Midea Aqua Tempo Super II, MC-SU60-RN1L, MC-SU30-RN1L Service Manual

Commercial Air Conditioners

Service Manual

Aqua Tempo Super II

6. Four-way valve: Controls refrigerant flow direction. Closed in cooling mode and open in heating mode. When closed, the air side heat exchanger functions as a condenser and water side heat exchanger functions as an evaporator; when open, the air side heat exchanger functions as an evaporator and water side heat exchanger function as a condenser.

7. High and low pressure switches: Regulate refrigerant system pressure. When the refrigerant system pressure rises above the upper limit or falls below the lower limit, the high or low pressure switches turn off, stopping the compressor.

8. Discharge temperature switch: Protects the compressor from abnormally high temperatures and transient spikes in temperature.

9. Air purge valve: Automatically removes air from the water circuit.

10.Safety valve Prevents excessive water pressure by opening at 43.5psi (3bar) and discharging water from the water circuit.

11.Water flow switch: Detects water flow rate to protect the compressor and wat er pump in the event of insu fficient water flow.

12.Water pump: Circulates water in the water circuit.

13.Pressure se n so r Measures refrigerant system pressure.

14.Crankcase heater Prevents refrigerant from mixing with compressor oil when the compressors are stopped.

15.Water side heat exchanger e lectric heater Protects the water side heat exchanger from ice formation.

16.Water flow switch electric heater: Provides additional heating when heating capacity provided by the heat pump is insufficient due to low ambient temperatures, it also protects external water pipes from freezing.

17.Solenoid valve SV4 Returns oil to the compressor. It opens after 17 minut es of com pressor operation, closes after 3 minut es, t hen opens again for 3 minutes at 17 minute increments.

12 201612

Refrigerant Ci rcuits

3 Refrigerant Flow Diagrams

Heating operation

Figure 2-3.1: Refrigerant flow during heating operation

Aqua Tempo Super II

Part 2 - Component Layout and

Cooling and defrosting operation

Figure 2-3.2: Refrigerant flow during cooling and defrosting o perations

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Part 3

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Part 3

Control

1 General Control Scheme Flowchart ..................................................... 16

2 Stop Operation .................................................................................... 17

3 Standby Control .................................................................................. 17

4 Startup Control .................................................................................... 18

5 Normal Operation Control ................................................................... 20

6 Protection Control ............................................................................... 23

7 Special Control .................................................................................... 29

8 Role of Temperature Sensors in Control Functions ............................... 31

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S5_4 on main

PCB set to ON

Conditions met

for defrosting

Thermo on

Special control

 Outdoor unit duty cycling

 Additional control

 Defrosting operation

7

Stop operation

 System stops

2

Standby control

 Water pump control

3

Startup control

 Startup control for cooling operation

4

Thermo on

Normal operation control

 Outdoor fan control

5

Protection control

 Water side heat exchanger temperature difference protection control

6

1 General Control Scheme Flowchart

Sections 3-2 to 3-7 on the following pages detail when each of the controls in the flowchart below is activated.

 Abnormal shutdown

 Crankcase heater control

 Compressor startup delay control  Compressor startup program  Startup control for heating operation

 Component control during normal operation  Compressor output control

 Compressor step control

 Water pump select control  Four-way valve control  Electronic expansion valve control

 High pressure protection control  Low pressure protection control

 Discharge temperature protection control

 Compressor and inverter module protection control  Voltage protection control  DC fan motor protection control  Water side heat exchanger anti-freeze protection control  Air side heat exchanger high temperature protection control

Note:

1. Numbers in the top right-hand corners of boxes indicate the relevant section of text on the following pages.

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Figure 3-3.1: Crankcase heater controlled according to outdoor ambient temperature

Figure 3-3.2: Crankcase heater controlled according to discharge temperature

Notes:

1. Tp1: discharge temperature sensor 1, Tp2: discharge temperature sensor 2.

Ambient temperature < 35 oC

Ambient temperature > 40 oC

Crankcase heater off

Crankcase heater is controlled according to discharge temperature

Max (Tp1, Tp2) < 40 oC

Max (Tp1, Tp2) > 50 oC

Crankcase heater off

Crankcase heater on

2 Stop Operation

The stop operation occurs for one of the following reasons:

1. Abnormal shutdown: in order to protect the compressors, if an abnormal state occurs the system makes a 'stop with

thermo off’ operation and an error code is displayed on the outdoor unit’s PCB digital displays and on the user

interface.

2. The system stops when the set temperature has been reached.

3 Standby Control

3.1 Crankcase Heater Control

The crankcase heater is used to prevent refrigerant from mixing with compressor oil when the compressors are stopped.

The crankcase heater is controlled according to the outdoor ambient temperature and discharge temperature. When the

outdoor ambient temperature is above 40°C, the crankcase heater is off; when the outdoor ambient temperature is below

35°C, the crankcase heater is controlled according to discharge temperature. Refer to Figures 3-3.1 and 3-3.2.

3.2 Water Pump Control

When the outdoor unit is in standby, the circulator pumps run continuously。

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Figure 3-4.1: Compressor startup program1 when ambient temperature is above 10°C

Notes:

1. Once the first, 60-second stage of the program is complete, the program proceeds to the subsequent stages in a

step-by-step fashion and exits when the target rotation speed has been reached.

Figure 3-4.2: Compressor startup program1 when ambient temperature is at or below 10°C

Notes:

1. Once the first, 90-second stage of the program is complete, the program proceeds to the subsequent stages in a

step-by-step fashion and exits when the target rotation speed has been reached.

42rps 60S

56rps

34rps

66rps

76rps

80rps

90rps

90S

180S

60S

180S

100rps

Target rotation speed

Compressor rotation speed (rps)

Time (s)

105rps

300S

42rps

90S

28rps

120S

34rps

60S

42rps

90S

56rps

60S

76rps

60S

66rps

60S

80rps

90S

90rps

180S

100rps

180S

Target rotation speed

Compressor

rotation speed (rps)

Time (s)

105rps

300S

4 Startup Control

4.1 Compressor Startup Delay Control

In initial startup control and restart control (except in defrosting operation), compressor startup is delayed such that a

minimum 7 minutes has elapsed since the compressor stopped, in order to prevent frequency compressor on/off and to

equalize the pressure within the refrigerant system.

4.2 Compressor Startup Program

In initial startup control and in re-start control, compressor startup is controlled according to outdoor ambient

temperature and discharge temperature. Compressor startup follows one of two startup programs until the target rotation

speed is reached. Refer to Figures 3-4.1, 3-4.2.

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Component

Wiring diagram

label

30kW

60kW

Control functions and states

Inverter compressor A

COMP A

●

Compressor startup program selected according to

ambient temperature and discharge temperature1

Inverter compressor B

COMP B

●

DC fan motor A

FAN A

●

Controlled according to ambient temperature DC fan motor B

FAN B

●

Electronic expansion valve

EXV 1

●

Position (steps) from 0 (fully closed) to 480 (fully

open), controlled according to outdoor ambient

temperature, unit capacity.

Four-way valve

STF1

●

On after the compressor startup for 10s

Solenoid valve (oil balance)

SV4_1

●

Closed for 200s, open for 600s, then closed

Water pump1

PUPM1

●

On Water pump2

PUPM2

●

Water side heat exchanger heater 1

EVA-HEAT 1

●

According to water side heat exchanger

anti-freezing temperature (Taf)

Water side heat exchanger heater 2

EVA-HEAT 2

●

Water flow switch heater

W-HEAT1

●

Controlled according to ambient temperature, water

inlet temperature and water outlet temperature

Electric auxiliary heater

E-HEAT_L/

E-HEAT_N

●

Controlled according to ambient temperature and

total water outlet temperature after the compressor

is on

Crank case heater 1

HEAT1

●

Controlled according to ambient temperature and

discharge temperature

Crank case heater 2

HEAT2

●

Notes:

1. Refer to Figure 3-4.1, Figure 3-4.2 and in Part 3, 4.2 “Compressor Startup Program”.

Component

Wiring diagram

label

30kW

60kW

Control functions and states

Inverter compressor A

COMP A

●

Compressor startup program selected according to

ambient temperature and discharge temperature1

Inverter compressor B

COMP B

●

DC fan motor A

FAN A

●

Controlled according to air side heat exchanger

refrigerant total outlet temperature (Tz/7)

DC fan motor B

FAN B

●

Electronic expansion valve

EXV 1

●

Position (steps) from 0 (fully closed) to 480 (fully

open), controlled according to outdoor ambient

temperature, outdoor unit initial frequency

Four-way valve

STF1

●

Off

Solenoid valve (oil balance)

SV4_1

●

Closed for 200s, open for 600s, then closed

Water pump1

PUPM1

●

On Water pump2

PUPM2

Water side heat exchanger heater 1

EVA-HEAT 1

●

According to water side heat exchanger

anti-freezing temperature (Taf)

Water side heat exchanger heater 2

EVA-HEAT 2

●

Water flow switch heater

W-HEAT1

●

Controlled according to ambient temperature, water

inlet temperature and water outlet temperature

Electric auxiliary heat

E-HEAT_L/

E-HEAT_N

●

Off Crank case heater 1

Heat 1

●

Controlled according to ambient temperature and

discharge temperature

Crank case heater 2

Heat 2

●

Notes:

1. Refer to Figure 3-4.1, Figure 3-4.2 and in Part 3, 4.2 “Compressor Startup Program”.

4.3 Startup Control for Heating Operation

Table 3-4.1: Component control during startup in heating mode

4.4 Startup Control for Cooling Operation

Table 3-4.2: Component control during startup in cooling mode

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Component

Wiring diagram

label

30kW

60kW

Control functions and states

Inverter compressor A

COMP A

●

Controlled according to load requirement Inverter compressor B

COMP B

●

DC fan motor A

FAN A

●

Controlled according to air side heat exchanger pipe

temperature and discharge pressure

DC fan motor B

FAN B

●

Electronic expansion valve

EXV 1

●

Position (steps) from 0 (fully closed) to 480 (fully

open), controlled according to discharge superheat

and compressor frequency, and use suction

temperature, air side heater exchanger temperature,

discharge temperature to modify the control.

Four-way valve

STF1

●

On

Solenoid valve (oil balance)

SV4_1

●

Open regularly

Water pump1

PUPM1

●

On Water pump2

PUPM2

●

Water side heat exchanger heater 1

EVA-HEAT 1

●

Off Water side heat exchanger heater 2

EVA-HEAT 1

●

Water flow switch heater

W-HEAT1

●

Off

Electric auxiliary heater

E-HEAT_L/

E-HEAT_N

●

Controlled according to ambient temperature Crank case heater 1

HEAT1

●

Off Crank case heater 2

HEAT2

●

Component

Wiring diagram

label

30kW

60kW

Control functions and states

Inverter compressor A

COMP A

●

Controlled according to load requirement Inverter compressor B

COMP B

●

DC fan motor A

FAN A

●

Controlled according to air side heat exchanger

refrigerant total outlet temperature (Tz/7)

DC fan motor B

FAN B

●

Electronic expansion valve

EXV 1

●

Position (steps) from 0 (fully closed) to 480 (fully

open), controlled according to suction superheat,

water inlet temperature and compressor frequency.

Four-way valve

STF1

●

Off

Solenoid valve (oil balance)

SV4_1

●

Open regularly

Water pump1

PUPM1

●

On Water pump2

PUPM2

●

Water side heat exchanger heater 1

EVA-HEAT 1

●

According to water side heat exchanger

anti-freezing temperature (Taf)

Water side heat exchanger heater 2

EVA-HEAT 2

●

Water flow switch heater

W-HEAT1

●

Off

Electric auxiliary heater

E-HEAT_L/

E-HEAT_N

●

Off Crank case heater 1

HEAT1

●

Off Crank case heater 2

HEAT2

●

5 Normal Operation Control

5.1 Component Control during Normal Operation

Table 3-5.1: Component control during heating operation

Table 3-5.2: Component control during cooling operation

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5.2 Compressor Output Control

The compressor rotation speed is controlled according to the load requirement. Before compressor startup, the outdoor

unit determines the compressor target speed according to outdoor ambient temperature, discharge temperature and then

runs the appropriate compressor startup program. Refer to Part 3, 4.2 “Compressor Startup Program”. Once the startup

program is complete, the compressor runs at the target rotation speed.

The compressor speed is controlled according to two parts in normal operation:

In cooling mode: In a single system, the compressor speed is controlled according to the water outlet temperature and

water outlet setting temperature. In a combination system, the compressor of master unit is controlled according total

water outlet temperature and water outlet setting temperature, the compressor of the slave unit is controlled according to

water inlet and water outlet temperature. Both in a single system and combination system, the compressor speed is

limited by the inverter module temperature (Tf), ambient temperature, discharge temperature and air side heat exchanger

refrigerant total outlet temperature (Tz/7).

In heating mode: In a single system, the compressor speed is controlled according to the water outlet temperature and

water outlet setting temperature. In a combination system, all compressors are controlled according to the total water

outlet temperature and the water outlet setting temperature. Both in a single system and combination system, the

compressor speed is limited by inverter module temperature (Tf), ambient temperature, discharge temperature, discharge

pressure.

5.3 Compressor Step Control

The running speed of six-pole compressors in rotations per second (rps) is one third of the frequency (in Hz) of the

electrical input to the compressor motor. The frequency of the electrical input to the compressor motors can be altered at

a rate of 1Hz in two seconds.

5.4 Water pump select control

When the dial switch S5_3 on the main PCB is switched ON, the system runs “one small pump per unit” mode, when S5_3

is switched OFF, the system run “one large pump controlled by master unit” mode.

