4 Maintenance
4.1 Air Filter
The HI-E Dry 100 is equipped with two 2” thick, MERV-11
pleated fabric air filters that must be checked regularly.
Operating the unit with dirty filters will reduce the
dehumidifier’s capacity and efficiency and may cause
the compressor to cycle off and on unnecessarily on the
defrost control.
The filter can generally be vacuumed clean several times
before needing replacement. Replacement filters can be
ordered from the factory or purchased locally if available.
DO NOT operate the unit without the filter or with a less
effective filter as the heat exchange coils inside the unit
could become clogged and require disassembly to clean.
5 Service
CAUTION: Servicing the HI-E Dry 100 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.
5.1 Warranty
A warranty certificate has been enclosed with this unit.
Read it before any repair is initiated. If a warranty repair
is required, call the factory first at 1-800-533-7533 for
warranty claim authorization and technical assistance.
5.2 Technical Description
Refer to Figure 3. The HI-E Dry 100 uses a refrigeration
system similar to an air conditioner’s to remove heat and
moisture from incoming air, and add heat to the air that
is discharged.
Hot, high-pressure refrigerant gas is routed from the
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 two capillary tubes, 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 it should always be full of 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
accumulator after leaving the evaporator coil. The
accumulator prevents any liquid refrigerant from reaching
the compressor. The compressor evacuates the cool
refrigerant gas from the accumulator and compresses
it to a high pressure and temperature to repeat the
process.
5.3 Troubleshooting
No dehumidification, neither blower nor compressor run
with fan switch OFF.
1. Unit unplugged or no power to outlet.
2. Humidity control set too high or defective (Sec. 3.1 &
5.9)
3. Loose connection in internal wiring.
Some dehumidification, blower runs continuously but
compressor only runs sporadically with fan switch OFF.
1. Unit is in defrost cycle (Sec. 3.3 & 5.10).
2. Defrost thermostat defective or loose
(Sec. 3.3 & 5.10).
3. Loose connection in compressor circuit
(see Fig. 4).
4. Defective compressor overload (Sec. 5.6A).
5. Defective compressor (Sec. 5.6).
6. Defective relay (Sec. 5.8).
7. Defective defrost timer (Sec. 5.10).
No dehumidification. Blower runs but compressor does
not with fan switch OFF.
1. Bad connection in compressor circuit (Fig. 4).
2. Defective compressor capacitor (Sec. 5.6A).
3. Defective compressor overload (Sec. 5.6A).
4. Defective compressor (Sec. 5.6).
5. Defective relay (Sec. 5.8).
6. Defective defrost timer (Sec. 5.10).
7. Bad connection in pump circuit (Fig. 4).
8. Pump float switch or safety switch open (Sec. 5.11).
9. Pump motor defective (Sec. 5.11).
Figure 3: Refrigeration system of HI-E Dry 100
4
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Toll-Free 1-800-533-7533
www.sylvane.com 1-800-934-9194
