Preventative Maintenance - Carrier 50YER036 Installation, Operation And Maintenance Instructions

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 [2.0 l/m per
kW] is recommended as a minimum flow. Minimum flow
rate for entering water temperatures below 50°F [10°C] is 2.0
gpm per ton [2.6 l/m per kW].
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. 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,
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.
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.
Compressors
Conduct annual amperage checks to ensure amp draw is
no more than 10% greater than that indicated by serial plate
data.
W a t e r- t o - W a t e r ( 5 0 Y E R ) S e r i e s - P u r o n

Preventative Maintenance

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 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 servicing
the refrigerant circuit.
If the refrigerant circuit is opened for any reason, a new liquid
line filter-drier must be installed.
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