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Rev 2.0

DVM S Advance Service & Troubleshooting Due to Samsung’s policy of ongoing product development, specifications are subject to change without prior notice. Every effort has been made to insure that the information included in this presentation is as accurate as possible at the time of it’s publication. This presentation is provided as a guide to help HVAC field technicians understand the most common service and diagnostic procedures for the Samsung DVMS VRF systems. This training module is not intended to replace Samsung service manuals, technical data books, installation/operation manuals or other factory documents. Only properly trained, HVAC professionals should attempt to install and service any Samsung heating and airconditioning system. High Voltage Caution: Extra care must be taken when working on or around DVM S equipment due to numerous high voltage components. Whether installing or servicing DVM S equipment in the field or while attending Samsung HVAC training classes which include powered simulators and equipment, be aware of the potential dangers of high voltage – use caution This presentation may only be used with authorization by Samsung HVAC. Unauthorized use, duplication or alteration of this presentation is prohibited. For technical support issues, always contact your Samsung equipment provider. www.samsunghvac.com

www.schoox.com/login.php

www.dvmdownload.com

2

Advance Service & Troubleshooting TOPICS  Basic System Operation  Heat Pump Introduction  Heat Recovery Introduction  Indoor Unit (IDU) Control  Outdoor Unit (ODU) Control  Heat Pump Refrigerant Circuit  Heat Recovery Refrigerant Circuit 3

DVM S Basic System Operation

Basic System Operation Indoor Unit Control – On/Off ODU Status IDU Status

RC Status

Turn on

Refrigerant flowing F3/F4 comm.

Thermo on ON

ON

ON

Turn on

Refrigerant stop F3/F4 comm.

OFF

ON

Thermo off ON

Refrigerant stop

Turn off

F3/F4 comm.

OFF

OFF

OFF

5

Basic System Operation Outdoor Unit Control – On/Off

OFF

OFF

OFF

OFF

OFF

OFF

OFF

ON

 Any indoor unit in a “thermo on” condition will start the outdoor unit

OFF

OFF

OFF

 Example: IDU is ON but the EEV is closed (Thermo Off) – ODU is OFF

OFF

ON *Thermo on

OFF

OFF

ON

*Thermo on

ON *Thermo off

ON *Thermo off

OFF

ON

6

Basic System Operation Outdoor Unit Capacity Control 18,000 Btu/h

18,000 Btu/h

18,000 Btu/h

OFF

OFF

OFF

18,000 Btu/h

ON

Outdoor unit target capacity

ON

18,000 Btu/h

ON

54,000 Btu/h

ON

18,000 Btu/h

*Thermo on 18,000 Btu/h

ON

18,000 Btu/h

18,000 Btu/h

ON

OFF

*Thermo on

*Thermo on

18,000 Btu/h

18,000 Btu/h

ON *Thermo off

ON

*Thermo on

18,000 Btu/h

ON

*Thermo on 18,000 Btu/h

18,000 Btu/h

OFF

ON *Thermo off

7

Basic System Operation Operating Temperature Range For Outdoor Unit Start 

When ambient temperature is out of range, the system will not start and generates error  E440 – Prevention of heat operation  E441 – Prevention of cool operation

 

System checks ambient temperature condition only on outdoor unit (compressor) start up The DVM S outdoor units will operate when ambient temperatures are exceeded however capacity and efficiency will decrease accordingly -13°F 23°F Cooling start prohibited Outdoor temperature

Cooling operation area -5~48℃(23~120℉) Heating operation area

Heating start prohibited

-20~24℃(-4~75 ℉) 75°F

86°F

8

DVM S VRF Heat Pump Introduction

Heat Pump Introduction Heat Pump Outdoor Unit OD Fan

Control Box Control Box

OD Fans

OD Heat Exchanger

OD Heat Exchanger

4-WAY V/V

4-WAY V/V

Accumulator

Accumulator

Subcooler

Subcooler

Compressor Gas V/V

Liquid V/V

Oil Separator

Oil Separator Gas V/V

Liquid V/V

Compressor

10

Heat Pump Introduction

Name

Heat Pump Refrigerant Circuit – Single Fan 1 compressor unit

SV_G

OFM

T_A T_CO

OHX

T_S

CV_E

HPS

E

V_4W

V_EB s T_EO

CV_D

E_M

T_EI E

IC

E_EV

OS HPSW

T_D s

T_CT

INV

V_HG

LPS

CH

AC

IPMC T_L

V_ES

s V_AR

SV_L

INV OFM OHX AC OS IC IPMC CH HPS LPS HPSW E_M E_EV V_ES V_EB V_HG V_4W V_AR CV_E CV_D T_D T_S T_CO T_EI T_EO T_L T_CT T_A SV_G SV_L

Inverter Compressor Outdoor Fan Motor Outdoor Heat Exchanger Accumulator Oil Separator Intercooler IPM Cooler Crank Case Heater High Pressure Sensor Low Pressure Sensor High Pressure Switch Main EEV EVI EEV EVI Sol. Valve EVI Bypass Valve Hot Gas Bypass Valve 4Way Valve Accumulator Oil Return Valve EEV Bypass Check Valve Discharge Check Valve Discharge Temp. Sensor Suction Temp. Sensor Cond Out Temp. Sensor EVI In Temp. Sensor EVI Out Temp. Sensor Liquid Tube Temp. Sensor Comp. Top Temp. Sensor Ambient Temp. Sensor Gas Pipe Service Valve Liquid Pipe Service Valve

12

Heat Pump Introduction Heat Pump Refrigerant Circuit – Dual Fan 1 compressor unit

OFM

SV_G

OFM

T_A T_C O

OHX

T_S

CV_E

HPS

V_EB s

CV_D

E

V_4W

T_EO

E_M

T_EI E

IC

E_EV

OS HPSW

T_D

V_HG s

T_CT

INV

LPS

CH

AC

IPMC

T_L V_ES

sV_AR

SV_L

INV OFM OHX AC OS IC IPMC CH HPS LPS HPSW E_M E_EV V_ES V_EB V_HG V_4W V_AR CV_E CV_D T_D T_S T_CO T_EI T_EO T_L T_CT T_A SV_G SV_L

