireplace dampers.
4. Place in operation the appliance being inspected. Follow
the lighting instructions. Adjust thermostat so appliance will
operate continuously.
5. Test for spillage at the draft hood relief opening after 5 minutes
of main burner operation. Use the flame of a match or candle,
or smoke from a smoke pencil or similar implement.
6. After it has been determined that each appliance remaining
connected to the common venting system properly vents
when tested as outlined above, return doors, windows,
exhaust fans, fireplace dampers and any other gas-burning
appliance to their previous condition of use.
7. Any improper operation of the common venting system should
be corrected so installation conforms with the National Fuel
Gas Code, ANSI Z223.1/NFPA 54 or Natural Gas and Propane
Installation Code, CAN/CSA B149.1. When resizing any portion
of the common venting system, the common venting system
should be resized to approach the minimum size as determined
using the appropriate tables in Part 11 of the National Fuel
Gas Code, ANSI Z223.1/NFPA 54 or the Natural Gas and
Propane Installation Code, CAN/CSA B149.1.
PANELS AND COVERS
All panels and covers (e.g. control and junction box covers; front,
side and rear panels of boiler, see Figure 8) MUST be in place
after service and/or before opera tion of boiler. This will ensure
that all gas ignition components will be protected from water.
The VF is a low-pressure boiler (Category IV) to be used as
either hot water supply (domestic/commercial water heating) or
hot water heating (hydronic) application. Category IV appli ances
are often termed “High Effi ciency” appliances.
FIGURE 8.
CHEMICAL VAPOR CORROSION
Boiler corrosion and component failure can be caused by the
heating and breakdown of airborne chemical vapors. Spray can
propellants, cleaning sol vents, refrigerator and air conditioning
refrig erants, swimming pool chemicals, calcium and sodium
chloride (water softener salt), waxes, and process chemicals
are typical compounds which are potentially corrosive. These
materials are corrosive at very low concentration levels with little
or no odor to reveal their presence.
Products of this sort should not be stored near boiler. Also, air which is
brought in contact with boiler should not contain any of these chemicals.
If necessary, uncontaminated air should be obtained from remote or
outside sources. Failure to observe this requirement will void warranty.
INSTALLATION CLEARANCES
This boiler MUST NOT be installed on carpeted floors. This