 One pump control: only the master unit output pump signal, no pump signal output on the slave units.  Multiple pump control: output pump signal on all units.  S5_3 in one system must be switched to the same position or not error code FP will be displayed.

5.5 Four-way Valve Control

The four-way valve is used to change the direction of refrigerant flow through the water side heat exchanger in order to

switch between cooling and heating operations. Refer to Figures 2-3.1 and 2-3.2 in Part 2, 3 “Refrigerant Flow Diagrams”.

During heating operation, the four-way valve is on; during cooling and defrosting operation, the four-way valve is off.

5.6 Electronic Expansion Valve Control

The position of the electronic expansion valve (EXV) is controlled in steps from 0 (fully closed) to 480 (fully open).

 At power-on:  The EXV first closes fully, then moves to the standby position (352 (steps)). After 30seconds the EXV moves to an

initial running position, which is determined according to the operating mode and outdoor ambient temperature.

 When the unit operate in cooling mode, after 60 seconds, the EXV is controlled according to suction superheat, water

inlet temperature and compressor frequency.

 When the unit operates in heating mode, after a further 60 seconds, the EXV is controlled according to discharge

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Table 3-5.3: Outdoor fan speed steps

Fan speed index

Fan speed (rpm)

30kW

60kW

FAN A

FAN B 0 0 0 0 1 150

150

0 2 200

200

0 3 250

250

0 4 300

300

250 5 360

360

300 6 430

430

360 7 480

530

460

8 (super silent mode)

530

650

580 9 650

760

680

10(silent mode)

710

850

800

11

800

900

850

12(standard ESP mode)

820

950

900

Abbreviations: ESP: External static pressure

superheat and compressor frequency, and uses the suction temperature, air side heater exchanger temperature,

discharge temperature to modify the control.

 When the outdoor unit is in standby:

 The EXV is at position 352 (steps).

 When the outdoor unit stops:

 The EXV first closes fully, then moves to the standby position (352 (steps)).

5.7 Outdoor Fan Control

The speed of the outdoor unit fan(s) is adjusted in steps, as shown in Table 3-5.3.

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Figure 3-6.1: High pressure protection control

Notes:

1. P

c

: Discharge pressure

Figure 3-6.2: Low pressure protection control

Notes:

1. P

e

: Suction pressure

Figure 3-6.3: High discharge temperature protection control

When P1 protection occurs 5 times

in 120 minutes, ta manual system

restart is required before the system

can resume operation.

Pc > 4.4MPa

Pc < 3.2MPa

Normal operation

Low pressure protection, error code P0 is displayed

When P0 protection occurs 5 times

in 120 minutes, a manual system

restart is required before the system

can resume operation.

Pe < 0.14MPa

Pe > 0.3MPa

Normal operation

Low pressure protection, error code P1 is displayed

Discharge temperature > 110°C

Discharge temperature < 100°C

Normal operation

High discharge temperature protection, error code P0 is

When P0 protection occurs 5 times

in 120 minutes, ta manual system

restart is required before the system

can resume operation.

6 Protection Control

6.1 High Pressure Protection Control

This control protects the refrigerant system from abnormally high pressure and protects the compressor from transient

spikes in pressure.

When the discharge pressure rises above 4.4MPa the system displays P0 protection and all units stop running. When the

discharge pressure drops below 3.2MPa, the compressor enters re-start control.

6.2 Low Pressure Protection Control

This control protects the refrigerant system from abnormally low pressure and protects the compressor from transient

drops in pressure.

When the suction pressure drops below 0.14MPa the system displays P0 protection and all the units stop running. When

the suction pressure rises above 0.3MPa, the compressor enters re-start control.

6.3 Discharge Temperature Protection Control

This control protects the compressor from abnormally high temperatures and transient spikes in temperature.

When the discharge temperature rises above 110°C the system displays P0 protection and all the units stop running. When

the discharge temperature drops below 100°C , the compressor enters re-start control.

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Figure 3-6.4: Compressor current protection control

Notes:

1. P4 is the protection for the power supply phase B, P5 is the protection for the power supply phase C.

Figure 3-6.5: Inverter module temperature protection control

Notes:

1. Tf1:Heat sink temperature 1; Tf2:Heat sink temperature 2

Figure 3-6.6: Compressor voltage protection control

Current > 25A

Current < 25A

Normal operation

Compressor current protection, error code P4 or P5 is displayed

Tf1 or Tf2 > 82°C

Tf1 and Tf2 < 60°C

Normal operation

Inverter module temperature protection, error code PL is displayed

Voltage ≥ 260V

or Voltage < 165V

180V ≤ Voltage < 250V

Normal operation

Compressor voltage protection, error code H1 is displayed

When P4 or P5 protection occurs 5

times in 120 minutes, ta manual

system restart is required before the

system can resume operation.

C7 is displayed when PL error occurs

3 times in 100 minutes, a manual

system restart is required before the

system can resume operation.

6.4 Compressor and Inverter Module Protection Control

This control protects the compressors from abnormally high currents and protects the inverter modules from abnormally

high temperatures. It is performed for each compressor and inverter module.

When the compressor current rises above25A, the system displays P4 or P5 protection and all the units stop running.

When the compressor current drops below 25A, the compressor enters re-start control.

When the Tf1 or Tf2 temperature rises above 82°C , the system displays PL protection and all the units stop running. When

the Tf1 and Tf2 temperature drops below 60°C, the compressor enters re-start control.

6.5 Voltage Protection Control

This control protects the units from abnormally high or abnormally low voltages.

When the phase voltage of AC power supply is at or above 260V for more than 30 seconds, the system displays H1

protection and all the units stop running. When the phase voltage drops below 250V for more than 30 seconds, the units

restart once the compressor re-start delay has elapsed. When the phase voltage is below 165V for more than 30 seconds,

the system displays H1 protection and all the units stop running. When the AC voltage rises to at or above 180V for more

than 30 seconds, the refrigerant system restarts once the compressor re-start delay has elapsed.

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Figure 3-6.7: Anti-freeze protection control in normal cooling mode

Note:

1. Taf include Taf1 and Taf2.

Figure 3-6.8: Anti-freeze protection control in low water outlet cooling mode

Note:

1. Taf include Taf1 and Taf2.

Min(Tw/Two/Twi/Taf1) ≤ 4°C

Tw > 15°C

Normal operation

Anti-freeze protection, error code Pb is displayed

Min(Tw/Two/Twi/Taf1) ≤ 0°C

Tw > 15°C

Normal operation

Anti-freeze protection, error code Pb is displayed

6.6 DC Fan Motor Protection Control

This control protects the DC fan motors from abnormal power supply. DC fan motor protection occurs when the fan

module does not receive any feedback from the fan motor.

When DC fan motor protection control occurs the system displays the PU error code and the unit stops running. When PU

protection occurs 2 times in 120 minutes, the FF error is displayed. When an FF error occurs, a manual system restart is

required before the system can resume operation.

6.7 Water Side Heat Exchanger Anti-freeze Protection Control

This control protects the water side heat exchanger from ice formation. The water side heat exchanger electric heater is

controlled according to water side heat exchanger anti-freezing temperature (Taf), water inlet temperature (Twi), water

outlet temperature (Two) and total water outlet temperature (Tw).

When water side heat exchanger anti-freeze protection occurs the system displays error code Pb and all the units stop

running.

In standby or normal cooling mode, either water side heat exchanger anti-freezing temperature (Taf), water inlet

temperature (Twi), water outlet temperature (Two) or total water outlet temperature (Tw) is below 4°C, the unit will run

heating mode , until the total water outlet temperature is above 15°C, and restart the normal operation.

In low water outlet cooling mode, either water side heat exchanger anti-freezing temperature (Taf), water inlet

temperature (Twi), water outlet temperature (Two) or total water outlet temperature (Tw) is below 0°C, the unit will run

heating mode , until the total water outlet temperature is above 15°C, and restart the normal operation.

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Figure 3-6.9: Air side heat exchanger high temperature protection control 1

Note:

1. T3: Air side heat exchanger refrigerant outlet temperature

Figure 3-6.10: Air side heat exchanger temperature protection control 2

Note:

1. Tz/7: Air side heat exchanger refrigerant total outlet temperature

Figure 3-6.11: Water side heat exchanger temperature difference protection control

Notes:

1. Twi: Water side heat exchanger inlet temperature

2. Two: Water side heat exchanger outlet temperature

T3 > 65°C

T3 < 60°C

Normal operation

High temperature protection, error code P7 is displayed

Tz/7 ≥ 62°C

Tz/7 < 62°C

Normal operation

High temperature protection, error code P7 is displayed

∣Twi-Two∣≥ 12°C

∣Twi-Two∣< 6°C

Normal operation

Temperature difference protection, error code P9 is displayed

When P9 protection occurs 3 times

in 60 minutes, a manual system

restart is required before the system

can resume operation.

6.8 Air Side Heat Exchanger High Temperature Protection Control

This control protects the air side heat exchanger from high temperature.

When the air side heat exchanger refrigerant outlet temperature (T3) rises above 65°C , the system displays P7 protection

and all the units stop running. When the air side heat exchanger refrigerant outlet temperature (T3) drops below 60°C, the

compressor enters re-start control.

When the air side heat exchanger refrigerant total outlet temperature (Tz/7) temperature rises at or above 62°C , the

system displays P7 protection and the unit stops running. When the air side heat exchanger refrigerant total outlet

temperature (Tz/7) temperature drops below 62°C, the compressor enters re-start control.

6.9 Water Side Heat Exchanger Temperature Difference Protection Control

This control protects the water side heat exchanger from ice formation.

When the temperature difference rises at or above 12°C , the system displays P9 protection and all the units stop running.

When the Temperature difference drops below 6°C, the compressor enters re-start control.

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Figure 3-6.12: Water side heat exchanger low temperature protection control in normal cooling mode

Notes:

1. Taf1: Water side heat exchanger anti-freezing temperature1

2. Taf2: Water side heat exchanger anti-freezing temperature2

Figure 3-6.13: Water side heat exchanger low temperature protection control in low water outlet mode

Min (Taf1 or Taf2) ≤ 3°C

Min (Taf1 and Taf2) >10°C

Normal operation

Low temperature protection, error code PE is

Min (Taf1 or Taf2) ≤ 0°C

Min (Taf1 and Taf2) > 5°C

Normal operation

Low temperature protection, error code PE is displayed

6.10 Water Side Heat Exchanger Low Temperature Protection Control

This control protects the water side heat exchanger from ice formation.

When water side heat exchanger anti-freezing temperature1 (Taf1) or water side heat exchanger anti-freezing

temperature2 (Taf2) is at or below 3°C for more than 3 seconds, the system displays PE protection and the corresponding

unit stop running. When water side heat exchanger anti-freezing temperature1 (Taf1) and Water side heat exchanger

anti-freezing temperature2 (Taf2) rise to 10°C or higher, the compressor enters re-start control. Use the user interface to

clear the error.

When water side heat exchanger anti-freezing temperature1 (Taf1) or water side heat exchanger anti-freezing

temperature2 (Taf2) is at or below 0°C for more than 3 seconds, the system displays PE protection and orders the

corresponding units to stop running. When water side heat exchanger anti-freezing temperature1 (Taf1) and Water side

heat exchanger anti-freezing temperature2 (Taf2) rise to 5°C or higher, the compressor enters re-start control. Use the user

interface to clear the error.

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Figure 3-6.14: Water side heat exchanger low pressure protection control in normal cooling mode

Note:

1. Pe: Suction pressure

Figure 3-6.15: Water side heat exchanger low pressure protection control in low water outlet cooling mode

Note:

1. Pe: Suction pressure

Pe < 0.6Mpa

Pe ˃ 0.6Mpa

Normal operation

Low pressure protection, error code PC is

Pe < 0.4Mpa

Pe ˃ 0.4Mpa

Normal operation

Low pressure protection, error code PC is

When system displays PC protection

and a manual system restart is

required before the system can

resume operation.

When system displays PC protection

and a manual system restart is

required before the system can

resume operation.

6.11 Water Side Heat Exchanger Low Pressure Protection Control

This control protects the water side heat exchanger from ice formation.

In normal cooling mode, when the suction pressure drops below 0.6Mpa, the system displays PE protection and all the

units stop running. When the suction pressure is above 0.6Mpa or higher, the compressor enters re-start control. It will not

display the PC error when the suction pressure drops below 0.6Mpa for the first time until the suction pressure drops

below 0.6Mpa for the second time in 30 minutes.

In low water outlet cooling mode, when the suction pressure drops below 0.4Mpa, the system displays PE protection and

all the units stop running. When the suction pressure is above 0.4Mpa or higher, the compressor enters re-start control. It

will not display the PC error when the suction pressure drops below 0.4Mpa for the first time until the suction pressure

drops below 0.4Mpa for the second time in 30 minutes.

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Part 3

- Control

Startup control

Normal operation

After defrosting operation or on

restart following compressor stop

after set temperature s reached

Normal operation

Outdoor unit

duty cycling

Priority

1

Priority

2

……

Priority

16

Master

Slave 1

Slave 15

Outdoor unit

duty cycling

Priority

16

Priority

15

Priority

1

Master

Slave 1

Slave 15

……

7 Special Control

7.1 Outdoor Unit Duty Cycling

In systems with multiple outdoor units, outdoor unit duty cycling is used to balance the compressor running time.

