5703827-XIM-A-0319
Johnson Controls Ducted Systems
65
General maintenance
In order to insure long and trouble free service from your system, we recommend periodic inspection, cleaning, lubrication, and
adjustment by your installing dealer or contractor. Be sure to ask about this service. For those who prefer to do-it-yourself, follow the
instructions listed below to care for your system.
Make sure that debris does not accumulate in or around the unit. Make sure that overhanging structures or shrubs do not obstruct
the outdoor air discharge, combustion air inlets, or vent outlets on your unit. These provide air for combustion and ventilation.
Adequate air is important to the safe and proper operation of the unit.
Inspecting the unit
To inspect the unit, complete the following actions.
• Check for obvious signs of deterioration of the unit.
• Check that the return and supply ducts attached to the unit are sound and air tight.
• Check that the unit's physical support, concrete slab, or roof curb is sound and not in need of repair.
• Make sure that there are no gaps between the roof curb and the unit where rain could leak into the building.
Air filters
All ZM units require four filters. The filter racks on these units receive either 1-inch or 2-inch filters. Filters can also be installed in the
building at a suitable return air location if an economizer or outside air accessory is not used.
NOTE:
Do not operate the unit without a filter.
Inspect filters once a month. Thoroughly clean the filters or replace them if it appears that they are beginning to accumulate
excessive dirt.
Installing air filters
1.
Remove the filter access panel. See Figure 2.
NOTE:
Install the filters with the Air Flow arrows pointing inward towards the indoor coil. In the event the spacers in the filter section
are removed, they must be reinstalled in their original position.
2.
Slide the filters all the way into the filter racks provided. When more than one filter in a filter rack is required, they must butt each
other when you slide them into position.
3.
Replace the filter access panel.
Figure 2: Filter access
A
Filters
B
Indoor coil
C
Filter access pulls
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