Comfort-Aire HWW120 - Manual (Page 30)

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Preventative Maintenance
Heat Exchanger Maintenance –
(Direct Ground Water Applications Only)
If the installation is performed in an area with a known high
mineral content (125 P.P.M. or greater) in the water, it is best
to establish with the owner a periodic maintenance schedule
so the coil can be checked regularly. Consult the well water
applications section of this manual for a more detailed water
coil material selection. Should periodic coil cleaning be
necessary, use standard coil cleaning procedures which are
compatible with either the heat exchanger material or copper
water lines. Generally, the more water flowing through the
unit the less chance for scaling therefore 2.5 gpm per ton
[2.0 l/m per kW] is recommended as a minimum flow.
Heat Exchanger Maintenance –
(All Other Water Loop Applications)
Generally water coil maintenance is not needed however,
if the installation is located in a system with a known high
dirt or debris content, it is best to establish with the owner a
periodic maintenance schedule so the coil can be checked
regularly. These dirty installations are a result of the dete-
rioration of iron or galvanized piping or components in the
system or open cooling towers requiring heavy chemical
treatment and mineral buildup through water use. Should
periodic coil cleaning be necessary, use standard coil clean-
ing procedures which are compatible with both the heat
exchanger material and copper water lines. Generally, the
more water flowing through the unit, the less chance for
scaling, however flow rates over 3 gpm per ton [3.9 l/m per
kW] can produce water (or debris) velocities that can erode
the heat exchanger wall and ultimately produce leaks.
Clean or replace 20 mesh (841 micron) [0.84mm] strainer/
filters on a timely schedule.
Compressors
Conduct annual amperage checks to ensure amp draw is
no more than 10% greater than that indicated by serial plate
data.
Cabinet
Do not allow water to stay in contact with the cabinet for long
periods of time to prevent corrosion of the cabinet sheet
metal. Generally vertical cabinets are set up from the floor a
few inches for prevention. The cabinet can be cleaned using
a mild detergent.
Refrigerant System
To maintain sealed circuit integrity, do not install service
gauges unless unit operation appears abnormal. Reference
the operating chart for pressure and temperatures. Verify
that air and water flow rates are at proper levels before ser-
vicing the refrigerant circuit.
If the refrigerant circuit is opened for any reason, a new
liquid line filter-drier must be installed.
Installation & Operation WATER-TO-WATER (HWW) SERIES Heat Controller, Inc.