Outdoor unit duty cycling occurs whenever all the outdoor units stop running (either because the leaving water set

temperature has been reached or because a master unit error has occurred):

 When the outdoor units are powered on for the first time, if there is a load requirement, the units turn on, starting

with the master unit. As the leaving water temperature approaches its set temperature, units shut down in succession,

starting with the unit with the highest address. Once the set temperature has been reached, the master unit shuts

down.

 The next time a load requirement exists (or, following a master unit error), the units turn on, starting with the unit

with the highest address. As the leaving water temperature approaches its set temperature, units shut down in

succession, starting with the unit with the lowest address (the master unit). Once the set temperature has been

reached, the unit with the highest address shuts down.

Figure 3-7.1 shows an example of duty cycling in a system with 16 outdoor units.

Figure 3-7.1: Duty cycling in a system with 16 outdoor units

1

Notes:

1. The address settings on the outdoor unit main PCBs for master unit and slave unit do not change.

7.2 Defrosting Operation

In order to recover heating capacity, the defrosting operation is conducted when the outdoor unit air side heat exchanger

is performing as a condenser. The defrosting operation is controlled according to outdoor ambient temperature, air side

heat exchanger refrigerant outlet temperature and the compressor running time.

The defrosting operation ceases when any one of the following three conditions occurs:

 Defrosting operation duration reaches 10 minutes.  The air side heat exchanger refrigerant outlet temperature reaches the target temperature.  The water outlet temperature is at or below 5°C .

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Component

Wiring diagram

label

30kW

60kW

Control functions and states

Inverter compressor A

COMP A

●

Runs at defrosting operation rotation speed

Inverter compressor B

COMP B

●

DC fan motor A

FAN A

●

Off

DC fan motor B

FAN B

●

Electronic expansion valve

EXV 1

●

Full open

Four-way valve

STF1

●

Off

Solenoid valve (oil balance)

SV4_1

●

Open regularly

Water pump1

PUPM1

●

ON

Water pump2

PUPM2

●

Water side heat exchanger heater 1

EVA-HEAT 1

●

Off

Water side heat exchanger heater 2

EVA-HEAT 2

●

Water flow switch heater

W-HEAT1

●

Off

Electric auxiliary heat

E-HEAT_L

●

According to ambient temperature

Crank case heater 1

HEAT1

●

Off

Crank case heater 2

HEAT2

●

Table 3-7.1: Component control during defrosting operation

7.3 Additional control

When dial switch S5_4 on main PCB is switched ON, additional control is valid, connect a controller or not is permissible.

When dial switch S5_4 is switched OFF, additional control is invalid. This function is only valid on the master unit.

When dial switch S5_4 is switched ON and disconnect a wired controller:

 The system ON/OFF state is controlled by the ON/OFF port (CN44 on the main PCB). Connecting this port, system on,

disconnecting this port, system off.

 The mode of the system is controlled by the Cool/Heat port (CN44 on the main PCB). Connecting this port, system

running heating mode, disconnecting this port, system running cooling mode.

 The default water outlet temperature setting in heating mode is 45°C and in cooling mode is 7°C . The default

hysteresis temperature setting is 2°C .

 The network icon on the wired controlled flashes, frequency and “rctc” alternate display on main PCB .

When dial switch S5_4 is switched ON and connect a wired controller, the water outlet temperature and hysteresis

temperature can be set by the wired controller.

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- Control

Number

Sensor name1

Sensor

code

Mode

Control functions

1

Discharge pipe temperature sensor 1/ Discharge pipe temperature sensor 2

Tp1/Tp2

Heating

 Crankcase heater control

1

 Electronic expansion valve control

2

 Compressor output control

3

 Discharge temperature protection

control4

Cooling

 Crankcase heater control

1

 Compressor output control

3

 Discharge temperature protection

control4

2

Outdoor ambient temperature sensor

T4

Heating

 Crankcase heater control

1

 Electric auxiliary heater control  Water flow switch heater control  Compressor output control

3

 Electronic expansion valve control

2

 Outdoor fan control

5

Cooling

 Crankcase heater control

1

 Compressor output control

3

 Defrosting operation control

6

 Electronic expansion valve control

2

 Outdoor fan control

5

3

Air side heat exchanger refrigerant outlet temperature sensor

T3

Heating

 Outdoor fan control

5

 Electronic expansion valve control

2

Cooling

 Defrosting operation control

6

 Air side heat exchanger high

temperature protection control7

4

Total cooling outlet temperature sensor

TZ/7

Heating

None

Cooling

 Outdoor fan control

5

 Compressor output control

3

 Air side heat exchanger high

temperature protection control7

5

Water side heat exchanger anti-freezing temperature sensor1/Water side heat exchanger anti-freezing temperature sensor 2

Taf1/

Taf2

Heating

None

Cooling

 Water side heat exchanger heater

control

 Water side heat exchanger anti-freeze

protection control8

 Water side heat exchanger low

temperature protection control9

6

Suction pipe temperature sensor

Th

Heating

 Electronic expansion valve control

2

Cooling

 Electronic expansion valve control

2

7

Water inlet temperature sensor

Twi

Heating

 Water flow switch heater control

Cooling

 Electronic expansion valve control

2

 Compressor output control

3

 Water flow switch heater control  Water side heat exchanger anti-freeze

protection control8

 Water side heat exchanger

temperature difference protection control10

8

Water outlet temperature sensor

Two

Heating

 Compressor output control

3

 Water flow switch heater control

Cooling

 Compressor output control

3

 Defrosting operation control

6

 Water flow switch heater control  Water side heat exchanger anti-freeze

protection control8

 Water side heat exchanger

temperature difference protection control10

8 Role of Temperature Sensors in Control Functions

Table 3-8.1: Names and functions of the temperature sensors

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9

Total water outlet temperature sensor

Tw

Heating

 Compressor output control

3

 Electric auxiliary heater control

Cooling

 Compressor output control

3

 Water side heat exchanger anti-freeze

protection control8

10

Inverter module temperature sensor 1/ Inverter module temperature sensor 2

Tf1/Tf2

Heating

 Compressor output control

3

 Inverter module temperature

protection11

Cooling

 Compressor output control

3

 Outdoor fan control

5

 Inverter module temperature

protection11

Notes:

1. Refer to part 3, 3.1 “Crankcase Heater Control".

2. Refer to part 3, 5.6 “Electronic Expansion Valve Control".

3. Refer to part 3, 5.2 “Compressor Output Control".

4. Refer to part 3, 6.3 “Discharge Temperature Protection Control".

5. Refer to part 3, 5.7 “Outdoor Fan Control".

6. Refer to part 3, 7.2 “Defrosting Operation".

7. Refer to part 3, 6.8 “Air Side Heat Exchanger High Temperature Protection Control".

8. Refer to part 3, 6.7 “Water Side Heat Exchanger Anti-freeze Protection Control ".

9. Refer to part 3, 6.10 “Water Side Heat Exchanger Low Temperature Protection Control ".

10. Refer to part 3, 6.9 “Water Side Heat Exchanger Temperature Difference Protection Control ".

11. Refer to part 3, 6.4 “Compressor and Inverter Module Protection Control "

12. All sensor names in his service manual referring to refrigerant flow is named according refrigerant flow during cooling operation refer to

part2,3 ”Refrigerant Flow Diagram ”.

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Part

4 - Diagnosis and Troubleshooting

Part 4

Diagnosis and

Troubleshooting

1 Outdoor Unit Electric Control Box Layout ............................................. 34

2 Outdoor Unit PCBs ............................................................................... 36

3 Error Code Table .................................................................................. 47

4 Troubleshooting .................................................................................. 49

5 Appendix to Part 5 ............................................................................... 95

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Figure 4-1.1: Electric control box front view- top layer

Main control board

Wired controller

Power supply terminal

3-way terminal

Figure 4-1.2: Electric control box front view-bottom layer

AC indicator A

AC filter board

Reactor

Inverter module

AC indicator B

Fan module

Three-phase bridge rectifier

1 Outdoor Unit Electric Control Box Layout

MC-SU30-RN1L

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Figure 4-1.3: Electric control box front view-top layer

AC filter board A

Main control board

Wired controller

3-way terminal

Figure 4-1.4: Electric control box side view-bottom layer

Inverter module A

Three-phase bridge

rectifier B

Inverter module B

Reactor A

AC indicator A

Three-phase

bridge

rectifier A

Reactor B

Power supply

terminal

Fan module B

AC filter board B

AC indicator B

Fan module A

MC-SU60-RN1L

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Figure 4-2.1: Outdoor unit main PCB

1 2 3 4 5 6 7 8 9

36

35

34

33

32

31

30

10

11

12

13

14

15

16

29 28 27 26 25 24 23 22 21 20 19 18 17

30

2 Outdoor Unit PCBs

2.1 Types

Aqua Tempo Super II units have four PCBs – main control board, three phase AC filter board, DC fan inverter module board

and compressor inverter module board.

In addition to the four PCBs, MC-SU30-RN1L model each has one board while MC-SU30-RN1L model have one main control

board and the other boards each has two boards.

The locations of each PCB in the outdoor unit electric control boxes are shown in Figures 4-1.1 to 4-1.4 in Part 4, 1

“Outdoor Unit Electric Control Box Layout”.

2.2 Main PCB

Note:

1. Label descriptions are given in Table 4-2.1

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4 - Diagnosis and Troubleshooting

Table 4-2.1:Outdoor unit main PCB

Label in

Figure

4-2.1

Code

Content

Voltage

1

CN1

Pump 1 connection

0-220V AC(varying)

2

CN30

Power sequence detection connection

380V 3 S5

DIP switches

- 4 CN72

Power supply to user interface

9V DC 5 ENC1

Unit capacity dial switch

- 6 ENC3

Address dial switch

- 7 DSP1

Digital display

- 8 FUS1

Fuse

220V AC

9

CN43

Power input

220V AC

10

CN12_1,

CN12_2

Solenoid valve(SV4) drive ports

0-220V AC(varying)

11

IC25

Main control chip

-

12

CN64

Debug port

5V DC

13

CN16

Four-way valve drive port

0-220V AC(varying)

14

CN5,

CN5_1

Water side heat exchanger heater connections

0-220V AC(varying)

15

CN4,

CN4_1

Water flow switch heater connection

0-220V AC(varying)

16

CN3

CN3_1

Compressor crankcase heater connections

0-220V AC(varying)

17

CN49

Reserved communication port

2.5-2.7V DC

18

CN52

CN53

Fan inverter module communication ports

2.5-2.7V DC 19

CN50

CN51

Compressor inverter module communication ports

2.5-2.7V DC

20

CN55

EXV drive port

12V DC

21

CN60

CN71

Wired controller communication ports

2.5-2.7 DC 22

CN24

Outdoor ambient temperature sensor and air side heat exchanger refrigerant

outlet temperature sensor connections

0-5V DC (varying)

23

CN69

Water side heat exchanger anti-freezing temperature sensor 1, air side heat

exchanger refrigerant total outlet temperature sensor, discharge temperature

sensor 2 and discharge temperature sensor 1 connections

0-5V DC (varying)

24

CN31

Air suction temperature sensor, water side heat exchanger anti-freezing

temperature sensor 2, water side heat exchanger water outlet temperature

sensor, water side heat exchanger water inlet temperature sensor and combined

water outlet temperature sensor connections

0-5V DC (varying)

25

CN40

Pressure sensor connection

0-5V DC (varying)

26

CN41

CN42

Inverter module temperature sensor 1 and Inverter module temperature sensor 2

connections

0-5V DC (varying)

27

CN62

AC indicator A and AC indicator B connections

0-5V DC (varying)

28

CN65

Low pressure switch connection

0 or 5V DC (varying)

29

CN47

High pressure switch and discharge temperature switch (es) connections

0 or 5V DC (varying)

30

CN58

CN59

AC filter board communication ports

12V DC

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31

CN44

Water flow switch, additional control and Cool/heat connections

0 or 12V DC

32

IC10

EEPROM - 33

CN21

Remote alarm connection

On/off signal

34

CN19_N

Electric auxiliary heater N line connection

On/off signal

35

CN19_L

Electric auxiliary heater N line connection

On/off signal

36

CN2

Pump 2 connection

On/off signal

Table 4-2.2: Main PCB switch settings

Switch

Description

ON

OFF

Default factory

setting

S5

S5-1

Water outlet temperature1

Low

Normal

OFF

S5-2

ON/OFF function

Activated

Deactivated

OFF

S5-3

Water pump

One large pump

controlled by

master unit

One small

pump per

unit

OFF

S5-4

Reserved

- - OFF

ENC2

0: MC-SU30-RN1L

- - 0

3: MC-SU60-RN1L

- - 3

ENC1

0: master unit

1,2,3…F: slave units

-

0

-

Table 4-2.3: Function of buttons SW1 to SW4

Button

Function

SW3

Up

SW4

Down

SW5

Menu

SW5

Ok

Table 4-2.4: SW4 system check

Number

Parameters displayed on digital display

Remarks

0

Operating status

Standby: ODU address (DSP1 display) + number

of on-line units (DSP2 display)

On: display frequency

Defrosting: dF and operating frequency flash

alternately at 1s intervals frequency

OFF

ON

1 2 3 4

SW3

SW6

SW4

SW5

Main PCB field setting 2.2.1

Note:

1. Low water outlet temperature range: 0⁰C to 20⁰C; normal water outlet temperature range: 5⁰C to 20⁰C.

Function of buttons SW3 to SW6 2.2.2

SW2 system check button 2.2.3

Before pressing SW3 or SW4, allow the system to operate steadily for more than an hour. On pressing SW4, the parameters

listed in Table 4-2.4 will be displayed in sequence.

