Mechanical Specifications, General Description

MECHANICAL SPECIFICATIONS

GENERAL DESCRIPTION

Single packaged outdoor mounted rooftop with built in field convertible duct connections for vertical discharge/return air or horizontal discharge/return air configuration. Cooling per- formance shall be rated in accordance with DOE and ARI test procedures. Units shall be CSA Certified to ANSIZ21.47 stan- dards and UL 1995/CAN/CSA No. 236-M90 conditions.

EQUIPMENT

Factory-assembled, single-piece heating and cooling unit. Unit shall be factory wired, piped, charged with R-22 refriger- ant and factory tested prior to shipment. Enclosed in each unit shall be a factory test log sheet consisting of the unit tested pressures, temperatures and amps, as tested prior to shipment.

Unit Cabinet:

1.Unit cabinet shall be constructed of galvanized steel, with exterior surfaces coated with a powered paint finish certified at 750 hours salt spray test per ASTM-B117 standards.

2.Indoor blower section shall be insulated with a minimum thick insulation, coated on the air side. Aluminum foil faced insulation shall be used in the furnace compart- ment and be fastened with ridged fasteners to prevent entering the air stream.

3.Cabinet panels shall be large size and easily removable for servicing.

4.Perimeter base rails shall be provided to assure reliable transit of equipment, rigging, and proper sealing to roof on curb applications.

5.Disposable filters (1") shall be furnished and be accessi- ble through a removable access door sealed air tight. Units filter track shall be designed to accommodate both 1" and 2" filters.

6.Fan performance access ports shall be provided on cab- inet to allow accurate air measurements of evaporator fan performance without removing panels or creating air by-pass of the coils.

7.Units vertical discharge duct configuration shall be designed to fit between standard 24" O.C. beams without modification to building structure, duct work and base unit.

8.Condensate pan shall be internally sloped and confirm to ASHARE 62-89 Standards. Condensate connection shall be a minimum of and be a rigged mount connection secured to the base unit.

036-21216-003-A-0204

Indoor (evaporator) fan assembly:

1.Fan shall be a belt driven assembly and include an adjustable-pitch motor pulley. Job site selected (B.H.P.) brake horse power shall not exceed the motors name- plate horse power rating plus the service factor. Units are designed not to operate into service factor.

2.Fan wheel shall be double-inlet type with forward-curved blades which are dynamically balanced.

3.Bearings shall be sealed, permanently lubricated for longer life and no maintenance.

Outdoor (condenser) fan assembly:

1.Outdoor (condenser) fan shall be of the direct-driven pro- peller type and shall discharge air vertically upward.

2.Outdoor (condenser) fan motor shall be totally enclosed with permanently lubricated bearings and internally pro- tected to overload conditions.

3.Outdoor (condenser) fan shall have aluminum blades riv- eted to corrosion resistant steel spiders and shall be dynamically balanced.

Refrigerant components:

1.Compressor:

a.Fully hermetic type, internally protected with internal high-pressure relief and over temperature protec- tion.

b.Factory mounted on internal spring mounted on independent dedicated mounting isolation.

2.Coils:

a.Evaporator and condenser coils shall have alumi- num plate fins mechanically bonded to seamless internally-enhanced copper tubes with all joints brazed. Special Phenolic coating available as a fac- tory option.

b.Evaporator coil shall be of the full face active design.

3.Refrigerant Safety Components: Refrigerant circuit components shall include:

a.Balance-port thermostatic expansion valve with independent circuit feed system.

b.Filter drier/ strainer to eliminate any moisture or for- eign matter.

c.Service gage connections on suction, discharge lines to charge, evacuate, and contain refrigerant during necessary servicing.

4.Unit Controls:

a.Unit shall be complete with self contained low-volt- age control circuit protected by a fuse on the 24 volt transformer side.

24	Unitary Products Group