Daikin LREN8A7Y1B, Installer And User Manual

Page: 132 / 156

20 | Commissioning
Installer and user reference guide
132
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
Parameter Range Root cause when
out of range
Countermeasure
Suction superheat
(refrigeration) ≥10 K Incorrect selection
of expansion valve
at refrigeration
side. Set the correct target super
heat (SH) value of
showcase or blower coil.
Suction
temperature
(refrigeration) ≤18°C Lack of amount of
refrigerant. Charge additional
refrigerant
(a)
.
Incorrect selection
of expansion valve
at refrigeration
side. Set the correct target super
heat (SH) value of
showcase or blower coil.
(a)
Charge additional refrigerant until all parameters are within their range. See "17 Charging
refrigerant" [
4
116].
Check operation parameters
Action Push button 7-segment display
Check that the 7-segment
display is OFF. This is the
initial condition after the
communication has been
confirmed.
To return to the initial
state of the 7-segment
display, push BS1 once, or
leave the unit as is for at
least 2 hours.
—
Push BS1 once and shift
to the parameter
indication mode.
BS1 BS2 BS3
MODEMODE MODE MODE
The indication will
change:
Push BS2 a number of
times, depending on the
indication you want to
confirm:
▪ Suction superheat
(refrigeration): 21 times
▪ Suction temperature
(refrigeration): 9 times
To return to the initial
state, for example if you
pushed a wrong number
of times, push BS1 once.
BS1 BS2 BS3
MODEMODE MODE MODE
The last 2 digits indicate
the number of times you
pushed. For example, you
want to confirm suction
superheat:
Push BS3 once, to access
the value of each of the
selected parameters.
BS1 BS2 BS3
MODEMODE MODE MODE
For example, 7-segment
displays 12 if suction
superheat is 12.