SECTION 15784

UNITARY AIR CONDITIONERS

PART 1 GENERAL

SECTION INCLUDES

Unitary air conditioners.

Controls.

PRODUCTS FURNISHED BUT NOT INSTALLED UNDER THIS SECTION

Section 15952 - Controls and Instrumentation: Installation and wiring of thermostats and other control components.

Section 16180 - Equipment Wiring Systems: Installation and wiring of thermostats and other control components.

RELATED SECTIONS

Section 15170 - Motors: Evaporator [and condenser] fan motors.

Section 15742 - Air Cooled Refrigerant Condensers.

Section 15910 - Duct Accessories: Flexible duct connections.

Section 15952 - Controls and Instrumentation.

Section 16180 - Equipment Wiring Systems: Electrical supply to units.

REFERENCES

ANSI/NFPA 90A - Installation of Air Conditioning and Ventilation Systems.

ARI 210 - Unitary Air Conditioning Equipment.

SUBMITTALS

Submit [shop drawings and] product data under provisions of Section [01300.] [01340.]

Submit [shop drawings and] product data for manufactured products and assemblies required for this project.

Indicate water, drain, and electrical rough-in connections on [shop drawings or] product data.

Submit manufacturer's installation instructions under provisions of Section [01300.] [01340.]

OPERATION AND MAINTENANCE DATA

Submit operation and maintenance data under provisions of Section [01700.] [01730.]

Include manufacturer's descriptive literature, operating instructions, installation instructions, maintenance and repair data, and parts listing.

WARRANTY

Provide [five] [_____] year [manufacturer's] warranty under provisions of Section [01700.] [01740.]

Warranty: Include coverage of [refrigeration compressors.] [______________________.]

PART 2 PRODUCTS

MANUFACTURERS

[____________________________________________.]

[____________________________________________.]

[____________________________________________.]

Substitutions: Under provisions of Section [01600.] [01630.]

MANUFACTURED UNITS

Provide packaged, self-contained, factory assembled, prewired unit, consisting of cabinet, compressor, condensing coil, evaporator fan, evaporator coil, [discharge plenum,] [outside air connection,] [heating coil,] air filters, and controls.

Assemble units for [up flow] [horizontal flow] air delivery, in draw-through configuration as indicated.

CABINET

Frame and Panels: Galvanized steel with baked enamel finish, easily removed access doors or panels with quick fasteners.

Insulation: Minimum 1/2 inch (13 mm) thick acoustic duct liner for lining cabinet interior.

Drain Pan: Galvanized steel with corrosion-resistant coating.

EVAPORATOR FAN

Fan: Double width, double inlet, forward curved centrifugal fan, statically and dynamically balanced, with permanently lubricated bearings.

V-Belt Drive: Cast iron or steel sheaves, dynamically balanced, bored to fit shafts and keyed. Variable and adjustable pitch motor sheave selected so required rpm is obtained with sheaves set at mid-position as recommended by manufacturer or minimum 1.5 times nameplate rating of the motor.

Motors: As indicated, in compliance with Section 15170.

COMPRESSOR

Hermetically sealed, 3600 rpm maximum, resiliently mounted with positive lubrication and internal motor protection.

EVAPORATOR COIL

Direct expansion coiling coil of seamless copper [or aluminum] tubes expanded into aluminum fins.

Refrigeration circuit with thermal expansion valve, filter-drier, and charging valves.

CONDENSER

Co-Axial, copper tube in copper tube or shell and tube with [finned] copper tubes in steel shell with water temperature actuated water regulating valve.

****** [OR] ******

Terminating suction and liquid regrigerant piping with service valves within unit; refer to Section 15742.

****** [OR] ******

Fan: Double width, double inlet, forward curved centrifugal fan, statically and dynamically balanced, with permanently lubricated bearings.