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4 - Diagnosis and Troubleshooting

Anti-freezing protection: Pb and operating

frequency flash alternately at 1s intervals

1

Outdoor unit address

Actual value = value displayed

2

Outdoor unit capacity

0:30KW; 3:60KW

3

Number of outdoor units (main unit display)

Actual value = value displayed

4

Unit capacity corrected for ambient temperature

Actual value = value displayed

5

Operating mode

8: Off; 0: Standby; 1: Cooling; 2: Heating

6

Fan A speed index

Refer to Note1

7

Fan B speed index

Refer to Note1

8

Air side heat exchanger refrigerant outlet temperature (sensor T3)

Actual value = value displayed

9

Outdoor ambient temperature (sensor T4)

Actual value = value displayed

10

Reserved

-

11

Water side heat exchanger anti-freezing temperature1 (sensor Taf1)

Actual value = value displayed

12

Water side heat exchanger anti-freezing temperature2 (sensor Taf2)

Actual value = value displayed

13

Total water outlet temperature(Tw)

Actual value = value displayed

14

Water inlet temperature(Twi, displays to decimal places)

Actual value = value displayed

15

Water outlet temperature(Two)

Actual value = value displayed

16

Air side heat exchanger refrigerant total outlet temperature (Tz/7)

Actual value = value displayed

17

Reserved

-

18

Compressor discharge temperature 1 (sensor Tp1)

Actual value = value displayed

19

Compressor discharge temperature 2 (sensor Tp2)

Actual value = value displayed

20

Compressor module temperature(Tf1)

Actual value = value displayed

21

Compressor module temperature(Tf2)

Actual value = value displayed

22

Air discharge superheat degree

Actual value = value displayed

23

Power supply phase B current

Actual value = value displayed

24

Power supply phase C current

Actual value = value displayed

25

Reserved

-

26

EXV 1 position

Steps=value displayed*4

27

Reserved

-

28

Compressor discharge pressure(in heating mode)

Actual value = value displayed

29

Compressor suction pressure (displays to decimal places in cooling mode)

Actual value = value displayed

30

Air suction superheat degree

Actual value = value displayed

31

Air suction temperature (Th)

Actual value = value displayed

32

Silent selection

Refer to Note2

33

Static pressure selection

0

34

Reserved

-

35

Reserved

-

36

Most recent error or protection code

“--”is displayed if no error or protection events

have occurred since start-up

37

Limit frequency number

0: no limits;

1: ambient temperature(T4) limit frequency;

2: voltage limit frequency;

3: air discharge limit frequency;

4: low voltage ratio;

5: instant limit frequency;

6: current limit frequency;

7: voltage limit frequency;

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Service Manual

8: pressure ratio and capacity demand

adjusting;

9: cooling low pressure limit frequency)

38

Defrosting process status

The first digit: T4 selection solution;

The second digit: scheme's range;

The third and fourth digits : defrosting time

39

EEPROM mismatch indicator:

1 : failure;

0 : no failure

40

Defrosting scheme

Actual value = value displayed

41

Initial frequency

Actual value = value displayed

42

Tc(+30)/Te(+25)

Actual value = value displayed

43

Online units statistic

Actual value = value displayed

44

Program version

Actual value = value displayed

45

---

-

Notes:

1. The fan speed index is related to the fan speed in rpm as described in Table 3-5.3 in Part 3, 5.6 “Outdoor Fan Control”.

2. Silent mode:  0: night silent mode; 1: silent mode; 2: super silent mode; 3: no silent mode.

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4 - Diagnosis and Troubleshooting

Table 4-2.5: Digital display output in different operating states

Outdoor unit state

Parameters displayed on DSP1

Parameters displayed on DSP2

Standby

0

1

Normal

operation

For single

compressor units

None

Running speed of compressor

For dual

compressor units

Running speed of compressor A in

rotations per second

Running speed of compressor B in

rotations per second

Error or protection

-- or placeholder

Error or protection code

System check

Refer to Table 4-2.4

DSP1

DSP2

Digital display output 2.2.4

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Figure 4-2.2: Compressor inverter module PCB

1

17

16

15

14

2

3

4

5

6

13 12 11 10 9 8 7

Notes:

1. Label descriptions are given in Table 4-2.6.

2.3 Compressor Inverter Module Board

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4 - Diagnosis and Troubleshooting

Table 4-2.6: Compressor inverter module PCB

Label in

Figure

4-2.2

Code

Content

Voltage

1

SW1

Inverter module address switch

- 2 IC14

EEPROM

-

3

CN9

CN10

Inverter module communication port

2.5-2.7V DC

4

W

Compressor connections

V

UV

= V

Uw

= VVW

0-380V AC

5 V 6 U 7

N

IPM module input port N

VPN= 540V DC

8

P

IPM module input port P

9

N2

IPM module protection port N2

V

P2N2

= 540V DC

10

P2

IPM module protection port P2

11

CN15

Power supply inverter module board

310V DC

12

N1

IPM module power supply port N1

V

P1N1

=540V DC

13

P1

IPM module power supply port P1

14

CN3

Three-phase bridge rectifier positive port

540V DC relative

to N

15

CN11

Three-phase bridge rectifier control port

15V DC

16

CN1

Reactor port

540V DC relative

to N

17

CN4

Capacity positive port

540V DC relative

to N

Table 4-2.7: Compressor inverter module PCB switch settings

Switch

Description

SW1

000: MC-SU30-RN1L compressor inverter module address setting

000: MC-SU60-RN1L compressor A inverter module address setting

001: MC-SU60-RN1L compressor B inverter module address setting

OFF

ON

1 2 3

Compressor Inverter Module PCB field setting 2.3.1

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Figure 4-2.3: Fan module PCB

1 2

7

6

5 4 3

Table 4-2.8: Fan module PCB

Label in

Figure

4-2.3

Code

Content

Voltage

1

CN2

EEPROGRAM

-

2

CN1

CN4

Communication port for inverter module

2.5-2.7 DC

3

P

Power supply for inverter module

V

PN

= 310V DC

4

CN3

Power supply for the fan motor

V

UV

= V

Uw

= VVW

0-310V AC

5

N

Power supply for inverter module

V

PN

= 310V DC

6

U3

IPM - 7

SW1

Address for the inverter module

-

Table 4-2.9: Fan module PCB switch settings

Switch

Description

SW1

SW1-1 SW1-2

00: MC-SU30-RN1L fan module address setting

00: MC-SU60-RN1L fan module A address setting

01: MC-SU60-RN1L fan module B address setting

SW1-3 SW1-4

Reserved

OFF

ON

1 2 3 4

2.4 Fan Module Board

Fan Module PCB field setting 2.4.1

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4 - Diagnosis and Troubleshooting

Figure 4-2.4: AC filter board1

12

11

10

9

8

1

2

3

4

5

6

5

6

7

Notes:

1. Label descriptions are given in Table 4-2.10.

2.5 AC Filter Board

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Table 4-2.10: MHC-V10(12, 14, 16)W/D2N1 outdoor unit main PCB for

refrigerant system

Label in

Figure

4-2.4

Code

Content

Voltage

1

CN39

N1

V

L1N1=VL2N1=VL3N1

=220V

V

CN38

L1 3 CN37

L2 4 CN36

L3

5

CN1

CN2

Power supply for compressor inverter module

310V DC

6

CN3

CN4

Power supply for fan inverter module

310V DC

7

CN6

AC filter board communication port

12 DC

8

CN40

L3’

V

L1’N1’=VL2’N1’=VL3’N1’

=220V

9

CN41

L2’

10

CN42

L1’

11

CN43

N1’

12

GND

-

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4 - Diagnosis and Troubleshooting

Error

code

Content

Remarks

1E0

Main PCB EEPROM mismatch

Displayed on main PCB and user interface

2E0

Inverter module A EEPROM mismatch

Displayed on main PCB and user interface

3E0

Inverter module B EEPROM mismatch

Displayed on main PCB and user interface

E1

Power phase sequence error

Displayed on main PCB and user interface

E2

Communication error between main PCB and wired

controller

Displayed on main PCB and user interface

E3

Total water outlet temperature sensor (Tw) error

(displayed on master unit only)

Displayed on main PCB and user interface

E4

Outlet water temperature sensor (Two) error

Displayed on main PCB and user interface

E5

Air-side heat exchanger temperature sensor (T3) error

Displayed on main PCB and user interface

E7

Outdoor ambient temperature sensor (T4) error

Displayed on main PCB and user interface

E9

Water flow failure

Displayed on main PCB and user interface

1Eb

Water-side heat exchanger anti-freezing temperature

sensor1 (Taf1) error

Displayed on main PCB and user interface

1Eb

Water-side heat exchanger anti-freezing temperature

sensor2 (Taf2) error

Displayed on main PCB and user interface

EC

Number of units detected by wired controller has

decreased

Displayed on main PCB and user interface

1Ed

Compressor discharge temperature sensor1 (Tp1) error

Displayed on main PCB and user interface

2Ed

Compressor discharge temperature sensor2 (Tp2) error

Displayed on main PCB and user interface

EF

Inlet water temperature sensor (Twi) error

Displayed on main PCB and user interface

EH

System self-check error

Displayed on main PCB and user interface

EP

Compressor discharge temperature sensor error

Displayed on main PCB and user interface

EU

Total cooling outlet temperature sensor (Tz/7) error

Displayed on main PCB and user interface

P0

Compressor discharge temperature protection

Displayed on main PCB and user interface

P1

Compressor suction temperature protection

Displayed on main PCB and user interface

P4

Power supply phase B Current protection

Displayed on main PCB and user interface

P5

Power supply phase C Current protection

Displayed on main PCB and user interface

1P6

System A inverter module protection

Displayed on main PCB and user interface

2P6

System A inverter module protection

Displayed on main PCB and user interface

P7

Condenser tube and Total cooling outlet high

temperature protection

Displayed on main PCB and user interface

P9

Water-side heat exchanger inlet/outlet temperature

difference protection

Displayed on main PCB and user interface

PA

Inlet water high temperature in cooling mode

Displayed on main PCB and user interface

Pb

System anti-freezing protection

Displayed on main PCB and user interface

PC

Evaporator pressure low in cooling mode

Displayed on main PCB and user interface

PE

Low-temperature protection of evaporator (manual

recovery)

Displayed on main PCB and user interface

PL

Module high temperature protection

Displayed on main PCB and user interface

1PU

DC fan 1 module protection

Displayed on main PCB and user interface

2PU

DC fan 2 module protection

Displayed on main PCB and user interface

3 Error Code Table

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1H0

System A IPM module Communication error

Displayed on main PCB and user interface

2H0

System B IPM module Communication error

Displayed on main PCB and user interface

H1

Under/Over voltage protection

Displayed on main PCB and user interface

1H6

System 1 DC bus voltage error

Displayed on main PCB and user interface

2H6

System 2 DC bus voltage error

Displayed on main PCB and user interface

Fb

Pressure sensor error

Displayed on main PCB and user interface

Fd

Air suction temperature(Th) protection error

Displayed on main PCB and user interface

1FF

DC fan 1 error

Displayed on main PCB and user interface

2FF

DC fan 2 error

Displayed on main PCB and user interface

FP

DIP inconsistency of multiple water pumps(Power

failure recovery required)

Displayed on main PCB and user interface

L0

Inverter module protection

-

L1

DC bus low voltage protection

-

L2

DC bus high voltage protection

-

L4

MCE error

-

L5

Zero speed protection

-

L7

Phase sequence error

-

L8

Compressor frequency variation greater than 15Hz

within one second protection

-

L9

Actual compressor frequency differs from target

frequency by more than 15Hz protection

-

dF

Defrosting indicator

Displayed on main PCB and user interface

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 All electrical work must be carried out by competent and suitably qualified, certified and

accredited professionals and in accordance with all applicable legislation (all national, local and other laws,

Power-off the outdoor units before connecting or disconnecting any connections or wiring, otherwise electric

shock (which can cause physical injury or death) may occur or damage to components may occur.

Warning

4 Troubleshooting

4.1 Warning

standards, codes, rules, regulations and other legislation that apply in a given situation).



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E0

Main PCB or IPM inverter module

EEPROM1 is not connected properly

Yes

Ensure the EEPROM is connected

properly

No

EEPROM damaged

Yes

Replace the EEPROM

No

Replace refrigerant system Main PCB or

IPM inverter module

4.2 E0 Troubleshooting

Digital display output 4.2.1

Description 4.2.2

 1E0 indicates main PCB EEPROM error.  2E0 indicates IPM inverter module (compressor A) EEPROM error.  3E0 indicates IPM inverter module (compressor B) EEPROM error.  All units stop running.  Error code is displayed on main PCB and user interface...d user interface.

Possible causes 4.2.3

 Main PCB or IPM inverter module EEPROM is not connected properly.  Main PCB or IPM inverter module damaged.  EEPROM damaged.

Procedure 4.2.4

Notes:

1. Main PCB EEPROM is designated IC10 on the main PCBs (labeled 32 in Figure 4-2.1 in Part 4, 2.2 “Main PCB”).

2. Compressor inverter module PCB EEPROM is designated IC14 on compressor inverter module PCB (labeled 2 in Figure 4-2.2 in Part 4, 2.3 “Compressor

inverter module PCB”).

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4.3 E1 Troubleshooting

Digital display output 4.3.1

Description 4.3.2

 Phase sequence error.  Unit stops running.  Error code is displayed on main PCB and user interface.

