Daikin RXYQ26PY1 Installation Manual download pdf (Page 20)

15 English

(Refer to figure 27)

1. Electrical box

2. Cover of electrical box

3. Cover for servicing

4. Inspection cover

5. Points to be noted when providing services

〈Cautions for check operation〉

• If operated within about 12 minutes after power supply has been

applied to the indoor unit and outside unit, H2P will turn ON but

the compressor does not start running. Before start operation,

make sure that the LED display is correct referring to the table (6)

of “11-3 Check operation”.

• The system may require up to 10 minutes until it can start the

compressor after an operation start. This is a normal operation to

equalize the refrigerant distribution.

• The check operation does not provide any means of checking the

indoor units individually. For that purpose, perform normal opera-

tion using the remote controller after the check operation.

• Check operation is not possible in other modes such as collection

mode.

• If the setting of indoor remote controller is changed before the

check operation, it may not be performed correctly and malfunc-

tion code “UF” may be displayed.

Remote controller displays malfunction code

11-4 Check of normal operation

After the check operation is completed, operate the unit normally.

(Heating is not possible if the outdoor temperature is 24°C or higher.

Refer to the Operation manual.)

Check the below items.

• Make sure the indoor and outside units are operating normally

(If a knocking sound can be heard in the liquid compression of

the compressor, stop the unit immediately and then energize

the heater for a sufficient length of time before restarting the

operation.)

• Run each indoor unit one at a time and make sure the corre-

sponding outside unit is also running.

• Check if cold (or hot) air is coming out of the indoor unit.

• Press the fan direction and fan strength buttons on the indoor

unit to check if they operate properly.

Caution

〈Cautions for normal operation check〉

• Once stopping, the compressor will not restart in about 5 min-

utes even if the Run/Stop button of an indoor unit in the same

system is pressed.

• When the system operation is stopped by the remote control-

ler, the outside units may continue operating for further 5 min-

utes at maximum.

• If the system has not undergone any check operation by the

test operation button since it was first installed, an malfunction

code “U3” is displayed. In this case, perform check operation

referring to “11-3 Check operation”.

• After the test run, when handing the unit over to the customer,

make sure the EL. COMPO. BOX cover, the inspection door,

and the unit casing are all attached.

(7)

•

Using the push button switches (BS1 -

5) on the P-panel (A1P) of outside unit,

carry out a local setting, if necessary.

•

In case of an installation of multiple

outside units, carry out the setting on

the master unit.

(Setting on the slave unit becomes

invalid.)

Always carry out the setting

only after the

power supply has been applied

For the method of setting, refer to the label of

“

Points to be noted when providing ser-

vices

” attached to the cover of electrical box

(shown in the figure 27) of the outside unit.

(After setting, record the details of that setting

to the label of “Points to be noted when pro-

viding services” without fail.)

(8)Check all shutoff valve is opened.

If some shutoff valve is closed, open them.

(Refer to “

9-10 Shutoff valve operation

procedure

”.)

[CAUTION]

Do not leave any shutoff valve closed.

Otherwise the compressor will fail.

For Heat recovery system of cooling and

heating:

Open all stop valves on the suction side,

discharge gas side and liquid side.

For cooling and heating switching operation

system:

Open the stop valves on discharge gas side

and liquid side.

(Keep the stop valve on

suction side fully closed.)

(9)Perform the check operation following the

instructions printed on the [Service

Precautions] label.

If you push the test run button (BS4) on the

P-panel (A1P) of the outside unit.

for 5 seconds, the test run starts.

If you want to interrupt the test run, push the

RETURN button (BS3) on P-panel (A1P) of

the outside unit. The system continues resid-

ual operation for about 1 minute (maximum

10 minutes) and then stops.

(During test run, you cannot stop it by a com-

mand from a remote controller.)

You need to perform the above settings

on the PCB by accessing the PCB through

the inspection cover on the switch box

cover.

Malfunc-

tion code

Installation error Remedial action

The shutoff valve of an

outside unit is left

closed.

Open the shutoff valve.

The phases of the

power to the outside

units are reversed.

Exchange two of the three

phases (L1, L2, L3) to make a

positive phase connection.

The check operation

is not completed.

Complete the check operation.

No power is supplied to

an outdoor or indoor

unit (including phase

interruption).

Check if the power wiring for the

outside units are connected cor-

rectly.

(If the power wire is not con-

nected to L2 phase, no malfunc-

tion display will appear and the

compressor will not work.)

Incorrect transmission

between units

Check if the refrigerant piping line

and the unit transmission wiring

are consistent with each other.

Refrigerant overcharge

Recalculate the required amount

of refrigerant from the piping

length and correct the refrigerant

charge level by recovering any

excessive refrigerant with a

refrigerant recovery machine.

Insufficient refrigerant

• Check if the additional refrig-

erant charge has been fin-

ished correctly.

• Recalculate the required

amount of refrigerant from the

piping length and add an ade-

quate amount of refrigerant.

If an outdoor multi ter-

minal is connected

when there is one out-

side unit installed

Remove the line from the outdoor

multi terminals (Q1 and Q2).

The operation mode on

the remote controller

was changed before

the check operation.

Set the operation mode on all

indoor unit remote controllers to

“cooling.”

The heat source water

is not circulating.

Make sure that the water pump

is running.

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Daikin RXYQ26PY1 Installation Manual Page 20

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