52
G e o t h e r m a l H e a t i n g a n d Co o l i n g
Trilogy
®
Variable
(VE) Series IOM - 60Hz HFC-410A
R e v i s i o n D a t e : 2 2 D e c e m b e r, 2 0 2 1
Preventive Maintenance
Water Coil Maintenance
(All other 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. 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
(3.9 l/m per kW) may 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. 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. The condensate pan
may also need to be cleaned periodically to insure 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 plugging and eventual overflow.
Fan Motors
All residential units have permanently lubricated fan motors.
Further lubrication is not recommended.
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.
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 [7 - 8 cm] to prevent water from entering the cabinet.
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 charts for pressures and temperatures. Verify
that air and water flow rates are at proper levels before
servicing the refrigerant circuit.