Pridiom POM273HX, POM365HX, POM182HX Service Manual

CONTENTS

1. General information of Outdoor Units................................................................................................... 3

2. Dimensions.............................................................................................................................................. 4

3. Wiring Diagram........................................................................................................................................ 5

4. Refrigeration Cycle Diagram.................................................................................................................. 7

5. Indoor units combination ....................................................................................................................... 8

6. Electronic control function..................................................................................................................... 9

7. Troubleshooting.................................................................................................................................... 14

1. General information of Outdoor Units

The hydrophilic fin can improve the heating efficiency at operation mode.

It is only operated in the heating operation mode except defrosting operation.

It protects the valves and prevents water from dripping.

Outdoor unit

Power relay control

Hydrophilic aluminum fin

Anti-rust cabinet

Valve protection cover

4 way valve control

Low noise air flow system

Discharge pipe temperature protection

Compressor crankcase heater

2. Dimensions

a)320+;

b) 320+;

3. Wiring Diagram

3.1 320+;

3.2 320+;

3.3 320+;

4. Refrigeration Cycle Diagram

4.1 Refrigeration circuit drawing of inverter binary type

4.2 Refrigeration circuit drawing of inverter trinary type

4.3 Refrigeration circuit drawing of inverter quadplex type

Liquid valve A

Gas valve C

EXV C

4-way
valve

Compressor

Condense

r

A

xial flow fan

EXV B

EXV A

Gas valve A

Gas valve B

Liquid valve C

Liquid valve B

Evaporato

r

Cross

flow fan

Indoor Unit

Capillary A

Capillary B

Capillary C

Filter A

Filter B

Filter C

Main
Capillary

A

uxiliary

Capillary

Check
Valve

Exhaust
temp. senso

r

Indoor pipe out
temp. sensor B

Indoor pipe ou

t

temp. sensor A

Indoor pipe out
temp. sensor C

Outdoor Unit

Coil temp.
senso

r

Indoor Unit

Cross

flow fan

Evaporato

r

Liquid valve A

Liquid valve B

Gas valve B

Gas valve A

EXVA

EXVB

A

xial

flow fan

Condense

r

Compressor

4-way
valve

A

uxiliary

Capillary

Capillary A

Capillary B

Exhaust
temp. senso

r

Indoor pipe ou

t

temp. sensor A

Indoor pipe out
temp. sensor B

Filter A

Filter B

Outdoor Unit

Main
Capillary

Check
Valve

Coil temp.
senso

r

5. Indoor units combination

5.1 Indoor unit combination for 320+;

One unit Two unit

9 9+9 9+12

12

5.2 Indoor unit combination for 320+;

One unit Two unit Three unit

9 9+9 9+12 9+9+9 9+9+12

12 12+12

5.3 Indoor unit combination for 320+;

One unit Two unit Three unit Four unit

9 9+9 9+12 9+9+9 9+9+12 9+9+9+9 9+9+9+12 9+9+12+12

12 12+12 9+12+12 12+12+12

6. Electronic control function

6.1 Abbreviation

T1: Indoor ambient temperature

T2: Coil temperature of indoor heat exchanger middle.

T2B: Coil temperature of indoor heat exchanger outlet.

T3: Coil temperature of outdoor heat exchanger

T4: Outdoor ambient temperature

T5: Compressor discharge temperature

Ts: Setting temp.

6.2 Electric control working environment.

6.2.1 Input voltage: 230V.

6.2.2 Input power frequency:60Hz.

6.2.3 Indoor fan normal working amp. is less than 1A.

6.2.4 Outdoor fan. Normal working amp. is less than 1.5A.

6.2.5 Four-way valve normal working amp. is less than 1A.

6.2.6 Swing motor: DC12V.

6.3 Outdoor unit’s digital display tube

There is a digital display tube in outdoor PCB.
Digital display tube display function

• In standby , the LED displays “- -”

• In compressor operation, the LED display the running frequency,

• In defrosting mode, The LED displays “dF” or alternative displays between running frequency and

“dF”(each displays 2s)

• In compressor pre-heating, The LED displays “- -”

• In protection or malfunction, the LED displays error code or protection code.