Possible causes 4.3.3

 Power supply phases not connected in correct sequence.  Power supply terminals loose.  Power supply abnormal.  Main PCB damaged.

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E1

The phase sequence of the 3-phase

power supply is incrorrect1

Yes

Exchange any two of the 3 phase wires

No

Some power supply terminals are loose2

Yes

Ensure all supply terminals are securely

fastened

No

The power supply is abnormal

Yes

Check the power supply equipment

No

Replace refrigerant system main PCB

Procedure 4.3.4

Notes:

1. The A, B, C terminals of 3-phase power supply should match compressor phase sequence requirements. If the phase sequence is inverted, the compressor

will operate inversely. If the wiring connection of each outdoor unit is in A, B, C phase sequence, and multiple units are connected, the current difference between C phase and A, B phases will be very large as the power supply load of each outdoor unit will be on C phase. This can easily lead to tripped circuits and terminal wiring burnout. Therefore if multiple units are to be used, the phase sequence should be staggered, so that the current is distributed among the three phases equally.

2. Loose power supply terminals can cause the compressors to operate abnormally and compressor current to be very large.

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4.4 E2 Troubleshooting

Digital display output 4.4.1

Description 4.4.2

 Communication error between outdoor unit and user interface.  All units stop running.  Error code is displayed on main PCB and user interface.

Possible causes 4.4.3

 Communication wires between outdoor unit and user interface not connected properly.  Communication wiring P Q E terminals misconnected.  Loosened wiring within electric control box.  Interference from high voltage wires or other sources of electromagnetic radiation.  Communication wire too long.  Damaged main PCB, user interface or electric control box communication terminals block.

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E2

Communication wires P Q E have short

circuited, disconnected or are

misconnected1

Yes

Reconnect the communication wires

No

Communication wires P Q E are not

connected in a daisy chain

Yes

Connect the communication wires in a

daisy chain

No

Wires between outdoor main PCB and

electric control box communication

terminals block are loose

Yes

Ensure the wires are connected properly

No

Interference from high voltage (220V or

higher) wires

Yes

Ensure the communication wires and

high voltage wires are separated

No

Communication wires are close to a

source of electromagnetic radiation such

as transformer or strong fluorescent lamp

Yes

Remove the source of interference, or

add additional shielding to the

communication wires

No

Damaged control box communication

terminals block

Yes

Replacing electric control box

communication terminals block resolves

the error

No

The length of communication wire is over

1200m

Yes

Reduce the wire length to less than

1200mm or strengthen the signal

No

Replace main PCB or user interface

Procedure 4.4.4

Notes:

1. Measure the resistance among P, Q and E. The normal resistance between P and Q is 120Ω, between P and E is infinite, between Q and E is infinite.

Communication wiring has polarity. Ensure that the P wire is connected to P terminals and the Q wire is connected to Q terminals.

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4.5 E3, E4, E5, E7, Eb, Ed, EF, EP, EU, Fb, Fd Troubleshooting

Digital display output 4.5.1

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Description 4.5.2

 E3 indicates a combined water outlet temperature sensor error.  E4 indicates a water outlet temperature sensor error.  E5 indicates an air side heat exchanger refrigerant outlet temperature sensor error.  E7 indicates an outdoor ambient temperature sensor error.  1Eb indicates a water side heat exchanger anti-freezing temperature sensor 1 error.  2Eb indicates a water side heat exchanger anti-freezing temperature sensor 2error.  1Ed indicates a discharge pipe temperature sensor 1 error.  2Ed indicates a discharge pipe temperature sensor 2 error.  EF indicates a water inlet temperature sensor error.  EP indicates a discharge pipe temperature sensor failure alarm.  EU indicates an air side heat exchanger refrigerant total outlet temperature sensor error.  Fb indicates a pressure sensor error.  Fd indicates an air suction temperature sensor error.  All stop running.  Error code is displayed on main PCB and user interface.

Possible causes 4.5.3

 Temperature sensor or pressure sensor not connected properly or has malfunctioned.  Damaged main PCB.

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E3 / E4 / E5 / E7 / Eb / Ed / EF / EP / EU /

Fb / Fd

Temperature sensor or pressure sensor

connection on main PCB is loose

Yes

Ensure the sensor is connected properly

No

Temperature or pressure sensor has

short-circuited or failed2

Yes

Replace the sensor

No

Replace main PCB

Procedure 4.5.4

Notes:

1. All the sensors are connected to port CN24, CN69, CN31 and CN40 on the main PCB (labeled 22, 23, 24, 25 in Figure 4-2.1 in Part 4, 2.2 “Outdoor unit main

PCB”).

2. Measure sensor resistance. If the resistance is too low, the sensor has short-circuited. If the resistance is not consistent with the sensor’s resistance

characteristics table, the sensor has failed. Refer to Table 4-5.1 or 4-5.2 in Part 4, 5.1 “Temperature Sensor Resistance Characteristics”.

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4.6 E9 Troubleshooting

Digital display output 4.6.1

Description 4.6.2

 Water flow failure.  E9 indicates a water flow switch error. When an E9 error occurs 3 times in 60 minutes, a manual system restart is

required before the system can resume operation.

 All units stop running.  Error code is displayed on main PCB and user interface.

Possible causes 4.6.3

 The wire circuit is short connected or open.  Water flow rate is too low.  Water flow switch damaged.  Damaged main PCB.

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E9

Water flow switch connection on main

PCB is loose1

Yes

Ensure the switch is connected properly

No

Water flow is insufficient2

Yes

Check the water piping and valves. Make

sure the water piping is clean, there is no

air in the water piping and all valves are

open. Make sure the water pump

capacity is enough.

No

Water flow switch is damaged

Yes

Replace the water flow switch

No

Replace main PCB

Procedure 4.6.4

Note:

1. Water flow switch connection is port CN44 on the main PCB (labeled 31 in Figure 4-2.1 in Part 4, 2.2 “Outdoor unit main PCB”).

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4.7 EC Troubleshooting

Digital display output 4.7.1

Description 4.7.2

 EC indicates that the number of slave units detected by master unit has decreased.  All units stop running.  Error code is only displayed on the user interface.

Possible causes 4.7.3

 Some outdoor units are powered off.  Power supply abnormal.  Incorrect outdoor unit address setting.  Communication wires between outdoor units not connected properly.  Loosened wiring within electric control box.  Damaged main PCB or electric control box communication terminals block.

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EC

Some outdoor units in the system are

powered off1

Yes

Power on all the outdoor units

No

The power supply is abnormal

Yes

Check the power supply equipment

No

Troubleshoot as for an E2 error2

Procedure 4.7.4

Notes:

1. Check digital display on the main PCB. If digital display is on, the main PCB is powered on, if digital display is off, the main PCB is powered off. Refer to

Figure 4-2.1 in Part 4, 2.2 “Outdoor unit main PCB”.

2. See Part 4, 4.4 “E2 Troubleshooting”.

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4.8 EH Troubleshooting

Digital display output 4.8.1

Description 4.8.2

 EH indicates system self-check in the factory, it will not display in the normal operating.

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4.9 P0 Troubleshooting

Digital display output 4.9.1

Description 4.9.2

 Discharge pipe high pressure or discharge temperature switch protection. When the discharge pressure rises above

4.4MPa or discharge temperature rises above 115°C , the system displays P0 protection and all units stop running.

When the discharge pressure falls below 3.2MPa or discharge temperature fall below 75°C , P0 is removed and normal

operation resumes. When P0 error occurs 5 times in 120 minutes, a manual system restart is required before the

system can resume operation.

 Error code is displayed on main PCB and user interface.

Possible causes 4.9.3

 High pressure switch or discharge temperature switch not connected properly or has malfunctioned.  Excess refrigerant.  System contains air or nitrogen.  High pressure side blockage.  Poor condenser heat exchange.  Main PCB damaged.

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P0

High pressure switch or discharge

temperature switch connection on main

PCB is loose1

Yes

Ensure High pressure switch or discharge

temperature switch are connected

properly

No

High pressure switch or discharge

temperature switch have short-circuited

or failed2

Yes

Replace the high pressure switch or

discharge temperature switch

No

The high pressure side is blocked, caused

by crushed or bent pipe or blocked EXV3

Yes

Inspect the system and fix the error

No

The heat exchange is poor4

Yes

Inspect the system and fix the error

No

The water flow rate is not sufficient in

cooling mode

Yes

Inspect the water system and fix the

error

No

Replace outdoor main PCB

Procedure 4.9.4

Notes:

1. High pressure switch connection is port CN47 on the main PCB (labeled 29 in Figure 4-2.1 in Part 4, 2.2 “Outdoor unit main PCB”).

2. Measure the resistance among the three terminals of the pressure sensor. If the resistance is of the order of mega Ohms or infinite, the pressure sensor

has failed.

3. High pressure side blockage causes discharge temperature to be higher than normal, discharge pressure to be higher than normal and suction pressure to

be lower than normal.

4. In heating mode check water side heat exchanger, water piping, circulator pumps and water flow switch for dirt/blockages. In cooling mode check air side

heat exchanger, fan(s) and air outlets for dirt/blockages.

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4.10 P1 Troubleshooting

Digital display output 4.10.1

Description 4.10.2

 P1 indicates suction pipe low pressure protection. When the suction pressure falls below 0.05MPa, the system

displays P1 protection and all units stop running. When the pressure rises above 0.15MPa, P1 is removed and normal

operation resumes. When P1 error occurs 5 times in 120 minutes, a manual system restart is required before the

system can resume operation.

 Error code is displayed on main PCB and user interface.

Possible causes 4.10.3

 Low pressure switch not connected properly or has malfunctioned.  Insufficient refrigerant.  Low pressure side blockage.  Poor evaporator heat exchange in heating mode.  Insufficient water flow in cooling mode.  Main PCB damaged.

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P1

Insufficient refrigerant caused by

refrigerant leakage1

Yes

Add refrigerant or inspect the system for

leaks

No

The low pressure side is blocked, caused

by crushed or bent pipe, blocked EXV, or

dirty filter2

Yes

Inspect the system and fix the error. If the

filter is blocked by ice, the piping should

be cleaned

No

The air side heat exchanger heat

exchange is poor in heating mode3

Yes

Inspect the refrigerant system and fix the

error

No

The water flow rate is not sufficient in

cooling mode4

Yes

Inspect the water system and fix the

error

No

Replace main PCB

Procedure 4.10.4

Notes:

1. To check for insufficient refrigerant:  An insufficiency of refrigerant causes compressor discharge temperature to be higher than normal, discharge and suction pressures to be lower than

normal and compressor current to be lower than normal, and may cause frosting to occur on the suction pipe. These issues disappear once

2. A low pressure side blockage causes compressor discharge temperature to be higher than normal, suction pressure to be lower than normal and

3. Check air side heat exchanger, fan(s) and air outlets for dirt/blockages.

4. Check water side heat exchanger, water piping, circulator pumps and water flow switch for dirt/blockages.

sufficient refrigerant has been charged into the system.

compressor current to be lower than normal, and may cause frosting to occur on the suction pipe. For normal system parameters.

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4.11 P4, P5 Troubleshooting

Digital display output 4.11.1

Description 4.11.2

 P4 indicates current protection on Phase B.  P5 indicates current protection on Phase C.  When the compressor current rises above the protection value 25A, the system displays P3 or P4 protection and all

units stop running. When the current returns to the normal range, P3 or P4 is removed and normal operation

resumes. When P3 or P4 error occurs 5 times in 120 minutes, a manual system restart is required before the system

can resume operation.

 Error code is displayed on main PCB and user interface.

Possible causes 4.11.3

 Power supply abnormal.  Poor condenser heat exchange.  High pressure side blockage.  Excess refrigerant.  System contains air or nitrogen.  Inverter module damaged.  Compressor damaged.  Main PCB damaged.

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P4/P5

The power supply is abnormal

Yes

Check the power supply equipment

No

Excess refrigerant

Yes

Discharge part of the refrigerant. Add oil

if it leaks during dishcarge

No

System contains air or nitrogen

Yes

Flush all refrigerant then vacuum the

system and recharge refrigerant. Add oil

to the system if it leaks

No

The condenser heat exchange is poor1

Yes

Inspect the system and fix the error

No

The high pressure side is blocked, caused

by crushed or bent pipe or blocked EXV2

Yes

Inspect the system and fix the error

No

Inverter module has short-circuited3

Yes

Replace the inverter module

No

Compressor has malfunctioned4

Yes

Replace the compressor

No

Replace outdoor main PCB

Procedure 4.11.4

Notes:

1. In heating mode check water side heat exchanger, water piping, circulator pumps and water flow switch for dirt/blockages. In cooling mode check air side

heat exchanger, fan(s) and air outlets for dirt/blockages.

2. High pressure side blockage causes discharge temperature to be higher than normal, discharge pressure to be higher than normal and suction pressure to

be lower than normal.

3. Set a multi-meter to buzzer mode and test any two terminals of P N and U V W of the inverter module. If the buzzer sounds, the inverter module has

short-circuited.

4. The normal resistances of the inverter compressor are 0.7-1.5Ω among U V W and infinite between each of U V W and ground. If any of the resistances

differ from these specifications, the compressor has malfunctioned.

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4.12 P6 Troubleshooting

Digital display output 4.12.1

Description 4.12.2

 1P6 indicates compressor A inverter module protection.  2P6 indicates compressor B inverter module protection.  When a P6 error occurs, a manual system restart is required before the system can resume operation. The cause of a

P6 error should be addressed promptly in order to avoid system damage.

 All units stop running.  Error code is displayed on the main PCB and user interface.

