REYQ8~16P8Y1B
VRVIII System air conditioner
4PW39996-1A
Installation manual
17
1
Procedure for additional refrigerant charge
The automatic refrigerant charging has limits as described
below.
At out of limit, the system can not operate the automatic
refrigerant charging.
Pre-charging
To speed up the process 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 8
.
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 and the high pressure/low pressure gas 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 and high pressure/low
pressure gas pipe stop valves and the service port stop
valve. (Valves A, B and C must be closed.)
-
Close all front panels except the electric component 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 16
-
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 19
.
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
Refrigerant charge port
5
High pressure/low pressure gas pipe stop valve
6
Suction gas pipe stop valve
7
Liquid pipe stop valve
8
Valve A
9
Valve B
10
Valve C
11
Outdoor unit
12
To BS unit, indoor unit
13
Stop valve
14
Service port
15
Field piping
16
Refrigerant flow when pre-charging through the liquid stop valve
service port (refer to step
)
17
Refrigerant flow when automatic charging through the charge port
(refer to step
)
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
When the leak detection function is not required,
complete charging when using the previous described
method (unit is not operating) can be done.
If it is not possible to charge the entire quantity through
the service port of the liquid pipe stop valve with the
unit not operating, refer to
.
NOTE
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.
During the automatic charging operation, you can
force the operation to a halt by pushing the
button.
■
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 indoor units with
power ON, refer to
many units are connected" on page 16
■
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 calculated
amount (see
"6.6. Example of connection" on
), therefore, the weight must be monitored
constantly.
BS1 MODE
BS1 MODE
BS4 TEST
BS4 TEST
Summary of Contents for VRVIII REYQ-P8
Page 32: ...4PW39996 1A Copyright Daikin...