Name Inverter Compressor Outdoor Fan Motor Outdoor Heat Exchanger Accumulator Oil Separator Intercooler IPM Cooler Crank Case Heater High Pressure Sensor Low Pressure Sensor High Pressure Switch Main EEV EVI EEV EVI Sol. Valve EVI Bypass Valve Hot Gas Bypass Valve 4Way Valve Accumulator Oil Return Valve EEV Bypass Check Valve Discharge Check Valve Discharge Temp. Sensor Suction Temp. Sensor Cond Out Temp. Sensor EVI In Temp. Sensor EVI Out Temp. Sensor Liquid Tube Temp. Sensor Comp. Top Temp. Sensor Ambient Temp. Sensor Gas Pipe Service Valve Liquid Pipe Service Valve

13

Heat Pump Introduction Heat Pump Refrigerant Circuit – Dual Fan 2 compressor unit SV_G OFM

T_A T_CO

OHX

OS

IC

OS

T_EI

V_EB s T_EO

HPSW

E_EV

T_D V_HG

INV

s

T_D T_CT INV

CH

CV_D

E

T_CT

IPMC

IPMC

CV_D

E_M

T_S

HPS

HPSW

E

CV_E V_4W

LPS

CH

T_L s

V_ES

AC

V_ES

V_AR

SV_L

INV OFM OHX AC OS IC IPMC CH HPS LPS HPSW E_M E_EV V_ES V_EB V_HG V_4W V_AR CV_E CV_D T_D T_S T_CO T_EI T_EO T_L T_CT T_A SV_G SV_L

Name Inverter Compressor Outdoor Fan Motor Outdoor Heat Exchanger Accumulator Oil Separator Intercooler IPM Cooler Crank Case Heater High Pressure Sensor Low Pressure Sensor High Pressure Switch Main EEV EVI EEV EVI Sol. Valve EVI Bypass Valve Hot Gas Bypass Valve 4Way Valve Accumulator Oil Return Valve EEV Bypass Check Valve Discharge Check Valve Discharge Temp. Sensor Suction Temp. Sensor Cond Out Temp. Sensor EVI In Temp. Sensor EVI Out Temp. Sensor Liquid Tube Temp. Sensor Comp. Top Temp. Sensor Ambient Temp. Sensor Gas Pipe Service Valve Liquid Pipe Service Valve

14

Heat Pump Introduction Part Introduction – Major Components

E IPM2 IPM1

3 4 2 2

2

2

1

1

1

4

s

1

3 E

s

s

Name

Description

Compressors

1

Oil separator

2

Intercooler

3

Accumulator

4

■ 2 types of inverter compressors ■ Vapor injection compressor & Flash injection compressor When compressor operates, oil is discharged from the compressors. To maintain proper compressor oil level. 1. To secure sub-cooling, 2. Vapor injection To protect the compressor from liquid flood back operation, the accumulator collects liquid refrigerant and allows only the gas to enter the compressor.

15

Heat Pump Introduction Part Introduction – Valve & EEV 5

3

2

1

3

IPM2

IPM1

4

7

E

2

6

7

Name

Type

4

s

1

E

5 s

s 6

Function

Hot gas bypass valve

1

Solenoid

To compensate severe low pressure drop.

4way valve

2

Solenoid

To change operation mode of cooling and heating operation.

Main EEV

3

Stepper Motor

To control refrigerant flow rate in heating operation.

EVI EEV

4

Stepper Motor

To control refrigerant flow rate for sub-cooling.

5 EVI bypass valve Accumulator Oil Return Valve 6 7 EVI Sol valve

Solenoid Solenoid

To supply vapor refrigerant to compressor suction. To recover oil from accumulator.

Solenoid

To inject vapor into the compressor scroll.

16

Heat Pump Introduction Part Introduction – Sensor & Switch 4

5 6

10

11 2

4

3

1

2

6 3 2

1

s

2

8

9

1 s

5

3

E

1

IPM2 IPM1

7

E

10 9 83

7 s

Name

Type

Name

Type

Discharge temp. sensor

1

200K ohm

Tube temp. sensor

7

10K ohm

Top temp. sensor

2

200K ohm

EVI in sensor

8

10K ohm

High pressure switch

3

-

EVI out sensor

9

10K ohm

High pressure sensor

4

-

Suction temp. sensor

10

10K ohm

Ambient air temp. sensor

5

10K ohm

Low pressure sensor

11

-

Cond. out temp. sensor

6

10K ohm

17

Heat Pump Introduction Part Introduction – Sensor & Switch Name

Type

Discharge temp. sensor

200K ohm

To sense compressor discharge gas temperature

Ambient temp. sensor

10K ohm

To sense outside ambient temperature

Cond_out temp. sensor

10K ohm

To sense condensing outlet temperature.

EVI in/out temp. sensor

10K ohm

To sense the temperature of vapor injection refrigerant

Liquid tube temp. sensor

10K ohm

To sense the sub-cooled refrigerant temperature.

Suction temp. sensor

10K ohm

To Sense compressor suction gas temperature

Name

Description

Description

Output

High pressure sensor

To sense high pressure. To control fan RPM in cooling operation. To control compressor capacity in heating operation.

