Daikin RYYQ8T7Y1B, Installation And Operation Manual

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Installation and operation manual
35
RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV System Air Conditioner
4P329765-1 – 2012.09
14.4.2. Charging method
As explained during vacuum drying method, once vacuum drying is
finished, additional refrigerant charging can start.
There are two methods to charge additional refrigerant. Use the
selected method following the described procedure below.
 Adding refrigerant by using the automatic refrigerant charging
function.
See
"A. Adding refrigerant by using the automatic charging
function" on page 36 . This method uses an automated method
for charging refrigerant.

Adding refrigerant by using the manual refrigerant charging
function.
See
"B. Adding refrigerant by using the manual charging
function" on page 37 . This method uses a manual method for
charging refrigerant.
A flow chart is available which gives an overview of the possibilities
and actions to be taken (see
"14.4.1. Flow chart" on page 33 ).
To speed up the process of pre-charging refrigerant for large
systems, it is recommended to first charge a portion of the refrigerant
before performing automatic or manual charging. This step is
included in below procedure. This step can be skipped, charging will
take longer in such a case.
Follow the steps as described below and take into account whether
you want to use the automatic charge function or not.
1 Calculate the additional amount of refrigerant to be added using
the formula mentioned in
"14.3. Calculating the additional
refrigerant charge" on page 32 .
2 The first 10 kg of additional refrigerant can be charged without
outdoor unit operation.
If the additional refrigerant amount is smaller than 10 kg,
perform the pre-charging procedure as explained in step 3 and
4a below.
If the additional refrigerant charge is larger than 10 kg, perform
step 3 till the end of the procedure.
3 Pre-charging can be done without compressor running by
connecting the refrigerant bottle only to the liquid stop valve
service port (open valve C). Make sure that the stop valves are
closed (valve A and B+liquid line stop valve+gas line stop
valve+equalizer line stop valve).
Location of valves
1 Pressure reducing valve
2 Nitrogen
3 Measuring instrument
4 Refrigerant R410A tank (siphon system)
5 Vacuum pump
6 Charge hose
7 Refrigerant charge port
8 Gas line stop valve
9 Liquid line stop valve
10 Outdoor unit
11 To indoor unit
12 Stop valve
13 Field piping
14 Gas flow
15 Stop valve service port
16 Equalizing line (only for RYMQ)
A Valve A
B Valve B
C Valve C
4 a) If the calculated additional refrigerant amount is reached by
above pre-charging procedure, close valve C.
b) If the total amount of refrigerant could not be charged by pre-
charging, then close valve C and go to step 5. Follow step 6
depending on the chosen charging method.
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.
Open the liquid and gas side stop valves. Valves A, B and C
must remain closed!
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 multiple outdoor 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 not operate before the
communication is established in a correct way
between outdoor unit(s) and indoor units.

Before starting charging procedures, check if the
segment display indication of the outdoor unit A1P
PCB is as normal (see
"Functions of the push button
switches which are located on the outdoor PCB
(A1P)" on page 30
). If a malfunction code is present,
see "15.6. Malfunction code list" on page 45 .

Make sure all connected indoor units are recognised
(see
"15.2. Monitoring function and field settings" on
page 38 ).

Close the front panel before any refrigerant charge
operation is executed. Without the front panel
attached the unit cannot judge correctly whether it is
operating properly or not.
NOTICE
In case of maintenance and the system (outdoor unit+field
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.
INFORMATION
Adding refrigerant using the automatic refrigerant charging
function is not possible when Hydrobox units or RA DX
indoor units are connected to the system.
INFORMATION
If the total additional refrigerant amount was reached in
step 4 (by pre-charging only), 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 "15.5. Test
operation" on page 44.
1
2 3
4
5
6
B
C
9
8
10 10 10
11
13
12
14
16 15
A 7