York R-410A dimensions Service Access, Thermostat, Power And Control Wiring

288429-YIM-A-0307

Service Access

Access to all serviceable components is provided at the following locations:

•Blower compartment access panel

•Electrical/Filter access panel

•Compressor access panel

•Refrigerant connections

Refer to Figures 1 and 3 for location of these access locations and minimum clearances in Table 4.

This system uses R-410A Refrigerant which operates at higher pressures than R-22. No other refrigerant may be used in this system. Gage sets, hoses, refrigerant containers and recovery systems must be designed to handle R-410A. If you are unsure, consult the equipment manufacturer. Failure to use R-410A compatible servicing equipment may result in property damage or injury.

Wear safety glasses and gloves when handling refrigerants. Failure to follow this warning can cause serious personal injury.

Refer to Figure 11 for the R-410A quick reference guide.

Thermostat

The room thermostat should be located on an inside wall approximately 56" above the floor where it will not be subject to drafts, sun exposure or heat from electrical fixtures or appliances. Follow manufacturer's instructions enclosed with the thermostat for general installation procedure. Six color coded insulated wires (minimum #18 AWG) should be used to connect thermostat to unit. See Figures 7 and 8.

Power And Control Wiring

Field wiring to the unit must conform to provisions of the current N.E.C. ANSI/NFPA No. 70 or C.E.C. and/or local ordinances. The unit must be electrically grounded in accordance with local codes or, in their absence, with the N.E.C./C.E.C. Voltage tolerances which must be maintained at the compressor terminals during starting and running conditions are indicated on the unit Rating Plate and Table 5.

The wiring entering the cabinet must be provided with mechanical strain relief.

A fused disconnect switch should be field provided for the unit. If any of the wire supplied with the unit must be replaced, replacement wire must be of the type shown on the wiring diagram.

Electrical line must be sized properly to carry the load. Each unit must be wired with a separate branch circuit fed directly from the meter panel and properly fused.

Refer to Figures 7, 8 and 9 for typical field wiring and to the appropriate unit wiring diagram for control circuit and power wiring information.

**= Minimum wire size of 18 AWG wire should be used for all field installed 24 volt wire.

SINGLE STAGE THERMOSTAT

R

G

NOTE: HEAT ANTICIPATOR

SHOULD BE SET AT 0.35

UNIT CONTROL BOARD AMPS FOR ALL MODELS. TERMINAL STRIP

**R

JUMPER NEEDED FOR FULL SPEED

GCOMPRESSOR OPERATION

YY1

Y/Y2

WW2

W1

24 VOLT

TRANSFORMER

CC

PROGRAMMABLE

THERMOSTAT ONLY

Figure 7: Typical Field Control Wiring Diagram Single Stage Thermostat

8 Unitary Products Group