1-13
1.4.3 Dehumidification Mode (Option)
The dehumidification operation lowers humidity
using the reheater that heats the air cooled by the
evaporator.
Heat source of the reheater, like the defrosting
operation, uses high temperature refrigerant (hot
gas) discharged from the compressor.
This control is optional, and available for only the
unit equipped with a reheat coil.
The unit equipped with a reheat coil is set to "ON"
at factory referring to ＊12 Configuration Setting in
paragraph 2.3.
●Setting for dehumidification operation
To execute dehumidification operation, selecting
the dehumidification operation set to "ON", "ON-A",
or "Bulb" is necessary.
ON: When dehumidification operation is executed
ONｰA ： When dehumidification operation is
executed for the unit without humidity
sensor
Bulb: When dehumidification operation is executed
in the Bulb mode
OFF: When dehumidification operation is not
executed
●Display
After completion of
setting, "DEHUMID" is
indicated on right.
●Dehumidification Operation
Dehumidification operation starts when the
following conditions are met during modulated
cooling in the chilled mode.
RH＞Setting humidity RH
& SS＜SP±0.7℃ with 5 min. elapse
or SS＞SP-0.7℃ with 5 min. elapse
When dehumidification operation starts, it supplies
hot gas to the reheater. EFM runs at high speed.
Modulated Cooling in Chilled
Dehumidification Control
RH＞Setting humidity RH
& SS＜SP±0.7℃
with 5 min. elapse
or SS＞SP-0.7℃
with 5 min. elapse
RH＜Setting humidity RH-7%
with 3 min. elapse
or SS＞SP+0.5℃
with 20 min. elapse
or SS＜SP-0.5℃
with 20 min. elapse
●Cancellation of Dehumidification operation
1) Set dehumidification operation to "OFF"
2) 48 hours elapse after power OFF
3) F-PTI completed
4) Chilled PTI completed
5) Frozen PTI completed
CFM
RSVHSV
DMV
Valve chamber
Economizer
Reheat coil (option)
Condenser
Receiver
HPT
HPS
EMV
ESV
LSV
Drier
EEV
LPT
Sight glass
Evaporator
EFM
PRV
RETURN 2.0C
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