Trane SCXG-SVX01B-EN manual Mechanical Specifications, Duct Connections, Water Piping

Mechanical Specifications

Duct Connections

￿WARNING

Hazardous Voltage w/Capaci- tors!

Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout proce- dures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided byTrane or others, refer to the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors.Verify with an appropriate voltmeter that all capacitors have discharged. Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury.

Note: For additional information regard- ing the safe discharge of capacitors, see PROD-SVB06A-EN or PROD-SVB06A-FR.

Return air enters the rear of the unit and conditioned supply air discharges through the top. Attach supply air ductwork directly to the unit’s top panel, around the fan discharge opening. A duct collar is not provided.

Note: Units equipped with the flexible horizontal discharge plenum option may include a duct collar when holes are factory cut. If discharge openings are field-cut, refer to the “Plenum Installation” section.

Install all air ducts according to the National Fire Protection Association standards for the “Installation of Air Conditioning andVentilation Systems other than ResidenceType (NFPA 90A) and ResidenceTypeWarm Air Heating and Air Conditioning Systems (NFPA 90B).

Make duct connections to the unit with a flexible material such as heavy canvas. If

Note:The compressors and fan assembly are internally isolated.Therefore, external isolation devices (spring mounting isolators) are at the discretion of a vibration specialist consulted by the building or HVAC system designer.

Run the ductwork straight from the opening for a minimum of three fan diameters. See Figure I-MR-1. Extend remaining ductwork as far as possible without changing size or direction. 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. Align the fan outlet properly with the ductwork to decrease noise levels in the duct and to increase fan performance. To complete trunk ductwork to theVAV terminal units, refer to theVAV box manuals for specific requirements. Check total external static pressures against fan characteristics to be sure the required airflow is available throughout the ductwork.

To achieve maximum acoustical perfor- mance, minimize the duct static pressure setpoint.

Discharge

Duct

3 Fan

3-inchDiameters

Flexible

Duct

Return

Air

Water Piping

￿WARNING

High PressureWater!

Provide relief valves on system water piping to prevent instantaneous release of high pressure water. Failure to provide relief valves could result in death or serious injury or water pump damage or unit failure.

Condenser Connections

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.

Note: Four condenser waterline drain plugs ship in a bag in the unit’s left end. The installer must field install these four plugs using pipe thread sealer. An additional plug is provided for units with a waterside economizer.

1.Attach the water supply line to the inlet connection, and the return line to the outlet connection. Entering and leaving water connections for all condensers are factory manifolded and require only single connections for entering and leaving water. If the unit has a waterside economizer and/or control valves, the factory pipes between these components.

2.If using a cooling tower, refer to Figure

I-MR-2 for a typical piping circuit from the unit.

3.Ensure the water pressure to the unit does not exceed 400 psig.

Note: To prevent water pump damage, design system piping to provide relief when using energy saving waterside economizer valves.

afire 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.

Figure I-MR-1. Duct connection recommenda- tions

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