6.4 Outdoor unit point check function

There is a check switch in outdoor PCB.
Push the switch SW1 to check the states of unit when the unit is running. The digital display tube will display

the follow procedure when push SW1 each time.

Display Remark

1

Indoor unit capacity demand code

2

Outdoor unit running mode code Off:0, Cooling:1, Heating:2

3

Amendatory capacity demand code

4

Outdoor unit fan motor state Off:0, Low speed:1, High speed:2

5

Evaporator outlet temp. for 1# indoor unit Actual data

6

Evaporator outlet temp. for 2# indoor unit Actual data

7

Evaporator outlet temp. for 3# indoor unit Actual data

8

Evaporator outlet temp. for 4# indoor unit Actual data

9

Condenser pipe temp. Actual data

10

Ambient temp. Actual data

11

Compressor discharge temp. Actual data

12

Inverter current Actual data

13

EXV open angle for 1# indoor unit Actual data divide 8

14

EXV open angle for 2# indoor unit Actual data divide 8

15

EXV open angle for 3# indoor unit Actual data divide 8

16

EXV open angle for 4# indoor unit Actual data divide 8

17

Power supply of outdoor unit AD data

18 Indoor unit number The indoor unit can communicate with outdoor unit well.

19 The last error or protection code 00 means no malfunction

20

frequency value Actual data

21 Ambient temp. of 1# indoor unit Actual data

22 Condenser pipe temp. of 1# indoor unit Actual data

23

Ambient temp. of 2# indoor unit Actual data

24 Condenser pipe temp. of 2# indoor unit Actual data

25 Ambient temp. of 3# indoor unit Actual data

26

Condenser pipe temp. of 3# indoor unit Actual data

27 Ambient temp. of 4# indoor unit Actual data

28 Condenser pipe temp. of 4# indoor unit Actual data

29

―― Check point over

The following items from 6.4.1 to 6.4.6 are for the explanation of the point check functions.

6.4.1 Frequency of compressor:

Display Frequency of compressor (Hz)

30 30

-- Stand by

60 60

6.4.2 Running mode:

Display Corresponding mode

0 Off

1 Cooling mode

2 Heating mode

6.4.3 Capacity demand:
Cooling mode

Capacity 2000-2

500

2000-2
500

3000-3
800

4500-5
000

5000-5
500

5500-6
100

6100-7
000

7000-7
500

7500-8
000

>7500

Correspondi
ng Code

1 2 3 4 5 6 7 8 9 >=10

Heating mode

Capacity 2000-2

500

2000-2
500

3000-3
800

4500-5
000

5500-6
100

6100-7
000

6100-7
000

7000-7
500

7500-8
000

>8000

Correspondin
g Code

1 2 3 4 5 6 7 8 9-10 >=11

Note:
The capacity is just for reference.

6.4.4Number of indoor unit

Display Number of indoor unit

1 1

2 2

3 3

6.4.5 Outdoor ambient temp:

Display Corresponding temp. Display

Corresponding

temp.

Display

Corresponding

temp.

15 -7.5 50 10 80 25

16 -7 51 10.5 81 25.5

17 -6.5 52 11 82 26

18 -6 53 11.5 83 26.5

19 -5.5 53 11.5 84 27

20 -5 54 12 85 27.5

21 -4.5 55 12.5 86 28

22 -4 56 13 87 28.5

23 -3.5 57 13.5 88 29

24 -3 58 14 89 29.5

26 -2 59 14.5 90 30

27 -1.5 60 15 91 30.5

28 -1 61 15.5 92 31

29 -0.5 62 16 93 31.5

30 0 63 16.5 93 31.5

31 0.5 63 16.5 94 32

32 1 64 17 95 32.5

33 1.5 65 17.5 96 33

34 2 65 17.5 97 33.5

35 2.5 66 18 98 34

36 3 67 18.5 99 34.5

37 3.5 68 19

10.

35~40

38 4 69 19.5

11.

40~45

39 4.5 70 20

12.

45~50

40 5 71 20.5

13.

50~55

41 5.5 72 21

14.

55~60

42 6 73 21.5

15.

60~65

43 6.5 74 22

16.