DC voltage 0 ~4.5V

Low pressure sensor

To sense low pressure temperature To control compressor capacity in cooling operation To control fan RPM in heating operation

DC voltage 0 ~4.5V

18

DVM S VRF Heat Recovery Introduction

Heat Recovery Introduction Heat Recovery Refrigerant Circuit – 1 Fan 1 compressor unit CV_MC s

CV_H

SV_HG

OFM

T_A

V_MC

T_CO

OHX

s

s

V_OE

V_HG2

E

CV_E

T_S1

V_4W

E_M

HPS V_EB s

CV_D

SV_LG

T_EO

OS HPSW

E_EV

T_S2 IPMC

T_D

T_CT

T_EI E

IC

V_HG1 s

INV

LPS

AC T_L

CH V_ES

s V_AR

SV_L

INV OFM OHX AC / OS IC / IPMC CH HPS LPS HPSW E_M / E_EV V_MC V_ES V_EB V_HG1 V_HG2 V_4W V_AR V_OE CV_E CV_D CV_H CV_MC T_D T_S1 T_S2 T_CO T_EI T_EO T_L T_CT T_A SV_HG SV_LG SV_L

Name Inverter Compressor Outdoor Fan Motor Outdoor Heat Exchanger Accumulator / Oil Separator Intercooler / IPM Cooler Crank Case Heater High Pressure Sensor Low Pressure Sensor High Pressure Switch Main EEV / EVI EEV Main Cooling Valve EVI Sol. Valve EVI Bypass Valve Hot Gas Bypass Valve 1 Hot Gas Bypass Valve 2 4Way Valve Accumulator Oil Return Valve Outdoor EEV Valve EEV Bypass Check Valve Discharge Check Valve HR Check valve Main Cooling Check Valve Discharge Temp. Sensor Suction Temp. Sensor 1 Suction Temp. Sensor 2 Cond Out Temp. Sensor EVI In Temp. Sensor EVI Out Temp. Sensor Liquid Tube Temp. Sensor Comp. Top Temp. Sensor Ambient Temp. Sensor High Gas Pipe Service Valve Low Gas Pipe Service Valve Liquid Pipe Service Valve

20

Heat Recovery Introduction Heat Recovery Refrigerant Circuit – 2 Fan 1 compressor unit

CV_MC s

CV_H

SV_HG

OFM

OFM

T_A

V_MC

T_CO

OHX

s

s

V_OE

V_HG2

E

CV_E

T_S

V_4W

E_M

HPS V_EB s

CV_D

SV_LG

T_EO

OS HPSW

E_EV

T_S2

T_D

T_CT

IPMC

V_HG1 s

INV

T_EI E

IC

LPS

AC T_L

CH

V_ES

s V_AR

SV_L

INV OFM OHX AC / OS IC / IPMC CH HPS LPS HPSW E_M / E_EV V_MC V_ES V_EB V_HG1 V_HG2 V_4W V_AR V_OE CV_E CV_D CV_H CV_MC T_D T_S1 T_S2 T_CO T_EI T_EO T_L T_CT T_A SV_HG SV_LG SV_L

Name Inverter Compressor Outdoor Fan Motor Outdoor Heat Exchanger Accumulator / Oil Separator Intercooler / IPM Cooler Crank Case Heater High Pressure Sensor Low Pressure Sensor High Pressure Switch Main EEV / EVI EEV Main Cooling Valve EVI Sol. Valve EVI Bypass Valve Hot Gas Bypass Valve 1 Hot Gas Bypass Valve 2 4Way Valve Accumulator Oil Return Valve Outdoor EEV Valve EEV Bypass Check Valve Discharge Check Valve HR Check valve Main Cooling Check Valve Discharge Temp. Sensor Suction Temp. Sensor 1 Suction Temp. Sensor 2 Cond Out Temp. Sensor EVI In Temp. Sensor EVI Out Temp. Sensor Liquid Tube Temp. Sensor Comp. Top Temp. Sensor Ambient Temp. Sensor High Gas Pipe Service Valve Low Gas Pipe Service Valve Liquid Pipe Service Valve

21

Heat Recovery Introduction Heat Recovery Refrigerant Circuit – Dual Fan 2 compressor unit SV_HG CV_MC

OFM

s

V_MC

CV_H

T_A T_CO

OHX

s E_M

CV_E V_4W

s

E

V_OE

V_HG2

T_S

INV OFM OHX AC / OS IC / IPMC CH HPS LPS HPSW E_M / E_EV V_MC V_ES V_EB V_HG1 V_HG2 V_4W V_AR

HPS CV_D OS

T_CT

OS

T_S2

HPSW T_D T_D T_CT

s

LPS

CH

T_EO

T_EI

IC

SV_LG

AC T_L

s V_ES

V_EB s

E_EV

V_HG

INV

INV CH

CV_D

E

HPSW

IPMC

IPMC

V_ES

V_AR

SV_L

V_OE CV_E CV_D CV_H CV_MC T_D T_S1 T_S2 T_CO T_EI T_EO T_L T_CT T_A SV_HG SV_LG SV_L

Name Inverter Compressor Outdoor Fan Motor Outdoor Heat Exchanger Accumulator / Oil Separator Intercooler / IPM Cooler Crank Case Heater High Pressure Sensor Low Pressure Sensor High Pressure Switch Main EEV / EVI EEV Main Cooling Valve EVI Sol. Valve EVI Bypass Valve Hot Gas Bypass Valve 1 Hot Gas Bypass Valve 2 4Way Valve Accumulator Oil Return Valve Outdoor EEV Valve EEV Bypass Check Valve Discharge Check Valve HR Check valve Main Cooling Check Valve Discharge Temp. Sensor Suction Temp. Sensor 1 Suction Temp. Sensor 2 Cond Out Temp. Sensor EVI In Temp. Sensor EVI Out Temp. Sensor Liquid Tube Temp. Sensor Comp. Top Temp. Sensor Ambient Temp. Sensor High Gas Pipe Service Valve Low Gas Pipe Service Valve Liquid Pipe Service Valve

22

Heat Recovery Introduction Part Introduction – Major Components s s s

E

4 3 2 2

2

3 E

s s

1

2

1

1

4

1 s

Name

Description

Compressors

1

Oil separator

2

Intercooler

3

Accumulator

4

■ 2 types of inverter compressors ■ Vapor injection compressor & Flash injection compressor When compressor operates, oil is discharged from the compressors. To maintain proper compressor oil level. 1. To secure sub-cooling, 2. Vapor injection To protect the compressor from liquid flood back operation, the accumulator collects liquid refrigerant and allows only the gas to enter the compressor.

