Maintenance on the unit is simplified with the following preventive suggestions: Filter maintenance must be performed to assure proper operation of the equipment. Filters should be inspected at least every three months, and replaced when it is evident they are dirty. Filter sizing is shown in Table 8, p. 31:
Check the contactors and relays within the control panel at least once a year. It is good practice to check the tightness of the various wiring connections within the control panel.
A strainer (60 mesh or greater) must be used on an open loop system to keep debris from entering the unit heat exchanger and to ensure a clean system.
For units on well water, it is important to check the cleanliness of the water-to-refrigerant heat exchanger. Should it become contaminated with dirt and scaling as a result of bad water, the heat exchanger will have to be back flushed and cleaned with a chemical that will remove the scale. This service should be performed by an experienced service person.
It should be noted that the water quality should be checked periodically. See Table 9, p. 31.
Filter Replacement (standard height configuration)
Filter replacement is done at the front return-air opening of the console unit. No tools are required for the replacement.
The maintenance process is done via a 3- STEP process:
Filter Replacement (low height configuration)
Filter replacement is done at the front return-air opening of the console unit. A slotted screw driver is needed for the replacement.
The maintenance process is done via a 2- STEP process.
Source: MaintainX (Community Member)