65~70

44 7 75 22.5

45 7.5 75 22.5

46 8 76 23

47 8.5 77 23.5

48 9 78 24

49 9.5 79 24.5

6.4.6 Opening degree of electronic expansion valve:
Actual opening degree equals the display data divided 8

6.5 Protection

6.5.1 Three minutes delay at restart for compressor.

6.5.2 Temperature protection of compressor discharge.

When the compressor discharge temp. is getting higher, the running frequency will be limited as below rules:

----If 102℃<T5<115 , decrease the freq℃ uency to the lower level every 2 minutes till to F1.

---If T5>115℃ for 10 seconds, the compressor will stop and restart till T5<90℃.

6.5.3 Low voltage protection

VOLLIMT1

VOLTAGE

No li mit

VOLLIMT2

VOLLIMT3

Off

VOLFRE2

VOLFRE1

VOLREL1

VOLREL2

VOLREL3

Model VOLLIMT1 VOLLIMT2 VOLLIMT3 VOLREL1 VOLREL2 VOLREL3 VOLFRE1 VOLFRE2

320+; 230 200 120 260 210 135 62 54
32M3+; 245 220 120 265 240 135 78 45

POM365HX 200 185 120 210 195 135 54 42

Note: if the low voltage protection occurs and not resumes within 3min, it will keep the protection always
after restart the machine.

6.5.4 Compressor current limit protection

If the compressor current exceeds the current limit value for 10 seconds, the compressor frequency will be
limited as below table.

Cooling mode:

Current frequency(Hz) Current limit value(A) Frequency limit

COOL_F10 ICOOLLMT6

COOL_F9 ICOOLLMT5

COOL_F8 ICOOLLMT4

COOL_F7 ICOOLLMT3

COOL_F6 ICOOLLMT2

COOL_F5 ICOOLLMT1

Decrease the frequecny to COOL_F4 and run at
COOL_F4 for 3 minutes.

After that,the frequency will be adjusted according to the
capacity demand and rise to the upper level every 3
minutes

(When the frequency>COOL_F4 via capacity demand).

If the current frequency is lower than COOL_F4, the frequency will not be limited.

After 10s of the compressor start, if the current>ICOOL,the AC will display the failure for 30 seconds and stop. The AC will restart 3
minutes later.

Heating mode:

Current frequency(Hz) Current limit value(A) Frequency limit

HEAT_F12 IHEATLMT8

HEAT_F11 IHEATLMT7

HEAT_F10 IHEATLMT6

HEAT_F9 IHEATLMT5

HEAT_F8 IHEATLMT4

Decrease the frequency to HEAT_F4 and run at HEAT_F4
for 3 minutes.

After that, the frequency will be adjusted according to the
capacity demand and rise to the upper level every 3
minutes

HEAT_F7 IHEATLMT3

HEAT_F6 IHEATLMT2

HEAT_F5 IHEATLMT1

(When the frequency>Heat_F4 via capacity demand).

If the current frequency is lower than HEAT_F4, the frequency will not be limited.

After 10s of the compressor start, if the current>IHEAT,the AC will display the failure for 30 seconds and stop. The AC will restart 3
minutes later.

6.5.5 Indoor / outdoor units communication protection

If the indoor units can not receive the feedback signal from the outdoor units for 2 minutes, the AC will stop
and display the failure.

6.5.6 High condenser coil temp. protection.

When T3>65 for ℃ 3 seconds, the compressor will stop while the indoor fan and outdoor fan will continue.

When T3<52 , the protection will release℃ and the compressor will restart after 3 minutes.

6.5.7 Outdoor unit anti-freezing protection

When T2B<0 for 250 seconds,℃ the indoor unit capacity demand will be zero and resume to normal when
T2B>10 .℃

6.5.8 Oil return
Running rules:

1. If the compressor frequency keeps lower than RECOILINFRE for 2hours,the AC will rise the frequency
to RECOILFRE for 3mins and then resume to former frequency.

Model RECOILINFRE

POM182HX 45

POM273HX 45

POM365HX 40

2. During the oil return process, the EXV and indoor units keep the current running mode, the frequency
will not be limited by the compressor discharge temp. and the current.

