238113_Packaged Terminal Air Conditioners.DOC

SECTION 238113 - PACKAGED WALL-MOUNT HEAT PUMPS

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section includes packaged wall-mount heat pump and their accessories and controls, in the following configurations:

1. Packaged wall-mount heat pump with electric heat.

1.3 SUBMITTALS

A. Product Data: For product indicated. Include rated capacities, operating characteristics, furnished specialties, electrical characteristics, and accessories.

B. Shop Drawings: For packaged wall-mount heat pump. Include plans, elevations, sections, details for wall penetrations, and attachments to other work.

1. Detail equipment assemblies and indicate dimensions, weights, loads, required clearances, method of field assembly, components, and location and size of each field connection.

2. Wiring Diagrams: For power, signal, and control wiring.

C. Color Samples: For unit cabinet and for each color and texture specified.

D. Product Test Reports: Based on evaluation of comprehensive tests performed by manufacturer and witnessed by a qualified testing agency, for packaged wall-mount heat pump.

E. Field quality-control reports.

F. Operation and Maintenance Data: For packaged wall-mount heat pump to include in emergency, operation, and maintenance manuals.

G. Warranty: Sample of special warranty.

1.4 QUALITY ASSURANCE

A. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, by a qualified testing agency, and marked for intended location and application.

B. ASHRAE Compliance: Applicable requirements in ASHRAE 62.1-2004, Section 4 - "Outdoor Air Quality," Section 5 - "Systems and Equipment," Section 6 - "Ventilation Rate Procedures," and Section 7 - "Construction and Startup."

C. ASHRAE/IESNA Compliance: Applicable requirements in ASHRAE/IESNA 90.1-2007

D. ANSI/ARI Standard 390-2003 for SPVU (Single Package Vertical Units).

1.5 COORDINATION

A. Coordinate layout and installation of packaged wall-mount heat pump and wall construction with other construction that penetrates walls or is supported by them.

1.6 WARRANTY

A. Special Warranty: Manufacturer's standard form in which manufacturer agrees to repair or replace components of packaged wall-mount heat pump that fail in materials or workmanship within specified warranty period.

1. Warranty Period for Sealed Refrigeration System: Manufacturer's standard, but not less than five years from date of Substantial Completion, including components and labor.

2. Warranty Period for Nonsealed System Parts: Manufacturer's standard, but not less than five years from date of Substantial Completion, including only components and excluding labor.

3. Warranty Period for Heat Exchangers: Manufacturer's standard, but not less than five years from date of Substantial Completion.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to, the following:

1. Bard Manufacturing Company.

2.2 MANUFACTURED UNITS

A. Description: A one-piece wall mounted, factory-assembled, precharged, prewired, tested ready-to-operate heat pump unit. The unit shall be approved and listed by Underwriters Laboratories, Inc. for installation on combustible surfaces for zero clearance between the unit and wall. For the first three feet the supply duct shall be approved for ¼ inch clearance to combustible material. Unit performance shall be certified in accordance with Air Conditioning and Refrigeration Institute Standard 390-2003 for Single Package Vertical Units.

2.3 CHASSIS

A. Cabinet: Shall be a single, enclosed, weatherproof casing constructed of 20 gauge galvanized steel. Each exterior casing panel to be bonderized and finished with baked-on exterior polyester enamel paint prior to assembly. The baked-on, exterior polyester enamel finish shall be applied over a polyurethane primer coating and capable of resisting a minimum 1000 hour salt spray exposure per ASTM B117-03 and/or shall comply with the UL's Test Number ASTM D1654 for protection against carbon dioxide and sulfur dioxide. The baked-on cured paint finish shall pass the industry rub test with a minimum of 72 rubs MEK (Methyl Ethyl Ketone) or standard rub test of a minimum of 100 rubs using Toluene. Cooling section shall be fully insulated with 1-inch fiberglass to prevent sweating and to muffle sounds. Openings shall be provided for power connections. Access openings appropriate for outside structure to all fan motors and compressor for making repairs and for removing internal components without removing unit from its permanent installation. Fresh air intake and outdoor coil shall be protected from intrusions by a sturdy metal grating with less than ¼ inch openings.

B. Compressor:

Shall be a welded hermetic type with internal vibration isolations, built-in thermal and over current protective devices. Compressor shall have a limited 5-year warranty, suction and discharge gauge ports, crankcase heater on reciprocating compressor.

C. Coils: Shall be of copper tube construction with mechanically bonded aluminum plate fins. The refrigerant control shall be factory installed capillary tube type.

D. Blowers and Fans: Twin indoor coil blowers shall have a centrifugal forward curved blower direct driven by motor. Indoor blowers shall discharge horizontally. Propeller type outdoor coil fan shall discharge horizontally and be direct driven by motor.

E. Condenser Fan, Motor And Shroud: Condenser fan, motor and shroud shall be of “slide out” configuration for easy service and maintenance.

F. Controls: Shall be factory-wired and located in a readily accessible location being on the right side of unit. Fan motors shall have both thermal and current sensitive overload devices. Control circuit transformer (24V) shall be factory installed. The unit shall be factory wired with auto reset high pressure switch with lockout circuit, resettable from wall thermostat, 5 minute compressor time delay, time-temperature defrost system with 10-minute time-safe override, 30, 60 or 90-minute defrost cycle, and emergency heat relay. Line voltage circuit breaker or toggle disconnect with lockable cover shall be supplied on each unit and shall be easily accessible without removing any unit panels.

G. Mounting Brackets: Full length side mounting brackets shall be an integral part of the cabinet. A 16 gauge metal bracket shall be provided for bottom.