V-Belt Drive: Cast iron or steel sheaves, dynamically balanced, bored to fit shafts and keyed. Variable and adjustable pitch motor sheave selected so required rpm is obtained with sheaves set at mid-position as recommended by manufacturer or minimum 1.5 times nameplate rating of the motor.

Motors: As indicated, in compliance with Section 15170.

HEATING COIL

[Hot water] [Steam] heating coil of seamless copper tubes expanded into aluminum fins.

AIR FILTERS

Easily removed [one inch (25 mm) thick permanent cleanable] [2 inch (50 mm) thick disposable glass fiber] panel filters.

CONTROLS

Factory wired controls shall include contactor, high and low pressure cutouts, internal winding thermostat for compressor, control circuit transformer, non-cycling reset relay.

Provide thermostat to cycle cooling, mounted within unit with 'fan-off-cool' switch allowing continuous fan operation, or cycling fan on call for cooling.

Provide room thermostat to control cooling with 'cool-off' selector switch and 'auto-on' fan control switch.

Refer to Section 15952.

PERFORMANCE

Total cooling capacity of [_____] Btu/hr ([_____] W), with [_____] cfm ([_____] L/sec) of air entering evaporator at [_____] degrees F ([_____] degrees C) DB and [_____] degrees F ([_____] degrees C) WB, leaving evaporator at [_____] degrees F ([_____] degrees C) DB and [_____] degrees F ([_____] degrees C) WB, when supplied with water entering condenser at [_____] degrees F ([_____] degrees C), [_____] hp ([_____] W) evaporator fan motor.

Total cooling capacity of [_____] Btu/hr ([_____] W), with [_____] cfm ([_____] L/sec) of air entering evaporator at [_____] degrees F ([_____] degrees C) DB and [_____] degrees F ([_____] degrees C) WB, leaving evaporator at [_____] degrees F ([_____] degrees C) DB and [_____] degrees F ([_____] degrees C) WB, when supplied with refrigerant at [_____] degrees F ([_____] degrees C) saturated suction temperature, [_____] hp ([_____] W) evaporator fan motor.

Total cooling capacity of [_____] Btu/hr ([_____] W), with [_____] cfm ([_____] L/sec) of air entering evaporator at [_____] degrees F ([_____] degrees C) DB and [_____] degrees F ([_____] degrees C) WB, leaving evaporator at [_____] degrees F ([_____] degrees C) DB and [_____] degrees F ([_____] degrees C) WB, and [_____] cfm ([_____] L/sec) of air entering condenser at [_____] degrees F ([_____] degrees C), [_____] hp ([_____] W) evaporator fan motor, [_____] hp ([_____] W) condenser fan motor.

Total heating capacity of [_____] Btu/hr ([_____] W), with [_____] gpm ([_____] L/sec) of water entering at [_____] degrees F ([_____] degrees C) and leaving at [_____] degrees F ([_____] degrees C).

Total heating capacity of [_____] Btu/hr ([_____] W), with [_____] lb/hr ([_____] kg/hr) steam at [_____] psig ([_____] kPa).

PART 3 EXECUTION

INSTALLATION

Install in accordance with manufacturers' installation instructions.

Provide shut-off valves in condenser water inlet and outlet piping.

Pipe drain pan condensate to [____________________.] [nearest floor drain.] [condensate drainage system.]

Supply units fully charged with refrigerant and filled with oil.

SCHEDULE

Drawing_Code	AC-1	AC-2	AC-3

Location

Manufacturer

Model Number

Total Cooling Capacity

Evaporator

Air Flow

Entering Air DB Temperature

Entering Air WB Temperature

Leaving Air DB Temperature

Leaving Air WB Temperature

Fan Motor

Condenser

Water Flow

Water Temperature

Air Flow

Entering Air Temperature

Fan Motor

Heating

Capacity

Water Flow

Entering Water Temperature

Leaving Water Temperature

Steam Capacity

Steam Pressure

END OF SECTION