Installation and operation manual
33
RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV System Air Conditioner
4P329765-1 – 2012.09
14.4. Method for adding refrigerant
14.4.1. Flow chart
Step 1
• Calculate additional refrigerant
charge amount: R (kg) (see
"14.3. Calculating the
additional refrigerant charge"
on page 32
)
Refrigerant overcharge happened
• Recover refrigerant to reach
R=Q
• Go to step 4a
Step 2+3
• Open valve C to field piping via
liquid stop valve
• Execute pre-charging amount:
Q (kg)
• Close valve C if no additional
refrigerant can be charged
Step 4a
• Close valve C
• Charging is finished
• Fill in the amount on the
additional refrigerant charge
label
• Go to test run (see
"15.5. Test
operation" on page 44
)
R<Q
R=Q
R>Q
You want to execute automatic
refrigerant charge?
B
A
Step 4b+5
Manual refrigerant charging
method (in cooling operation)
NO
YES
Step 4b+5
Automatic refrigerant charging
method
Step 6B
Activate field setting [2-20]=1
Unit will start manual refrigerant
charging operation.
Step 6A
• Push 1x BS2: "
888
"
• Push BS2 for more than 5
seconds "
t01
" pressure
equalisation
Step 6B
• Open valve A
• Charge remaining amount of
refrigerant P (kg)
R=Q+P
Depending on ambient conditions,
the unit will decide to perform
autocharge operation in heating
or cooling mode.
Step 6B
• Close valve A
• Push BS3 to stop manual
charging
• Charging is finished
• Fill in the amount on the
additional refrigerant charge
label
• Go to test run (see
"15.5. Test
operation" on page 44
)
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