American Aldes DHV-150H Manuale Utente

 

9

 

 

 

 
The DHV-150H is equipped with a pleated cloth air 
filter. This filter should be checked semi-annually. 
Operating the unit with a dirty filter will reduce 
dehumidifier capacity and efficiency and may cause 
the compressor to cycle off and on unnecessarily on 
the defrost control. 
 
To access the air filter, remove the filter access panel 
from the end of the DHV-150H by unscrewing the two 
thumbscrews and sliding the panel to the left until it is 
free from underneath the side panel. The filter(s) 
should be readily visible and can be removed by 
pulling them straight out of the DHV-150H. 
 
The pleated cloth 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 standard filter or with a less effective 
filter than the standard filter. The heat exchange coils 
inside the unit could become clogged and require 
disassembly to clean.  
 

 

 
An optional high efficiency pleated microglass paper 
filter is available for the DHV-150H. This filter is rated 
as 90%-95% efficient by the ASHRAE Dust Spot test 
method 52-76. The high efficiency pleated microglass 
paper filter should be used in conjunction with the 
standard filter, and placed directly behind the standard 
filter. 
 
This filter is able to remove allergy-causing particles 
from the airstream. Check the high efficiency air filter 
every two years and replace if necessary. The high 
efficiency filter has a much larger surface area than 
the standard filter, thus the standard filter may need to 
be cleaned or replaced several times before the high 
efficiency filter requires replacement. Be careful not to 
damage the fabric media when handling the high 
efficiency pleated paper filter. Do not attempt to clean 
the high efficiency pleated paper filter. It should be 
replaced when it becomes restrictive (See Figure 7). 
 

 

 
Check and clean the screen on the outdoor fresh air 
return seasonally. The screen may become plugged 
during the seasons when there are many particles in 
the outdoor air. 

 

 

CAUTION: Servicing the DHV-150H 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. 

 

 

 
Warranty terms are provided at the end of this manual. 
Please read the terms before any repair is initiated. If 
a warranty repair is required, call the factory first at 1-
800-255-7749 for warranty claim authorization and 
technical assistance. 
 

 

 
The DHV-150H 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 
(See Figure 3). 
 

 

 

Figure 3: Refrigeration System of DHV-150H 

 
Hot, high-pressure refrigerant gas is routed from the 
compressor to the condenser coil (See Figure 3). 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 causes 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