HI-E DRY 195 Installation, Operation & Service Instructions - Page 4

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1. Troubleshooting

3 Operation

3.1 Humidity Control Adjustment

The dehumidifier will run continuously until the relative

humidity (RH) is reduced to the humidity control dial

setting. Setting the humidity control to lower RH levels

will NOT increase the unit's dehumidification rate, it

will simply run longer to reduce the area's RH to the

setting. The HI-E Dry 95 unit (and refrigerant based

dehumidifiers in general) will reduce a warm space's RH

to a lower level than that of a cool space. It is therefore

pointless to set the humidity control to excessively low

levels in cool rooms. Doing so will result in long periods

of ineffective dehumidifier run time.

A quality humidity meter is recommended to accurately

monitor humidity levels. For a quote on a quality humidity

meter, call the factory.

3.2 Fan Switch

Turning the fan switch ON will cause the unit's

internal blower to run continuously, whether the unit is

dehumidifying or not. This function is desirable if the unit

is used for air circulation or fresh air ventilation.

3.3 Defrost Control Adjustment

When the HI-E Dry 95 is used in a cool area, frost will

form on the cooling coil as it dehumidifies. When enough

frost forms, the defrost thermostat will initiate the

timed defrost cycle. The cycle periodically turns off the

compressor while allowing the blower to run. The air that

the blower draws through the cooling coil melts the frost.

The defrost cycle is automatic and designed for optimum

performance above 50°F. If the unit is used in an area

that is below 50°F for more than 2 hours, adjustment

of the defrost timer is recommended to improve

performance.

To adjust the defrost timer:

. Unplug the unit.

2. Remove the front cover (6 screws).

3. The timer is fastened to the base panel. Every fourth

peg around the dial is pushed out from the dial

center except one section with 5 pegs out in a row.

See figure . Each fourth "out" peg represents 5

minutes of compressor "off" time during every hour

that the unit is in the defrost cycle.

4. To improve performance below 50°F, the compressor

"off" time must be increased to 30 minutes per hour

to allow the frost to completely melt. To do this, push

the pegs out from the dial center so that the pegs

alternate with 2 toward the center, then 2 out from

the center, all the way around the dial except for the

section now with 6 pegs out in a row (see Fig. ).

5. Replace the front cover.

Toll-Free -800-

Figure 2: Defrost Control Timer

Change the timer pegs back to the original pattern for

use above 50°F.

3.4 Low Pressure Control

If the low side refrigerant pressure drops to 5 PSIG, the

low pressure control opens and shuts off the compressor

and blower. It is an automatically reset control that will

close when the pressure rises to 35 PSIG. Its primary

function is to prevent damage to the compressor if a leak

develops in the refrigeration system. It may also open if

the unit is A) used in a cool area (below 50°F) and the

defrost timer is not adjusted (see Sec. 3.3) or B) stored

where it is below 40°F and then started. Under these

conditions, the unit will restart within several minutes.

Until the unit warms up, it may cycle several times.

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