23

Heat Recovery Introduction Part Introduction – Valve & EEV s

5

s

4

5

8

E

6

s

3

4

2

3

1

2 7

E

6 s 1 s

8

Name Hot gas bypass valve 1 Hot gas bypass valve 2 4way valve Main cooling valve Outdoor EEV valve EVI bypass valve Accumulator Oil Return Valve EVI Sol valve

1 2 3 4 5 6 7 8

Type Solenoid Solenoid Solenoid Solenoid Stepper Motor Solenoid Solenoid Solenoid

s 7

Function To compensate severe low pressure drop. To equalize high & low pressure on unit stop To change Heat/Cool operation mode – Energizes for heat operation. To supply refrigerant to heating indoor unit in main cooling operation. To control refrigerant flow rate in main cooling operation. To supply vapor refrigerant to compressor suction. To recover oil from accumulator. To inject vapor to scroll.

24

Heat Recovery Introduction Part Introduction – Valve & EEV

s s

s

E

1

2 1 E

s

2

s s

Name Outdoor main EEV EVI EEV

Type

Function

1 Stepper Motor To control refrigerant flow rate in heating operation. 2 Stepper Motor To control refrigerant flow rate for sub-cooling.

25

Heat Recovery Introduction Part Introduction – Sensor & Switch 5 s

6

4

s

10

s

E

11 9 8 3 7 2

10 4

12

3 2

11

6 1

3

5

1

8

9

s

2

s

E

1

12

7

s

Name

Type

Name

Type

Discharge temp. sensor

1

200K ohm

Tube temp. sensor

7

10K ohm

Top temp. sensor

2

200K ohm

EVI in sensor

8

10K ohm

High pressure switch

3

-

EVI out sensor

9

10K ohm

High pressure sensor

4

-

Suction temp. sensor 1

10

10K ohm

Ambient air temp. sensor

5

10K ohm

Suction temp. sensor 2

11

10K ohm

Cond. out temp. sensor

6

10K ohm

Low pressure sensor

12

-

26

Heat Recovery Introduction Part Introduction – Sensor & Switch Name

Type

Discharge temp. sensor

200K ohm

To sense compressor discharged gas temperature

Ambient temp. sensor

10K ohm

To sense outdoor ambient temperature

Cond_out temp. sensor

10K ohm

To sense condenser outlet temperature.

EVI in/out temp. sensor

10K ohm

To sense vapor injection refrigerant temperature

Liquid tube temp. sensor

10K ohm

To sense sub-cooled refrigerant temperature

Suction temp. sensor

10K ohm

To sense compressor suction gas temperature

Name

Description

Description

Output

High pressure sensor

To sense high pressure. To control fan RPM in cooling operation. To control compressor capacity in heating operation.

DC voltage 0 ~4.5V

Low pressure sensor

To sense low pressure To control compressor capacity in cooling operation To control fan RPM in heating operation

DC voltage 0 ~4.5V

27

Heat Recovery Introduction Mode Change Units – S*NEK Heat Recovery – MCU Mode Change Unit  1,2,4&6 port models (max. 8 indoor units per port)  Brazed pipe connections  Main 3-pipe connection on both sides of MCU for series installation  Excl. S1NEK single port MCU – right side connection only  No condensate drain  Auto addressing

S1NEK1N

S2NEK2N

S4NEK3N

S6NEK2N

27

Heat Recovery Introduction Mode Change Units – S*NEK

Low pressure gas Refrigerant pass through design 2,4&6 port models

High pressure gas Liquid

Liquid & dual pressure gas ports to indoor units

28

Heat Recovery Introduction Cooling Operation

 Hot gas bypass valve 2 open condition  20 mins. In cooling  Cooling oil recovery  System stop in 2 mins. 30 sec. (pressure equalization)

30 sec. open then close

E

s E

s s

E

E

E

s

E

s s

Low temperature & pressure gas High temperature & pressure gas High temperature & pressure liquid

E

E

28

Heat Recovery Introduction Video

30

Heat Recovery Introduction Main Cooling Operation Cooling

E

s s

E

s

E

E

Heating E

s

E

s s

Low temperature & pressure gas High temperature & pressure gas High temperature & pressure liquid

E

E

29

Heat Recovery Introduction Video

32

Heat Recovery Introduction Heating Operation Heating E

s s

E

s

E

E

E

s

E

s s

Low temperature & pressure gas High temperature & pressure gas High temperature & pressure liquid

E

E

30

Heat Recovery Introduction Video

34

Heat Recovery Introduction Main Heating Operation Heating E

s s

E

s

E

E

Cooling E

s

E

s s

Low temperature & pressure gas High temperature & pressure gas High temperature & pressure liquid

E

E

31

Heat Recovery Introduction Video

36

DVM S Indoor Unit Control

Indoor Unit Control Indoor Unit Component Diagram IDU Controlled Devices  Fan – On/Off & Speed  Electronic Expansion Valve  Condensate Lift Pump (specific units) Control Components  Temperature thermistor sensors  Main PCB  Remote Controller (wired or wireless)

Example: 4-Way Cassette PCB

Coil outlet sensor (Gas) I N

FAN

D O O R

Discharge sensor

Return air sensor

C O

NOTE: Discharge sensor is optional on ducted IDU’s

I

EEV

Example: MWR-WE11N

L

Coil inlet sensor (Liquid)

38

Indoor Unit Control Fan Speed Control  Fan speed control step User control - Ultra Low: minimum step( * non feedback type : 5 step + Low step x 0.25)

System

- Low Low: Low – 1 step ( * 1step : about 20rpm)

control

- High High: High + 1 step - Ultra High: High + 2 step

 Quiet Mode reduces the sound level from the fan motor during cooling or heating operation  Fan feedback indoor unit (ex. RAC, 1way, 2way, 4way) - Current Fan speed -1 step (1step = about 20 rpm) 

Fan non feedback indoor unit (ex. duct) - H  M , M  L , L  L

39

Indoor Unit Control Fan On/Off Control – Thermo-off Condition

Mode

Cooling

Thermo

EEV

Fan

“02” SEG4 setting

“02” SEG 4

External room s/s

Minimizing fan operation

ON

Open

On

0,1,2,3

0

Disuse

Disuse

OFF

Closed (0 or 35)

