Downflow Vertical, Downflow Horizontal

Installer’s Guide

The trap must be repositioned to the exterior of the cabinet. Remove the trap from its present location and reposition the trap outside of the unit, through the long circular hole, next to the secondary recuperative cell. Remove the larger drain line (from the secondary cell) and trim to fit between the secondary cell and the new trap location. On upflow units, plug the hole in the blower deck where the tube went through.

Remove the hose from the induced blower and reposi- tion into the other drain tap of the inducer, which is lo- cated 90° clockwise around the inducer. Move the cap from that drain tap to the unused drain tap. On upflow units, plug the hole in the blower deck where the tube went through. This tube on downflow units will need to be cut to fit between the inducer and the trap. On up- flow units, this tube may need to be extended, using the tubing shipped with the furnace.

Left side

DOWNFLOW (VERTICAL)

Right

side

DOWNFLOW	Use CPVC tubing from Trap outlet,
(VERTICAL)	over burner box to cabinet exit

Cut off curved end of

Inducer drain hose

DOWNFLOW (HORIZONTAL)

Connections must be made to an OPEN/ VENTED DRAIN. Outdoor draining of the furnace and coil con- densate is permissible if allowed by local codes. Caution should be taken to prevent drains from freezing or caus- ing slippery conditions that could lead to personal in- jury. Excessive draining of condensate may cause satu- rated ground conditions that may result in damage to plants.

NOTE:

Use 1/2" or larger PVC or CPVC pipe and fittings as re- quired for drain connections (fittings, pipe and solvent cement not provided).

NOTE:

A corrosion resistant condensate pump must be used if a pump is required for a specific drain system.

IMPORTANT:

The condensate drain should be installed with provisions to prevent winter freeze-up of the condensate drain line. Fro- zen condensate will block drains, resulting in furnace shut- down. If the drain line cannot be installed in a conditioned space, then UL listed heat tape should be applied as re- quired to prevent freezing (per manufacturer’s instructions). The heat tape should be rated at 5 or 6 watts per foot at 120 volts. Self-regulating (preferred) or thermostatically controlled heat tape is required.

Evaporator and furnace condensate drain piping may be manifolded together. A primary drain vent stack must be installed and terminated below the outlet of the secondary heat exchanger drain connection to pre- vent water from damaging furnace controls if the pri- mary drain outlet plugs up. Where the furnace is in- stalled above a finished ceiling, the primary drain vent stack must be installed such that overflow from the vent stack opening will flow into an axillary drain pan in order to prevent water damage to the finished ceiling below.

26	18-CD22D1-8