Maintenance
Preventive Maintenance
Maintenance on the unit is simplified with the following preventive sugges- tions:
WARNING
Hazardous
Voltage!
Disconnect all electric power, in- cluding remote disconnects be- fore servicing. Follow proper lockout/tagout procedures to en- sure the power can not be inad- vertently energized. Failure to disconnect power before servic- ing could result in death or seri- ous injury.
Check the contactors and relays within the control panel at least once a year. It is good practice to check the tight-
WARNING
Hazardous
Chemicals!
Coil cleaning agents can be either acidic or highly alkaline. Handle chemical carefully. Proper han- dling should include goggles or face shield, chemical resistant gloves, boots, apron or suit as re- quired. For personal safety, refer to the cleaning agent manufactur- ers Materials Safety Data Sheet and follow all recommended safe handling practices. Failure to fol- low all safety instructions could result in death or serious injury.
It should be noted that the water qual- ity should be checked periodically. See Table 9.
Table 9: Water Quality Table
ness 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 sys- tem.
For units on well water, it is important to check the cleanliness of the water-
Scaling
Calcium and magnesium (total hardness)
Corrosion
pH
Hydrogen Sulfide
Sulfates
Chlorides
Carbon Dioxide
Total dissolved solids (TDS)
Biological Growth
Iron Bacteria
Erosion
Less than 350 ppm
Less than 1 ppm Less than 25 ppm Less than 125 ppm Less than 75 ppm
Less than 1000 ppm
Low
should be performed by an experi- enced service person.
Suspended Solids | Low |
25 |
