238126 - duct-free split system air conditioners.doc

SECTION 23 81 26

DUCT-FREE SPLIT SYSTEM AIR CONDITIONER

PART 1 - GENERAL

1.01 RELATED DOCUMENTS:

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

1.02 SECTION INCLUDES:

A. Outdoor air-cooled condensing unit

B.

Indoor ceiling-suspended fan coil unit

1.03

RELATED SECTIONS:

A.

Section 23 01 00 - General HVAC Requirements

B.

Section 23 21 13 - HVAC Hydronic Piping

C.

Section 23 23 00 - Refrigerant Piping

1.04

SUBMITTALS:

A.

Shop drawings and product data in accordance with Section 23 01 00.

B.

Wiring diagrams and certification that units have been factory tested.

C.

Field reports indicating condition and operation at start-up.

D.

Reports indicating specified performance has been met or exceeded.

E.

Manufacturer's start-up instructions, maintenance data, parts lists, and trouble-shooting guide to be included in Maintenance Manuals.

1.05

QUALITY ASSURANCE:

A.

Unit shall be rated in accordance with ARI Standard 210/240, latest edition.

B.

Unit construction shall comply with ANSI/ASHRAE 15-1978 safety code and comply with NEC (National Electrical Code).

C.

Unit shall be constructed in accordance with UL Standards and shall carry the UL label of approval. Unit shall have CSA approval.

D.

Air-cooled condenser coils shall be leak tested at 150 psig and pressure tested at 480 psig.

1.06

DELIVERY, STORAGE, AND HANDLING:

A.

Unit shall be stored and handled per unit manufacturer's recommendations.

1.07

WARRANTY:

A.

In addition to the one (1) year manufacturer's warranty, provide an additional four (4) year warranty on all compressors (5 years total).

PART 2 - PRODUCTS

2.01

ACCEPTABLE MANUFACTURERS:

A. Carrier

B. Trane

C. York

2.02

GENERAL:

A.

Factory assembled, single-piece, air-cooled heat pump unit and indoor direct expansion ceiling suspended fan coil. Contained within the unit cabinet shall be all factory wiring, piping, controls, refrigerant charge (R-410A) and special features required prior to field start-up. Outdoor heat pump and indoor fan coil must be by the same manufacturer. System to be minimum 13 SEER and 7.7 HSPF.

B.

G90 galvanized steel casing, zinc phosphatized, with a baked enamel finish.

C.

Size, capacity, arrangement, HP and voltage as shown on drawings.

2.03

CONDENSER:

A.

Fans shall be direct drive propeller type with vertical upward discharge and including the following:

1.

Permanently lubricated bearings

2.

Safety guards

3.

Corrosion resistance shafts

4.

Statically and dynamically balanced

B.

Coil be air-cooled with integral subcooler constructed of aluminum fins mechanically bonded to seamless copper tubes with are then cleaned, dehydrated and sealed.

2.04

COMPRESSORS:

A.

Fully hermetic reciprocating or scroll type.

B.

Each equipped with oil system, operating oil charge, discharge shutoff valves, and an insert type factory sized crankcase heater to control oil dilution.

C.

Each mounted on spring vibration isolators with an isolation efficiency of no less than 95%.

2.05

REFRIGERATION COMPONENTS:

A.

Refrigeration circuit components shall include bi-flow filter drier, accumulator reversing valve, heating mode metering device, high side pressure relief device, liquid line shut-off valve, suction and discharge shut-off valves, holding charge of refrigerant R-410A and compressor oil.

2.06

FAN COIL UNIT CABINET:

A.

Unit panels shall be constructed of minimum 18-gage mill galvanized steel. Casing panels shall be removable for easy access to the unit. Color to be selected.

B.

Inlet grille shall be high-impact polystrene.

C.

Provide wall mounting brackets.

2.07

FANS:

A.

Fans shall be centrifugal blower type with air intake in bottom of unit and discharge in the front with automatic motor-driven air sweep.

B.

Fan motor shall be three (3) speed with integral overload protection and permanent lubrication.

2.08

COILS:

A.

