COMPAC® II WALL MOUNT AIR CONDITIONERS WITH 48VDC EVAPORATOR AIR MOVER

MODELS ASDCA, ASDCHA & HSDCA

GENERAL DESCRIPTION

The Marvair® ComPac® II ASDCA and ASDCHA DC Free Air HVAC (MatPac series) units are designed to cool telecommunications shelters where the high internal heat load requires year round cooling-even when ambient temperatures are below 60°F (15°C). To provide cooling during a wide range of ambient conditions, the ASDCA air conditioners have the necessary controls and components for year round cooling. The units use the non-ozone depleting R-410A refrigerant.

DC POWER PROVIDES EMERGENCY COOLING/VENTILATION

Should there be loss of power to the site, the Marvair DC Free Air unit will continue to cool/ventilate the site by utilizing the shelter’s DC power to introduce outside air into the shelter for free cooling. The DC Free Air unit will continue to ventilate the site and extend the run time of the equipment until battery power is exhausted or, at the minimum, owner specified pull down of battery drain.

The ASDCA models operate on both AC and DC power. The compressor, condenser fan motor and electric heat operate on AC power, but the evaporator motors, the 100% free cooling economizer damper and the internal control board operate on DC power – an inverter is not required. Since these key components are all powered by 48 VDC – the same 48 VDC power used by the shelter’s radios- they are always operational.

The 48 VDC power supply connects to an internal DC breaker. From this breaker, power is supplied to the DC indoor blower and control board.

FREE COOLING WITH THE MARVAIR 100% FULL FLOW ECONOMIZER

When the outside air is cool and dry, the economizer damper opens and draws in filtered, outside air to cool the shelter. The Marvair 100% full flow economizer means the same CFM of outside air is brought into the shelter as the rated air flow of the unit. The innovative design of the full flow economizer assembly also allows outside air to exit the building – pressure relief- when the full flow economizer is operating. This design eliminates the need for additional, costly penetrations in the shelter.

Free cooling provides temperature control, energy savings, and increased reliability by decreasing the operating hours of the compressor and the condenser fan. To insure proper operation and optimum performance, all economizers are non-removable, factory installed and tested.

ASDCA STANDARD EFFICIENCY MODELS:

• EER: 9.0 - 10.0

• Cooling Capacities: 3, 3.5, 4, 5 and 6 tons (36,000 BTUH to 72,000 BTUH)

ASDCHA HIGH EFFICIENCY MODELS:

• EER: 10.0

• Cooling Capacities: 3, 3.5, 4 and 5 tons (36,000 to 60,000 BTUH)

HSDCA ULTRA HIGH EFFICIENCY MODELS:

• EER: 10.5 - 11.5

• Cooling Capacities: 3, 3.5, 4 and 5 tons (36,000 to 60,000 BTUH)

SAFETY LISTED AND ENERGY CERTIFIED

The ASDCA air conditioners are built to UL standard 1995, latest edition and CAN/CSA C.22.2, No. 236, 3rd edition. For energy  efficiency and performance, the units are tested and rated in accordance to the current ANSI/AHRI (Air-Conditioning Heating and Refrigeration Institute Standard 390 (Single Package Vertical Units). All units meet or exceed the efficiency requirements of ANSI/ASHRAE/IESNA 90.1.2010. The ASDCA units are commercial units and not intended for residential use.

STANDARD FEATURES

• Designed for Operation in Low Ambient Conditions

• Low ambient control cycles condenser fan to maintain proper refrigerant pressures. Allows operation in mechanical cooling (compressor) of our standard air conditioners down to 20°F (-7°C). With the Extreme Duty option, the units will operate down to 0°F (-18°C). Note: low temperature operation is affected by ambient conditions, e.g. wind and humidity

• Three minute by-pass of the low pressure switch for start-up of compressor when outdoor temperatures are below 55°F (13°C)

• Factory built-in economizer

HIGH EFFICIENCY

• High efficiency compressor

• Lanced fins standard on all evaporator and condenser coils

BUILT-IN RELIABILITY

• High pressure switch and low pressure switch with lockout protects refrigerant circuit

• Adjustable .03 to ten minute delay on make for short cycle protection

• Remote Alarm Capability

• Dry contacts can be used for remote alarm or notification upon air conditioner lockout

EASE OF INSTALLATION

• Sloped top with flashing eliminates need of rainhood

• Built-in mounting flanges facilitate installation and minimize chance of water leaks

• Supply and return openings exactly match previous models

• Factory installed disconnect on all units

• Single Point Power Entry complies with latest edition of U.L. Standard 1995

RUGGED CONSTRUCTION

• Copper tube, aluminum fin evaporator & condenser coils

• Field or factory installed heaters on discharge side of evaporator coil (optional)

• Baked on neutral beige finish over galvanneal steel for maximum cabinet life (Other finishes are available)

EASE OF SERVICE

• Service access valves are standard

• Standard 2” (50 mm) pleated filter with a MERV rating of 8 changeable from outside

• All major components are readily accessible

• Front Control Panel allows easy access and complies with NEC clearance codes on redundant side-by-side systems

• LEDs indicate operational status and fault conditions.

• Foiled backed insulation on the indoor air path.

• A minimum position potentiometer that can be adjusted to prevent the economizer damper from closing completely. This control ensures that whenever the evaporator fan is operating, fresh air is being introduced into the building.

For detailed specifications, performance, and efficiency information, download the Product Data Sheet from the document list on this page.