Maintenance
Preventive Maintenance
Maintenance on the unit is simplified with the following preventive sugges- tions:
Filter maintenance must be performed to assure proper operation of the equipment. Filters should be inspect- ed at least every three months, and re- placed when it is evident they are dirty. Filter sizing includes:
Model WPVJ | Filter Size (nominal) |
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018, 024 | 16 x 20 |
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20 x 25 | |
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20 x 30 | |
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Model WPHF | Filter Size (nominal) |
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16 x 24 | |
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(1) 16 x 16 (1) 16 x 20 | |
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18 x 20 | |
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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- 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-
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 experi- enced service person.
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 6.
Table 6: Water Quality Table
Scaling
Calcium and magnesium | Less than 350 ppm | |
(total hardness) | ||
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Corrosion |
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pH | ||
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Hydrogen Sulfide | Less than 1 ppm | |
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Sulfates | Less than 25 ppm | |
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Chlorides | Less than 125 ppm | |
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Carbon Dioxide | Less than 75 ppm | |
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Total dissolved solids | Less than 1000 ppm | |
(TDS) | ||
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Biological Growth |
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Iron Bacteria | Low | |
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Erosion |
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Suspended Solids | Low | |
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31 |
