16 Configuration
Installation and operation manual
34
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452190-1D – 2020.10
[1‑17] [1‑18] [1‑19]
Shows:
▪ [1‑17]: The latest malfunction code.
▪ [1‑18]: The 2nd last malfunction code.
▪ [1‑19]: The 3rd last malfunction code.
16.1.8
Mode 2: Field settings
[2‑8]
T
e
target temperature during cooling operation without variable
refrigerant temperature (VRT) control.
[2‑8]
T
e
target (°C)
1
3°C
2 (default)
6°C
3
7°C
4
8°C
5
9°C
6
10°C
7
11°C
[2‑9]
T
c
target temperature during heating operation without variable
refrigerant temperature (VRT) control.
[2‑9]
T
c
target (°C)
1
41°C
2
42°C
3
43°C
4
44°C
5
45°C
6 (default)
46°C
7
49°C
[2‑20]
Manual additional refrigerant charge.
[2‑20]
Description
0 (default)
Deactivated.
1
Activated.
To stop the manual additional refrigerant
charge operation (when the required additional
refrigerant amount is charged), push BS3. If
this function was not aborted by pushing BS3,
the unit will stop its operation after 30 minutes.
If 30 minutes was not sufficient to add the
needed refrigerant amount, the function can be
reactivated by changing the field setting again.
[2‑23]
Variable refrigerant temperature (VRT) control
[2‑23]
VRT control
0 (default)
Activated both cooling and heating
1
Activated heating only
2
Activated cooling only
3
Deactivated
[2‑24]
Water pump/valve control.
To activate the variable flow system, change the setting to the
applicable value.
[2‑24]
Water pump control
1
Each unit has a pump/valve
[2‑24]
Water pump control
2
Water pump/valve control is OFF or 1 pump/
valve per system
3
Each unit has a pump/valve (pump is OFF
when slave unit does not operate)
Minimum water flow rate limit control.
To change the minimum water flow rate limit of the variable flow
system, change the setting to the applicable value. The flow rate
limit is according to the table.
[2‑25]
Minimum water flow rate limit (%)
0
10%
1
20%
2
30%
3
40%
4 (default)
50%
5
60%
6
70%
7
80%
[2‑50]
Brine type setting.
By changing this setting, you can extend the operation range at the
brine side of the unit.
▪ Normal operation range at brine side (default): for use with water
as heat source medium.
▪ Extended operation range at brine side: for use with brine as heat
source medium.
NOTICE
By changing this setting to extended operation type, glycol
must be used as heat source medium to avoid freeze up of
the brine circuit or unit itself (cf. operation range). Do not
use water in this case!
[2‑50]
Description
0 (default)
No brine: water. Extended range impossible.
11
Use brine: Ethylene Glycol (20%) or Propylene
Glycol (20%). Extended range possible.
4
Use brine: Ethylene Glycol (30%) or Propylene
Glycol (30%). Extended range possible.
6
Use brine: Ethylene Glycol (40%) or Propylene
Glycol (40%). Extended range possible.
[2‑73]
Zero energy dissipation control setting.
[2‑73]
Description
0 (default)
OFF
1
ON (with priority on cooling capacity)
2
ON (with priority on zero energy dissipation)
Zero energy dissipation control can be OFF if the mechanical room
is already equipped with a ventilation system or air conditioning
system for other facilities.
[2‑74]
Zero energy dissipation setting temperature.
If the unit internal temperature is higher than the zero energy
dissipation setting temperature, the zero energy dissipation control
will start and cool down the unit.
[2‑74]
Description
0
25°C
1
27°C
