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3.5 Refrigerant Piping
Refrigerant pipe connections are located on the top of the unit.
Refrigerant piping external to the unit shall be sized in accordance
with the instructions of the outdoor equipment. When units are
recessed mounted in the wall, make certain that piping connections
are pressure tested prior to the wall being closed. While brazing, be
sure to protect the cabinet and grommets from heat damage.
3.6 Metering Device
All units are shipped and installed with throttle designed for air
conditioning operation. Pressures equalize after shut down. Some
outdoor models may require a start assist kit. See outdoor unit for
more information.
3.7 Blower
This unit is supplied with a multi-speed PSC motor with a direct
drive blower wheel which can obtain various air flows. The unit is
shipped with factory set cooling and heating speed taps. Airflow
performance tables are available for additional speed taps.
Disconnect all power to the unit before making any adjustments to
the motor speed taps. Be sure to check the air flow and the
temperature drop across the evaporator coil to ensure sufficient air
flow.
3.8 Wiring
Field wiring must comply with the National Electric Code (C.E.C. in
Canada) and any applicable local ordinance.
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.
3.8.1 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.
•
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 are
equipped with one 30-60 amp. circuit breaker. 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 protection.
•
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 requirements. Supply circuit protective
devices may be either fuses or "HACR" type circuit breakers.
• Power wiring may be connected to either the right or left side.
Two 7/8" 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.
3.8.2 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.
WARNING
•
Low voltage control connections are made to low voltage pigtails
extending from top of air handler (see Figure 1). Connections for
control wiring are made with wire nuts. Control wiring knockouts (7/8˝)
are also provided on the right and left side of the unit for side connec-
tion.
• 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.
3.8.3 GROUNDING
The unit must be permanently grounded. Failure to do so can
result in electrical shock causing personal injury or death.
• Grounding may be accomplished when installed in accordance with
electrical codes by bonding the metal conduit to the unit cabinet or by
attaching ground wire(s) to ground lug(s) provided in the unit wiring
compartment.
• Ground lug(s) are located close to wire entrance on left side of unit
(upflow). Lug(s) may be moved to marked locations near wire
entrance on right side of unit (upflow) if alternate location is more
convenient.
• Use of multiple supply circuits require grounding of each circuit to
lug(s) provided in unit.
3.9 Air Filter
An air filter must be installed before air enters the evaporator coil in
order to protect the coil, blower, and other internal parts from
excessive dirt and dust A filter must be installed. Consult the filter
manufacturer for proper sizing and maximum velocity requirements.
Filter Sizes
MODEL
18/24
30/36
3.10 Thermostat
Select a thermostat that is commonly used with HP or AC single
stage heating/cooling with electric heat. The thermostat will energize
the fan on a demand for heating or cooling.
Install the thermostat on an inside wall, away from drafts, lights or
other heat sources in a location that has sufficient air circulation from
other rooms being controlled by the thermostat. The thermostat
should be mounted 4 to 5 feet above the floor.
6
WARNING
FILTER SIZE IN [mm]
16Χ20[406Χ508]
20Χ20[508Χ508]
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