On

0,1,2,3

1

Use

Disuse

Off

4,5,6,7

2

Disuse

Use-Heating

Open

On

0

3

Use

Use-Heating

Off & On(20°F↑)

0,4

4

Disuse

Use-Cooling

Off & On (20°F↑, 20sec on every 5mins)

2,6

5

Use

Use-Cooling

6

Disuse

Use-Both

Off

1,3,5,7

7

Use

Use-Both

ON

Heating

OFF

Open 120 step

40

Indoor Unit Control Fan Speed Control – Cold Air Prevention (Heat Mode)  On a heat thermo-On, the fan operation is delayed until the indoor coil reaches 82.4°F  This is a default function and cannot be deactivated Airflow in heating mode

Indoor coil temperature. 100.4°F

High or lower

96.8°F 93.2°F

Mid or lower Low

89.6°F

Mid or lower

86°F 82.4°F 79°F 68°F

High or lower

Low Low Fan off

Low Low Low Fan off

41

Indoor Unit Control Cool & Heat Thermo On & Off Operation  Cooling Operation Thermo on : Room temp. ≥ Set temp. Thermo off : Room temp. ≤ Set temp. -1

on

Thermo on

Tset Tset-1 Thermo off

Thermo off

 Heating Operation Thermo on : Room temp. ≤ Set temp. - 1 + T°F Thermo off : Room temp. ≥ Set temp. + T°F

Thermo off

Thermo off

Tset + T°F Tset-1 + T°F on

Thermo on

42

Indoor Unit Control Heating Compensation Temperature 

T°C = Heating compensation temperature 

Factory default (product code SEG6)  



4-Way type: Others:

T℃ = 9°F T℃ = 3.6°F

Installation Setting (option code SEG21)

 When using remote controller built-in room sensor – Installation option: SEG4=1 

T℃ = 0°F

 When wired R/C built-in sensor is set as “use” then T℃ = 0°F regardless of SEG4 setting  Priority: Wired R/C built-in sensor use = Ext. Room Sensor setting > Installation Option > Product Option 

If higher priority setting is applied, lower will be ignored

43

Indoor Unit Control Indoor Unit Operation Mode Mode

Fan speed

EEV

Fixed – Auto

Auto mode

Difference between Set temp. & Room temp.)

Control

Low: 1°F ≤ Mid ≤ 3°F : High

Cooling mode Dry mode Heating mode Turbo mode (while Cooling/Heating) Fan mode Defrost Oil recovery

User input (Low, Mid, High, Auto) Fixed - Auto (Low / Low Low)

User input (Low, Mid, High, Auto)

Control Control Control

Fixed – High or Turbo

Control

User input

Fixed

(Low, Mid, High)

(Close)

Stop Turn on: User selected Turn off: Stop

Fixed (Open)

Control

Setting temp. range 18~30℃ (65~86℉) 18~30℃ (65~86℉) 18~30℃ (65~86℉)

16~30℃ (61~86℉) Unable

Remark User selection

User selection User selection User selection Operating for 30mins then return to previous

-

User selection

-

System

-

System

44

Indoor Unit Control Indoor Coil Freeze Protection Control  

Purpose: To prevent indoor coil freeze up due to abnormally low coil temperature Process: Hz Hold Hz Down HP Down (no error code for freeze protection) Start Evap temp＜35.6°F for 40 sec.

Hz Hold

Evap temp＜ 32°F for 40 sec.

Evap temp＞ 39.2°F → Return to normal control Hz down

After 2 min.

Evap temp ≥ 32°F → Holding current Hz Evap temp＜ 32°F → 5Hz down * Minimum Hz : HGV on

Evap temp＜ 28.4°F for 40 sec.

HP down

Evap temp ＞ 39.2°F → Return to normal control

END

45

Indoor Unit Control Auto Mode - Default  Initial operation mode determination If Room Temp. ≥ Set Temp. – 1°F

If Room Temp. < Set Temp. – 1°F

 Auto cooling mode

 Auto heating mode

 Thermo-On/Off 

Thermo-On/Off is same in cooling & heating mode

 When mode change is carried out Model

Heat pump

Heat recovery

Condition

1&2&3

1 or 2 or 3

1. Thermo off for 30 mins 2. Only 1 IDU is turned on. 3. IDU product option change Detail

“Seg 5 current + 2” ex) 014046-194XXX  014066-194XXX

1. Thermo off for 30 mins 2. IDU Set temp. change 3. Follow the installation option setting * refer to the next page for “3”

* If more than 2 IDUs are turned on, IDU mode will follow the ODU operation mode.

46

Indoor Unit Control Auto Mode – Auto Changeover Setting For Heat Recovery

A

D

B

C

T

47

Indoor Unit Control Auto Mode – Auto Changeover Setting For Heat Recovery

77°F

Setting

Value

0

1

2

3

4

5

6

7

A

Heating offset

SEG4

0

0.5

1

1.5

2

2.5

3

3.5

B

Cooling offset

SEG5

0

0.5

1

1.5

2

2.5

3

3.5

C

Heat  cool

SEG6

1

1.5

2

2.5

3

3.5

4

4.5

D

Cool  heat

SEG8

1

1.5

2

2.5

3

3.5

4

4.5

T

Time

SEG9

5

7

9

11

13

15

20

30

Start

Cooling Thermo off (Tr15

30 20 10

Max=10 min 2min

0 0 Pump Down

4 Soft Start

Mild Start

8

12

16

20

Safety start

58

Outdoor Unit Control 104

78.8

95

75.2

86

Room temp. (°F)

Room temp. (°F)

Quick Start (≥ 30% Indoor Unit Capacity Required)

Cooling Quick Start

77 68

Ambient temp. (°F)

59 59

68

77

86

95

104

113

Heating Quick Start

71.6 68 64.4 60.8 57.2 -13

Ambient temp. (°F) -4

5

14

23

32

41

50

59

59

Outdoor Unit Control Compression Ratio Control  

Purpose: Protect the compressor from abnormal operation Process: Hz Hold Hz Down HP Down Compressor stop (E428)  

Max. compression ratio: to limit capacity Min. compression ratio: to maintain lubrication PSI.

