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INFORMATION
National implementation of EU regulation on certain
fluorinated greenhouse gases may require to provide the
appropriate official national language on the unit.
Therefore,
an
additional
greenhouse gases label is supplied with the unit.
Sticking instructions are illustrated on the backside of that
label.
16.3. Calculating the additional refrigerant charge
NOTICE
The refrigerant charge of the system must be less than
100 kg. This means that in case the calculated total
refrigerant charge is equal to or more than 95 kg, you must
divide your multi outdoor unit system into smaller
independent systems, each containing less than 95 kg
refrigerant charge. For factory charge, refer to the unit
nameplate.
16.3.1
How to calculate the additional refrigerant to be charged
Additional refrigerant to be charged = R (kg). R should be rounded off
in units of 0.1 kg.
R= [(X
x Ø22.2) x 0.37 + (X
x Ø19.1) x 0.26 + (X
1
2
(X
x Ø12.7) x 0.12 + (X
x Ø9.5) x 0.059 + (X
4
5
X
= Total length (m) of liquid piping size at Øa
1...6
A parameter (kg)
Heat pump system
8~10 HP
16~20 HP
4.5 kg
24~30 HP
When using metric piping, please take into account following table
concerning the weight factor to be allocated. It should be substituted
in the formula for R.
Inch piping size
(Ø) (mm)
Weight factor
6.4
0.022
9.52
0.059
12.7
0.12
15.9
0.18
19.1
0.26
22.2
0.37
When selecting indoor units, the connection ratio (CR) has to be kept
within limitations: 50%≤CR≤130%.
More detailed information can be found in the technical engineering
data.
16.4. Method for adding refrigerant
Be sure to charge the specified amount of refrigerant in liquid state.
Since this refrigerant is a mixed refrigerant, adding it in gas form may
cause the refrigerant composition to change, preventing normal
operation.
1.
Before charging, check whether the refrigerant cylinder is
equipped with a siphon tube or not.
Charge the liquid
refrigerant with the
cylinder in upright
position.
2.
Be sure to use tools exclusively for R410A to ensure required
pressure resistance and to prevent foreign materials from mixing
into the system.
Installation and operation manual
32
multilingual
fluorinated
x Ø15.9) x 0.18 +
3
x Ø6.4) x 0.022] + A
6
Heat recovery system
3 kg
4 kg
6.5 kg
6 kg
9 kg
Metric piping
size (Ø) (mm)
Weight factor
6
0.018
10
0.065
12
0.097
15
0.16
16
0.18
18
0.24
22
0.35
Charge the liquid
refrigerant with the
cylinder in upside-down
position.
NOTICE
Charging with an unsuitable substance may cause
explosions and accidents, so always make sure that the
appropriate refrigerant (R410A) is charged. Refrigerant
containers must be opened slowly.
CAUTION
When charging a system, charging over the
permissible quantity can cause liquid hammer.
Always use protective gloves and protect your eyes
when charging refrigerant.
When the refrigerant charging procedure is done or
when pausing, close the valve of the refrigerant tank
immediately. If the tank is left with the valve open, the
amount of refrigerant which is properly charged may
get off point. More refrigerant may be charged by any
remaining pressure after the unit has stopped.
NOTICE
If the power of some units is turned off, the charging
procedure cannot be finished properly.
In case of a multi outdoor unit system, turn on the
power of all outdoor units.
Make sure to turn ON the power 6 hours before
starting the operation. This is necessary to warm the
crankcase by the electric heater.
If operation is performed within 12 minutes after the
indoor and outdoor units are turned on, the
compressor
will
communication is established in a correct way
between outdoor unit(s) and indoor units.
Before starting charging procedures, check if the LED
indication on the outdoor unit A1P PCB is as normal
(see
"15.2. Operating the push buttons and DIP
switches on the logic board" on page
malfunction code is present, see
code list" on page
Make sure all connected indoor units are recognised
(see
"17.2. Monitoring function and field settings" on
page
34).
NOTICE
In case of maintenance and the system (outdoor unit+field
piping+indoor units) does not contain any refrigerant any
more (e.g., after refrigerant reclaim operation), the unit has
to be charged with its original amount of refrigerant (refer
to the nameplate on the unit) by pre-charging before the
automatic charging function can be started.
A. Additional refrigerant charge procedure by normal way
3.
After the vacuming drying is finished, charge the additional
refrigerant in liquid state through the stop valve service port.
Check if gas and liquid stop valves are closed.
If the total amount can not be charged, follow the additional
refrigerant charge procedure (B) shown below.
Heat pump system (2-pipe)
3
1
A
R410A
B
4
2
C
5
not
operate
before
29). If a
"18.2. Malfunction
41.
7
7
8
9
12
13
6
15
RWEYQ8+10T7Y1B
VRV-W IV System Air Conditioner
4P347465-1A – 2013.04
the
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