H. Rain Protection: Top panel of unit should be sloped away from building to provide “rain hood” protection. Shall include top rain flashing to minimize water leaks.

2.4 ACCESSORIES

A. Unit shall include the following accessories:

1. A programmable temperature and humidity controller with the following features:

a. No batteries, when in programmable configuration retains date/time settings for 24-hours during power loss

b. Auto or manual changeover option

c. Heat/Cool or Heat Pump

d. Fan Operation: Auto/On/Programmed

e. Humidity control, built-in dehumidistat, Range 45-95%

f. Display of space humidity

g. Outdoor sensor option (used to limit electric heat operation for heat pump above selected outdoor temperature

h. Remote indoor sensor option (for ACU-2) (used to average remote indoor sensor and on-board sensor)

i. indoor coil with capillary restrictor; and hermetically sealed scroll compressor with vibration isolation and overload protection.

2. Low pressure control with timed bypass circuit and lockout relay

3. Low ambient control and relay

4. Outdoor thermostat

5. Electric heat package

6. Two-inch pleated filter (25-50% efficiency, MERV rating of 7)

7. Built-in fully modulating economizer with enthalpy control, with built-in exhaust damper

8. Dehumidification circuit (hot gas reheat)

a. The dehumidification circuit shall incorporate an independent heat exchanger coil in the supply air stream in addition to the standard evaporator coil. This coil reheats the supply air after passing over the cooling coil, and shall be sized to nominally match the sensible cooling capacity of the evaporator coil.

b. The dehumidification refrigerant reheat circuit shall be controlled by a 3-way valve directing the refrigerant gas to the normal condenser during periods when standard air conditioning is required. During periods of time of low ambient temperature (approximately 65° to 75° outdoor) and high indoor humidity, a humidistat senses the need for mechanical dehumidification. It then energizes both the compressor circuit and the 3-way valve, thus directing the hot refrigerant discharge gas into a separate desuperheating condenser circuit which reheats the conditioned air before it is delivered to the room. The refrigerant gas is then routed from the desuperheating condenser to the system condenser for further heat transfer. A check valve is located in the reheat coil return line. When the humidistat is satisfied, the system automatically switches back to normal A/C mode and either continues to operate or turns off based on the signal from the wall thermostat.

c. Dehumidification shall be controlled through a humidistat and is independent of the thermostat. On a call for dehumidification mode of operation, the compressor and 3-way valve that feeds the reheat coil are energized. Dehumidification will continue until the humidistat is satisfied. If the room temperature falls below 1st stage heating setpoint, electric heat will be energized by the room thermostat and cycle to maintain room temperature. If 2nd stage heating setpoint is reached, dehumidification cycle is de-energized and heat pump heating is energized. If the mixed air (return and ventilation) temperature (measured at the internal filter location) drops below 65°F during dehumidification cycle, electric heat will cycle to help maintain room temperature to the 65°F condition. Anytime there is a call for cooling, dehumidification is canceled and the unit will operate in the cooling mode until satisfied. If dehumidification call is still present when cooling call is satisfied, the unit will continue to operate and revert to dehumidification mode.

2.5 CAPACITIES AND CHARACTERISTICS

A. Capacity as indicated on Equipment Schedules included on drawings.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Install units level and plumb, maintaining manufacturer's recommended clearances and tolerances.

B. Install units in accordance with manufacturer’s written instructions and recommendations.

3.2 FIELD QUALITY CONTROL

A. Manufacturer's Field Service: Engage a factory-authorized service representative to inspect, test, and adjust components, assemblies, and equipment installations, including connections.

B. Perform tests and inspections.

1. Manufacturer's Field Service: Engage a factory-authorized service representative to inspect components, assemblies, and equipment installations, including connections, and to assist in testing.

C. Tests and Inspections:

1. Inspect for and remove shipping bolts, blocks, and tie-down straps.

2. After installing packaged wall-mount heat pump and after electrical circuitry has been energized, test for compliance with requirements.

3. Operational Test: After electrical circuitry has been energized, start units to confirm proper motor rotation and unit operation.

4. Test and adjust controls and safeties. Replace damaged and malfunctioning controls and equipment.

D. Packaged wall-mount heat pump will be considered defective if they do not pass tests and inspections.

E. Prepare test and inspection reports.

3.3 STARTUP SERVICE

A. Engage a factory-authorized service representative to perform startup service.

B. After installation, verify the following:

1. Unit is level and is flashed in exterior wall.

2. Unit casing has no visible damage.

3. Compressor, air-cooled condenser coil, and fans have no visible damage.

4. Labels are clearly visible.

5. Controls are connected and operable.

6. Shipping bolts, blocks, and tie-down straps are removed.

7. Filters are installed and clean.

8. Drain pan and drain line are installed correctly.

9. Electrical wiring installation complies with manufacturer's submittal and installation requirements in Division 26 Sections.

10. Installation. Perform startup checks according to manufacturer's written instructions, including the following:

a. Lubricate bearings on fan.

b. Check fan-wheel rotation for correct direction without vibration and binding.

C. After startup service and performance test, change filters.

3.4 ADJUSTING

A. Adjust initial temperature set points.

B. Set field-adjustable switches and circuit-breaker trip ranges as indicated.

3.5 DEMONSTRATION

A. Engage a factory-authorized service representative to train Owner's maintenance personnel to adjust, operate, and maintain packaged wall-mount heat pump.

END OF SECTION

Upgrade The Annex Building HVAC Packaged Wall-Mount Heat Pumps BIIRU, Newark DE 238113 -