Thermo Pride CLQS1-050T36N Installation And Operation Manual page 34

All installations and services must be performed by qualified service personnel.
the cabinet. Attach the barb elbow to end of tube "A" and attach a piece of clear flexible tubing to the
barb, leading to the drain trap.
c. Attach clear flexible tubing from rubber drain at the exit of the inducer thru the cabinet to the drain
trap.
NOTICE: Condensate trap must be installed at least 2-1/2" below furnace.
6. Additional Requirements
Apply adhesive backed foam washers onto condensate tubing at the exit of the cabinet to seal the gap
created between tubing and knockout.
If the condensate trap is not primed at the time the furnace is powered up, the furnace will run and
eventually produce enough condensate to cause the furnace to shut off. At that time the condensate
will flow out of the heat exchanger into the trap and the furnace will restart, resuming normal
operation.
NOTICE: In all configurations, condensate drain tubing must be installed with continuous slope
down to the trap. Failure to do so will cause water to back into the furnace and prevent proper
operation. Damage to furnace and the creation of hazardous exhaust may occur.
CAUTION: Do not bypass pressure switches. They are critical safety features. If a pressure
switch functions, check for blockage. Do not circumvent pressure switches.
7. Plan, source, and install a condensate drain line using ½ inch diameter CPVC (chlorinated polyvinyl
chloride) thermoplastic pipe and pipefittings. In the event ½ inch PVC is preferred, a CPVC to PVC
adapter is included in the parts kit provided with the furnace. Route the line in the shortest possible
manner to reach a nearby drain. Secure all joints using cement. For gravity drainage, the condensate
drain line must maintain a minimum ¼ inch per foot downward slope toward the drain. The drain line
must be watertight, supported, and secured such that it cannot be easily moved.
NOTICE: If an air conditioning condensate drain line is combined with the furnace condensate
drain line, the air conditioning evaporator coil must have a separate trap installed ahead of the
connection joint.
8. A condensate pump may be required when,
 a suitable drain is not present,
 the drain is above the trap outlet level on the furnace, or
 the drain line cannot be sloped downward its full length to the drain.
9. CAUTION: Continual exposure to condensate may injure plants and damage certain building
materials, including many metals, wood, stone, and concrete.
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