 Compression Ratio = (High pressure + 14.7psi) / (Low pressure +14.7psi) (Absolute pressure = Gauge pressure + 14.7psi)

(Example) Compressor spec Compression ratio

640

HP down

568.93

8.5

497.82

Hz down

426.7

7.4

355.6

7.0

Hz hold

284.47 213.35

1.7

142.23

Minimum Hz limitation

71.12

1.5

0

PSI. 0

SH (7°F) control

28.45 56.89 85.34 113.79 142.23 170.68 99.13 227.57

Comp stop [E428]

60

Outdoor Unit Control Control Logic – Dual Compressors Starting   

Comp 2: Hz=Comp 1 + offset Offset: Max. 10 Hz Major condition for next compressor starting (1or2)   

Comp 2

Comp. Hz > 76Hz Comp. Hz > 60 Hz for 3 mins. Without unit stop Comp. Hz > 70 Hz for 3 mins. When unit stop

Comp 1

Control Logic – Additional Compressor Starting Comp1 on + Comp 2 start Comp 2

Comp 1

Comp 2 on + Comp 1 start Comp 2

Comp 1

61

Outdoor Unit Control Operating Priority Main

Sub 1

Sub 2

INV1

INV2

Modular System 2 or 3 ODU’s connected together on the same refrigerant network

 Compressor priority in a unit

 Master unit priority  At initial starting from power supply

 Which one is off longer

 ODU address setting (Main - Sub1 - Sub2)

 INV1 at initial starting from power supply

 Master unit rotation  1- After defrost / oil recovery / all unit off (Master unit operates more than 60mins)  2 - Any unit is stopped over 40 min. Main Master Sub2 Sub1

Sub1 Sub1 Master Sub2

Sub2 Sub2 Sub1 Master

 Additional compressor starting condition  Over 60Hz & over 3mins operation  Over 76Hz operation  Efficiency of 30~80Hz is better than higher frequency  Each unit will decide individually

62

Outdoor Unit Control Compressor Capacity Control  

Equal frequency in a unit: max. 10Hz difference Equal capacity in a module: Capacity division by unit capacity, control all compressor frequency difference within 20Hz 38 HP System Equivalent capacity in module

Main unit (22HP)

Sub 1 unit (16HP)

High efficiency Oil balance

1

3

2

4

Equal Hz in a unit

Example) Required capacity = 273,000 Btu/h Main unit Compressor Module Capacity [Btu/h]

Comp 1 (64cc)

Sub 1 unit

Comp 2 (64cc)

Comp 1 (52cc)

Comp 2 (52cc)

273,000: *22/38 = 158,000

273,000: *16/38 = 115,000

Comp Capacity [Btu/h]

79,000

79,000

57,500

57,500

Frequency

70 Hz

70 Hz + α

62 Hz

62 Hz + α

63

Outdoor Unit Control System Pump Down – Cooling (Heat Pump) To minimize liquid flood back in the system on next start, pump down or pump out is initiated after ODU stop

64

Outdoor Unit Control System Pump Out – Heating (Heat Pump) To minimize liquid flood back in the system on next start, pump down or pump out is initiated after ODU stop

65

Outdoor Unit Control Heat Recovery – Operating Mode Determination Main Cooling Mode

Heating Capacity Ratio Hysteresis range : Max. range : -15% ~ 20%

0%

Cooling Mode

A%

Hysteresis A

100 %

B%

Criterion of HCR

Hysteresis B

Heating Mode

Main Heating Mode Ave. heating Indoor room temp. : 68°F Ave. cooling Indoor room temp. : 75.2°F Indoor operating ratio : 50%

※ Heating capacity ratio = Σ(Heating) / {Σ(Heating) + Σ(Cooling)} 100 90 80

Criterion of HCR  Factor : Ambient temp. IDU’s operating ratio, room temp. Mode changeover in hysteresis  Remaining 30 min in hysteresis area, mode changeover carry out

70

HCR[%]

 Value to decide mode of Heat Recovery

60 50 40 30 20 10 0

Outdoor Temp[°F]

5 14 23 32 41 50 59 68 77 86 95104 113 122

66

Outdoor Unit Control Capacity Control - Cooling Compressor frequency is controlled by the target low pressure which is changed by the averaging of evaporator inlet temperature Low pressure < Target low pressure < Low pressure Excessive capacity

Insufficient capacity

Target low pressure (psi) 85.34

Comp Hz down

Comp Hz up

Capacity decreasing

Capacity increasing

106.68

113.78

120.89

128

- avg. evap. Inlet temp. = setting  target low press maintain Target low pressure

Hz Up

- avg. evap. Inlet temp. < setting  target low press increase - avg. evap. Inlet temp. > setting  target low press decrease

Why is evaporator inlet temp used to find target low pressure?  To compensate piping length between the ODU and IDU’s

ODU Option Settings (Capacity correction) Seg1

L.P : 113.78 psi

99.56

* Default value of target low pressure: 113.78 psi

Hz Down Hz Up

92.45

L.P :118 psi

L.P : 122 psi

L.P : 127 psi

Evap in : 46°F

Evap in : 48°F

Evap in : 50 °F

Main ODU

0

Seg2

Seg3

Seg4

Temperature

1

0 0 0 0 0 0 0

0 1 2 3 4 5 6

45°- 48°F 41°- 45°F (Default) 48°- 52°F 50°- 54°F 52°- 55°F 54°- 57°F 55°- 59°F

67

Outdoor Unit Control Capacity Control - Heating High pressure < Target high pressure < High pressure Seg1

Insufficient capacity

Seg3

Seg4

Pressure (psi)

