Equipment Ventilation & Combustion Air Requirements - FULTON VSRT Series Installation And Operation Manual

2 - INSTALLATION
Equipment Ventilation & Combustion
Air Requirements
Ventilation must be sufficient to maintain a building
temperature of 120 F (49 C) or less and the panel box
temperature must not exceed 125 F (52 C). Consistent,
proper ventilation of the equipment room is essential
for good combustion. Install two fresh air openings,
one at a low level, 24 in (610 mm) from the floor, and
one at a higher level on the equipment room wall. This
will provide a flow of air to exhaust the hot air from
the equipment room. Ventilation in the room must be
sufficient to provide adequate air flow throughout the
room. Good venting practices must be followed to ensure
adequate air movement throughout the entire room.
! CAUTION
A temperature exceeding 120 F (49 C) in the boiler
room may cause premature failure of electrical
components. Provisions should be made to maintain
an ambient temperature of 120 F (49 C) or less (the
panel box interior should not exceed 125 F [52 C]).
For proper combustion, the burner must have an
adequate supply of fresh air. Based on National Board
Inspection Code (NBIC) recommendations, unobstructed
air openings shall be sized on the basis of 1.0 square
inch of free area per 2,000 BTU/hr of the maximum fuel
input of the combined burners in the equipment room,
or as specified by applicable national or local codes. The
equipment room air supply openings shall be kept clear
at all times. Please note that the required opening is the
required "free space" opening.
See Table 4 for minimum make-up air required and the
recommended area of each opening for each model.
Table 4 - Minimum Make Up Air Requirements and
Recommended Area of Each Opening for Vents
Unit Size Minimum Make Up Air
(BHP) Requirements (SCFM)*
10 88
15 134
20 177
30 242
40 353
50 442
60 530
*Minimum make-up air requirements are based on a maximum of 25%
excess air at high fire at 60˚ ambient temperature.
2-16
VSRT_IOM_2018-1213
**Opening areas are calculated based input of a single boiler and do
not account for the ventilation needs of the equipment room. These
measurements are subject to state and location regulations. (one square
inch of free area per 2,000 BTU/hr input per NBIC). Free opening area must
take into account the space taken up by louvers, expanded metal, etc.
If positive forced ventilation (make-up air flow) is
adopted, you must ensure that there will be no
appreciable pressure variation in the equipment room.
Adhere to the following to meet ventilation and
combustion air requirements:
Free Opening
Area in **
2
200
300
400
600
800
1,000
1,196
1. Install two fresh air openings, one at a low level,
24" (610 mm) from the floor, and one at a higher
level on the equipment room wall. This will
provide a flow of air to exhaust the hot air from
the equipment room.
2. Avoid ventilation which creates a negative
pressure for boiler combustion air, as it will
seriously affect combustion and proper
operation of the stack. The equipment requires
a steady neutral or slightly positive combustion
air supply. Unless sealed combustion is used, the
installation of an exhaust fan in a boiler room
is not recommended. An exhaust fan, or similar
equipment, can create down draft in the stack, or
restrict the burner's air supply, which will result in
poor combustion or nuisance failures.
3. It is essential that only fresh air be allowed to enter
the combustion air system. Foreign substances
in the combustion system can create hazardous
conditions. Particulate matter like lint, combustible
volatiles, dust, smog or chemicals (example,
perchlorethlylene, halogenated compounds)
in the combustion air supply to the equipment
will cause damage or failure of the burner and
is not covered under warranty. Use of a cyclone
separator (VSRT) will separate solid particles. It
will not separate any chemical fumes. Eliminate
potential for high risk situations for particulate
matter to be in the air supply (e.g., as the result
of construction or maintenance activities). If
foreign substances can enter the air stream, the
combustion air inlet must be piped to an outside
location. Failure to do so will void the warranty.
4. VSRT Boiler is capable of ducted combustion
air. Reference Figure 16 and 17 at the end of the
section. Note that with ducted combustion air,
proper room ventilation is still required.
© Fulton 2018