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All installations and services must be performed by qualified service personnel.
PLEASE NOTE: While scribing the return air opening, the filter rack can be held in position by tape or similar
temporary means.
Fig. 2: A typical filter rack and dimensions for the CSHB60-90 furnace.
Position the open end of the filter rack so as to provide access for filter replacement. Once the filter rack is
positioned correctly, scribe a line along the inside of the securing flange on three of the sides. To scribe a line on the
fourth side (the open end), use the open end support as a guide.
Remove the filter rack and cut the return air opening in the casing. Now the filter rack can be anchored to the
furnace with screws or pop-rivets through the securing flange of the filter rack.
Connect the return air plenum to the filter rack and slide the filter into place. Dimensions for adapting the return air
plenum to the filter rack are provided (See Fig. 2).
E. LIMIT POSITION AND LOCATION
cWARNING: The predetermined limit location on this Crown oil fired furnace has been
tested and approved by Thermo Products, LLC. Any attempt to relocate this safety control or
replace this safety control with a control that is not approved, or is incompatible, may result in
personal injury, substantial property damage or death.
The unit listed in the table below must have the fan and limit control installed at the time of unit installation.
TABLE 2: Installation location of
the fan and limit control for each
furnace
Fig. 3: Limit location for CSHB60-90
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