19
GEO16-501.4
MAINTENANCE
CAUTION
Do not attempt to reuse any mechanical or electrical
component which has been wet. Such component must be
replaced.
IMPORTANT
To check most of the Possible Remedies in the troubleshooting
guide listed in Tables 22.1 - 24.1, refer to the applicable
sections of the manual.
WARNING
When servicing or repairing this equipment, use only factory-
approved service replacement parts. A complete replacement
parts list may be obtained by contacting Modine Manufacturing
Company. Refer to the rating plate on the appliance for
complete appliance model number, serial number, and
company address. Any substitution of parts or controls not
approved by the factory will be at the owner’s risk.
MAINTENANCE
The routine care and maintenance of this unit will increase
longevity, provide for the proper operational performance, and
reduce the probability of failure.
Once the unit is operational, it will be necessary to perform
certain routine maintenance/service checks. Following is a
Maintenance Schedule with the recommended checks. If your
unit is equipped with special features, there may be additional
checks that are required. Consult Modine for assistance.
The use of torque screwdrivers on panel, cover or component
mounting screws is not recommended. Hand-start all screws.
If electric drills are used – set at the lowest possible torque.
Coaxial Coil Maintenance – Ground Water
Applications
If the system is installed in an area with a known high mineral
content (125 P.P.M. or greater), best practice is to establish a
periodic maintenance schedule with the owner so the coil can
be checked on a regular basis. Should periodic coil cleaning
be necessary, use coil cleaning procedures that are compatible
with the heat exchanger material and copper water lines.
Generally, with greater water flow rates, the likelihood of scaling
reduces. Therefore, the recommended minimum water flow is
1.5 gpm per ton. Recommended minimum flow rate for entering
water temperatures below 50°F is 2.0 gpm per ton.
Keep all air out of the water. An open loop system should be
checked to ensure that the well head is not allowing air to
infiltrate the water line. Lines should always be airtight. Keep
the system under pressure at all times. It is recommended in
open loop systems that the water control valve be placed in
the discharge line to prevent loss of pressure during off cycles.
Closed loop systems must have positive static pressure.
Coaxial Coil Maintenance – Ground Loop
Applications
Generally water coil maintenance is not needed for closed
loop systems. However, if the piping is known to have high
dirt or debris content, best practice is to establish a periodic
maintenance schedule with the owner so the coil can be
checked on a regular basis. Dirty installations are typically the
result of deterioration of iron or galvanized piping or components
in the system.
Open cooling towers requiring heavy chemical treatment and
mineral buildup through water use can also contribute to higher
maintenance. Should periodic coil cleaning be necessary, use
standard coil cleaning procedures that are compatible with the
heat exchanger material and copper water lines.
Generally, with greater water flow rates, the likelihood of scaling
reduces. 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.
Desuperheater Coils
If potable water is hard or not chemically softened, the high
temperature of the desuperheater can lead to scaling. This
results in more scheduled maintenance. A buffer tank may be
installed to help prevent scaling. Extreme hard water conditions
should not use the desuperheater option. Should periodic coil
cleaning be necessary, use coil cleaning procedures that are
compatible with the heat exchanger material and copper water
lines.
Air Filters
Filters must be clean to obtain maximum performance. They
should be inspected monthly under normal operating conditions
and be replaced when necessary. Units should never be
operated without a filter.
Condensate Drain
In areas where airborne bacteria produce slime in the drain
pan, it may be necessary to treat chemically with an algaecide
approximately every three months to minimize the problem. It
may be necessary to clean the condensate pan periodically to
insure indoor air quality. The condensate drain can pick up lint
and dirt, especially with dirty filters. Inspect twice a year to avoid
the possibility of overflow.
Compressor
Conduct annual amperage checks to insure that amp draw is no
more than 10% greater than indicated on the operating data.
Blower Motors
All units have lubricated fan motors. Do not lubricate unless
obvious, dry operation is inspected. Periodic oiling is not
required (may lead to excessive dirt buildup & motor failure).
Check the operation amperage annually to ensure the amp draw
is not greater than 10% of data indicated on the name plate.
ECM fan motors need NO oiling.
