128 UV-PRC001-EN
Mechanical
Specifications
General
The classroom unit ventilator shall
be certified for ventilation at ARI
840 or tested by an independent
testing and balancing lab wit-
nessed by owner’s representative.
All non-ARI manufacturers shall
be within 10 percent of catalog air-
flow and capacities, or removal of
these units from the jobsite may
be required at the expense of the
manufacturer or contractor.
Cabinet
Cabinetry shall be16-gauge furni-
ture quality steel, with exposed
edges rounded. A 16-gauge re-
movable front panel with quick-
acting, key operated camlocks
shall be provided for service or
maintenance access. Steel bar dis-
charge grilles shall be welded in
place as an integral part of unit
structure. Internal parts and sur-
faces exposed to conditioned air
stream shall be insulated with
moisture resistant insulation.
Piping and control end pockets
shall be a minimum of 12-inches
wide to facilitate piping and ser-
vice. If standard end pocket is less
than 12-inches wide, an extended
cabinet unit shall be provided.
Cabinet insulation shall be 1/2-
inch thick dual density bonded
glass fiber. The exposed side shall
be a high density erosion proof
material suitable for use in air-
streams up to 4500 feet per minute
(FPM). Insulation shall meet the
following Underwriters’ Laborato-
ries Fire Hazard Classification:
• Flame Spread = 20
• Fuel Contributed = 15
• Smoke Developed = 0
Cabinet accessories shall include a
matching steel construction, rein-
forced for use with unit ventilators.
Steel alignment pins, adjustable
leveling bolts, shelves and option-
al sliding doors, kickplate, and wall
filler sections as required.
Access for inspection and cleaning
of the unit drain pan, coils and fan
section shall be provided. The unit
shall be installed for proper ac-
cess. Procedures for proper ac-
cess, inspection and cleaning of
the unit shall be included in the
maintenance manual.
Final finish shall be applied by an
electrostatic powder spray sys-
tem, with a minimum thickness of
1.5 mil with no visible run marks.
Each unit is supplied in one of sev-
en decorator colors as selected by
the architect.
Fan Board Assembly
The unit ventilator fan board as-
sembly shall be a single, rigid as-
sembly made from corrosion
resistive material. It shall include
the fans, fan housings, bearings,
fan shaft and motor. The fan motor
shall be mounted on the fan board.
Motors
The motors shall be a single speed
permanent split capacitor with
thermal overload protection. A
multiple tap auto transformer is
wired to the motor to provide dif-
ferent rpm settings and to ensure
rated capacity with all coil combi-
nations. The motor shall also be
provided with a quick-disconnect
plug and permanently lubricated
bearing.
Fans
Fans shall be centrifugal forward-
curved double width, double-inlet
corrosion resistant galvanized
wheels, statically and dynamically
balanced, direct driven. Fans shall
be in the blow-through configura-
tion.
Hydronic Coil and Drain Pans
All hydronic coils shall be plate-fin
type and manufactured by the unit
ventilator manufacturer. All hy-
dronic coils shall be hydrostatical-
ly tested to 350 psi and burst
tested to 450 psi. The coils shall be
rated in accordance with ARI 440
or 220.
The standard four pipe heating coil
shall be in the preheat location.
Optional four pipe heating coils
shall have the heating coil in the
reheat position so that it can be
controlled for dehumidification.
A drain pan shall be provided un-
der the cooling coil, with drain
connection. The drain pan shall be
easily removable for cleaning. The
drain pan shall be constructed of
corrosion resistant material, or
galvanized steel and insulated to
prevent sweating. The bottom of
the drain pan shall be sloped in
two planes which pitches the con-
densate to the drain connection.
The drain pan, when the unit is in-
stalled and trapped per the manu-
facturers installation manual, shall
be designed to leave puddles no
more than 2-inch in diameter and
no more than 1/8-inch deep no
longer than 3 minutes following
step 3 of the following test. The
test steps are:
1. Temporarily plug the drain
pan.
2. Fill the drain pan with 1/2” of
water or the maximum
allowed by the drain pan
depth, whichever is smaller.
3. Remove the temporary plug.
Electric Coil
Units equipped for electric heat
shall have a heating element con-
sisting of special resistance ele-
ments inserted in an extended
surface fin-tube bundle for maxi-
mum element life and safety. Units
equipped for electric heat shall in-
clude, as standard, a high temper-
ature cutout with a continuous
sensing element. This device inter-
rupts electrical power whenever
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