32
Maintenance
(See back of the manual for maintenance
log.)
At least once each year, a qualified service
technician must inspect the unit. Inspect
supply fans, evaporator coils and air filters
monthly.
Periodically during operation, it is necessary
to perform routine service checks on the
performance of the unit. This includes
checking of the air flow, the air filters,
cooling water flow and refrigerant charge.
See Startup section for information on air
flow adjustment and refrigerant charge
adjustment.
DX Cooling
Set unit controls to cooling mode of operation
with supply fans on. Check the fans for
correct operating direction, amperage and
voltage.
Condensate Drain Pans
Drain pans will have moisture present and
require periodic cleaning to prevent
microbial growth. Cleaning of the drain pans
will also prevent any possible plugging of the
drain lines and overflow of the pan itself.
Cleaning of the drain pans and inside of the
unit must be done only by qualified
personnel.
Winterizing Coils
In some cases it may be necessary to
winterize water coils to prevent them from
freezing.
First completely drain the coils. There is a
drain located below the ‘water in’ connection
and a vent connection located above the
‘water out’ connection. Auxiliary drain
piping can also be added to exterior water
piping if yearly winterizing is necessary.
After the coil is drained, fill with an
antifreeze solution using a circulating pump.
Then thoroughly drain.
Supply Fans
Improper installation, adjustment,
alteration, service or maintenance can
cause property damage, personal
injury or loss of life. Installation and
service must be performed by a
qualified installer. A copy of this IOM
must be kept with the unit.
Blower wheels must be inspected for
excessive dust build up periodically
and cleaned if required. Excessive
dust build up on blower wheels may
cause an unbalanced state; leading to
vibration and/or component failure.
Damages due to excessive dust build
up will not be covered under factory
warranty.
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