Preventive Maintenance - Heat Controller HTV Series Installation, Operation & Maintenance Instructions Manual

Preventive Maintenance

Water Coil Maintenance
(Direct ground water applications only)
If the system is installed in an area with a
known high mineral content (125 P.P.M. or
greater) in the water, it is best to establish a
periodic maintenance schedule with the
owner 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 the heat exchanger material and 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.
Minimum flow rate for entering water
temperatures below 50°F is 2.0 gpm per ton.
Water Coil Maintenance
(Water 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, it is best to establish a
periodic maintenance schedule with the
owner so the water coil can be checked
regularly. Dirty installations are typically the
result of deterioration of iron or galvanized
piping or components in the system.
Water Flow
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.
HTV/HTD/HTH SERIES
PREVENTIVE MAINTENANCE
40
Hot Water Generator Coils
See water coil maintenance for ground water
units. If the potable water is hard or not
chemically softened, the high temperatures of
the desuperheater will tend to scale even
quicker than the water coil and may need
more frequent inspections. In areas with
extremely hard water, a HWG is not
recommended.
Filters
Filters must be clean to obtain maximum
performance. Filters 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. It is
especially important to provide consistent
washing of these filters (in the opposite
direction of the normal air flow) once per
month using a high pressure wash similar to
those found at self-serve car washes.
Condensate Drain
In areas where airborne bacteria may
produce a "slimy" substance in the drain pan,
it may be necessary to treat the drain pan
chemically with an algaecide approximately
every three months to minimize the problem.
43
Heat Controller, Inc.