Installation manual
17
RXYQ8~18P7W1BR1
VRVIII System air conditioner
4PW44039-1E – 07.2010
11.4. Additional refrigerant charge
Use the described procedure below to charge the refrigerant.
1
Adding refrigerant
■
Charge with the outdoor unit at standstill
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 9
2.
Open valve C (valves A and B and the stop valves must be left
closed) and charge the required amount of refrigerant through
the liquid side stop valve service port.
■
When the required amount of refrigerant is fully charged,
close valve C. Record the amount of refrigerant that was
added on the additional refrigerant charge label provided with
the unit and attach it on the back side of the front panel.
Perform the test procedure as described in
refrigerant was added (pre-charging, charging in heating
mode)" on page 23
.
■
When the additional charging is not complete, perform the
procedure explained in the chapter
■
When charging a system, charging over the allowable
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.
Electric shock warning
■
Close the electric box lid before turning on the main
power.
■
Perform the settings on the circuit board (A1P) of the
outdoor unit and check the LED display after the
power is on via the service lid which is in the lid of the
electric box.
Operate switches with an insulated
stick (such as a ball-point pen) to
avoid touching the life parts.
Make sure to re-attach the
inspection cover into the switch box cover after the job
is finished.
■
If the power of some units is turned off, the charging
procedure can not be finished properly.
■
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 H2P-LED
will be lit and the compressor will not operate.
NOTE
■
See
"11.3. Stop valve operation procedure" on
for details on how to handle stop valves.
■
The refrigerant charging port is connected to the
piping inside the unit.
The unit's internal piping is already factory
charged with refrigerant, so be careful when
connecting the charge hose.
■
After adding the refrigerant, do not forget to close
the lid of the refrigerant charging port.
The tightening torque for the lid is 11.5 to
13.9 N•m.
■
In order to ensure uniform refrigerant distribution,
it may take the compressor ±10 minutes to start
up after the unit has started operation. This is not
a malfunction.
1
Measuring instrument
2
Tank (siphon system)
3
Charge hose
4
Liquid line stop valve
5
Gas line stop valve
6
Stop valve service port
7
Valve B
8
Valve C
9
Valve A
10
Outdoor unit
11
Refrigerant charge port
12
To indoor unit
13
Interunit piping
14
Refrigerant flow
