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Water Coil 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 1.5 gpm per ton is recommended as
a minimum flow.
Water Coil Maintenance
–
(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 deterioration 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 cleaning 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 can produce water (or debris) velocities that
can erode the heat exchanger wall and ultimately produce
leaks.
Filters –
Filters must be clean to obtain maximum
performance. They should be inspected every month
under normal operating conditions and be replaced when
necessary. Units should never be operated without a filter.
Washable high efficiency electrostatic filters, when dirty,
can exhibit a very high pressure drop for the fan motor
and reduce air flow resulting in poor performance. With
ICM2 fan motors, excessive fan watts will be used as
well. It is especially important to provide consistent
washing of these filters (in opposite direction of the
normal air flow) once per month using a high
pressure
wash similar to that found at self-serve car washes.
Condensate Drain –
In areas where airborne bacteria
produce a slime in the drain pan, it may be necessary to
treat chemically with an algaecide every three months or
so to minimize the problem. The condensate pan may
also need to be cleaned periodically to assure indoor air
quality. The condensate drain can pick up lint and dirt,
especially with dirty filters. Inspect the drain twice a year
to avoid the possibility of overflow.
Fan Motors
- All units have lubricated fan motors. FAN
MOTORS SHOULD NEVER BE LUBRICATED UNLESS
OBVIOUS, DRY OPERATION IS SUSPECTED. Periodic
maintenance oiling is not recommended because it will
result in dirt accumulating on excess oil and cause
eventual motor failure.
Air Coil –
The air coil must be cleaned to obtain maximum
performance. Check once a year under normal operating
conditions and, if dirty, brush or vacuum clean. Care
must be taken not to damage the aluminum fins while
cleaning. CAUTION: Fin edges are sharp.
Hot Water Generator Coils
– See water coil maintenance
for ground water units. If the domestic water is hard or
not chemically softened the high temperatures of the
desuperheater will tend to ‘lime up’ even quicker than the
water coil and may need more frequent inspections.
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 the cabinet is 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 integ-
rity, 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 servicing the refrigerant
circuit.
PREVENTIVE MAINTENANCE
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