2

0 0 0 0 0 0 0 0 0

0 1 2 3 4 5 6 7 8

426.7(default) 355.6 369.8 384 398.25 412.48 440.9 455.15 469.4

Excessive capacity

Comp Hz up

Comp Hz down

Capacity increasing

Capacity decreasing

Target high pressure control ODU option setting

Main

0

Hz down Hz up

Target high pressure High pressure

Air In

111F

Air Out

Ex) option : 02 (377 psi : saturated temp ≒ 111°F)

122°F

H/X

H/X

Air In

Ex) option : 00 (435 psi : saturated temp ≒ 122°F)

Air Out

Hz up

Seg2

68

Outdoor Unit Control Outdoor Unit Fan Control Cooling Fan rpm increase

Fan rpm decrease

Target high pressure

ODU setting

Target high pressure for cooling

Default

355.6 psi

ODU lowest setting Menu08 / value03

398.25 psi

Ambient temp. (°F)

Target low pressure for heating

Below 32

106.7 psi

32 ∼ 50

116.63 psi

50 ∼ 68

119.47 psi

68 ∼

123.74 psi

Heating Fan rpm decrease Fan rpm increase

Target low pressure

69

Outdoor Unit Control EVI – EEV Control Purpose: To increase sub-cool of system : Sub-cool ↑  Efficiency ↑

EVI On(Vapor Injection) mode Remark

*Condition

Open

Open

Open

Normal

Open

Open

Close

Close

Open

Open

All comp in unit 60hz ↑ T out < 96.8(c)/50(h)°F * Control by unit Safety start Defrost

Cooling

Heating

3 s

E

EVI Bypass mode

EVI Bypass

IPM2 IPM1

EVI mode

EVI Sol

1

s

EVI Bypass mode EVI On mode (Vapor Injection) EVI Off mode

EVI EEV

E

Valve

2

s

Cooling Vapor injection not working when ODU option 8 : ODU higher ODU option 9 : Long pipe

▷ SH control ▷ Sub-cooling control : 68°F ( High pressure Saturated temp. – Liquid tube temp.)

1. EVI out temp. – EVI In temp. > 50°F (priority) 2. T dis = 194°F ▷SH ( EVI out temp. – EVI in temp.) control : 3.6°F

If compressor discharge temp. is abnormally high, open EVI EEV to decrease the discharge temperature

70

Outdoor Unit Control Main EEV Control - Heating ▶ Main EEV control

EEV control period : every 20s In heating mode

① Stop ODU : Main EEV close ② Cooling ODU : Main EEV Full open

DSH normal

No

Yes Module installation

DSH protection control

No

▶ Main EEV control for module install 1. Refrigerant distribution between ODUs 2. Then Super Heat control (SH) 3. If discharge temp is high  EEV step increases

Yes Low pressure equal between ODUs

Yes Low pressure equalization control

No Target SH control Single install : 35.6°F

Target SH control * SH = super heat (Suction temp. – Low pressure saturated temp.) * DSH = Discharge super heat (discharge temp. – high pressure saturated temp.)

Module install : 41°F EEV control repeat

71

Outdoor Unit Control Accumulator Oil Return Valve - ARV From EVI EEV 4Way valve Compressor

Refrigerant

ARV control

Stop

Close - Prevent refrigerant flowing to compressor

Starting

Close - Prevent refrigerant flowing to compressor

Running

Open - Oil return to compressor

Oil

ARV oil

NOTE: Compressor damage can occur if the ARV fails due to a lack of compressor oil return

72

Outdoor Unit Control Compressor Oil Recovery Operation 

Oil recovery operation starts after a cumulative compressor run time of 7 hours  The oil recovery interval will shorten if the outdoor unit or compressor stops

 

If defrost mode is in operation for more than 3 minutes, it counts as oil recovery operation as well In a modular system (manifolded ODU’s) on completion of oil recovery operation the master ODU will change

Before Cooling

Heating

Oil Recovery Cooling

Heating

After Cooling

Heating

Capacity of compressor

Current capacity + additional capacity

ODU fan

Normal control

ODU EEV

Normal control

EEV of operating indoor units

Higher step of [400(C)/300(H) or Current step]

Stopped indoor unit’s EEV

400(C)/300(H)

Time

3min(Cool) / 6min(Heat)

73

Outdoor Unit Control Hot Gas Bypass Valve  Hot gas bypass valve compensates for abnormal low pressure  Open status E

 Safety start  Low pressure protection control

On (psi)

≤ 45.51

≤ 19.91

Off (psi)

≥ 59.74

≥ 34.14

s

E

Heating

IPM2

IPM1

Cooling

s

Valve control

s

Hot Gas bypass valve

74

Outdoor Unit Control High Pressure Protection  

Purpose: To protect the compressor and system from excessive high pressure Process: Hz hold Hz down HP down Compressor stop (E407)

Compressor Stop = E407 High Pressure 568.93 psi

HP Down area High Pressure

HP Down release

540.49 psi

Hz Down area High Pressure

Hz Down release

526.26 psi

Hz Hold area High Pressure

Hz Hold release

512 psi

Normal Operation High Pressure 426.7 psi

Compressor Stop Release

75

Outdoor Unit Control Low Pressure Protection   

Purpose: To protect the compressor and system from abnormal low pressure Process: Hz hold Hz down HP down Compressor stop (E410) Compressor stop release: 3 mins. & low pressure 64 (cool) / 42.67 (heat) psi Auto restart (6 X max.) Heating

Operation

Cooling

Operation

Outdoor temp.

Pressure (psi)

Over 59°F

≤ 56.9

Less than 59°F

≤ 42.67

Over 59°F

≤ 49.78

Less than 59°F

≤ 35.56

Over 59°F

≤ 36.98

Less than 59°F

≤ 22.76

Hz Hold

Hz Hold

Hz Down

Hz Down

HP Down

Comp Down [E410]

≤ 11.38 for 3mins & dis temp 194°F↑

HP Down

Outdoor temp.

