Service - Lennox LGH480 Installation Instructions Manual

Service

IMPORTANT
Mineral oils are not compatible with R410A. If oil must
be added, it must be a polyol ester oil.
CAUTION
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dan­
gerous operation. Verify proper operation after ser­
vicing.
The unit should be inspected once a year by a qualified
service technician.
A-Filters
Units are equipped with eleven 16 X 25 X 2" (406 X 635 X
51mm) or 16 X 25 X 4" (406 X 635 X 102mm) supply air
filters. Filters should be checked monthly and replaced
when necessary with filters of like kind and size. Remove
filters as shown in figure 56. Take note of air flow direction
marking on filter frame when reinstalling filters. See figure
57 for orientation of replacement filters.
NOTE-Filters must be U.L.C. certified or equivalent for use
in Canada.
REMOVE FILTERS
FIGURE 56
Units equipped with optional outdoor air intake hoods
contain four 20 X 25 X 2" (508 X 635 X 51mm) aluminum
cleanable filters. See figure 58 for location of filters. On
horizontal air discharge installations, remove two screws
and pivot screen to access filters. See figure 48.
OUTDOOR AIR FILTERS
- VERTICAL AIRFLOW
PULL TO
REMOVE
FILTERS
RETURN AIR
END OF UNIT
Page 60
ORIENT REPLACEMENT FILTERS
FIGURE 57
OUTDOOR AIR FILTERS
OUTDOOR AIR FILTERS -
HORIZONTAL AIRFLOW
FIGURE 58
LGH/LCH420, 480, 540, 600