Daikin RZQG71L9V1, Service Manual

Page: 91 / 215

ESIE15-13C Field Setting from Remote Controller
Field Setting 77
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
Parameters
Relative
Humidity
(%)
Setting is only allowed in this area
Indoor side temperature DB (˚C)
Factory setting Low humidity application
setting Low humidity appli
freeze up operation
prevention
Field Setting 16(26)-2-01 16(26)-2-03 16(26)-2-04
Compressor control

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 Minimum target Te = 0°C 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 1 See graph 2 See graph 3
Freeze protection
function
Start Te ≤ -1°C for 40 minutes
accumulated
OR
Te
≤
A°C for 1 minute
continuous
(Indoor decision)
Te ≤ -1°C for 40 minutes
accumulated
OR
Te
≤
-3°C for 1 minute
continuous
(Outdoor decision)
Te ≤ -1°C for 40 minutes
accumulated
OR
Te
≤
A°C for 1 minute
continuous
(Outdoor decision)
End Te > 7°C for 10 minutes
continuously.
(Indoor decision)
Te > 7°C for 3 minutes
continuously
OR
Te > 4°C for 20 minutes
continuously
(Outdoor decision)
Te > 7°C for 3 minutes
continuously
OR
Te > 4°C for 20 minutes
continuously
(Outdoor decision)
FCQG FHQG
A
-5°C -3°C