Columbia CEG-C, Инструкция по установке, эксплуатации и обслуживанию

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5
VENTILATION & COMBUSTION AIR
!
WARNING
Air openings to combustion area must
not be obstructed. Following instructions
below, adequate combustion air can be
maintained.
Provide combustion air and ventilation air in
accordance with the section “Air for Combustion and
Ventilation,” of the National Fuel Gas Code, ANSI
Z223.1 / NFPA 54, or applicable provisions of local
building codes.
Provide make-up air where exhaust fans, clothes
dryers, and kitchen ventilation equipment interfere
with proper operation.
National Fuel Gas Code recognizes several methods
of obtaining adequate ventilation and combustion air.
Requirements of the authority having jurisdiction may
override these methods.
• Engineered Installations. Must be approved by
authority having jurisdiction.
• Mechanical Air Supply. Provide minimum of
0.35 cfm per Mbh for all appliances located
within space. Additional requirements where
exhaust fans installed. Interlock each appliance
to mechanical air supply system to prevent main
burner operation when mechanical air supply
system not operating.
• All Indoor Air. Calculate minimum volume for all
appliances in space. Use a different method if
minimum volume not available.
A. Standard Method. Cannot be used if known
air in fi ltration rate is 0.40 air changes per
hour. See Table 1 for space with boiler only.
Use equation for multiple appliances.
Volume ≥ 50 ft
3
x Total Input [Mbh]
B. Known Air In fi ltration Rate. See Table 1
for space with boiler only. Use equation
for multiple appliances. Do not use an air
in fi ltration rate (ACH) greater than 0.60.
Volume ≥ 21 ft
3
⁄ ACH x Total Input [Mbh]
C. Refer to National Fuel Gas Code for opening
requirements between connected indoor
spaces.
• All Outdoor Air. Provide permanent opening(s)
communicating directly or by ducts with outdoors.
A. Two Permanent Opening Method. Provide
opening commencing within 12 inches of top
and second opening commencing within 12
inches of bottom of enclosure.

Direct communication with outdoors or
communicating through vertical ducts.
Provide minimum free area of 1 in² per 4
Mbh of total input rating of all appliances
in enclosure.

Communicating through horizontal ducts.
Provide minimum free area of 1 in² per 2
Mbh of total input rating of all appliances
in enclosure.
B. One Permanent Opening Method. Provide
opening commencing within 12 inches of top
of enclosure. Provide minimum clearance of
1 inch on sides/back and 6 inches on front
of boiler (does not supersede clearance to
combustible materials).
C. Refer to National Fuel Gas Code for additional
requirements for louvers, grilles, screens and
air ducts.
• Combination Indoor and Outdoor Air. Refer
to National Fuel Gas Code for application
information.
Table 1 - Minimum Room Volume, Indoor Air Only*
Input Mbh
Standard
Method
Known Air In fi ltration Rate Method (Air Changes Per Hour)
0.1 .02 .03 .04 .05 .06
112.5 5625 23625 11813 7875 5906 4725 3938
150 7500 31500 15750 10500 7875 6300 5250
187 9350 39270 19635 13090 9818 7854 6545
255 11250 47250 23625 15750 11813 9450 7875
262.5 13125 55125 27563 18375 13781 11025 9188
300 15000 63000 31500 21000 15750 12600 10500
* Table values based on boiler only. Add volume for any additional appliances.