28
Water Cooled Package
Installation
Maintenance
- Preventive Maintenance
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.
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.
- Hazardous Chemicals
Coil cleaning agents can be either acidic or highly alkaline. Handle chemical carefully. Proper handling
should include goggles or face shield, chemical resistant gloves, boots, apron or suit as required. For
personal safety, refer to the cleaning agent manufacturers Materials Safety Data Sheet and follow all
recommended safe handling practices. Failure to follow all safety instructions could result in death or serious
injury. It should be noted that the water quality should be checked periodically. See the following water
quality table.
Scaling
Calcium and magnesium(total hardness)
Less than 350 ppm
pH
7 ~ 9.5
Hydrogen Sulfide
Less than 1 ppm
Corrosion
Sulfates
Less than 25 ppm
Chlorides
Less than 125 ppm
Carbon Dioxide
Less than 75 ppm
Total dissolved solids(TDS)
Less than 1000 ppm
Biological Growth
Iron Bacteria
Low
Erosion
Suspended Solids
Low
Cooling
Heating
Air
64.4~89.6
50~69.8
Water
59~104
59~104
Operating range
(unit : Fahrenheit, °F)
Summary of Contents for AKWW0093AA0
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