York DM120 Installation Manual download pdf (Page 17)

264973-YIM-A-0806

Unitary Products Group 17

THERMOSTAT WIRING

The thermostat should be located on an inside wall approxi-

mately 56 inch above the floor where it will not be subject to

drafts, sun exposure or heat from electrical fixtures or appli-

ances. Follow the manufacturer's instructions enclosed with

thermostat for general installation procedure. Seven (7) color-

coded, insulated wires should be used to connect the thermo-

stat to the unit. Refer to Table 8 for control wire sizing and

maximum length.

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 C221, 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 1.

The internal wiring harnesses furnished with this unit are an

integral part of the design certified unit. Field alteration to

comply with electrical codes should not be required. If any of

the wire supplied with the unit must be replaced, replacement

wire must be of the type shown on the wiring diagram and the

same minimum gauge as the replaced wire.

A disconnect must be utilized for these units. Factory

installed disconnects are available. If installing a disconnect

(field supplied or York International

supplied accessory),

refer to Figure 4 for the recommended mounting location.

NOTE: Since not all local codes allow the mounting of a dis-

connect on the unit, please confirm compliance with

local code before mounting a disconnect on the unit.

Electrical line must be sized properly to carry the load. USE

COPPER CONDUCTORS ONLY. Each unit must be wired

with a separate branch circuit fed directly from the meter

panel and properly fused.

Refer to Figures 17, 18 and 19 for typical field wiring and to

the appropriate unit wiring diagram mounted inside control

doors for control circuit and power wiring information.

POWER WIRING DETAIL

Units are factory wired for the voltage shown on the unit

nameplate. Refer to Electrical Data Tables 9 to 28 to size

power wiring, fuses, and disconnect switch.

Power wiring is brought into the unit through the side of the

unit or the basepan inside the curb.

TABLE 8: CONTROL WIRE SIZES

Wire Size

Maximum Length

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

18 AWG

150 Feet

Avoid damage to internal components if drilling

holes for disconnect mounting.

When connecting electrical power and control wiring

to the unit, water-proof connectors must be used so

that water or moisture cannot be drawn into the unit

during normal operation. The above water-proofing

conditions will also apply when installing a field sup-

plied disconnect switch.

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York DM120 Installation Manual Page 17

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