•Phase Monitors - Designed to prevent unit damage. The phase monitor will shut the unit down in an out-of phase condition.
Guide Specifications
General
Units shall be manufactured by Johnson Controls Unitary Products in an ISO 9001 certified facility.
York's ZJ/ZR/ZF units are convertible single package units. ZJ models have four independent refrigerant circuits and ZR/ZF models have dual independent refrigerant circuits for efficient part load operation and maximum comfort control. Although the units are primarily designed for curb mounting on a roof, they can also be slab-mounted at ground level or set on steel beams above a finished roof. Cooling only, cooling with gas heat and cooling with electric heat models are available with a wide variety of factory-mounted options and field-installed accessories to make them suitable for almost every application. All units are self-contained and assembled on full perimeter base rails with holes in the four corners for overhead rigging. Every unit is completely piped, wired, charged and tested at the factory to simplify the field installation and to provide years of dependable operation. All models (including those with an economizer) are suitable for either bottom or horizontal duct connections. Models with power exhaust are suitable for bottom duct connections only. For bottom duct, remove the sheet metal panels from the supply and return air openings through the base of the unit. For horizontal duct, replace the supply and return air panels on the rear of the unit with a side duct flange accessory. All supply air blowers are equipped with a belt drive that can be adjusted to meet the exact requirements of the job. A high static drive option is available for applications with a higher CFM and/or static pressure requirement.
ZJ/ZR models have 4 condenser fan motors and ZF models have 2 condenser fan motors. All compressors include crankcase heat and internal pressure relief. Every refrigerant circuit includes an expansion valve, a liquid line filter-drier, a discharge line high pressure switch and a suction line with a freezestat and low pressure/loss of charge switch. The unit control circuit includes a 75 VA transformer, a 24-volt circuit breaker and a relay board with two compressor lockout circuits, a terminal strip for thermostat wiring, plus an additional set of pin connectors to simplify the interface of additional field controls. All units have long lasting powder paint cabinets with 1000 hour salt spray test approval under ASTM-B117 procedures. All models are CSA approved. All models include a 1-year limited warranty on the complete unit. Compressors and electric heater elements carry an additional 4-year warranty. Aluminized steel tubular heat exchangers carry an additional 9- year warranty.
Description
ZJ units shall be factory-assembled, single packaged, ZJ***N Electric Cooling/Gas Heat, ZJ***C/E Electric Cooling/Optional Electric Heat, designed for outdoor mounted installation. The 15 ton unit shall have a minimum EER rating of 12.4. The 17.5 ton
unit shall have a minimum EER rating of 12.1. The 20 ton unit shall have a minimum EER rating of 11.6. The 25 ton unit shall have a minimum EER rating of 10.4.
ZR units shall be factory-assembled, single packaged, ZR***N Electric Cooling/Gas Heat, ZR***C/E Electric Cooling/Optional Electric Heat, designed for outdoor mounted installation. The 15 ton unit shall have a minimum EER rating of 11.6. The 20 ton unit shall have a minimum EER rating of 12.1. The 25 ton unit shall have a minimum EER rating of 10.5.
ZF units shall be factory-assembled, single packaged, ZF***N Electric Cooling/Gas Heat, ZF***C/E Electric Cooling/Optional Electric Heat, designed for outdoor mounted installation. The 15 and 17.5 ton units shall have a minimum EER rating of 11.0.
The 20 and 25 ton units shall have a minimum EER rating of 10.
They shall have built-in field convertible duct connections for down discharge supply/return or horizontal discharge supply/ return, and be available with factory installed options or field installed accessories. The units shall be factory wired, piped, charged with R-410A refrigerant and factory tested prior to shipment. All unit wiring shall be both numbered and color coded. All units shall be manufactured in a facility certified to ISO 9001 standards and the cooling performance shall be rated in accordance with DOE and ARI test procedures. Units shall be CSA listed, classified to ANSIZ21.47 standards, UL 1995/ CAN/CSA No. 236-M90 conditions.
Unit Cabinet
Unit cabinet shall be constructed of galvanized steel, with exterior surfaces coated with a non-chalking, powdered paint finish, certified at 1000 hours salt spray test per ASTM-B117 standards. Indoor blower section shall be insulated with a minimum 1/2" thick insulation, coated on the airside. Aluminum foil faced insulation shall be used in the furnace compartment and be fastened with ridged fasteners to prevent insulation from entering the air stream. Cabinet panels shall be "large" size, easily removable for servicing and maintenance. Full perimeter base rails shall be provided to assure reliable transit of equipment, overhead rigging and proper sealing on roof curb applications. Disposable 2" filters shall be furnished and be accessible through a removable access door, sealed airtight. Units filter track shall be designed to accommodate either 1" or 2" filters. Fan performance measuring ports shall be provided on the outside of the cabinet to allow accurate air measurements of evaporator fan performance without removing panels or creating air by-pass of the coils. Condensate pan shall be internally sloped and conform to ASHRAE 62-89 self- draining standards. Condensate connection shall be a minimum of 1" I.D. female and be a ridged mount connection. Unit shall incorporate a fixed outdoor air damper with an outdoor air intake opening covered with a bird screen and a rain hood painted to match the exterior of the unit.
Indoor (Evaporator) Fan Assembly
Fan shall be a belt drive assembly and include an adjustable- pitch motor pulley. Job site selected (B.H.P.) brake horsepower shall not exceed the motors nameplate horsepower rating, plus
