Bedienungsanleitung Midea RSJ-35 - 300RDN3 (Seite 19 von 22) (Englisch)

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Installation & Owner’s Manual

7. MAINTENANCE

Check the connection between power supply plug and socket

and ground wiring regularly;

In some cold area (below 0℃), if the system will be stopped for

a long time, all the water should be released in case of freezing

of inner tank and damage of E-heater.

It is recommended to clean the inner tank and E-heater every

half year to keep an efficient performance.

Check the anode every half year and change if required. For

more details, please contact the supplier or the after-sale

service.

It is recommended to set a lower temperature to decrease the

heat release, prevent scale and save energy if the outlet water

volume is sufficient.

Clean the air filter every month in case of any inefficiency on the

heating performance.

In terms of the filter set in air inlet directly (namely, air inlet

without connect with canvas), the method of dismantle the filter

is: anti-clockwise unscrew the air inlet ring, take out the filter

and clean it completely, finally, remount it to the unit.

Before shutting the system off for a long time, please:

Shut off the power supply;

Release all the water in water tank and the pipeline and close

all the valves;

Check the inner components regularly.

How to change the anode;

Turn off the power, and turn off the water inlet valve.

Open hot water tap, and decrease the pressure of the inner

container.

7.1 Maintenance

High discharge temperature protection

Tp>110℃,Protection active

Tp<90℃，Protection inactive

It is normal, and no necessary to repair.

7.2 Recommended regular maintenance table

Open the drain port, and release the water, until there are no water

flow out.

Unscrew anode according to instruction.

Replace with a new one, and make sure effective sealed.

Open cold water valve untill water flows out from outlet tap,

then turn of water outlet tap.

Power on then restart the unit.

Checkin

Item

Checkin

conten

Checking frequency Action

air filte

(inlet/outle

)

every month Clean the filte

2 anode every half year

Replace it if it h

been used ou

3 inner tank every half year Clean the tan

E-heater every half year Clean E-heater

Operate the

hander of PTR

valve to ensure

that waterways

are clear.

PTR valve

If water doesn't flow freely when operating the

hander, replace PTR valve with a new one

every year

Table.7-1

Fig.7-1

anode

For the bad mining area environment and poor water quality, it

must periodic do the following works base on the actual

situations: check the magnesium bar to see whether it has been

consumed; clean the sundries in the filter screen to prevent

blocking the air inlet; clean the filter screen.

Compressor abnormally stopped protection.The discharge

temperature is not so higher than evaporator temperature

after compressor running a term.

Compressor overloaded protection (10 secs after compres-

sor startup, current checking starts, 1) only compressor

running, if it is >10A , the compressor will be stopped and

protected. 2) Compressor+E-heater running, if it is

>IEH+10,the compressor will be stopped and protected.)

When the ambient temp T4 is out of Heat Pump running

range (-7～43℃) Heat Pump will stop, unit will show LA on

the position of clock on display until T4 back to (-7～43℃).

Only valid for the unit without E-heater.Unit with E-heater

will never show "LA".

System blocked, air or water or less

refrigerant(leakage) in system( after repair), water temperature

sensor malfunction, ect. Contact a qualified person to service the unit.

Compressor broken or bad connection between PCB and

compressor.Contact a qualified person to service the unit.

Maybe because of compressor broken, system blocked, air or water

or more refrigerant in system(after repair),water temperature sensor

malfunction, ect. Contact a qualified person to service the unit.

The diagnostic codes listed above are the most common. If a

diagnostic code not listed above is displayed, contact residen-

tial technical assistance referenceing the number on the front

of this manual.

If any of P3/P4/P2/P1 continuously appear 3 times within single

heating cycle, system will consider it as “Heat Pump system error”. The

third failure code and will be shown on the display, then heat pump

will stop running,and the unit will shift automatically to E-heater as the

backup heat source,but the third failure code and will be shown until

power is reset.Contact a qualified person to service the unit.

NOTE

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