Hour Meter; Hours Button; Defrost Light; Maintenance - Jon-Don R340 Owner's Manual

3.8 Hour Meter

The digital hour meter displays the amount of time the
dehumidifier has been operating to the tenth of an hour. The
hour meter continuously cycles between total machine hours
and job hours every 3 seconds. Hours are stored in memory
even when the unit is unplugged. The previous totals will be
displayed next time the unit is powered on.

3.9 HOURS Button

Pressing the HOURS button displays the hour meter when the
unit is turned off but plugged into power. To reset job hours,
press and hold the HOURS button for 5 seconds when the
unit is operating.

3.10 Defrost Light

The DEFROST light turns on when the unit is in defrost cycle
and indicates when the compressor is off.

4 Maintenance

4.1 Air Filter

The R340 is equipped with a pleated media air filter that
must be checked regularly. The standard filter is a MERV-11
high efficiency filter. Operating the unit with a dirty filter will
reduce the dehumidifier's capacity and efficiency and may
force the unit into defrost causing the compressor to cycle
"off" and "on" unnecessarily. The filter can generally be
vacuumed clean several times before needing replacement.
Replacement filters can be ordered from Jon-Don.
IMPORTANT: DO NOT operate the unit without the filter
or with a less effective filter as the heat exchanger and
coils inside the unit could become clogged and require
disassembly to clean.

4.2 Storage

There are two issues to consider when the R340 is stored
between uses and both pertain to the water trapped in
the unit: damage caused by freezing or biological growth.
The effect of the trapped water can be greatly reduced if
precautions are taken to remove as much as possible before
storage.
1. Use the pump PURGE button to reduce the water level in
the reservoir
2. Walk out the hose to drain it completely
In order to reduce biological growth flush the unit with a
biofungicide that is approved for use with copper, aluminum,
polyethylene and ABS. To flush:
1. Run the hose to a drain
2. Plug in the unit but do not turn it on
3. Remove the air filter. Slowly pour a pint of the chemical
Toll-Free 1-800-556-6366
through the top so that it drains into the heat exchanger
4. Use PURGE button to remove chemicals in reservoir. Run
PURGE until hose runs dry
5. Walk out hose to drain completely
6. Replace air filter

5 Service

WARNING: Servicing the R340 with its high pressure
refrigerant system and high voltage circuitry presents a
health hazard which could result in death, serious bodily
injury, and/or property damage. Only qualified service
people should service this unit.
CAUTION: Do not operate unit without the front housing in
place.

5.1 Technical Description

The R340 uses a refrigeration system similar to an air
conditioner's to remove heat and moisture from incoming air
and to add heat to the air that is discharged.
Hot, high pressure refrigerant gas is routed from the
Figure 5: Refrigeration system
compressor to the condenser coil. The refrigerant is cooled
and condensed by giving up its heat to the air that is about
to be discharged from the unit. The refrigerant liquid then
passes through a filter/drier and capillary tubing which cause
the refrigerant pressure and temperature to drop. It next
enters the evaporator coil where it absorbs heat from the
incoming air and evaporates.
The evaporator operates in a flooded condition, which means
that all the evaporator tubes contain liquid refrigerant during
normal operation. A flooded evaporator should maintain
constant pressure and temperature across the entire coil,
from inlet to outlet.
The mixture of gas and liquid refrigerant enter the
4
www.jondon.com