Compressors, Filters, Thermostat Wiring

66307-YIM-B-0606

FIGURE 14 - RETURN DOWNFLOW PLENUM WITH PANEL

FIGURE 15 - DISCHARGE PANEL IN PLACE

CONDENSATE DRAIN

The side condensate drain is reversible and maybe re-ori- ented to the rear of the cabinet to facilitate condensate pip- ing. A condensate drain connection is available through the base pan for piping inside the roof curb. Trap the connection per Figure 16. The trap and drain lines should be protected from freezing.

Plumbing must conform to local codes. Use a sealing com- pound on male pipe threads. Install condensate drain line from the 3/4 inch NPT female connection on the unit to an open drain.

COMPRESSORS

The compressors are mounted on elastomer insulators. The mounting bolts have been fully tightened for shipping.

Do not loosen the compressor mounting bolts.

FILTERS

Two-inch filters are supplied with each unit. One-inch filters may be used with no modification to the filter racks. Filters must always be installed ahead of evaporator coil and must be kept clean or replaced with same size and type. Dirty fil- ters reduce the capacity of the unit and result in frosted coils or safety shutdown. All units use four (4) 20”x25”x2” filters. The unit should not be operated without filters properly installed.

Make sure that panel latches are properly positioned on the unit to maintain an airtight seal.

THERMOSTAT WIRING

The thermostat should be located on an inside wall approxi- mately 56 inches above the floor where it will not be subject to drafts, sun exposure or heat from electrical fixtures or appliances. Follow the manufacturer's instructions enclosed with thermostat for general installation procedure. Seven (7) color-coded, insulated wires should be used to connect the thermostat to the unit. Refer to Table 7 for control wire sizing and maximum length.

TABLE 7: CONTROL WIRE SIZES

Wire Size	Maximum Length*
18 AWG	150 Feet (45.72 meters)

*. From the unit to the thermostat and back to the unit.

3"Minimum (76.2mm)

FIGURE 16 - CONDENSATE DRAIN

POWER AND CONTROL WIRING

Field wiring to the unit, fuses, and disconnects must conform to provisions of National Electrical Code (NEC), ANSI/NFPA No. 70 – Latest Edition (in U.S.A.), current Canadian Electri- cal Code CSA C22.1, and/or local ordinances. The unit must be electrically grounded in accordance with NEC and CEC as specified above and/or local codes.

Voltage tolerances which must be maintained at the com- pressor terminals during starting and running conditions are indicated on the unit Rating Plate and Table 2.

The internal wiring harnesses furnished with this unit are an integral part of the design certified unit. Field alteration to

Unitary Products Group