Possible causes 4.12.3

 Inverter module protection.  DC bus low or high voltage protection.  MCE error.  Zero speed protection.  Phase sequence error.  Excessive compressor frequency variation.  Actual compressor frequency differs from target frequency.

Specific error codes for xH4 inverter module protection 4.12.4

If a P6 error code is displayed, press button SW3 (to No.36 item) until one of the following specific error codes is displayed

on the digital display: xL0, xL1, xL2, xL4, xL5, xL7, xL8, xL9. Refer to Figure 5-4.3 and Table 5-4.1.

Figure 4-4.1: Button SW3 on main PCB

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Table 4-4.1: Specific error codes for error xH4

Specific error code1

Content

xL0

Inverter module protection

xL1

DC bus low voltage protection

xL2

DC bus high voltage protection

xL4

MCE error

xL5

Zero speed protection

xL7

Phase sequence error

xL8

Compressor frequency variation greater than 15Hz within one second protection

xL9

Actual compressor frequency differs from target frequency by more than 15Hz protection

Notes:

1. 'x' is a placeholder for the compressor system (compressor and related electrical components), with 1 representing compressor system A and

2 representing compressor system B.

Table 5-4.2: Errors indicated on LED4/6

LED4/6 flashing pattern

Corresponding error

Flashes 8 times and stops for 1 second, then repeats

xL0 - Inverter module protection

Flashes 9 times and stops for 1 second, then repeats

xL1 - DC bus low voltage protection

Flashes 10 times and stops for 1 second, then repeats

xL2 - DC bus high voltage protection

Flashes 12 times and stops for 1 second, then repeats

xL4 - MCE error

The specific error codes xL0, xL1, xL2 and xL4 cjcled5

n also be obtained from the inverter module LED indicators. If an inverter module error has occurred, LED5 is continuously

on and LED4 flashes. Refer to Figure 5-4.4 and Table 5-4.2.

Figure 4-4.2: LED indicators LED4 and LED5 on main PCB

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Figure 4-4.4: Measuring resistances among compressor

terminals

Figure 4-4.5: Measuring resistances between compressor terminals

and ground

Inverter module N terminal

DC bus wire

Current sensor

DC filter board N

terminal

First troubleshooting step 4.12.5

To troubleshoot XP6 errors, first ensure that the DC bus wire is connected correctly. The DC bus wire should run from the N

terminal on the inverter module, through the current sensor (in the direction indicated by the arrow on the current

sensor), and end at the N terminal on the DC filter board.

Figure 4-4.3: DC detection wire connection method

xL0 troubleshooting 4.12.6

Step 1: Check compressor

 Check that compressor wiring is all connected properly.  The normal resistances of the inverter compressor are 0.7-1.5Ω among U V W and infinite between each of U V W

and ground. If any of the resistances differ from these specifications, the compressor has malfunctioned.

 If the resistances are normal, go to Step 2.

Step 2: Check inverter module

 The DC voltage between terminals P1 and N1 should be 1.41 times the local power supply voltage. The DC voltage

between terminals P and N should be 510-580V. If either voltage is not in the normal range, troubleshoot as for xL1 or

xL2 errors. Refer to Part 4, 4.12.7 “xL1/xL4 troubleshooting” or Part 4, 4.12.8 “xL2 troubleshooting”.

 Disconnect the terminals U, N, W from the inverter compressor. Measure the resistance among terminals P, N, U, V, W.

All the resistances should be infinite. If any of them are not infinite, the inverter module is damaged and should be

replaced.

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Figure 4-4.6: Inverter module terminals

Figure 4-4.7: Inverter module terminals

Figure 4-4.8: Rectifier and AC filter board in electric control box

P1

N1 N U P V W N

P

Check 3-phase bridge

rectifier wiring

Check AC filter

board wiring

xL1/xL4 troubleshooting 4.12.7

Step 1: Check inverter module

 Check the DC voltage between terminals P and N. The normal value is 510-580V. If the voltage is lower than 510V, go

to Step 2.

Step 2: Check rectifier wiring circuit

 If the wires are loose, fasten the wires. If the wires are OK, replace the main PCB.

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Figure 4-4.9: Inverter module terminals

Figure 4-4.10: Inverter module terminals

N P P

N

xL2 troubleshooting 4.12.8

Step 1: Check inverter module

 Check the DC voltage between terminals P and N. The normal value is 510-580V, if the voltage is higher than 580V, go

to Step 2.

Step 2: Check inverter module

 Check the voltage between terminals P and N on the capacitor board. The normal value is 510-580V. If the voltage is

not in the normal range, there is a problem with the electrolytic capacitor power supply. Check the power supply for

high or unstable voltage. If the power supply voltage value is normal, then the main PCB has malfunctioned and

needs to be replaced.

xL8/xL9 troubleshooting 4.12.9

Step 1: Check compressor

 The normal resistances of the inverter compressor are 0.7-1.5Ω among U V W and infinite between each of U V W

and ground. If any of the resistances differ from these specifications, the compressor has malfunctioned.

 Refer to Figures 4-4.4 and 4-4.5 in Part 4, 4.12.6 “xL0 troubleshooting”. If the resistance values are normal, go to Step

2.

Step 2: Check compressor and main PCB

 If there is another unit nearby (either in the same system or another system) that is operating normally, its electric

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Unit with error

Unit operating normally

Figure 4-4.12: Draining oil from a compressor

Power line (U, V, W terminals)

control box can be used to determine whether the xL8/xL9 error is being caused by a compressor fault or a main PCB

fault:

 If using another unit in the same system as the unit with the error to perform the test, set it as the master unit

(address 0); if using a unit in another system, use the master unit.

 Disconnect the power wires of the compressor referenced in the xL8/xL9 error code.  In the unit that is operating normally, disconnect the power wires that connect a compressor to the electric

control box and use them to connect the compressor with the xL8/xL9 error to the electric control box of the

unit that is operating normally. Ensure that the U, V, W terminals are connected in the right order, and then start

the system that is operating normally.

 If the compressor with the xL8/xL9 error runs normally, replace the main PCB of the unit with the xL8/xL9 error

and ensure the wiring is correct; if the compressor with the xL8/xL9 error still does not run normally, it needs to

be replaced. Refer to Part 4, 4.12.10 “Compressor replacement procedure”.

Figure 4-4.11: Connecting compressor to an error-free unit

 If there is no error-free unit nearby:

 Replace the main PCB of the unit with the xL8/xL9 error and ensure the wiring is correct. If the compressor with

the xL8/xL9 error runs normally, a fault with the main PCB was causing the xL8/xL9 error; if the compressor with

the xL8/xL9 error still does not run normally, it needs to be replaced. Refer to Part 4, 4.12.10 “Compressor

replacement procedure”.

Compressor replacement procedure 4.12.10

Step 1: Remove faulty compressor and remove oil

 Remove the faulty compressor from the outdoor unit.  Before removing the oil, shake the compressor so as to not allow

impurities to remain settled at the bottom.

 Drain the oil out of the compressor and retain it for inspection.

Normally the oil can be drained out from the compressor discharge

pipe. Refer to Figure 4-4.12.

Step 2: Inspect oil from faulty compressor

 The oil should be clear and transparent. Slightly yellow oil is not an indication of any problems. However, if the oil is

dark, black or contains impurities, the system has problems and the oil needs to be changed. Refer to Figure 5-4.16

for further details regarding inspecting compressor oil. (If the compressor oil has been spoiled, the compressor will

not be being lubricated effectively. The scroll plate, crankshaft and bearings will wear. Abrasion will lead to a larger

load and higher current. More electric energy will get dissipated as heat and the temperature of the motor will

become increasingly high. Finally, compressor damage or burnout will result. Refer to Figure 4-4.13.)

Step 3: Check oil in other compressors in the system

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Figure 4-4.13: Inspecting compressor oil

This oil is black

- it has been

carbonized

This oil is a little

yellow, but is clear

and transparent and

the condition is

acceptable

This oil is still

transparent but there

are impurities which

may clog the filter

 If the oil drained from the faulty compressor is clean, go to Step 6.  If the oil drained from the faulty compressor is only lightly spoiled, go to Step 4.  If the oil drained from the faulty compressor is heavily spoiled, check the oil in the other compressors in the system.

Drain the oil from any compressors where the oil has been spoiled. Go to Step 4.

Step 4: Replace oil separator(s) and accumulator(s)

 If the oil from a compressor is spoiled (lightly or heavily), drain the oil from the oil separator and accumulator in that

unit and then replace them.

Step 5: Check filters(s)

 If the oil from a compressor is spoiled (lightly or heavily), check the filter between the gas stop valve and the 4-way

valve in that unit. If it is blocked, clean with nitrogen or replace.

Step 6: Replace the faulty compressor and re-fit the other compressors

 Replace the faulty compressor.  If the oil had been spoiled and was drained from the non-faulty compressors in Step 3, use clean oil to clean them

before re-fitting them into the units. To clean, add oil into the compressor through the discharge pipe using a funnel,

shake the compressor, and then drain the oil. Repeat several times and then re-fit the compressors into the units.

Step 7: Add compressor oil

 Add 2L of oil to the new compressor through the discharge pipe, using a funnel.  Add 2L of oil to each of the compressors from which oil was drained in Step 3.  Only use FV68H oil. Different compressors require different types of oil. Using the wrong type of oil leads to various

problems.

 Add additional oil to the accumulators such that the total amount of oil is 4.6L .

Step 8: Vacuum drying and refrigerant charging

 Once all the compressors and other components have been fully connected, vacuum dry the system and recharge

refrigerant.

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Cloudy or gray

oil indicates

abnormal

system

operation

This oil contains

particles of copper

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4.13 P7 Troubleshooting

Digital display output 4.13.1

Description 4.13.2

 High temperature protection of air side heat exchanger refrigerant outlet temperature sensor or air side heat

exchanger refrigerant total outlet temperature sensor in cooling mode. When the air side heat exchanger refrigerant

outlet temperature is higher than 65°C or air side heat exchanger refrigerant total outlet temperature is higher than

62°C for more than 3 seconds, the system displays P7 protection and all units stop running. When the air side heat

exchanger refrigerant outlet temperature returns drops below 52°C , P7 is removed and normal operation resumes.

 All units stop running.  Error code is displayed on main PCB and user interface.

Possible causes 4.13.3

 Air side heat exchanger refrigerant outlet temperature sensor or air side heat exchanger refrigerant total outlet

temperature sensor not connected properly or has malfunctioned.

 Fan motor wiring connection is wrong.  Poor condenser heat exchange.  Fan motor damaged.  Main PCB damaged.

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P7

Air side heat exchanger refrigerant outlet

temperature sensor or air side heat

exchanger refrigerant total outlet

temperature sensor is loose1

Yes

Ensure the temperature sensor is

connected properly

No

Fan motor wiring connection is

wrong

Yes

Ensure fan motor wiring is

connected properly

No

Air side heat exchanger refrigerant outlet

temperature sensor or air side heat

exchanger refrigerant total outlet

temperature sensor has short-circuited

or failed2

Yes

Replace the temperature sensor

No

The air side heat exchanger heat

exchange is poor3

Yes

Inspect the system and fix the error

No

The fan or fan motor is blocked or

damaged

Yes

Inspect the system and fix the error

No

Replace outdoor main PCB

Procedure 4.13.4

Notes:

1. Air side heat exchanger refrigerant outlet temperature sensor and air side heat exchanger refrigerant total outlet temperature sensor connection port is

CN24 and CN69 on the main PCB (labeled 22 and 23 in Figure 4-2.1 in Part 4, 2.2 “Outdoor unit main PCB”).

2. Measure sensor resistance. If the resistance is too low, the sensor has short-circuited. If the resistance is not consistent with the sensor’s resistance

characteristics table, the sensor has failed. Refer to Table 4-5.1 in Part 4, 5.1 “Temperature Sensor Resistance Characteristics”.

3. Check air side heat exchanger, fan(s) and air outlets for dirt/blockages.

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4.14 P9 Troubleshooting

Digital display output 4.14.1

Description 4.14.2

 High temperature difference between water side heat exchanger water inlet and water outlet temperatures

protection.

 All units stop running.  Error code is displayed on main PCB and user interface.

Possible causes 4.14.3

 Temperature sensor not connected properly or has malfunctioned.  Water piping contains air.  Insufficient water flow.  Main PCB damaged.

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P9

Water side heat exchanger water inlet /

outlet temperature sensor is loose1

Yes

Ensure the temperature sensor is

connected properly

No

Water side heat exchanger water inlet /

outlet temperature sensor has

short-circuited or failed2

Yes

Replace the temperature sensor

No

Water piping contains air

Yes

Purge air from the water system

No

The water flow rate is not sufficient,

caused by crushed or bent water piping,

pump capacity or high resistance in water

piping

Yes

Inspect the system and fix the error

No

Replace outdoor main PCB

Procedure 4.14.4

Notes:

1. Water side heat exchanger water inlet temperature sensor and water side heat exchanger water outlet temperature sensor connections are port CN31 on

the main PCB (labeled 24 in Figure 4-2.1 in Part 4, 2.2 “Outdoor unit main PCB”).

2. Measure sensor resistance. If the resistance is too low, the sensor has short-circuited. If the resistance is not consistent with the sensor’s resistance

characteristics table, the sensor has failed. Refer to Table 4-5.1 in Part 5, 5.1 “Temperature Sensor Resistance Characteristics”.

