Thermo Pride Gas/Propane Furnace Concentric Vent (CMA) - Manual (Page 7)

ALL INSTALLATIONS AND SERVICE MUST BE PERFORMED BY QUALIFIED SERVICE PERSONNEL.
CARBON MONOXIDE POISONING, FIRE AND EXPLOSION HAZARD.
Failure to follow this warning could result in death, personal injury and/or property damage.
When using the alternate screw assembly method, drill a clearance hole in the rain cap and a
pilot hole in the vent pipe for screw size being used. Failure to drill adequate holes cause
cracking o the PVC components, allowing flue gasses to be recirculated.
9. Drop the 2” pipe assembly (FIG-7) thru the 3” pipe, seat rain cap tightly on end of 3” pvc
pipe.
CARBON MONOXIDE POISONING, FIRE AND EXPLOSION HAZARD.
Failure to follow this warning could result in death, personal injury and/or property damage.
Do not operate the furnace with the rain cap removed as recirculation of the flue gases may
occur. Water may also collect inside the larger combustion air pipe and flow to the burner
enclosure.
10. Install ceiling flashing plate over the protruding vent assembly in ceiling. Secure with
screws or an appropriate fastener, see FIG-8.
11. Clamp and seal 3” pipe to flashing plate with factory supplied clamp, see Fig-8.
12. At this point the WYE fitting can be applied using PVC cement to affix it to the 3”
diameter pipe, see FIG-8.
13. Using field supplied PVC pipe and elbows connect the center vent pipe on the WYE
fitting to the exhaust vent pipe on the furnace and the 45
° air intake pipe on the WYE
fitting to the combustion air intake pipe on the furnace. PVC cement all joints except for
the final connection to the furnace. Use radiator hose fittings and clamps included with
furnace to make final connection, see FIG-8.
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