York LD11556 User Manual

JOHNSON CONTROLS

FORM 115.20-NOM6 (1106)

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.

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).

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.

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.

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.)