Page 26
B−Indoor Coil
1− Clean or change filters.
2− Check connecting lines, joints and coil for evidence of
oil leaks.
3− Check condensate line and clean if necessary.
C−Indoor Unit
1− Clean or change filters.
2− Inspect coil. Clean if necessary.
3− Rotate blower wheel to check for binding bearings.
Lennox blower motors are prelubricated and sealed.
No further lubrication is required.
4− Adjust blower speed for cooling. The static pressure
drop over the coil should be checked to determine the
correct blower CFM. Refer to Lennox Engineering
Handbook for Static Pressure and CFM tables.
5− Check all factory and field-wiring for loose connec-
tions.
6− Check for correct voltage at unit.
7− Check amp-draw on blower motor (does not apply to
CB21.)
Unit nameplate_________Actual_________.
VI−Miscellaneous
If the fan orifice should ever need to be removed for ser-
vice, make sure the control box seals watertight before
placing the unit back in service. Figure 23 shows the com-
ponents used to make the control box watertight. Two
screws securing the top of the control box to the cabinet
must have rubber washers installed. Also, the control box
must be installed with a foam-rubber weatherstrip installed
along the top edge (between the control box and the cabi-
net).
FIGURE
23
HP21 CONTROL BOX
WEATHERPROOFING
WEATHERSTRIPPING BETWEEN
CONTROL BOX AND FAN ORIFICE
PANEL. USED TO PREVENT FAN
FROM THROWING WATER INTO
CONTROL BOX.
SCREWS WITH RUBBER WASH-
ERS. WASHERS PREVENT WATER
FROM DRIPPING INTO CONTROL
AREA. MAKE SURE WASHERS ARE
IN GOOD CONDITION AND MAKE
SURE SCREWS SEAT SECURELY
AND ARE NOT CROSS-THREADED.
CONTROL BOX
(HP21 -1 shown)
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