Installation manual
19
REMQ8~16P7Y1B
VRVIII System air conditioner
4PW37156-1
1
Adding refrigerant using leak detection function
The automatic refrigerant charging has limits as described
below.
At out of limit, the system can not operate the automatic
refrigerant charging.
To speed up the proces of charging refrigerant for large systems, it is
recommended to first manually charge a portion of the refrigerant
first before performing automatic charging.
1
Calculate how much refrigerant to be added using the formula
explained in the chapter
"How to calculate the additional
refrigerant to be charged" on page 10
2
The amount of pre-charging is 10 kg less than the calculated
amount.
3
Open valve B (the valves A and C, the liquid pipe, the suction
gas pipe, the high pressure/low pressure gas pipe and the
equalizer pipe stop valves must be left closed) and charge the
refrigerant in liquid form via the liquid pipe stop valve service
port.
4
If the calculated amount of pre-charging is reached, close
valve B.
5
After pre-charging, perform the refrigerant charge operation as
shown below and charge the remaining refrigerant of the
additional charging amount through valve A.
1.
Start of automatic charging refrigerant
-
Open the liquid pipe, suction gas pipe, high pressure/low
pressure gas pipe and equalizer pipe stop valves and the
service port stop valve. (Valves A, B and C must be closed.)
-
Close all front panels except the electric box front panel and
turn the power ON.
-
Make sure all indoor units are connected, refer to
to check how many units are connected" on page 18
-
If the H2P LED is not flashing (in 12 minutes time after
turning on the power), make sure it is displayed as shown in
the
"2 Normal system display" on page 21
.
If the H2P LED is flashing, check the malfunction code on the
remote controller
"3 Remote controller malfunction code
2.
Press the
button once if the LEDs combination is not
as in the figure below.
3.
Press the
button once.
4.
Hold the
button down for 5 seconds or more.
5.
Charging mode judgement
However, if the indoor temperature is 10°C DB or lower, in some
cases the unit will charge in heating mode to increase the indoor
temperature.
The unit will automatically select the cooling mode or heating
mode for charging.
Outdoor temperature
: 0°C DB~43°C DB
Indoor temperature
: 10°C DB~32°C DB
Total indoor unit capacity
:
≥
80%
1
Measuring instrument
2
Refrigerant tank (R410A, siphon system)
3
Charge hose
4
Equalizer pipe stop valve
5
High pressure/low pressure gas pipe stop valve
6
Suction gas pipe stop valve
7
Liquid pipe stop valve
8
Refrigerant charge port
9
Valve A
10
Valve B
11
Valve C
12
To BS-unit, indoor unit
13
Stop valve
14
Service port
15
Field piping
16
Refrigerant flow when charging
17
The refrigerant will be charged with ±30 kg in 1 hour at an outdoor
temperature of 30°C DB (12 kg at 0°C DB). If you need to speed
up in case of a multi system, connect the refrigerant tank to each
outdoor unit.
At least the unit should be charged with its original amount
of refrigerant (refer to the nameplate on the unit), before
starting the automatic charging.
NOTE
For a multi outdoor unit system, it is not required
to connect all charge ports to a refrigerant tank.
The refrigerant will be charged with ±30 kg in
1 hour time at an outdoor temperature of 30°C DB
or with ±12 kg at an outdoor temperature of
0°C DB.
If you need to speed up in case of a multiple
outdoor system, connect the refrigerant tanks to
each outdoor unit as shown in
■
If you perform the refrigerant charging operation
within the refrigerant system with one or more
units with power OFF, the refrigerant charging
operation can not be accomplished properly.
For confirming the number of outdoor units and
indoor units with power ON, refer to
check how many units are connected" on
page 18
In case of a multi system, turn the power ON to
all outdoor units in the refrigerant system.
■
To energize the crankcase heater, make sure to
turn the power ON at least 6
hours before
starting operation.
H1P
H2P
H3P
H4P
H5P
H6P
H7P
x
x w x
x
x
x
H1P
H2P
H3P
H4P
H5P
H6P
H7P
w w w w w w w
■
When charging in cooling mode, the unit will stop
operating when the required amount of
refrigerant is charged.
■
During charging in heating mode, a person must
manually close valve A before complete charging
is finished. The required amount is the the
calculated amount (see
), therefore, the weight
must be monitored constantly.
BS1 MODE
BS4 TEST
BS4 TEST
