24
•
Never open the system while under a vacuum. Should the system require
opening to repair a leak or other service when in a vacuum, fill with dry
nitrogen to atmospheric pressure before opening.
•
Have a Schrader core replacement tool available when servicing the
refrigeration system. Although rare, defective or damaged Schrader valve
cores can contribute to refrigerant loss.
•
Charge systems only by weight after servicing. Review the rating plate and
any field charge labels.
•
When servicing, additional liquid line filter dryers and suction filters may be
required.
•
Charge refrigerant blends, including R-410A and R-407C, with liquid only.
Charging should be done into the high side of the system whenever possible.
Refer to section 5.4 for addition procedures related to charging.
Note that the superheat should be stable and within 4 degrees of fluctuation. Minimum
value for superheat at compressor in all modes:
30.0 - 40.0
40.1 - 50.0
50.1 - 60.0
60.1 - 70.0
70.1 - 80.0
40.0 - 45.0
12
13
13
14
14
Superheat Minimum Values Chart Temp (°F)
45.1 - 50.0
13
14
14
15
15
50.1 - 55.0
14
15
15
15
16
60.1 - 65.0
15
16
18
18
19
55.1 - 60.0
15
15
16
16
18
65.1 - 70.0
16
18
18
19
20
Relative
Ai
r
Humidity (%RH)
Relative Air
Temperature (°F)
Figure 14 - Superheat Minimum Values Chart
3.4
General Testing
After you balance the airflow and test the refrigeration circuits, verify that the other
equipment and accessories connected to the dehumidifier work properly. Although this
may be difficult, since the dehumidifier is usually interlocked with a variety of
equipment installed by different contractors, you must not skip this step.
Each of these devices (which may include auxiliary air and water heaters, smoke
alarms, circulating pumps, and a building managements system) is vital in maintaining
the performance of the unit. Many customer complaints are caused by improper
interlocks between these devices. Make sure you check the following:
•
Check the outdoor air and exhaust devices. The outdoor air and exhaust
dampers must open when they receive an “occupied” signal from the
dehumidifier. If you have installed an exhaust blower, make sure that it is
interlocked with the “occupied” signal or with an end switch on the outdoor air
damper actuator.
Desert Aire - LW Manual
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