6.5.9 Compressor preheating functions

----Preheating permitting condition:

If T4(outdoor ambient temperature)＜3 and ℃ newly powered on or if T4＜3 and compressor has stopped ℃

for over 3 hours, the compressor heating cable will work.

----Preheating mode:

A weak current flow through the coil of compressor from the wiring terminal of compressor, then the

compressor is heated without operation.

----Preheating release condition:

If T4＞5 or ℃ the compressor starts running, preheating function will stop.

6.5.10 Compressor crankcase heater

When T4<3℃ and the compressor is not running,the crankcase heater will be active.
When T4≧5℃ or the compressor starts up,the crankcase heater will stop work.(For M5OA-36HRDN1-Q,T4

≧8℃)

7. Troubleshooting

7.1 Indoor unit error code explanation:

Vertu series:

Display LED STATUS

E0 EEPROM error

E1 Communication error between indoor and outdoor unit

E2 Zero-crossing examination error

E3 Fan speed beyond control

E5 Outdoor units temp. sensor or connector of temp. sensor is defective

E6 Indoor units temp. sensor or connector of temp. sensor is defective

P0 Inverter module protection

P1 Outdoor voltage too low protection

P2 Compressor discharge temp. protection

P3 Outdoor temp. too low protection

P4 Compressor driving protection

7.2

Outdoor unit error code explanation:

Display LED STATUS

E0 EEPROM error

E1 No 1 Indoor units pipe temp. sensor or connector of pipe temp. sensor is defective

E2 No 2 Indoor units pipe temp. sensor or connector of pipe temp. sensor is defective

E3 No 3 Indoor units pipe temp. sensor or connector of pipe temp. sensor is defective

E6 No 4 Indoor units pipe temp. sensor or connector of pipe temp. sensor is defective

E4 Outdoor temp. sensor or connector of temp. sensor is defective

E5 Compressor volt protection

E7 Communication error between outdoor IC and DSP

P0 Compressor discharge temp. protection

P1 High pressure protection (just for 36K 1x4 units.)

P2 Low pressure protection (just for 36K 1x4 units.)

P3 Compressor current protection

P4 Inverter module protection

P5 Outdoor temp. too low protection

P6 Condenser high-temperature protection

P7 Compressor driving protection

PF PFC protection

7.3Trouble shooting

7.3.1 Indoor unit trouble shooting

Indoor unit display LED STATUS

E0 EEPROM error

Indoor unit display LED STATUS

E1 outdoor communication error

Indoor unit display LED STATUS

E2 Zero-crossing examination error

Circuit or software error on indoor PCB

Replace indoor PCB

Disconnect the power supply, after 1 minute,
connect the power supply, turn on the unit with
remote controller

Does the unit work
normally ?

Check the wiring between
indoor and outdoor unit. Is
the connection of L, N, S and
GND good?

Is the GND connection on
outdoor PCB good?

NO

NO

Reconnect and retest again

Is the LED4(red) on
outdoor PCB bright and
LED1(yellow) blinking?

Replace outdoor e-box.

Ye s

Ye s

The power supply for
outdoor PCB is fail. Check
the wiring on outdoor PCB
comparing with wiring plate.
Is the connection good?

No

Correc

t the connection.

Ye s

No

Replace indoor PCB
and repower on. Is

Indoor unit display LED STATUS

E3 Fan speed beyond control

Indoor unit display LED STATUS

E5 Outdoor units temp. sensor or connector of temp. sensor is defective

Indoor unit display LED STATUS

E6 Indoor units temp. sensor or connector of temp. sensor is defective

Is the outdoor temperature
sensor connector and

connection good

?

Repair the connector and

Replace the sensor and
check if E5 dis

play ag

ain?

NO

YES

Replace outdoor e-box

YES

Is the indoor fan motor
connector and connection

good

?

Repair the connector and

Is voltage being applied to
the fan motor?

(rang 90v-160v between
mid pin and N on CN1

NO

YES

Indoor PCB is defective.

YES

Replace the indoor fan

NO

Is power supply and
connection of connectors

good

?

Indoor PCB is defective. Replace
the indoor PCB.

