Mechanical Specifications
Heat Pumps
General
Unit shall be assembled on heavy gauge steel mounting/lifting rails and shall be weather proofed. Unit shall include a hermetic scroll or reciprocating compressor(s), plate fin condenser coil, fans and motors, controls, and holding charge of nitrogen. Operating Range shall be between 115° F (46°C) and 50°F (10°C) in cooling as standard from factory. Unit shall be UL 1995 listed and rated in accordance with ARI Standard 340/360.
Casing
Unit casing shall be constructed of zinc coated, heavy gauge, galvanized steel. Exterior surfaces shall be cleaned, phosphatized, and finished with a
Refrigeration System — Single Compressor
TWA075A,TWA100A units shall have a single refrigeration circuit. Each refrigeration circuit has an integral subcooling circuit. A refrigeration filter drier, expansion valve, and check valves shall be provided as standard.The unit shall have both a liquid line and suction gas line service valve with gauge port.
Unit shall have one direct drive,Trane hermetic scroll compressor with centrifugal oil pump providing positive lubrication to moving parts. Motor shall be suction
Refrigeration System — Dual
Compressor
TWA155B,TWA200B units shall have two separate and independent refrigeration circuits. Each refrigeration circuit shall have an integral subcooling circuit. A refrigeration filter drier shall be provided as standard. Unit shall have both a liquid line and suction gas line service valve with gauge ports.
Unit shall have twoTrane direct drive, hermetic scroll compressors with centrifugal oil pump and provide positive lubrication to all moving parts. Motor shall be suction
Condenser Coil
Coils shall be internally finned or smooth bore, 3/8" (10mm) copper tubes mechanically bonded to a configured aluminum plate fin as standard. Coil shall be factory pressure and leak tested to 420 psig (2,930 kPa) air pressure. Metal grilles with PVC coating for coil protection is optional.
Condenser Fan And Motor(s)
Controls
Heat pump units shall be completely factory wired with necessary controls and contactor pressure lugs or terminal block for power wiring. Control wiring
shall be
Defrost Controls
Electronic timed initiated, temperature terminated defrost system with choice of 50, 70, or 90 minute cycle shall be included.Timed override limits defrost cycle to 10 minutes.
Low Ambient Operation
Standard units shall start and operate to approximately 50°F (10°C) when matched withTrane air handlers and coils. Optional head pressure control accessory permits operation to 0°F
ACCESSORIES
Low Ambient Head Pressure Control — This accessory shall modulate the RPM of unit outdoor fan motor in response to outdoor ambient temperatures and liquid line temperature. Accessory provides unit cooling operation to outdoor temperatures of 0°F
Vibration Isolation Packages
Time Delay Relay
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