Thermo Pride CLHS1-050P36N Installation And Operation Manual page 28

All installations and services must be performed by qualified service personnel.
: Care must be taken not to wet electronic components during leak test. Wetting the electronic
components may damage their circuitry and cause a hazardous situation. Dry moisture from all leads and
terminals if wetting occurs. Wait at least 24 hours for the circuit to fully dry before energizing the burner circuit.
J. REQUIREMENTS AND SIZING OF DUCT WORK
The duct system must be sized and installed by a qualified installer or service person, following the design standards
of the Air Conditioning Contractors of America (ACCA) or ASHRAE.
1. When it is located in the same room as the furnace, a return air register must be installed a minimum of 20 feet
away from the furnace.
2. When a furnace is installed so that supply ducts carry air circulated by the furnace to arears outside the space
containing the furnace, the return air shall also be handled by ducts(s) sealed to the furnace casing and terminating
outside the space containing the furnace.
3. The return air duct system must equal the supply air duct system in its capabilities. Use a supplier's catalog for
proper sizing of outlet and return air registers and grills to ensure that they meet the CFM requirements of the run to
which they are connected.
4. If the furnace is used in connection with an air conditioning evaporator coil, the furnace must be installed parallel
with or on the upstream side of the coil, to prevent condensation in the heat exchanger. If the evaporator coil is
installed with a parallel flow arrangement, dampers or other means to control flow of air should be installed to
prevent chilled air from entering the furnace. If such a device is manually operated, it must be equipped with a means
to prevent operation of either the furnace or air conditioner unless it is in the full heat or cool position.
We recommend that the outlet duct be equipped with a removable access panel to allow for visual inspection of the
heat exchanger to check for leakage or to allow for insertion of a probe sampler in the air stream. This removable
access cover should be attached to ensure there is no air leakage.
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