mechanical
Installation requirements
Duct Connections
Install all air ducts according to the National Fire Protection Association standards for the “Installation of Air Conditioning and Ventilation Systems other than Residence Type (NFPA 90A) and Residence Type Warm Air Heating and Air Conditioning Systems (NFPA 90B).
Make duct connections to the unit with a flexible material such as heavy canvas. If a fire hazard exists, Trane recommends using Flexweave 1000, type FW30 or equivalent canvas. Use three inches for the return duct and three inches for the discharge duct. Keep the material loose to absorb fan vibration.
Run the ductwork straight from the opening for a minimum of three fan diameters. Do not make abrupt turns or transitions near the unit due to increased noise and excessive static losses. Use elbows with splitters or turning vanes to minimize static losses.
Poorly constructed turning vanes may cause airflow generated noise. Check total external static pressures against fan characteristics to be sure the required airflow is available throughout the ductwork.
WARNING
Hazardous Voltage! Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure power cannot be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.
Water Piping
Condenser Connections
Note: To prevent water damage, install piping drain and vent plugs.
Condenser water piping knockouts are in the lower left end panel. If necessary, remove insulation to gain access. All field installed piping must conform to applicable local, state, and federal codes. To complete condenser water connections follow the procedure below.
1.Remove back panel to access the water connection fittings.
2.Attach the water supply line to the inlet connection, and the return line to the outlet connection. The water connection fittings are copper, so exercise extreme care when connecting steel piping to copper fittings.
3.Ensure that water piping is aligned to the unit connection fittings. Failure to align piping could cause stripped threads, leakage, and possible unit failure.
4.Connection to the unit water piping requires a backing wrench to prevent distortion of connecting tubing. Apply backing wrench to water connection points on unit.
Condensate Drain Connections Install a water regulating valve in the water supply line to maintainhead pressure when operating with city water of varying temperature.
These units require a minimum water pressure of 15 psig and will operate at a maximum of 400 psig.
Provide safeguards against cold weather drain line freeze.
Cooling Tower Piping
Cooling tower control affects the unit cycle rates. Condenser water temperature swings from
The cooling tower system requires a separate drain in the water supply line for service and repair.
Water Temperature Requirements Install a water regulating valve in the water supply line to maintain head pressure when operating with water of varying temperature. The valve modulates condenser water flow to control condensing pressure. The valve opens or closes in response to compressor discharge pressure as sensed by its capillary line connection iin the liquid line shrader valve. When the valve is properly installed, water flow automatically decreases as discharge pressure falls and increases as discharge pressure rises. Field installation of the water regulating valve assembly requires one valve for each refrigeration circuit.
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