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Controls Training and Service Manual
dehumidification process. The end user can choose to select from the following
selections:
Parameter Operation
No
No electric reheat allowed during compressorized
dehumidification operation.
Normal
Electric reheat operates as normal. A decrease in
return air temperature below set point will start
reheats as described previously in his chapter.
Delayed
No low limit reached / low limit reset: heaters
disabled. Only one of two compressors operating in
dehum or low limit 1 reached: heaters enabled
Normal or Delayed Reheat (2-Stage Dehumidification Only)
When normal reheat (factory default) control is selected, the unit reheats are not
disabled during dehumidification, even if both compressors are operating. As the
return air temperature decreases below the temperature set point the reheats will
stage on and off as described earlier in this chapter.
If delayed reheat is selected and both compressors are operating for
dehumidification control, the reheats are disabled until only one compressor is
required. If, during reheat disable, the return air temperature decreases far
enough below the temperature set point to require 150% total available reheat
capacity, then dehumidification is disabled and reheats are activated.
When the return temperature raises to the point where reheat is no longer
required, then dehumidification operation is re-enabled. However, if the amount of
time that both compressors were operating prior to being disabled by the low
temperature condition was less than 10 minutes, then only one compressor is
allowed to operate for subsequent dehumidification requirements. This prevents
excessive system cycling, which can occur if the room heat load is small. Once
the requirement for dehumidification is no longer present, then both compressors
are enabled.
Caution:
Dehumidification with normal reheat allows for operating both compressors and
reheats simultaneously. It is very important that the electrical service to the unit be
sized and wired for this option if selected. If not sized properly the electrical
service could experience nuisance trips and or possible damage to building circuit
breakers (or Fuses) and wiring.
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