York YK145.00-EG4 Specifications, General, Cabinet, Refrigeration Circuits, Indoor Fan, Filters

Technical Guide: YK145.00-EG4 (309) Water Source Heat Pumps

SPECIFICATIONS

GENERAL

All R-series models ½ - 6 ton ship as factory-charged packages, complete with R-410A refrigerant. Horizontal (RSH) units are designed for suspended ceiling mount- ing. RSH models are shipped with ‘straight-through’ evaporator fan discharge as standard. Fan orientation is field convertible to side discharge.

Vertical (RSV) units are designed for free-standing floor mounting. All units are completely factory wired and pre-piped. Water supply, water outlet, and condensate drain connections are via flush-mounted female pipe thread fittings (no back-up wrench required).

CABINET

All cabinets are completely constructed of corrosion resistant galvanized steel. The RSH units are complete with integral hanger channels. The entire unit interior (both evaporator and condensing section) is insulated with 1/2″ thick, 2 lb density acoustical insulation. Service panels are equipped with lifting handles for ease of removal and handling. All units provide service access to the reversing valve, thermal expansion valve, and compressor with the unit remaining in location. An inte- gral duct collar is provided on the blower discharge opening.

REFRIGERATION CIRCUITS

All models utilize high efficiency rotary, hermetic recip- rocating or scroll compressors. Compressors are mounted with rubber isolators on acoustically tuned bases to minimize vibration transmission. Internal over- load protection is provided. External high pressure and low pressure cutout switches are included in each compressor control circuit. Each refrigeration circuit includes an adjustable bi-flow thermal expansion valve (with external equalizer), bi-flow liquid line filter drier, and service gauge ports. The reversing valve is a pilot operated, sliding piston type with a replaceable mag- netic solenoid coil.

The refrigerant-to-air heat transfer coils are constructed of internally enhanced copper tubes mechanically bonded to enhanced aluminum plate fins. The evapora- tor coil is employed in a draw-through configuration. Large evaporator coil face area minimizes potential water blow-off. A fully-insulated, corrosion resistant condensate drain pan is provided.

•Optional anti-corrosion protective evaporator coil coating.

• Optional stainless steel drain pan.

The coaxial refrigerant-to-water heat exchangers fea- ture a convoluted inner tube design for high heat transfer efficiency. Standard models feature a copper inner tube surrounded by a steel outer tube, and carry a 400 psig water side working pressure rating. Units shall be capable of operation with an entering fluid temperature range of 20°F to 110°F.

•Optional cupro-nickel condenser water coil.

•Optional condenser insulation package for low- water temperature, geothermal applications.

INDOOR FAN

Forward curved, double inlet and double width, direct- drive centrifugal blowers are used for air movement. Large diameter wheels are employed to provide required airflow performance at minimum noise levels. Blower wheels are fabricated of galvanized steel. Fan motors are PSC type, with minimum three speeds. The PSC motors feature permanently lubricated bearings and internal thermal overload protection.

ELECTRICAL/CONTROLS

All units are completely factory wired with all necessary operating controls. A 24 volt control circuit, with over- sized transformer, is provided for field connection. Units are designed to operate with conventional heat pump thermostat control interface. The reversing valve sole- noid coil shall be energized in cooling mode only. A manual reset is provided on each compressor control circuit in the event of high/low pressure cutout.

•Optional solid-state electronic condensate overflow switch.

•Optional remote management package allows the unit to be controlled by an external source.

FILTERS

All models are shipped with 1-inch thick throwaway filters, factory installed. Filters are accessible from either side of unit.

FIELD INSTALLED ACCESSORIES

The following options are available field installation:

•24″ braided stainless steel hose kit with fittings. (qty 2 hoses per kit)

•Manual isolation ball-valves (600 psi full port).

•Thermostat (programmable or non-programmable)

4 Johnson Controls