Bottom insulated drain pan shall be sloped in all directions toward drain fitting.

B.

All coils shall be tested at 450 psig air pressure while submerged in water. All coils shall have mill galvanized steel casings.

C.

Coils shall be aluminum plate fins bonded to copper tubes by mechanical expansion.

D.

An auxiliary electric UL listed heating coil, including all operating and safety controls, shall be provided.

2.09 CONDENSATE PUMP:

A.

Provide internal condensate drain pump.

2.10

FILTERS:

A.

Filters shall be permanent cleanable type.

2.11

OUTDOOR UNIT OPERATING AND SAFETY CONTROLS:

A.

Minimum control functions shall include:

1.

Power and control terminal blocks.

2.

Five-minute recycle protection to prevent compressor short cycling.

3.

Lock-out on auto-reset safety until reset from thermostat.

4.

Capacity control on the compressor shall be by suction cutoff unloaders in response to compressor suction pressure.

5.

Single pump-out control at the end of every cycle to evacuate the low side of the refrigeration system when the compressor cycles off.

6.

Low ambient head pressure control to -20 degrees F by fan cycling. One condenser fan shall be cycled by discharge pressure to maintain proper head pressure.

7.

Anti short-cycling device.

B.

Minimum automatic reset safety devices shall include:

1.

High discharge pressure cutout

2.

High discharge temperature cutout

3.

Low suction pressure cutout

C.

Condenser fan motors to be protected against overload or single phase condition by internal overloads.

D.

Minimum manual reset safety devices shall include:

1.

Low oil pressure cutout

2.

Electrical overload protection circuit breakers (Circuit breakers shall open all three phases in the event of an overload in any one of the phases or a single phase condition.)

2.12

FAN COIL OPERATING CONTROLS

A.

Fan coil controls shall consist of a solid-state electromechanical control system which shall control space temperature and determine optimum fan speed. The temperature control range shall be from 67 degrees F. to 84 degrees F. The unit shall have the following functions as a minimum:

1.

An automatic restart after power failure at the same operating conditions as at failure.

2.

Non-programmable thermostat to provide cooling and heating set points.

3.

Evaporator coil freeze protection.

4.

Wire control to enter set points and operating conditions.

5.

Filter status indication after 250 hours of indoor fan operation.

6.

Automatic air sweep control to provide on or off activation of airsweep louvers.

7.

Cooling mode to provide modulating fan speed.

8.

Fan only operation to provide room air circulation when no cooling is required.

9.

A 50-foot indoor to outdoor control connection cable shall be provided with the fan coil unit.

10.

Fan speed control shall be user-selectable: high, medium, low, or automatic operation during all operating modes.

11. A time delay shall prevent compressor restart in less than two (2) or four (4) minutes (adjustable).

12.

Automatic heating-to-cooling changeover to provide automatic heating and cooling operation. Control shall include deadband to prevent rapid mode cycling.

2.13

ELECTRICAL REQUIREMENTS:

A.

Unit shall operate on the voltage shown on drawings.

B.

Unit electrical power shall be single point connection.

C.

Unit control circuit shall contain a 24 volt transformer for unit control, with capacity to operate an indoor fan interlock.

PART 3 - EXECUTION

3.01

INSTALLATION:

A.

Condenser shall be installed in strict accordance with the manufacturer's printed instructions.

B.

Level condensing unit.

C.

Provide refrigerant piping to cooling coil including specialties as shown on drawings.

D.

Test, dehydrate, and charge the refrigeration system in strict accordance with the manufacturer's instructions.

3.02

MANUFACTURER'S FIELD SERVICES:

A.

Supply the services of a factory trained representative to supervise testing, dehydration and charging of machine, start-up, and instructions on operation and maintenance to Owner. Minimum of one day.

END OF SECTION 23 81 26

23 81 26-6

DUCT-FREE SPLIT SYSTEM AIR CONDITIONER

12910-330

Revised 3/2/09

12910-330

DUCT-FREE SPLIT SYSTEM AIR CONDITIONER

23 81 26-5

Revised 3/2/09