Trane WPWD - Manual (Page 25)

WSHP-SVX02A-EN 25
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-
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-
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 experi-
enced service person.
Maintenance
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
Scaling
Calcium and magnesium
(total hardness)
Less than 350 ppm
Corrosion
pH 7-9.5
Hydrogen Sulfide Less than 1 ppm
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