Titus RAB IOM - Manual (Page 4)

RAB Installation Manual
IOM-RAB-00 08-15-04
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Duct Insulation and Vapor Proofing
Previously installed heating supply ductwork may already
have adequate insulation against excessive heat loss.
This insulation may be satisfactory for protection against
heat gain from summer cooling. Depending upon
application, additional insulation may be required.
Externally insulated ductwork must have adequate vapor
seal for summer operation, especially where duct is
exposed to high humidity conditions.
Warning
Before installing unit, determine whether the unit
weight can be supported safely.
Possible injury and damage may result due to
joist/truss overloading.
When return air duct connection is smaller than return air
inlet opening, construct the transition piece so the vertical
and horizontal dimensions of transition do not increase
more than one inch for every seven inches of length.
Allow a minimum of three feet of straight ductwork
preceding equipment inlet
Sound Attenuation
Flexible duct connections should be used between the unit
and both the supply and return ducts. Requires unit
vibration isolation for suspended and base-mounted units.
Condensate Drain
Install unit with 1/8-inch pitch toward condensate drain
opening. Condensate drain must consist of a minimum of
¾-inch copper tubing, ¾-inch galvanized pipe, or ¾-inch
PVC pipe. Figure 3 shows condensate drain setup. The
drain trap must be properly configured to ensure the
removal of all condensate runoff. Ensure drain pitches
downward at a slope of one inch every 10 feet.
Note 1: Incorrect trapping can hold water in pan,
causing overflow.
Note 2: Consult local codes for additional precautions
before installing condensate pan.
Water Piping
All piping must be supported, independent of coils. Swing
joints or flexible fittings must be provided to absorb
expansion and contraction strains. Rigid piping reduces
the effectiveness of vibration isolators. The water supply
should always be connected so the entering water is on
the leaving airside of the coil. Coils must be adequately
vented in order to prevent air binding. See Figure 4.
Note: Freeze-ups due to low air temperatures are not
covered under the warranty agreement.
Figure 3. Condensate Drain
Figure 4. Water Piping
Motors and Drives
Units are normally shipped with motor and drive installed.
However; when mounting a motor on the adjustable base
in the field, use extreme care to ensure proper alignment
and belt tension.
Electrical Connections
Each unit has a mounted control box and, typically, the
motor is to be wired to this box. Only ODP, single- and
three-phase motors on 800 to 2000 CFM units are factory-
wired to junction box. All other motors require field wiring
to junction box located on side of the unit cabinet.
Note: Unit must be permanently grounded in
accordance with NEC and local codes and
ordinances. See the typical wiring diagrams shown in
Figure 5.