Trane UniTrane Fan-Coil & Force Flo Air Conditioners, UNT-SVX07A-EN manual Condensate Drain

mechanical

Installation requirements

Water Piping Connections to Factory- Installed Piping Package

Before installing water piping supply and return lines to factory piping package, note the following items.

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

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

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

•If the unit has a factory deluxe piping package, the piping includes a strainer with a 20-mesh size screen, which allows minimal protection from debris. Therefore, clean the strainer regularly.

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

1.The factory piping package ships with brackets to adequately support the piping during shipment. Remove these brackets before connecting water piping to the unit.

2.Close the piping end valves to the fully open position to prevent damage to the valve seat during brazing.

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

4.Solder water piping connections to supply and return end connections. Avoid overheating factory soldered joints to prevent the possibility of leakage.

5.Insulate fan-coil piping to auxiliary drain pan connections and any piping that is not above the auxiliary drain pan.

Condensate Drain

1.De-burr the pipe end before making the connection to the drain pan.

2.Connect a 7/8-inch O.D. copper pipe or tube, with a 0.20 inch wall thickness, to the auxiliary drain pan. This should be a mechanical connection that allows easy removal of the auxiliary drain pan when servicing the piping end pocket.

3.Slide the copper pipe over the drain pan nipple and tighten the collar on the pipe with a hose clamp (installer supplied).

Maintain a continuous drain line pitch of one inch per ten feet of drain line run to provide adequate condensate drainage. Extend the drain line straight from the drain pan a minimum distance of six inches before making any turns. The installer must provide proper support for the drain line to prevent undue stress on the auxiliary drain pan.

Install a secondary overflow drain line if necessary by punching out the overflow drain nipple on the auxiliary drain pan.

Next, place a 3/8-inch inside diameter flexible plastic tube over the nipple and secure with a field supplied hose clamp.

Note: The installer is responsible for adequately insulating field piping. See the “External Insulating Requirements section for more information.

Condensate Overflow Detection Device The condensate overflow detection device is an option on fan-coil units with either a Tracer ZN010, ZN510, ZN520 or the customer-supplied control interface. The float switch, mounting bracket, and coiled leads ship attached inside the piping end pocket of the unit. Install the switch by placing the hole or slot in the bracket over the condensate overflow drain (of the auxiliary drain pan) with the switch float extending over the pan. Secure the drain pan by attaching the pan’s bracket with the factory provided clip. See Figures I-MR-1 and I- MR-2.

Figure I-MR-1. Condensate float switch installed in horizontal auxilliary drain pan.

Automatic Changeover Sensor Two-pipe changeover units with either the Tracer ZN010, ZN510, and ZN520 controls have an automatic changeover sensor that determines heating or cooling mode based on the supply water temperature. On units with a factory piping package, the factory straps the changeover sensor to the piping supply water pipe. See Figure I-MR-3 and I-MR- 4.

If the unit does not have a factory piping package, the factory attaches the sensor and coiled lead wires to the piping side end panel. The installer should attach the sensor parallel to and in direct contact with the supply water pipe.

Note: The installer is responsible to ensure the changeover sensor is installed in a location that can sense active water temperature. Otherwise, the unit may fail to sense the correct operating mode and disable temperature control.

When using field supplied three-way valves, install the changeover sensor upstream of the valve on the supply water pipe. When using field supplied two-way control valves, install the changeover sensor in a location that will detect active water temperature. The unit must always be able to sense the correct system water temperature, regardless of the control valve position.

Note: The maximum length of the automatic changeover wire cannot exceed ten feet from the control panel. If the sensor extends beyond the unit chassis, use shielded conductors to eliminate radio frequency interference (RFI).

Figure I-MR-2. Condensate float switch installed in vertical auxilliary drain pan.

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