Grand Aire WATPM Series, Installation Instructions Manual

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7
4.3 GROUNDING
4. ELECTRICAL WIRING
Field wiring must comply with the National Electric Code (C.E.C. in
Canada) and any applicable local ordinance.
WARNING
Disconnect all power to unit before installing or servicing. More
than one disconnect switch may be required to de-energize the
equipment. Hazardous voltage can cause severe personal injury
or death.
4.1 POWER WIRING
It is important that proper electrical power is available for connection
to the unit model being installed. See the unit nameplate, wiring
diagram and electrical data in the installation instructions.
3.4 INSTALLATION IN AN UNCONDITIONED SPACE
IMPORTANT: There are two pairs of coil rails in the air handler for
default and counter flow application. If the air handler is installed in
an unconditioned space, the two unused coil rails should be removed
to minimize air handler surface sweating. The coil rails can be easily
removed by taking off the 6 mounting screws from both sides of the
cabinet.
4.2 CONTROL WIRING
IMPORTANT:
Class 2 low voltage control wiring should not be run in
conduit with main power wiring and must be separated from power
wiring, unless class 1 wire of proper voltage rating is used.
Low voltage control wiring should be 18 Awg. color-coded. For
lengths longer than 100 ft., 16 Awg. wire should be used.
Low voltage control connections are made to low voltage pigtails
within air handler control box.
See wiring diagrams attached to indoor and outdoor sections to
be connected.
Make sure, after installation, separation of control wiring and
power wiring has been maintained.
Grounding may be accomplished by grounding metal conduit
when installed in accordance with electrical codes to the unit
cabinet.
Grounding may also be accomplished by attaching ground
wire(s) to ground lug(s) provided in the unit wiring compartment.
Use of multiple supply circuits require grounding of each circuit to
lug(s) provided in unit.
Horizontal units must be configured for right hand air supply or left
hand air supply. Horizontal drain pan must be located under
indoor coil. Failure to use the drain pan can result in property
damage.
CAUTION
WARNING
The unit must be permanently grounded. FaIlure to do so can
result In electrical shock causing personal injury or death.
If required, install a branch circuit disconnect of adequate size,
located within sight of, and readily accessible to the unit.
IMPORTANT
: After the Electric Heater is installed, units may be
equipped with one or two 30-60 amp. circuit breakers. These
breaker(s) protect the internal wiring in the event of a short circuit
and serve as a disconnect. Circuit breakers installed within the
unit do not provide over-current protection of the supply wiring
and therefore may be sized larger than the branch circuit protec-
tion.
Supply circuit power wiring must be 75°C minimum copper
conductors only. See Electrical Data In this section for ampacity,
wire size and circuit protector requirement. Supply circuit protec-
tive devices may be either fuses or “HACR” type circuit breakers.
Power wiring may be connected to either the right, left side or top.
Three 7/8”, 1-3/8”, 1-3/4” dia. concentric knockouts are provided
for connection of power wiring to unit.
Power wiring is connected to the power terminal block in unit
electric cabinet.