K. Filters - Thermo Pride CDX1-100N Installation And Operation Manual

All installations and services must be performed by qualified service personnel.
2. A drip leg must be used on both LP and natural gas installations prior to the furnace in order to trap
oil, condensate and other impurities which might otherwise lodge in the gas valve or plug the burner
orifice. A drip leg shall be provided at the outlet of the gas meter when there is excessive
condensation between the gas meter and the furnace. Failure to install a drip leg may void the limited
warranty on the furnace.
: All gas piping must be leak tested using a soap and water solution (when the gas is
turned on) following the procedure outlined in Section III, J, of this manual. A final test for gas
leakage must be made after purging the gas line (refer to Section IV, B, of this manual). This test
must be conducted with the unit operating and should include the furnace piping and gas valve.
Never use an open flame to check for a gas leak.
: Care must be taken not to wet electronic components during leak test. Wetting the
primary ignition module may damage its 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.

K. FILTERS

1. CHX1 MODELS: HIGHBOYS
It is necessary to cut the return air opening in the bottom or side casing depending upon the needs of the
specific installation.
NOTICE: If your CHX1 will require air delivery above 1800 CFM, it is advisable that both sides, a
combination of 1 side and the bottom, or the bottom only be used for return air. (If a return is cut in the
bottom, it should be as large as the return opening in the equivalent CDX1 model. (See specification sheet
in beginning of this manual).
Figure 18
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