U.S. Boiler Company Alpine ALP500C, Installation, Operating And Service Instructions

Page: 36 / 144

36
iV. Venting
(continued)
Warning
Sources of combustion air contaminants,
including chlorines, chlorofluorocarbons
(CFC’s), petroleum distillates, detergents, volatile
vapors or other chemicals must not be present in
the boiler room. if any of these contaminants is
present, severe boiler corrosion and failure will
result.
2. Outdoor Openings to Boiler Room
a. Provide combustion and ventilation air to the
boiler room or enclosure . Follow the National
fuel Gas Code , ANSI Z223.1, or, in Canada,
Installation Code for Gas Burning Appliances
and Equipment, CGA Standard B149 Code as
well as all applicable local codes. Use one of the
following two methods.
b. Two Permanent Openings Method: Provide
two permanent openings, once within 12 in. (300
mm) of the top of the enclosure and one within
12 in. (300 mm) of the bottom of the enclosure.
Openings must communicate directly, or by
ducts, with the outdoors or spaces that freely
communicate with the outdoors, as follows:
i.
Direct communication or through vertical
ducts: minimum free area of each opening
shall be 1 in.
2
/4000 Btu/hr (550 mm
2
/kW) of
total input rating of all appliances within the
enclosure.
ii. Horizontal ducts: minimum free area of
each opening shall be 1 in.
2
/2000 Btu/hr
(1100 mm
2
/kW) of total input rating of all
appliances within the enclosure.
c. One Permanent Opening Method: Provide
one permanent opening, commencing within 12
in. (300 mm) of the top of the enclosure. The
opening shall communicate through a vertical
or horizontal duct to the outdoors or spaces that
freely communicate with the outdoors and shall
have a minimum free area of the following:
i. 1 in.
2
/3000 Btu/hr (700 mm
2
/kW) of total
input rating of all appliances located within
the enclosure.
ii.
Not less than the sum of the areas of all vent
connectors in the space.
d. Motorized Louvers or Dampers:
Motorized
louvers or dampers must be interlocked with
the boiler to allow ignition and firing of the
burner only when louvers are in the fully-open
position. Wire the interlock to the Auto Reset
External Limit connections. See Section VIII
“Electrical”.
3. Terminations
a. For standard horizontal sidewall terminations,
see Figures 7 and 8. When using room air for
combustion, use 90° elbow or tee for sidewall
vent termination.
nOTiCE
Use 90° elbow or tee for horizontal sidewall vent
termination when using room air for combustion.
b. For vertical roof terminations, see Figures 10 and
11.
F. Removing the Existing Boiler
When an existing boiler is removed from a common
venting system, the common venting system is likely
to be too large for proper venting of the remaining
appliances. At the time of removal of an existing
boiler, the following steps shall be followed with each
appliance remaining connected to the common venting
system placed in operation, while the other appliances
remaining connected to the common venting system are
not in operation.
1. Seal any unused openings in the common venting
system.
2. Visually inspect the venting system for proper
size and horizontal pitch and determine there is no
blockage or restriction, leakage, corrosion, and other
deficiencies which could cause an unsafe condition.
3. Insofar 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 maxi mum
speed. Do not operate a summer exhaust fan. Close
fireplace dampers.
4. Place in operation the appliance being inspected.
Follow the Lighting (or Operating) Instructions.
Adjust thermo stat 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 cigarette,
cigar or pipe.
6. After it has been determined that each appliance
remain ing connected to the common venting system
properly vents when tested as outlined above, return
doors, win dows, exhaust fans, fireplace dampers and
any other gas burning appliance to their previous
conditions of use.