Trane UNT-SVX07A-EN Mechanical, Duct Connections, Piping Considerations, Hydronic Coil Piping

mechanical

Installation requirements

Duct Connections

Install all air ducts according to National Fire Protection Association standards for the Installation of Air Conditioning and Ventilating Systems (NFPA 90A and 90B). 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).

WARNING Hazardous

Voltage w/Capacitors! Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/tagout procedures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided by Trane 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.

The unit’s airflow configuration varies dependent on the model and options ordered. A one-inch duct collar is provided on units with a ducted return and/or discharge to attach ductwork to the unit.

Trane recommends using galvanized sheet metal ductwork with fan-coil and cabinet heater units. Slide the sheetmetal duct over the duct collar flange of the unit, seal the joint and fasten with sheetmetal screws.

Note: Do not run screws through the removable front panel on concealed units.

Ductwork Recommendations Follow the general recommendations listed below when installing ductwork for the unit.

1.Discharge ductwork should run in a straight line, unchanged in size or direction, for a minimum equivalent distance of three fan diameters from the unit (approximately 20 inches).

2.When making duct turns and transitions avoid sharp turns and use proportional splits, turning vanes, and air scoops when necessary.

3.When possible, construct, and orient supply ductwork turns in the same direction as the fan rotation.

Piping Considerations

Hydronic Coil Piping

Before installing field piping to the coil, consider the following .

•All coil connections are 5/8-inch O.D. (or 1/2-inch nominal) female copper connections.

•The supply and return piping should not interfere with the auxiliary drain pan or condensate line. See “Connecting the Condensate Drain” section for more detailed information.

•The installer must provide adequate piping system filtration and water treatment.

•Exterior condensate may be an issue (fan-coils only) if field piping does not have a control valve. Refer to the supply and return header locations in the “Dimensions and Weights” section.

Note: When using a field supplied piping package in a fan-coil unit, allow sufficient room to install the auxiliary drain pan. In addition, piping package must not extend over edges of auxiliary drain pan.

Connecting field piping to coil

1.Remove the auxiliary drain pan, if it is in place, to prevent exposureto dripping solder or excessive temperatures.

2.Slide a 1/2-inch sweat connection coupling (installer provided) onto the coil headers.

Note: For vertical fan-coil units, push the main condensate drain hose and overflow condensate drain hose through the inside of the chassis end panel to prevent them from getting burned when making sweat connections. Be sure to pull the hoses back through and route to the auxiliary drain pan when the end panel has cooled.

3.Solder the joint using bridgit lead-free solder (ASTM B32-89) to provide a watertight connection. Avoid overheating factory soldered joints when soldering field connections to the coil to prevent leakage from occurring.

4.Insulate all piping to coil connections as necessary after connections are complete.

Note: Maintain a minimum distance of one foot between the reduction fitting for the 1/2-inch diameter line and the fan-coil unit piping connections.

5.Install the optional auxiliary drain pan, which ships in the accessory packet.

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