User`s manual

—
9
—
Contact your LP gas supplier or regulator manufacturer for
further details regarding tank sizing, recommended regula-
tor settings, and pipe sizing.
Special pipe compound must be used when assembling pip-
ing for LP gas, as white lead or commercial compounds will
be dissolved easily. Use a shellac-based compound suitable
for use with LP.
D. Field Duct Connections
NOTE: The design and installation of the duct system must
be in accordance with the standards of the NFPA for
the installation of nonresidence-type air conditioning and
ventilating systems, NFPA No. 90A or residence-type, NFPA
No. 90B; and/or local codes and ordinances.
Adhere to the following criteria when selecting, sizing, and
installing the duct system:
1. Remove appropriate panels from unit to obtain either
horizontal or vertical discharge. If units are installed
in horizontal discharge applications, remove vertical
discharge duct covers, save screws, and install covers
on vertical duct openings.
2. Select and size ductwork, supply-air registers, and
return-air grilles according to ASHRAE (American
Society of Heating, Refrigeration and Air Condition-
ing Engineers) recommendations.
3. Use flexible transition between rigid ductwork and
unit to prevent transmission of vibration. The transi-
tion may be screwed or bolted to duct flanges. Use
suitable gaskets to ensure weather- and airtight seal.
4. When horizontal return is used, install external,
field-supplied air filters in return-air ductwork where
they are easily accessible for service. Recommended
filter sizes are shown in Table 1.
5. Size all ductwork for maximum required airflow
(either heating or cooling) for unit being installed.
Avoid abrupt duct size increases or decreases.
6. Adequately insulate and weatherproof all ductwork
located outdoors. Insulate ducts passing through
unconditioned space, and use vapor barrier in accor-
dance with latest issue of SMACNA (Sheet Metal and
Air Conditioning Contractors National Association)
and ACCA (Air Conditioning Contractors of America)
minimum installation standards for heating and air-
conditioning systems. Secure all ducts to building
structure.
7. Flash, weatherproof, and vibration isolate all open-
ings in building structure in accordance with local
codes and good building practices.
NOTE: If accessory thru-the-bottom connections are
used, refer to the accessory installation instructions for
installation.
E. Electrical Connections
Field Power Supply (Fig. 13 and 14)
1. Make all electrical connections in accordance with
NEC ANSI/NFPA, latest edition, and local electrical
codes governing such wiring. In Canada, all electrical
connections must be in accordance with CSA Stan-
dard C22.1 Canadian Electrical Code Part 1 and
applicable local codes. Refer to unit wiring diagram.
2. Use only copper conductor for connections between
field-supplied electrical disconnect switch and unit.
Maximum wire size is no. 2 AWG (American Wire
Gage).
3. Voltage to compressor terminals during operation
must be within voltage range indicated on unit name-
plate (also see Table 2). On 3-phase units, voltages
between phases must be balanced within 2% and
the current within 10%. Use the formula shown in
Table 2, Note 2 to determine the percent voltage
imbalance. Operation on improper line voltage or
excessive phase imbalance constitutes abuse and may
cause damage to electrical components. Such opera-
tion would invalidate any applicable warranty.
4. Insulate low-voltage wires for highest voltage con-
tained within conduit when low-voltage control wires
are run in same conduit as high-voltage wires.
5. Do not damage internal components when drilling
through any panel to mount electrical hardware, con-
duit, etc.
CAUTION: When drilling the duct system fasten-
ing holes into the side of the unit for duct flanges, use
extreme care not to puncture the coil or coil tubes. See
Fig. 12.
WARNING: The unit cabinet must have an unin-
terrupted, unbroken electrical ground to minimize the
possibility of personal injury if an electrical fault
should occur. This ground may consist of electrical wire
connected to the unit ground lug in the control com-
partment, or conduit approved for electrical ground
when installed in accordance with the NEC (National
Electrical Code) ANSI/NFPA, latest edition, (in Can-
ada, Canadian Electrical Code CSA [Canadian Stan-
dards Association] C22.1) and local electrical codes. Do
not use gas piping as an electrical ground. Failure to
adhere to this warning could result in personal injury.
CAUTION: Failure to adhere to the following elec-
trical connection procedures could result in damage to
the unit being installed:
Fig. 12 — Location of Coil Area Not to be Drilled