SECTION 15847
KITCHEN MAKEUP AIR UNIT
PART 1 - GENERAL
1.01
GENERAL
A.
1.02
SCOPE
A.
1.03
1.04
The Bidding and Contract Requirements, Division 1 - General Requirements,
Section 15010 - General Provisions, and Section 15050 - Basic Materials and
Methods shall apply to this Section.
Install a complete factory assembled kitchen makeup air unit with a direct gas fired
preheater.
QUALITY ASSURANCE
A.
Conform to AMCA Bulletins regarding construction and testing. Fans shall bear
AMCA certified rating seal.
B.
Provide fans with U/L label. Provide furnaces design-certified by the American
Gas Association (AGA) and bear the AGA label.
SUBMITTALS
Provide shop drawings on this equipment as described in Section 15010 - 1.04.
PART 2 - PRODUCTS
2.01
ACCEPTABLE MANUFACTURERS
The kitchen makeup air unit shall be manufactured by GREENHECK. Units fully equal to
the specified manufacturer by CAPTIVEAIRE are acceptable.
2.02
KITCHEN VENTILATION UNITS
A.
Supply:
1.
Filtered makeup air units shall have belt driven double width/double inlet,
forward curved centrifugal type supply fans. The entire fan and motor
assembly shall be mounted on vibration isolators to prevent noise
transmission. Motors shall be permanently lubricated, heavy duty, ball
bearing type, carefully matched to the fan load and furnished at the
specified voltage, phase and enclosure. The fan shaft shall be ground
and polished steel mounted in heavy duty, sealed ball bearings. Bearings
shall be selected for a minimum average life in excess of 200,000 hours of
maximum cataloged operating speeds. Pulleys shall be of the fully
machined, cast iron type, keyed and securely attached to the wheel and
motor shafts. Motor sheaves shall be adjustable for final system
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KITCHEN MAKEUP AIR UNIT
SECTION 15847
balancing. Drives shall be sized for a minimum of 150% of driven
horsepower.
B.
2.
Fan wheels shall be of the forward curved type, constructed of heavy
gauge steel and statically and dynamically balanced to ensure smooth,
vibration free operation.
3.
Housing construction shall be heavy gauge galvanized steel with
removable panels for access to fan and tempering unit components, filters
and controls.
4.
Filter Section - Low velocity medium capacity filter section shall be a
matching part of the unit with access through hinged doors on both sides.
Filters shall be 2" FARR 30/30, medium efficiency, pleated, disposable
type. Each filter shall consist of a non-woven cotton fabric media, media
support grid and enclosing frame. The filter media shall have an average
efficiency of 30-35% of ASHRAE Test Standard 52-76. It shall have an
average arrestance of not less than 92% in accordance with that test
standard. The filter shall be listed by Underwriter's Laboratories as Class
2. Two complete sets of spare filters shall be supplied.
5.
The prewired control center shall include, but not be limited to, an integral
master disconnect switch with fuse blocks for main power connection,
magnetic motor starters with thermal overloads and manual reset, fused
115 volt control transformer, and distribution terminal control strip for
control wiring connection. All electrical components shall be U/L listed,
Approved or Classified where applicable and wired in compliance with the
National Electrical Code. Wiring shall be complete, requiring only
one-point field connection for power service and one-point field connection
for low voltage.
Exhaust:
1.
Roof exhaust fans shall be of the belt drive, upblast, vertical discharge
type. Housings shall be constructed of heavy gauge aluminum. The
windband shall have a rolled bead and additional structural members for
added strength. The fan wheel shall be of the backward inclined,
centrifugal type, constructed of aluminum and statically and dynamically
balanced for smooth, vibration free operation.
2.
Motors and drives shall be isolated from the airstream. Motors shall be
permanently lubricated, heavy duty, ball bearing type, carefully matched to
the fan load and furnished at the specified voltage, phase and enclosure.
Motors shall be cooled by air drawn from outside the exhaust airstream.
3.
The fan shaft shall be ground and polished steel mounted on heavy duty
ball bearings. Bearings shall be selected for a minimum average life in
excess of 200,000 hours at maximum cataloged operating speeds.
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KITCHEN MAKEUP AIR UNIT
C.
D.
SECTION 15847
4.
Pulleys shall be of the fully machined cast iron type, keyed and securely
attached to the wheel and motor shafts. Motor sheaves shall be
adjustable for final system balancing. Drives shall be sized for a minimum
of 150% of driven horsepower. The entire fan and motor assembly shall
be mounted on vibration isolators to prevent noise transmission.
5.
The roof exhaust fans shall bear the AMCA certified ratings seals for air
and sound performance.
Heater:
1.
Provide a direct gas fired preheater. The preheater shall be supplied as
an integral part of the makeup air unit.
2.
The heater shall include, but not be limited to, a cast iron and stainless
steel burner, gas valve with sensor, main and pilot electric gas valves and
pressure regulators, main and pilot manual shutoff valves, an air flow
switch, high limit control, flame safeguard control, flame rod, and electronic
ignition pilot.
Roof Curb: Provide prefabricated 12" roof curb lined with fiberglass insulation.
Provide heavy gauge galvanized steel equipment supports.
PART 3 - EXECUTION
3.01
INSTALLATION
A.
Supply and install sheaves as necessary for final air balancing.
B.
Set roof mounted fans on curbs. Provide acoustic insulation on duct to below roof
line and on fan inlet plenum, and drip pan for collecting condensation.
C.
Provide a spare fan belt for each makeup air unit.
D.
Provide a typed list of all the different makeup air units and their filter and fan belt
sizes and submit to the Owner two copies of the list distributed to:
1.
Project Manager, Office of Design and Construction Services, Gatehouse
Administrative Center, 8115 Gatehouse Road, Suite 3500, Falls Church,
VA 22042.
2.
Coordinator, Mechanical Maintenance Division, Maintenance Services,
5025 Sideburn Road, Fairfax, Virginia 22032.
3.
Include list in the Operation and Maintenance manuals.
END OF SECTION
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