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Pb

Min(Tw/Two/Twi/Taf) ≤ 4°C in normal

cooling mode or min(Tw/Two/Twi/Taf) ≤

0°C in low water outlet mode1

Yes

Normal system protection. The system

will resume automatically2

No

Tw/Two/Twi/Taf temperature sensor

loose

Yes

Ensure the temperature sensor is

connected properly

No

Tw/Two/Twi/Taf temperature sensor has

short-circuited or failed3

Yes

Replace the temperature sensor

No

Replace outdoor main PCB

4.15 Pb Troubleshooting

Digital display output 4.15.1

Description 4.15.2

 Water side heat exchanger anti-freeze protection.  All units stop running.  Error code is displayed on main PCB and ANTI.FREEZE icon is displayed on user interface.

Possible causes 4.15.3

 Normal system protection.  Temperature sensor not connected properly or has malfunctioned.  Main PCB damaged.

Procedure 4.15.4

Notes:

1. Combined water outlet temperature sensor (Tw), Water side heat exchanger water outlet temperature sensor(Two), water side heat exchanger water inlet

temperature sensor (Twi) and water side heat exchanger anti-freezing temperature sensor(Taf, include Taf1 and Taf2) connections are ports CN69 and CN31 on the main PCB (labeled 23 and 24 in Figure 4-2.1 in Part 4, 2.2 “Outdoor unit main PCB”).

2. Refer to Part 3, 6.7 “Water Side Heat Exchanger Anti-freeze Protection Control”.

3. Measure sensor resistance. If the resistance is too low, the sensor has short-circuited. If the resistance is not consistent with the sensor’s resistance

characteristics table, the sensor has failed. Refer to Table 4-5.1 in Part 5, 5.1 “Temperature Sensor Resistance Characteristics”.

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4.16 PC Troubleshooting

Digital display output 4.16.1

Description 4.16.2

 Water side heat exchanger low pressure protection.  All units stop running.  Error code is displayed on main PCB and user interface.

Possible causes 4.16.3

 Low pressure switch not connected properly or has malfunctioned.  Insufficient refrigerant.  Low pressure side blockage.  Poor evaporator heat exchange in heating mode.  Insufficient water flow in cooling mode.  Main PCB damaged.

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PC

Low pressure sensor connection on main

PCB is loose1

Yes

Ensure the sensor is connected properly

No

Low pressure sensor has short-circuited

or failed2

Yes

Replace the sensor

No

Insufficient refrigerant caused by

refrigerant leakage3

Yes

Add refrigerant or inspect the system for

leaks

No

The low pressure side is blocked, caused

by crushed or bent pipe, blocked EXV, or

dirty filter4

Yes

Inspect the system and fix the error. If the

filter is blocked by ice, the piping should

be cleaned

No

The air side heat exchanger heat

exchange is poor in heating mode5

Yes

Inspect the refrigerant system and fix the

error

No

The water flow rate is not sufficient in

cooling mode6

Yes

Inspect the water system and fix the

error

No

Replace main PCB

Procedure 4.16.4

Notes:

1. Low pressure sensor connection is port CN40 on the main PCB (labeled 25 in Figure 4-2.1 in Part 4, 2.2 “Outdoor unit main PCB”) .

2. Measure the resistance among the three terminals of the pressure sensor. If the resistance is of the order of mega Ohms or infinite, the pressure sensor

has failed.

3. To check for insufficient refrigerant: An insufficiency of refrigerant causes compressor discharge temperature to be higher than normal, discharge and

suction pressures to be lower than normal and compressor current to be lower than normal, and may cause frosting to occur on the suction pipe. These issues disappear once sufficient refrigerant has been charged into the system.

4. A low pressure side blockage causes compressor discharge temperature to be higher than normal, suction pressure to be lower than normal and

compressor current to be lower than normal, and may cause frosting to occur on the suction pipe. For normal system parameters.

5. Check air side heat exchanger, fan(s) and air outlets for dirt/blockages.

6. Check water side heat exchanger, water piping, circulator pumps and water flow switch for dirt/blockages.

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4.17 PE Troubleshooting

Digital display output 4.17.1

Description 4.17.2

 Water side heat exchanger low temperature protection.  All units stop running.  Error code is displayed on main PCB and user interface.

Possible causes 4.17.3

 Temperature sensor not connected properly or has malfunctioned.  Insufficient refrigerant.  Low pressure side blockage.  Poor evaporator heat exchange in heating mode.  Insufficient water flow in cooling mode.  Main PCB damaged.

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PE

Taf temperature sensor connection on

main PCB is loose1

Yes

Ensure the sensor is connected properly

No

Taf temperature sensor has

short-circuited or failed2

Yes

Replace the sensor

No

Insufficient refrigerant caused by

refrigerant leakage3

Yes

Add refrigerant or inspect the system for

leaks

No

The low pressure side is blocked, caused

by crushed or bent pipe, blocked EXV, or

dirty filter4

Yes

Inspect the system and fix the error. If the

filter is blocked by ice, the piping should

be cleaned

No

The air side heat exchanger heat

exchange is poor in heating mode5

Yes

Inspect the refrigerant system and fix the

error

No

The water flow rate is not sufficient in

cooling mode6

Yes

Inspect the water system and fix the

error

No

Replace main PCB

Procedure 4.17.4

Notes:

1. Water side heat exchanger anti-freezing temperature sensor (Taf, include Taf1 and Taf2) connection are ports CN69 and CN31 on the main PCB (labeled 23

and 24 in Figure 4-2.1 in Part 4, 2.2 “Outdoor unit main PCB” ).

2. Measure sensor resistance. If the resistance is too low, the sensor has short-circuited. If the resistance is not consistent with the sensor’s resistance

characteristics table, the sensor has failed. Refer to Part 2, 1 “Layout of Functional Components” and to Table 4-5.3 in Part 4, 5.1 “Temperature Sensor Resistance Characteristics”.

3. To check for insufficient refrigerant: an insufficiency of refrigerant causes compressor discharge temperature to be higher than normal, discharge and

suction pressures to be lower than normal and compressor current to be lower than normal, and may cause frosting to occur on the suction pipe. These issues disappear once sufficient refrigerant has been charged into the system.

4. A low pressure side blockage causes compressor discharge temperature to be higher than normal, suction pressure to be lower than normal and

compressor current to be lower than normal, and may cause frosting to occur on the suction pipe. For normal system parameters.

5. Check air side heat exchanger, fan(s) and air outlets for dirt/blockages.

6. Check water side heat exchanger, water piping, circulator pumps and water flow switch for dirt/blockages.

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4.18 PL Troubleshooting

Digital display output 4.18.1

Description 4.18.2

 PL indicates inverter module temperature protection. When the main inverter module temperature rises above 82

the system displays PL protection and all the units stop running. When the inverter module temperature drops below

60°C, the compressor enters re-start control

 When a PL error occurs 3 times in 100 minutes, a manual system restart is required before the system can resume

operation.

 Error code is displayed on the main PCB and user interface.

Possible causes 4.18.3

 Blocked, dirty or loose heat sink.  Temperature sensor not connected properly or has malfunctioned.  Fan motor wiring connection is wrong.  Main PCB damaged.

o

C,

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PL

The inverter module heat sink is blocked

or dirty1

Yes

Clean or replace the heat sink

No

The screws connecting the heat sink to

the inverter module are loose2

Yes

Tighten the screws and make sure the

heat sink is well-connected

No

Inverter module temperature sensor

connection on main PCB is loose3

Yes

Ensure the sensor is connected properly

No

Inverter module temperature sensor has

short circuited or failed4

Yes

Replace the sensor

No Fan motor wiring connection is wrong

Yes

Check the fan motor wiring connection

No

Replace outdoor main PCB

Procedure 4.18.4

Notes:

1. Refer to Figures 4-1.2 and 4-1.4 in Part 4, 1 “Outdoor Unit Electric Control Box Layout”.

2. Refer to Figures 4-1.2 and 4-1.4 in Part 4, 1 “Outdoor Unit Electric Control Box Layout”.

3. Inverter module temperature sensor connection are ports CN41 and CN42 on the main PCB (labeled 26 in Figure 4-2.1 in Part 4, 2.2 “Outdoor unit main

PCB”).

4. Measure sensor resistance. If the resistance is too low, the sensor has short-circuited. If the resistance is not consistent with the sensor’s resistance

characteristics table, the sensor has failed. Refer to Table 4-5.3 “Temperature Sensor Resistance Characteristics”.

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4.19 PU/FF Troubleshooting

Digital display output 4.19.1

Description 4.19.2

 1PU indicates fan module A protection.  2PU indicates fan module B protection.  FF indicates PU protection has displayed 2times. When a FF occurred 3 times in 20 minutes, a manual system restart

is required before the system can resume operation.

 All units stop running. The cause of an HH error should be addressed promptly in order to avoid system damage.  Error code is only displayed on the main PCB and user interface.

Possible causes 4.19.3

 Switch SW1 incorrectly set.  Power or communication wires not connected properly.  Fan motor blocked or has failed.  Power supply abnormal.  AC filter board damaged.  Fan module damaged.  Inverter module PCB damaged.

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PU/FF

No

Some power wires or communication

wires of fan module are not connected

properly1

Yes

Ensure power and communication wires

are connected properly

No

The fan motor is blocked or has failed2

Yes

Remove obstruction or replace the fan

motor

No

The power supply is abnormal

Yes

Check the power supply equipment

No

Voltage between P and N on fan module

is abnormal3

Yes

Replace AC filter board

No

Replacing the fan module resolves the

error

No

Replace main PCB

Procedure 4.19.4

Notes:

1. Refer to Figures 4-1.2 and 4-14 in Part 4, 1 “Outdoor Unit Electric Control Box Layout”.

2. Refer to Part 2, 1 “Layout of Functional Components”.

3. The normal voltage between P and N on the fan module is 310V DC. Refer to Figures 4-1.2 and 4-1.4 in Part 4, 1 “Outdoor Unit Electric Control Box Layout”

and to Figure 4-2.3 in Part 4, 2 “Fan module PCB”

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H0

Power supply for main PCB 1

Yes

Provide normal power supply

No

There is a source of electromagnetic

radiation near the unit, such as

high-frequency transmitter or other high

strength radiation device

Yes

Remove the source of interference

No

Replace main PCB and inverter driven

module in turn

4.20 H0 Troubleshooting

Digital display output 4.20.1

Description 4.20.2

 1H0 indicates a Communication error between main control chip and compressor A inverter driver chip.  2H0 indicates a Communication error between main control chip and compressor B inverter driver chip.  All units stop running.  Error code H0 is displayed on main PCB and user interface.

Possible causes 4.20.3

 Power supply abnormal.  Interference from a source of electromagnetic radiation.  Main PCB or inverter driven module damaged.

Procedure 4.20.4

Notes:

1. Measure the voltages of power input port and on the main PCB. The normal voltage of power input port terminals is 220V. Refer to CN43 on the main PCB

(labeled 9 in Figure 4-2.1 in Part 4, 2.2 “Outdoor unit main PCB”).

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4.21 H1 Troubleshooting

Digital display output 4.21.1

Description 4.21.2

 Abnormal power supply voltage.  All units stop running.  Error code is only displayed on main PCB and user interface.

Possible causes 4.21.3

 Outdoor unit power supply voltage at or above260V or drops below 165V or a phase is missing.  Loosened wiring within electric control box.  High voltage circuit error.  Main PCB damaged.

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H1

ODU power supply voltage at or

above260V or drops below 165V or or a

phase is missing1

Yes

Provide normal power supply

No

Wires between outdoor main PCB, AC

filter boards and electric control box

power supply terminals are loose2

Yes

Ensure the wires are connected properly

No

High voltage circuit error has occurred,

such as the compressor has

malfunctioned3, the fan motor has

short-circuited4, or the inverter module

has short-circuited5

Yes

Replace or repair the relevant parts

No

Replace outdoor main PCB

Procedure 4.21.4

Notes:

1. The normal voltage between A and N, B and N, and C and N is 198-242V.

2. Refer to Figures 4-1.2 to 4-1.4 in Part 4, 1 “Outdoor Unit Electric Control Box Layout”.

3. The normal resistances of the inverter compressor are 0.7-1.5Ω among U V W and infinite between each of U V W and ground. If any of the resistances

differ from these specifications, the compressor has malfunctioned. Refer to Figures 4-4.4 and 4-4.5 in Part 4, 4.12.6 “xL0 troubleshooting”.

4. The normal resistances of the fan motor coil among U V W are less than 10Ω. If a measured resistance is 0Ω, the fan motor has short-circuited. Refer to

Part 2, 1 “Layout of Functional Components”.

5. Set a multi-meter to buzzer mode and test any two terminals of P N and U V W of the inverter module. If the buzzer sounds, the inverter module has

short-circuited. Refer to Figures 4-1.2and 4-1.4 in Part4, 1 “Outdoor Unit Electric Control Box Layout” and to Figure 4-4.6.

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4.22 H6 Troubleshooting

Digital display output 4.22.1

Description 4.22.2

 DC bus voltage protection.  Only occurred in standby status.  Error code is displayed on main PCB and user interface.

Possible causes 4.22.3

 Abnormal power supply voltage  Loosened wiring within electric control box.  High voltage circuit error.  AC filter board damaged.  3-pahse bridge rectifier damaged.  Compressor Inverter module damaged.

Procedure 4.22.4

Refer to P6 protection: xL1 and Xl2.

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H6

The S5_3 of slave units is different with

the master unit1

Yes

Adjust the switch of S5_3

No

Replace outdoor main PCB

4.23 FP Troubleshooting

Digital display output 4.23.1

Description 4.23.2

 FP indicates pump in a combination system dial to different status. When the FP displayed, a manual system restart is

required before the system can resume operation.

