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Electrical Wiring
Electrical Connections
Electrical wiring and grounding must be installed in accordance
with local codes or, in the absence of local codes, with the
National Electrical Code ANSI/NFPA 70, Latest Revision.
Disconnect Switch
•Provide an approved weather-proof disconnect either on the
side of the unit or within close proximity and
within sight of the
unit.
Over Current Protection
•The branch circuit feeding the unit must be protected as shown
on the unit rating plate.
Power Wiring
•The power supply lines must be run in weathertight conduit to
the disconnect and into the bottom of the unit control box.
Provide strain relief for all conduit with suitable connectors.
•Provide flexible conduit supports whenever vibration trans-
mission may cause a noise problem within the building struc-
ture.
•Ensure all connections are made tight. See Figures 5 and 6:
Typical Field Wiring Diagrams.
•NOTES:
1.
For branch circuit wiring (main power supply to the unit
disconnect), wire size for the length of run should be
determined using the circuit ampacity found on the unit
nameplate and the N.E.C.
2.
For more than 3 conductors in a raceway or cable, see the
N.E.C. for derating the ampacity of each conductor.
3.
Wire size is based on 75 degrees C rated wire insulation.
Grounding
•The unit must be electrically grounded in accordance
with local codes or the National Electrical Code.
▲
WARNING:
TO PREVENT INJURY OR DEATH
DUE TO ELECTRICAL SHOCK OR CONTACT WITH MOVING
PARTS. LOCK UNIT DISCONNECT SWITCH IN OPEN
POSITION BEFORE SERVICING UNIT.
Ground Level -- Horizontal
For ground level installations, the unit should be positioned on
a pad the size of the unit or larger. The unit must be level on the
pad. The pad must not come in contact with the structure. Be
sure the outdoor portion of the supply and return air ducts are as
short as possible.
Proceed with the installation as follows:
1. Place the unit on the pad.
2. Attach the supply and return air ducts to the unit.
3. Insulate any ductwork outside of the structure with at least
2 inches of insulation and weatherproof. There must be a
weatherproof seal where the duct enters the structure.
4. Complete the installation according to the instructions in the
following sections of this manual.
Installation
Condensate Drain Piping
A 3/4-inch female NPT condensate drain connection is provided
on the evaporator access panel end of the unit. See Figure 4.
Provide a trap and fill it with water before starting the unit to
avoid air from being drawn through. Follow local codes and
standard piping practices when running the drain line. Pitch the
line downward away from the unit. Avoid long horizontal runs.
See Figure 2
NOTE:
Do not use reducing fittings in the drain lines. The
condensate drain must be:
●
Made of 3/4" pipe size.
●
Pitched 1/4" per foot to provide free drainage to convenient
drain system.
●
Trapped.
●
Must not be connected to closed drain system.
3
/
4
" PVC OR COPPER
TUBING AND FITTINGS
1-1/2"
MIN.
2
ATTACHING HORIZONTAL DUCTWORK
TO UNIT
All conditioned air ductwork should be insulated to minimize
heating and cooling duct losses. Use a minimum of two (2) inches
of insulation with a vapor barrier. The outside ductwork must be
weatherproofed between the unit and the building.
When attaching ductwork to a horizontal unit, provide a flexible
watertight connection to prevent noise transmission from the unit to
the ducts.
Note:
Duct flanges are located in blower and heater compartment.
