Condensate Piping
This unit is designed for either right- or
NOTE − If necessary the condensate trap may be installed up to 5 feet away from the furnace. Piping from furnace must slope down a minimum of 1/4" per ft. toward trap.
NOTE − Vinyl tubing may be used for condensate drain. Tubing must be 1−1/4" OD X 1" ID and should be attached to the drain on the trap using a hose clamp.
CONDENSATE TRAP AND PLUG LOCATION (shown with left side exit of condensation)
1−1/2 in. 
3 − Install drain trap using appropriate PVC fittings, glue all joints. Glue the provided drain trap as shown in fig- ure 34. Route the condensate line to an open drain.
4 − If unit will be started immediately upon completion of installation, prime trap per procedure outlined in Unit Start−Up section.
Condensate line must be sloped downward away from condensate trap to drain. If drain level is above con- densate trap, condensate pump must be used. Con- densate drain line should be routed within the condi- tioned space to avoid freezing of condensate and blockage of drain line. If this is not possible, a heat cable kit may be used on the condensate trap and line. Heating cable kit is available from Lennox in various lengths; 6 ft. (1.8m) − kit no. 26K68; 24 ft. (7.3m) − kit no. 26K69; and 50 ft. (15.2m) − kit no. 26K70.
CAUTION
Do not use copper tubing or existing copper condensate lines for drain line.
CONDENSATE TRAP LOCATION
(shown with right side exit of condensation)
Trap | Plug |
(same other right side) | (same on left side) |
FIGURE 32
1 − Determine which side condensate piping will exit the unit, location of trap, field−provided fittings and length of PVC pipe required to reach available drain.
2 − Remove plug (figure 32) from the cold end header box
Trap Can Be Installed a |
Maximum Of 5’ From Furnace |
(PVC Only) |
1" min. |
*5’ max. |
to drain
Field−Provided Vent
min. 1" Above
Condensate Drain
at the appropriate location on the side of the unit. Install 1/2 NPT male field provided fitting into cold end head- er box. Do Not Over Tighten. Use teflon tape or ap- propriate pipe dope.
*Piping from furnace must slope down a minimum of 1/4" per ft. toward trap.
FIGURE 33
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