Be sure the power supply is good
and correct the connection

NO

YES

Indoor unit display LED STATUS

P0 Inverter module protection

Indoor unit display LED STATUS

P1 Outdoor voltage protection

Is the power supply good?

Be sure the power supply is

NO

YES

Replace the outdoor e-box.

Revise the power and retest.

Is voltage normal?

NO

YES

Is all connection good?

NO

Revise the power and retest.

YES

Is the wiring to compressor
ri

g

ht?

YES

Check the modular if some
components blow out or be
failure?

YES

Repair or replace the modular.

YES

Is it breakdown between
P-N, P-V, P-W, N-V,N-W or
V-W of inverter moduler?

YES

Replace the modular.

YES

Check the compressor.

Is the indoor temperature
and evaporator sensor
connector and connection
good?

Repair the connector and

Replace the sensor and
check if E6 dis

play ag

ain?

NO

YES

Replace the.indoor PCB

YES

Indoor unit display LED STATUS

P2 Compressor top protection against temperature

Indoor unit display LED STATUS

P3 Compressor current protection

The trouble shooting is same with one of outdoor unit P3 protection.

8.4.1 Outdoor unit trouble shooting

Outdoor unit display LED STATUS

E0 EEPROM error

Outdoor unit display LED STATUS

E1

No 1 Indoor units pipe temp. sensor or connector of pipe temp. sensor is

defective

Circuit or software error on indoor

Replace indoor

YES

Does compressor

Is the connection

g

ood?

Is refrigerant
circulation

NO

NO

Charge refrigerant

Is abnormality
the same after

NO

Check refrigerant system

(such as clogging of cap

illary,

Reconnect and retest.

NO

YES

Is protector
normal?

Replace the protector.

NO

YES

Check the outdoor
main PCB. Is there

Replace the outdoor PCB.

YES

Outdoor unit display LED STATUS

E2

No 2 Indoor units pipe temp. sensor or connector of pipe temp. sensor is

defective

Outdoor unit display LED STATUS

E3

No 3 Indoor units pipe temp. sensor or connector of pipe temp. sensor is

defective

Outdoor unit display LED STATUS

E6

No 4 Indoor units pipe temp. sensor or connector of pipe temp. sensor is

Is connection to connector of pipe temp. sensor good?

Check the resistance of the temp. sensor according to Annex 1

Repair connector

No

Yes

Replace the sensor

Is connection to connector of pipe temp. sensor good?

Check the resistance of the temp. sensor according to Annex 1

Repair connector

No

Yes

Replace the sensor

Is connection to connector of pipe temp. sensor good?

Check the resistance of the temp. sensor according to Annex 1

Repair connector

No

Yes

Replace the sensor

defective

Outdoor unit display LED STATUS

E4 Outdoor units temp. sensor or connector of temp. sensor is defective

Outdoor unit display LED STATUS

E5 Compressor volt protection

Yes

Is connection to connector of pipe temp. sensor good?

Check the resistance of the temp. sensor according to Annex 1

Repair connector

No

Replace the sensor

Is connection to connector of pipe temp. sensor good?

Check the resistance of the temp. sensor according to Annex 1

Repair connector

No

Yes

Replace the sensor

Yes

Check the voltage of power supply, if the voltage is about 220V, turn off the
power supply to indoor unit and turn it on again after 1 minute

Does the trouble occur again?

Check the voltage of secondary of T3 transformer in outdoor power board ,
is this voltage 12-14V(AC)

No

Replace the outdoor power board

Outdoor unit display LED STATUS

E7 outdoor units communication protection

Outdoor unit display

LED STATUS

P0 Compressor top protection against temperature

Is the LED in outdoor main PCB light?

1.Is the +5 voltage in outdoor main board?

Power Board: CN4, Red wire and yellow (GND)

Outdoor main PCB: CZ1

2.Is the +3.3v voltage in outdoor main board?

Power Board: CN1, Purple wire and yellow (GND)

Inverter module defective.

Rectifier circuit is bad connection or
defective when the voltage in outdoor is
abnormal .

D and N: 310V(DC);

No

Yes

No

Yes

Check the signal wires between outdoor

PCBs, is it connected good.

