JOHNSON CONTROLS
10
FORM 115.20-NOM6 (1106)
MAINTENANCE
MOTOR
The blower motor should be cleaned annually and if it
has oiling ports, it should be oiled with a good grade
of SAE 20 oil. Normally a few drops of oil in each
bearing is sufficient.
COIL
The coil must be kept clean by any of the following
methods.
1. Cleaning with low-pressure compressed air.
2. Flushing or rinsing with water (a detergent is
advisable for greasy surfaces).
FILTERS
The intervals at which filters require replacement
depend on local conditions.
Because of dust and lint in the room, room-air filters
load up much more rapidly than outdoor-air filters.
Under normal conditions, the room air filter requires
replacement every six to eight weeks.
Clean or replace air filters regularly
Dirty filters reduce the air and heating
capacities of the unit. When the filters
are excessively dirty, the unit heating
capacity will be so reduced that it is in-
effective for heating the room. When
a room fails to heat, always check the
filters.
To ensure proper maintenance of the filters, it is best
to follow an organized maintenance procedure. The
following one is recommended:
Divide the total number of units on the job into six
equal groups. Each week inspect, clean or replace
the filters in each group, in rotation. This insures
a uniform servicing interval. The interval may be
lengthened or shortened as determined by experience.
If inspection shows only the room-air filter to be dirty,
this one alone should be replaced.
CLEAN UNIT INTERIOR
Once a year clean the fans and coils of the unit thor-
oughly. Remove the access panel as necessary.
Wipe the interior of the unit clean with a rag. Wipe
the motor and inside and outside of the fan housings.
(In cooling units, clean out the drain pan.)
