5 − If unit will be started immediately upon completion of installation, prime trap per procedure outlined in Unit Start−Up section.
Condensate line must slope downward away from the trap to drain. If drain level is above condensate trap, condensate pump must be used. Condensate drain line should be routed within the conditioned 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. Heat cable kit is avail- able 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.
CONDENSATE TRAP LOCATION
(shown with right side exit of condensation)
ML193DF with Evaporator Coil
Field−Provided Vent |
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Trap can be installed a
maximum of 5 ft. from furnace.
(*PVC Only)
1" min.
5’ max. 
Field Provided Vent
min. 1" Above
Condensate Drain
FIGURE 44
CAUTION
Do not use copper tubing or existing copper condensate lines for drain line.
CAUTION
to drain
*Piping from furnace must slope down a minimum of 1/4" per ft. toward trap.
FIGURE 43
A separate drain line must be run to the drain from the condensate trap to ensure proper drainage and pressure switch operation. DO NOT connect the condensate trap drain into the drain line from the evaporator coil.
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