Check the IC6, IC7 (at Outdoor power PCB)

Normally:

Input voltage: <5V, changeable

Output voltage:<5V, changeable

Outdoor power PCB is defective.

No

Off: 105c; On: 90c

The trouble shooting is same with the one of indoor unit P2 protection.

Outdoor unit display

LED STATUS

P3 Compressor current protection

Outdoor unit display

LED STATUS

P4

Compressor drive malfunction（drive protection arose）

Check the resistance of compressor, normally

U and V is 1 ohm

U and W is 1 ohm

V and W is 1ohm

Turn one indoor unit only, Does the compressor start after
3 minutes?

Does the trouble occur again after compressor
running some time?

No

Yes

No

The compressor is defective

Check the refrigerant circulation volume and pressure

No

The compressor is defective

Yes

If refrigerant circulation volume and pressure is OK, change the outdoor main PCB.

Outdoor unit display LED STATUS

P4(LED flashes for nine times)

Compressor drive malfunction（module protection arose）

Outdoor unit display LED STATUS

Are the U,V,W connected to compressor and inverter module

Replace the module to see if it is normal？

Replace the outdoor power board

If the problem comes to again, check wingding resistance of inverter compressor, is it right?

Replace inverter compressor

Repair connector

Yes No

No

Replace inverter compressor

Repair connector

If the problem comes to again, check wingding resistance of inverter compressor, is it 1 ohm?

Replace the outdoor power board

Are the U,V,W connected to compressor and inverter module right?

Yes

No

No

P6 Condenser high-temperature protection

When outdoor pipe temp. is more than 65°C, the unit will stop, and unit runs again when outdoor pipe
temp. less than 52°C.

Annex 1

Characteristic of temp. sensor

Temp.℃ Resistance KΩ Temp.℃ Resistance KΩ Temp.℃ Resistance KΩ

-10 62.2756 17 14.6181 44 4.3874

-9 58.7079 18 13.918 45 4.2126

-8 56.3694 19 13.2631 46 4.0459

-7 52.2438 20 12.6431 47 3.8867

-6 49.3161 21 12.0561 48 3.7348

-5 46.5725 22 11.5 49 3.5896

-4 44 23 10.9731 50 3.451

-3 41.5878 24 10.4736 51 3.3185

-2 39.8239 25 10 52 3.1918

-1 37.1988 26 9.5507 53 3.0707

0 35.2024 27 9.1245 54 2.959

1 33.3269 28 8.7198 55 2.8442

2 31.5635 29 8.3357 56 2.7382

Is the outdoor pipe temp. more than 65°C ?

Is the outdoor pipe temp sensor right according to the annex 1

Replace the outdoor main board

No

Yes

Replace the outdoor pipe temp sensor

No

3 29.9058 30 7.9708 57 2.6368

4 28.3459 31 7.6241 58 2.5397

5 26.8778 32 7.2946 59 2.4468

6 25.4954 33 6.9814 60 2.3577

7 24.1932 34 6.6835 61 2.2725

8 22.5662 35 6.4002 62 2.1907

9 21.8094 36 6.1306 63 2.1124

10 20.7184 37 5.8736 64 2.0373

11 19.6891 38 5.6296 65 1.9653

12 18.7177 39 5.3969 66 1.8963

13 17.8005 40 5.1752 67 1.830

14 16.9341 41 4.9639 68 1.7665

15 16.1156 42 4.7625 69 1.7055

16 15.3418 43 4.5705 70 1.6469

Annex 2

1. Reference voltage data:

a) Rectifier : Input :220-230V(AC), output :310V(DC)

b) Inverter module: U,V, W 3ph.

Result

U-V 60-150V(AC)

U-W 60-150V(AC)

V-W 60-150V(AC)

P-N DC

31
0V

c) Photo-couple PC817, PC851: Control side <+5V, AC side :< 24V(AC)

d) S terminal and N: changeable from 0-24V

2. Check the Diode Bridge component ( In wiring diagram, rectifier)

Remark: If this part is abnormal, the LED will not light.

Result

Multi-meter

Forward Resistance Backward Resistance

+ _ Infinite Infinite
~
~

+

~500 ohm Infinite

~ ­~

~500 ohm Infinite

~ +

- ~