McQuay PDHA Especificaciones descargar pdf (Pagina 39)

Catalog 1300-1 / Page 39 of 42

Engineering Guide Specications – PDAC/PDHP 16" × 42"

Furnish and install where shown on plans (packaged terminal air conditioners) (packaged terminal heat pumps) of

the sizes and capacities shown on the schedule. The units shall be located as shown on the drawings and shall include

cabinet/wall sleeve, chassis, outdoor louver, and room cabinet. (Units furnished with hydronic heat shall also include a

hydronic subbase, valve and appropriate controls).

All units shall be UL listed for safety and ETL certied for performance. Units shall be McQuay Comfort

Conditioner, PDAA/PDHA, PDAF/PDHF or equal. Overall dimensions for the basic unit shall not exceed 42

/2"

wide, 16

/2" high, and 22" deep. (Overall dimensions of the wall sleeve shall not exceed 16" high, 42" wide and 13

/4"

deep).

(Units furnished with hydronic heat shall not exceed 43" wide, 24

/2" high and 20" deep).

(Units furnished with an electrical subbase shall not exceed 43

" wide, 24

/2" high and 22" deep).

All units shall operate on ____ volts, 60 Hz, single-phase power.

The minimum energy efciency ratio (EER) in BTU per hour per watt for each unit must be in compliance with

ASHRAE 90.1 replacement or new construction criteria, for all sizes using R-410A refrigerant.

(The minimum COP for heat pumps, at 47

F DB outdoor, must be 2.9 for all sizes).

Heating/Cooling chassis – Chassis shall be slide-in, plug-in type with a self-contained, hermetically sealed

refrigerant circuit. All chassis sheet metal parts shall be constructed of either powder-coated A-60 or G-60 galvanized

steel for maximum corrosion resistance. The chassis shall consist of the following components:

Vibration isolated compressor; ried copper tubed evaporator and condenser coils with high efciency raised lance

aluminum plate ns mechanically expanded to the tubes for maximum heat transfer; and a capillary restrictor type

refrigerant metering device. Coils shall be factory tested at 300 psig. (Heat pump models shall also include reversing

valve and charge balancing device). A positive closing automatic or manual fresh air damper may be located within

the chassis to provide fresh air during fan operation. An optional boost fan is available to provide additional airow,

for enhanced Indoor Air Quality (IAQ).

Indoor Air Quality Boost Fan (Option) – The IAQ Boost Fan shall operate in conjunction with the Fresh Air

Damper and increase the volume of fresh air to 90 CFM. The Fresh Air Damper and Boost Fan shall operate when the

following conditions are met:

■ Damper setting in the touchpad set-up mode is “AU” (automatic) AND

■ Indoor fan motor turns on AND

■ Outdoor Air Sensor (OAS) temperature is greater than 40°F but less than 90°F AND

■ Indoor Air Sensor (IAS) temperature greater than 50°F.

Airow system shall include separate fan motors for the condenser and evaporator sections. The condenser fan

motor shall be a single-speed, totally enclosed, permanently lubricated fan motor. Condenser fan shall be propeller-

type with a slinger ring and shall be constructed of aluminum. The indoor fan motor shall be a two-speed, totally

enclosed; permanently lubricated fan motor must be positioned on the indoor side of the bulkhead so as to be

completely within the conditioned, ltered airstream. The indoor blower fan shall be a forward-curved tangential

design to provide even airow across the evaporator coil.

During the cooling cycle:

The compressor, the outdoor fan motor and the indoor fan motor shall be energized. Condensation accumulated on

the evaporator coil shall be drained into the outdoor section where it is to be picked up by the condenser fan/slinger

ring and evaporated against the outdoor coil. In the cool mode, the compressor will cut in if the space temperature is

at least 1°F above the thermostat set point and will cut out when the space temperature is approximately 2°F below set

point, subject to timing protections.

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McQuay PDHA Especificaciones Pagina 39

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