17
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Charging refrigerant
Installer and user reference guide
120
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
Type of indoor unit
Total amount of
refrigerant (kg)
Blower coils
(e)
Showcases
(f)
Subtotal (e)+(f):
[2]
Required amount of refrigerant for outdoor unit (kg):
18.4 kg
18.4[3]
Subtotal [1]+[2]+[3] (kg)
[4]
Additional amount of refrigerant charged when test
run if required (kg)
[5]
Total amount of refrigerant [4]+[5] (kg)
(a)
[6]
(a)
The maximum amount of additional refrigerant that can be charged at the time of the test
run is 10% of the amount of refrigerant as calculated from the capacity of connected
indoor units. Use [5]≤[2]×0.1 to calculate this maximum amount.
Conversion ratio for indoor units: refrigeration
Type
Conversion ratio (kg/kW)
Low temperature
Medium temperature
Blower coil
0.059
Showcase
0.441
0.294
17.5 To charge refrigerant
1
Turn OFF the operation switch of the outdoor unit.
2
Turn ON the power supply of the outdoor unit and all indoor units (blower
coils, showcases).
3
Charge refrigerant from the service port SP7 in front of the stop valve (i) on
the refrigeration liquid side. Keep the stop valve closed. See
4
When charging is finished, open all stop valves.
5
Attach the valve caps to the stop valves and service ports.
Pressure difference too low
If the pressure difference between the charging cylinder and refrigerant piping is
too low, you cannot charge anymore. Continue as follows to decrease the pressure
in the piping and to be able to continue charging:
1
Open the gas stop valve (h).
2
Adjust the opening of the liquid stop valve (i).
3
Turn ON the operation switch of the outdoor unit. The pressure in the
refrigerant piping will drop, and charging can be continued.
NOTICE
In case of long field piping length, the outdoor unit automatically stops when
charging refrigerant with the liquid stop valve fully closed. Adjusting the liquid stop
valve avoids an unwanted stop.