Specifications

ManualsBrandsDaikin ManualsAir ConditionerRXYQQ20T7Y1B

Installation and operation manual

RXYQQ8~20T7Y1B

VRV IV System Air Conditioner

4P345099-1 – 2013.04

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 35. 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 36. 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 32).

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 31.

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

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 29). If a malfunction code is present,

see "15.5. Malfunction code list" on page 44.

 Make sure all connected indoor units are recognised

(see "15.2. Monitoring function and field settings" on

page 37).

 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

piping+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

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 "15.4. Test

operation" on page 43.

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