Pressure (psi)

Over 32°F

≤ 42.67

32°F~14°F

≤ 28.45

Less than 14°F

≤ 25.6

Over 32°F

≤ 31.29

32°F~14°F

≤ 22.76

Less than 14°F

≤ 17.07

Over 32°F

≤ 25.60

32°F~14°F

≤ 17.07

Less than 14°F

≤ 11.38

Comp Down [E410]

≤ 7.11 for 3mins & dis temp 194°F ↑

76

Outdoor Unit Control Discharge Temperature Protection  

Purpose: To protect the compressor and system from abnormal discharge temperature Process: ESC EEV Open Hz Hold Hz Down HP Down Comp Stop (E416)

Compressor Stop = E416 Discharge Temp. 248°F HP / Hz Down area Discharge Temp. 221°F

HP Down release Hz Hold area

Discharge Temp. 212°F

Hz Down release EVI EEV Open

Discharge Temp. 203°F

Hz Hold release Normal Operation

Discharge Temp. 176°F

Compressor Stop Release

77

Outdoor Unit Control Intelligent Power Module (IPM)  

Purpose: Protect the IGBT (Insulated Gate Bipolar Transistor) module from damage IGBT is a 3 terminal power semiconductor device functioning as an electronic switch 

The switching function controls the compressor frequency rate which in turn creates heat

IMP temperature

. Hz Hold: Hold current Hz (Hz reduction possible) . Hz Down: Decrease 5 Hz / control period . HP Down: Decrease 1 Hz / sec

Compressor stop(E400 / E500)

212°F 100 ℃ HP Down area 98℃ 208°F

Compressor stop(E400 / E500), if condition remains for 10 min.

HP Down release Hz Down area Hz Down release

199°F 93℃ Hz Hold area 194°F 90℃

Hz Hold release

Compressor stop release

Normal operation

78

Outdoor Unit Control Inverter PCB Input Current Control Purpose: Inverter input current is controlled to protect circuit components from failure

INV PBA Input (A)

Compressor stop (E462) Comp stop

. Hz Hold: Hold current Hz (Hz reduction possible) . Hz Down: Decrease 5 Hz / control period . HP Down: Decrease 1 Hz / sec

HP Down area HP Down release

HP down

Hz Hold area Hz hold

Hz Hold release

(HP down – 1A)

Normal operation

79

Outdoor Unit Control Current Control Purpose: To protect the IPM module from overheating Reason: Outdoor temp increases IPM temp increases

Max. Hz limitation

In case of fan type IPM

OD 113°F OD 104°F OD 95°F

194°F

Cooling Current [A]

 

Comp down 2A Hz Down

Hz Hold Max HZ limitation by IPM temp Default

Max Hz

86

122

OD temp. (°F)

80

Outdoor Unit Control Maximum Current Control 

Outdoor Unit option setting: 50% - 100%  Hz Hold: Compressor current + Fan current > 95% of setting current  Hz Down: Compressor current + Fan current > setting current

 

100%=Maximum current (MCA) of the system Setting: Outdoor unit option setting or DMS2 setting range (50% to 100%) Max current

Setting of Max. current

. Hz Hold: Hold current Hz (Hz reduction possible) . Hz Down: Decrease 5 Hz / control period . HP Down: Decrease 1 Hz / sec HP Hold area

80% Capacity range

Range

Capacity range

50%

Required capacity

100%

HP Hold area 95 %

81

Outdoor Unit Control Inverter PCB Current Control Inverter PCB input current is controlled to protect circuit components from failure INV PCB Input (A)

Compressor stop (E462) Comp stop

HP Down area HP down

HP Down release Hz Hold area

Hz hold

Hz Hold release

(HP down – 1A)

Normal operation

82

Outdoor Unit Control Refrigerant Overcharge - Cooling 

System will run in normal operation until it is above regulated capacity High pressure protection control High pressure will be increased due to INV frequency increase

INV frequency goes to lowest setting

Increase sub cooling (Liquid piping temp decreases)

High pressure

Keep constant low pressure

Low pressure Low pressure is increased When INV frequency decreases

Inverter frequency Increases INV frequency to try to maintain low pressure Overcharge condition progression

83

Outdoor Unit Control Intelligent Defrost Optimal judgement for initiating defrost operation

MBtu/h

Btu/h 102,000 30000

14°F heating

30000 102,000

68,000 20000

20000 68,000

Defrost

34,000 10000

0

Conventional Intelligent

14°F heating

Conventional

Defrost

0 0

60

120

minutes

180

[Outdoor Temp. : 14°F DB, (Humidity 40%)] [Indoor Temp. : 68°F DB]

Time & Temp initiated defrost  Unnecessary defrost

240

300

10000 34,000

00 0

[min]

60

120

180

240

300

[Outdoor Temp. : 14°F DB, (Humidity 40%)] [Indoor Temp. : 68°F DB]

Time & Temp & Sensing heat exchanger air resistance value  Continuous Heating operation

84

Outdoor Unit Control Intelligent Defrost Test condition

Test result

- Installation 24HP Outdoor for each zone.

* Only 2 defrost cycles for 10 days Intelligent Defrost

24HP

Normal Defrost

24HP

Intelligent

Conventional

Defrost

Defrost

Total Operating time(min)

12,130

11,568

Defrost operation(times)

2

19

6,065

608

Result

Average Heating Operation without defrost(min)

85

Outdoor Unit Control Rotation Defrost Operation - Heat Recovery  Module systems (2 or 3 connected units) – Defrost operation is actuated in sequential order to improve heating efficiency  Operation requires option setting at commissioning

Actuator

Outdoor units in defrost mode

Units not being in defrost mode

Compressor

Depends on the outdoor unit capacity (86-110Hz)

General control

Outdoor EEV Outdoor Fan HR EEV

Full close 0 step Off

General control General control General control

Main cooling valve

ON

General control

Active unit Inactive unit Indoor EEV Active unit Heating Indoor unit Inactive unit Active unit Cooling indoor unit Inactive unit Indoor Fan Active unit Heating Indoor unit Inactive unit Time Cooling indoor unit

General control Required step for control of the superheat degree General control General control on inactive units General control Set fan speed Mid fan speed Off Maximum of 12 min -

86

Outdoor Unit Control Rotation Defrost Operation - Heat Recovery

87