Thermo Pride CMA3-50D36N Installation And Service Manual page 26

the conclusion of the vent pipe installation. This will insure a leak free return air
compartment. Refer to Figure 6A.
Figure 6A.
NOTICE: The exhaust vent pipe must be supported every 4 feet. After making
sure the length of the piping is correct glue all connections in place.
: This CMA/CMC furnace has been designed to be installed as a
direct vent system and must have its combustion air brought in from
outside the conditioned space. The failure to install the vent/air intake
system as specified in these instructions will void the heat exchanger
warranty and may result in property damage, personal injury or loss of life.
NOTICE: The furnace model series CMA/CMC may be vented either
through the sidewall or the roof. For sidewall instructions, continue to the
following section. For roof venting, refer to Section IV J, of this manual.
NOTICE: The air intake pipe must be supported every 4 feet. After making sure
the length of the piping is correct, glue all connections in place except the
connection to the burner box.
If the combustion air piping is installed in a warm humid place, such as a laundry
room or above a suspended ceiling, it must be insulated with a 1.0" foil faced
insulation or its equivalent.
If the vent piping is run through an unconditioned space, it must be insulated with
a 1.0" foil faced insulation or its equivalent.
Outside combustion air must not come from an area that is
:
directly adjacent to a pool, hot tub or spa. Measures should be taken to
prevent the entry of corrosive chemicals or vapors to the combustion and
ventilation air supply. Such chemicals include but are not limited to
chlorinated and/or fluorinated hydrocarbons such as found in refrigerants,
aerosol propellants, dry cleaning fluids, degreasers and removers. Other
harmful compounds may come from bleaches, air fresheners or mastics.
Vapors from such products can form acid compounds when burned in a
23