 All units stop running.  Error code is only displayed on main PCB and user interface.

Possible causes 4.23.3

 The S5_3 of slave units is different with the master unit.  Main PCB damaged.

Procedure 4.23.4

Note:

1. Dial switch S5 on the main PCB (labeled 3 in Figure 4-2.1 in Part 4, 2.2 “Outdoor unit main PCB”)

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Table 5-5.1: Outdoor ambient temperature sensor and outdoor heat exchanger temperature sensor resistance characteristics

Temperature

(°C )

Resistance

(kΩ)

Temperature

(°C )

Resistance

(kΩ)

Temperature

(°C )

Resistance

(kΩ)

Temperature

(°C )

Resistance

(kΩ)

-20

115.3

20

12.64

60

2.358

100

0.6297

-19

108.1

21

12.06

61

2.272

101

0.6115

-18

101.5

22

11.50

62

2.191

102

0.5939

-17

96.34

23

10.97

63

2.112

103

0.5768

-16

89.59

24

10.47

64

2.037

104

0.5604

-15

84.22

25

10.00

65

1.965

105

0.5445

-14

79.31

26

9.551

66

1.896

106

0.5291

-13

74.54

27

9.124

67

1.830

107

0.5143

-12

70.17

28

8.720

68

1.766

108

0.4999

-11

66.09

29

8.336

69

1.705

109

0.4860

-10

62.28

30

7.971

70

1.647

110

0.4726

-9

58.71

31

7.624

71

1.591

111

0.4596

-8

56.37

32

7.295

72

1.537

112

0.4470

-7

52.24

33

6.981

73

1.485

113

0.4348

-6

49.32

34

6.684

74

1.435

114

0.4230

-5

46.57

35

6.400

75

1.387

115

0.4116

-4

44.00

36

6.131

76

1.341

116

0.4006

-3

41.59

37

5.874

77

1.291

117

0.3899

-2

39.82

38

5.630

78

1.254

118

0.3796

-1

37.20

39

5.397

79

1.2133

119

0.3695

0

35.20

40

5.175

80

1.174

120

0.3598

1

33.33

41

4.964

81

1.136

121

0.3504

2

31.56

42

4.763

82

1.100

122

0.3413

3

29.91

43

4.571

83

1.064

123

0.3325

4

28.35

44

4.387

84

1.031

124

0.3239

5

26.88

45

4.213

85

0.9982

125

0.3156

6

25.50

46

4.046

86

0.9668

126

0.3075

7

24.19

47

3.887

87

0.9366

127

0.2997

8

22.57

48

3.735

88

0.9075

128

0.2922

9

21.81

49

3.590

89

0.8795

129

0.2848

10

20.72

50

3.451

90

0.8525

130

0.2777

11

19.69

51

3.318

91

0.8264

131

0.2708

12

18.72

52

3.192

92

0.8013

132

0.2641

13

17.80

53

3.071

93

0.7771

133

0.2576

14

16.93

54

2.959

94

0.7537

134

0.2513

15

16.12

55

2.844

95

0.7312

135

0.2451

16

15.34

56

2.738

96

0.7094

136

0.2392

17

14.62

57

2.637

97

0.6884

137

0.2334

18

13.92

58

2.540

98

0.6682

138

0.2278

19

13.26

59

2.447

99

0.6486

139

0.2223

5 Appendix to Part 5

5.1 Temperature Sensor Resistance Characteristics

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Table 5-5.2: Compressor top temperature sensor and discharge pipe temperature sensor resistance characteristics

Temperature

(°C )

Resistance

(kΩ)

Temperature

(°C )

Resistance

(kΩ)

Temperature

(°C )

Resistance

(kΩ)

Temperature

(°C )

Resistance

(kΩ)

-20

542.7

20

68.66

60

13.59

100

3.702

-19

511.9

21

65.62

61

13.11

101

3.595

-18

483.0

22

62.73

62

12.65

102

3.492

-17

455.9

23

59.98

63

12.21

103

3.392

-16

430.5

24

57.37

64

11.79

104

3.296

-15

406.7

25

54.89

65

11.38

105

3.203

-14

384.3

26

52.53

66

10.99

106

3.113

-13

363.3

27

50.28

67

10.61

107

3.025

-12

343.6

28

48.14

68

10.25

108

2.941

-11

325.1

29

46.11

69

9.902

109

2.860

-10

307.7

30

44.17

70

9.569

110

2.781

-9

291.3

31

42.33

71

9.248

111

2.704

-8

275.9

32

40.57

72

8.940

112

2.630

-7

261.4

33

38.89

73

8.643

113

2.559

-6

247.8

34

37.30

74

8.358

114

2.489

-5

234.9

35

35.78

75

8.084

115

2.422

-4

222.8

36

34.32

76

7.820

116

2.357

-3

211.4

37

32.94

77

7.566

117

2.294

-2

200.7

38

31.62

78

7.321

118

2.233

-1

190.5

39

30.36

79

7.086

119

2.174

0

180.9

40

29.15

80

6.859

120

2.117

1

171.9

41

28.00

81

6.641

121

2.061

2

163.3

42

26.90

82

6.430

122

2.007

3

155.2

43

25.86

83

6.228

123

1.955

4

147.6

44

24.85

84

6.033

124

1.905

5

140.4

45

23.89

85

5.844

125

1.856

6

133.5

46

22.89

86

5.663

126

1.808

7

127.1

47

22.10

87

5.488

127

1.762

8

121.0

48

21.26

88

5.320

128

1.717

9

115.2

49

20.46

89

5.157

129

1.674

10

109.8

50

19.69

90

5.000

130

1.632

11

104.6

51

18.96

91

4.849

12

99.69

52

18.26

92

4.703

13

95.05

53

17.58

93

4.562

14

90.66

54

16.94

94

4.426

15

86.49

55

16.32

95

4.294

16

82.54

56

15.73

96

4.167

17

78.79

57

15.16

97

4.045

18

75.24

58

14.62

98

3.927

19

71.86

59

14.09

99

3.812

96 201709

Aqua Tempo Super II

Part

4 - Diagnosis and Troubleshooting

Table 5-5.3: Inverter module temperature sensor resistance characteristics

Temperature

(°C )

Resistance

(kΩ)

Temperature

(°C )

Resistance

(kΩ)

Temperature

(°C )

Resistance

(kΩ)

Temperature

(°C )

Resistance

(kΩ)

-30

971.4

10

109.0

50

19.70

90

5.000

-29

912.8

11

103.9

51

18.97

91

4.855

-28

858.2

12

99.02

52

18.26

92

4.705

-27

807.3

13

94.44

53

17.59

93

4.566

-26

759.7

14

90.11

54

16.94

94

4.431

-25

715.3

15

86.00

55

16.32

95

4.301

-24

673.6

16

82.09

56

15.73

96

4.176

-23

634.7

17

78.38

57

15.16

97

4.055

-22

598.2

18

74.87

58

14.62

98

3.938

-21

564.1

19

71.53

59

14.10

99

3.825

-20

532.2

20

68.36

60

13.60

100

3.716

-19

502.2

21

65.34

61

13.12

101

3.613

-18

474.1

22

62.47

62

12.65

102

3.514

-17

447.7

23

59.75

63

12.22

103

3.418

-16

423.0

24

57.17

64

11.79

104

3.326

-15

399.8

25

54.71

65

11.39

105

3.235

-14

378.0

26

52.36

66

10.99

106

3.148

-13

357.5

27

50.13

67

10.62

107

3.063

-12

338.2

28

48.01

68

10.25

108

2.982

-11

320.1

29

45.99

69

9.909

109

2.902

-10

303.1

30

44.07

70

9.576

110

2.826

-9

287.1

31

42.23

71

9.253

111

2.747

-8

272.0

32

40.48

72

8.947

112

2.672

-7

257.8

33

38.81

73

8.646

113

2.599

-6

244.4

34

37.23

74

8.362

114

2.528

-5

231.9

35

35.71

75

8.089

115

2.460

-4

220.0

36

34.27

76

7.821

116

2.390

-3

208.7

37

32.89

77

7.569

117

2.322

-2

198.2

38

31.58

78

7.323

118

2.256

-1

188.2

39

30.33

79

7.088

119

2.193

0

178.8

40

29.13

80

6.858

120

2.132

1

169.9

41

27.98

81

6.640

121

2.073

2

161.5

42

26.89

82

6.432

122

2.017

3

153.6

43

25.85

83

6.230

123

1.962

4

146.1

44

24.85

84

6.033

124

1.910

5

139.1

45

23.90

85

5.847

125

1.859

6

132.3

46

22.98

86

5.667 7 126.0

47

22.10

87

5.492 8 120.0

48

21.26

88

5.322 9 114.3

49

20.47

89

5.159

201709 97

Aqua Tempo Super II

Midea Aqua Tempo Super II

Service Manual

Table 5-5.4: Outdoor unit in normal cooling mode operating parameters

Outdoor ambient temperature

°C

< 10

10 to 25

25 to 35

35 to 48

> 48

Average discharge temperature

°C

50-80

55-85

60-90

65-98

70-100

Average discharge superheat

°C

17-30

17-33

17-34

17-36

10-32

Discharge pressure

MPa

1.7-2.8

1.8-2.8

2.0-3.6

2.5-3.8

3.1-4.2

Average suction superheat

°C

3-7

4-9

5-11

6-12

8-12

Suction pressure

MPa

0.6-0.9

0.7-1.0

0.8-1.2

1.0-1.3

1.2-1.4

Average suction temperature

°C

5-15

5-18

5-20

6-20

8-15

T3

°C

0-12

12-30

28-46

40-52

50-56

Tz/7

°C

22-25

12-28

28-45

40-52

50-55

Taf

°C

5-25

Twi

°C

0-30

Two

°C

5-25

Tw

°C

5-25

DC fan motor current

A

0.2-6

2-6

3-6

4-6

5-6

DC inverter compressor current

A

6-12

2-16

3-17

4-18

5-16

Note:

1. All the sensors please refer to Figure 2-2.1 and 2-2.2 in Part 2, 2 “Piping Diagrams”.

Table 5-5.5: Outdoor unit in low water outlet cooling mode operating parameters

Outdoor ambient temperature

°C

< 10

10 to 25

25 to 35

35 to 48

> 48

Average discharge temperature

°C

50-80

55-85

60-90

65-98

70-100

Average discharge superheat

°C

17-30

17-33

17-34

17-36

10-32

Discharge pressure

MPa

1.7-2.8

1.8-2.8

2.0-3.6

2.5-3.8

3.1-4.2

Average suction superheat

°C

3-7

4-9

5-11

6-12

8-12

Suction pressure

MPa

0.6-0.9

0.7-1.0

0.8-1.2

1.0-1.3

1.2-1.4

Average suction temperature

°C

2-15

3-18

4-20

5-20

6-16

T3

°C

0-12

12-30

28-46

40-52

50-56

Tz/7

°C

22-25

12-28

28-45

40-52

50-55

Taf

°C

5-25

Twi

°C

0-30

Two

°C

5-25

Tw

°C

5-25

DC fan motor current

A

0.3-6

2-6

3-6

4-6

5-6

DC inverter compressor current

A

4-12

2-16

3-17

4-18

5-16

Note:

1. All the sensors please refer to Figure 2-2.1 and 2-2.2 in Part 2, 2 “Piping Diagrams”.

5.2 Normal Operating Parameters of Refrigerant System

Under the following conditions, the operating parameters given in Tables 5-5.4 and 5-5.5 should be observed:

 If the outdoor ambient temperature is high, the system is being run in normal cooling mode with the following

settings: temperature 5°C .

 If the outdoor ambient temperature is high, the system is being run in low water outlet cooling mode with the

following settings: temperature 0°C .

 If the outdoor ambient temperature is low, the system is being run in heating mode with the following settings:

temperature 55°C .

 The system has been running normally for more than 30 minutes.

98 201709

Aqua Tempo Super II

Part

4 - Diagnosis and Troubleshooting

Table 5-5.4: Outdoor unit in heating mode operating parameters

Outdoor ambient temperature

°C

< -10

-10 to 0

0 to 7

7 to 20

> 20

Average discharge temperature

°C

40-95

42-96

44-97

45-97

50-98

Average discharge superheat

°C

17-35

17-33

14-33

Discharge pressure

MPa

1.7-2.6

1.8-2.8

1.9-3.3

2.2-3.5

2.3-3.8

Average suction superheat

°C

-2-0

-2-2

-1-4

0-6

1-8

Suction pressure

MPa

0.2-0.5

0.3-0.7

0.4-0.9

0.6-1.2

0.8-1.4

Average suction temperature

°C

-22 to -11

-16 to 2

-10 to 5

0 to 15

5 to 18

T3

°C

-20 to -11

-16 to 0

-10 to 2

1 to 12

5 to 15

Tz/7

°C

-19 to -4

-14 to 1

-5 to -2

1 to 6

2 to 10

Taf

°C

15-45

15-50

15-55

Twi

°C

15-40

15-45

15-50

Two

°C

18-45

18-50

18-55

Tw

°C

18-45

18-50

18-55

DC fan motor current

A

5-6

4-6

2-6

0.5-6

0.3-6

DC inverter compressor current

A

1-15

1-16

1-17

2-18

Note:

1. All the sensors please refer to Figure 2-2.1 and 2-2.2 in Part 2, 2 “Piping Diagrams”.

201709 99

Midea Aqua Tempo Super II, MC-SU60-RN1L, MC-SU30-RN1L Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

CONTENTS