Setting For Low Humidity Application - Daikin RZQG71~140L7V1B Service Manual

Field Setting from Remote Controller
2.7

Setting for Low Humidity Application

Purpose
Can be set when using the RZQG units for year round cooling in low humidity applications such
as computer rooms (EDP rooms), technical rooms, etc...to increase the capacity of the unit.
Definition of Low
Humidity Area
Caution
When using the "LH settings" outside the "Low Humidity Area" there is an increased risk of ice
accumulation on the indoor coil or water blowing out from the indoor unit.
Function details
Field Setting
Compressor control
Freeze protection Start
function
End
Parameters
138
Relative
Humidity
(%)
Factory setting
16(26)-2-01
 The compressor frequency is controlled in function of the target evaporating temperature.
 The target evaporating temperature is controlled in function of the cooling load.
Minimum target Te = 2°C
See graph 1
Te -1°C for 40 minutes
accumulated
OR
Te  A°C for 1 minute
continuous
(Indoor decision)
Te > 7°C for 10 minutes
continuously.
(Indoor decision)
A
Setting is only allowed in this area
Indoor side temperature DB (˚C)
Low humidity application
setting
16(26)-2-03
Minimum target Te = 0°C
See graph 2
Te  -1°C for 40 minutes
accumulated
OR
Te  -3°C for 1 minute
continuous
(Outdoor decision)
Te > 7°C for 3 minutes
continuously
OR
Te > 4°C for 20 minutes
continuously
(Outdoor decision)
FCQG
-5°C
ESIE12-06
Low humidity application +
freeze up operation
prevention
16(26)-2-04
Initial minimum target Te =
2°C, but can be changed in
function of actual Te, to avoid
freeze up activation:
 Te  -1°C for 20 minutes
accumulated => Change
target Te  5°C
 Te  -1°C for 30 minutes
accumulated => Change
target Te  8°C
See graph 3
Te  -1°C for 40 minutes
accumulated
OR
Te  A°C for 1 minute
continuous
(Outdoor decision)
Te > 7°C for 3 minutes
continuously
OR
Te > 4°C for 20 minutes
continuously
(Outdoor decision)
FHQG
-3°C
Field Setting