WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in result in personal injury or death.
The unit cabinet must have an uninterrupted, unbroken electrical ground to minimize the possibility of personal
injury if an electrical fault should occur. This ground may consist of an electrical wire connected to the unit ground
screw in the control compartment, or conduit approved for electrical ground when installed in accordance with
NEC, National Fire Protection Association and local electrical codes.
Condensate water can be drained directly onto the roof in rooftop installations (where permitted) or onto a gravel
apron in ground level installations. Install a field--supplied condensate trap at end of condensate connection to ensure
proper drainage. Make sure that the outlet of the trap is at least 1 in. (25.4 mm) lower than the drain pan condensate
connection to prevent the pan from overflowing (See Fig. 3 and Fig. 4). When using a gravel apron, make sure it
slopes away from the unit.
If the installation requires draining the condensate water away from the unit, install a 2-in. (50.8 mm) trap using a 3/4-
in. (19 mm) ID tubing or pipe. (See Fig. 3 and 4.) Make sure that the outlet of the trap is at least 1 in. (25.4 mm) lower
than the unit drain-pan condensate connection to prevent the pan from overflowing. Prime the trap with water. Connect
a drain tube using a minimum of 3/4-in. (19.1 mm) PVC, 3/4-in. (19.1 mm) CPVC, or 3/4-in. (19.1 mm) copper pipe (all
field supplied). Do not undersize the tube. Pitch the drain tube downward at a slope of at least 1 in. (25.4 mm) for
every 10 ft (3 m) of horizontal run. Be sure to check the drain tube for leaks. Prime trap at the beginning of the cooling
season start-up. Allowable glues for condensate trap connection are: Standard ABS, CPVC, or PVC cement.
Fig. 3 - Condensate Trap
Fig. 4 - PVC Condensate Trap
Step 6 — Install Electrical Connections
HIGH-VOLTAGE CONNECTIONS - The unit must have a separate electrical service with a field-supplied, waterproof
disconnect switch mounted at, or within sight from the unit. Refer to the unit rating plate, NEC and local codes for
maximum fuse/circuit breaker size and minimum circuit amps (ampacity) for wire sizing.
The field-supplied disconnect may be mounted on the unit over the high-voltage inlet hole when the standard power
and low-voltage entry points are used. See Fig. 5 and 6 for acceptable location.
Operation of unit on improper line voltage constitutes abuse and may cause unit damage that could affect warranty.
Caution
UNIT COMPONENT DAMAGE HAZARD
Failure to follow this caution may result in result in damage to the unit being installed.
1. Make all electrical connections in accordance with NEC and local electrical codes governing such wiring. Refer
to unit wiring diagram.
2. Use only copper conductor for connections between field-supplied electrical disconnect switch and unit.
DO NOT USE ALUMINUM WIRE.
3. Be sure that high-voltage power to unit is within operating voltage range indicated on unit rating plate.
On 3-phase units, ensure phases are balanced within 2 percent. Consult local power company for correction of
improper voltage and/or phase imbalance.
4. Do not damage internal components when drilling through any panel to mount electrical hardware, conduit, etc.
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