Lennox International Inc Essential Maintenance for Your Lennox 15GCSXAV: Condensate Drain and Filter Tips

Condensate Drain

The 15GCSX unit is equipped with a 3/4 inch FPT coupling for condensate line connection. Plumbing must conform to local codes. Use a sealing compound on male pipe threads.

The drain line must be properly trapped and routed to a suitable drain. See figure 5 for proper drain arrangement. The drain line must pitch to an open drain or pump a minimum of 1 inch per 10 feet to prevent clogging of the line. The drain line must be supported so that weight of drain line is not carried by drain line connection. Seal around drain connection with suitable material to prevent air leakage into return air system.

Drain piping should not be smaller than drain connection at coil. An open vent in drain line will some times be required due to line length, friction and static pressure. Drains should be constructed in a manner to facilitate future cleaning.

NOTE − The condensate drain line MUST be trapped to provide proper drainage.

CAUTION

Condensate line connection must be hand−tight- ened. Do not use tools

Typical Condensate Drain

Minimum Pitch 1 in. (25 mm) per

10’ (3 m) of line

UNIT

OPEN

VENT

Filters must always be installed ahead of evaporator coil and must be kept clean or replaced. Dirty filters will reduce the airflow of the unit. Filter sizes are shown in table 1.

Trap must be deep enough to offset maximum	MOUNTING
	FRAME
static difference (Generally, 3 inches minimum).

Figure 5

Filters

Filters are not factory−supplied with the unit; however, optional internally installed filter kits are available. Filter kit 92M54 is used with 2, 2−1/2 and 3−ton units. Filter kit 92M55 is used with 3−1/2, 4 and 5−ton units. The filter kits accommodate the use of 1", 2" or 4" filters. If the optional filter kit is not used, a filter must be field−installed.

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