Electra DNC series Service Manual

DNC series

REFRIGERANT

R22
R4O7C

HEAT PUMP

COOLING ONLY

JULY 2005

Service Manual

Indoor Units Outdoor Units

DNC 35 (955) OU8-33 R22/R407C

DNC 38 (1155) OU10-38 R22/R407C

DNC 44 (1255)

OU10-44 R22

OU10-50 R407C

A

LIST OF EFFECTIVE PAGES

Revision Y05-01

Service Manual - DNC Series

LIST OF EFFECTIVE PAGES

Note: Changes in the pages are indicated by a “Revision#” in the footer of each effected page

(when none indicates no changes in the relevant page). All pages in the following list represent
effected/ non effected pages divided by chapters.

Dates of issue for original and changed pages are:

Original ....... 0 ........ July 2005

Total number of pages in this publication is 139 consisting of the following:

Page
No.

Revision
No. #

Page
No.

Revision
No. #

Page
No.

Revision
No. #

Title ....................... 0

A ........................... 0

i ............................. 0

1-1 - 1-2 ................ 0

2-1 - 2-10 .............. 0

3-1 ........................ 0

4-1 - 4-2 ................ 0

5-1 - 5-41 .............. 0

6-1 - 6-3 ................ 0

7-1 - 7-5 ................ 0

8-1 - 8-34 .............. 0

9-1 - 9-2 ................ 0

10-1-10-21 ............ 0

• Zero in this column indicates an original pag

*Due to constant improvements please note that the data on this service manual can be modified with out notice.
**Photos are not contractual.

i

TABLE OF CONTENTS

Revision Y05-01

Service Manual - DNC Series

Table of Contents

1. FEATURES ............................................................................................................1-1

2. PRODUCT DATA SHEET ......................................................................................2-1

3. RATING CONDITIONS ..........................................................................................3-1

4. OUTLINE DIMENSIONS .......................................................................................4-1

5. PERFORMANCE DATA & PRESSURE CURVES ................................................5-1

6. REFRIGERATION DIAGRAMS .............................................................................6-1

7. WIRING DIAGRAMS .............................................................................................7-1

8. CONTROL SYSTEM .............................................................................................8-1

9. TROUBLESHOOTING ..........................................................................................9-1

10. EXPLODED VIEWS AND SPARE PARTS LISTS .................................................10-1

1-1

FEATURES

Revision Y05-01Service Manual - DNC Series

1. FEATURES

MODES OF OPERATION , FUNCTIONS AND FEATURES

The air conditioner is based on a microcomputer control system with remote wall mounted LCD display
and control unit, programmed for the following modes and functions

:

Cools, dehumidifies and filters the room air. Maintains desired site temperature.

COOL

Heats and filters the air. Maintains desired site temperature.

HEAT

Automatically switches from COOLING to HEATING or from HEATING to
COOLING, maintaining the desired temperature according to the room
conditions.

AUTO

Dehumidifies and moderately cools the room. In DRY Mode the air conditioner
operates at an increased dehumidifying power. This function is recommended to
be used when temperature is rather cool but the humidity is high.

DRY

Recalculates and filters the room air. Maintains constant air movement in the
room.

FAN

The air conditioner automatically selects the FAN speed in accordance to the

room temperature. At the start, the unit operates at high fan speed. As the
room air gets closer to the desired temperature, the fan switches on a lower
speed for quieter operation.

AUTO FAN

In HEATING and in AUTO FAN, the fan will be turned off when the compressor
is not in operation and will not be restarted, unless the indoor coil reaches
adequate temperature. This HOT KEEP feature prevents uncomfortable cold air
drafts. AUTO FAN Is therefore, recommended to be used when the air
conditioner is in HEATING mode.

HOT KEEP

Switches the temperature sensing point to the place where the remote control is
located (in normal operation the temperature sensor is located behind the intake
grille of the air conditioner). This function is designed to provide a personalized
environment by transmitting the temperature control information from where the
remote control is placed. The communication between the remote control and
the central control unit is done by infrared signal. When using this function, the
remote control should always be aimed without obstructions at the air
conditioner.

I FEEL

Real time control and display, automatically turns the air conditioner ON or OFF
according to the time of day setting, ensuring comfort conditions before
returning home, without wasting electricity. It turns off the air conditioner
automatically when sleeping.

TIMER

Designed to automatically reset the temperature setting. In COOLING mode the
temperature rises one degree centigrade after each consecutive hour, up to
three hours, from the start of the mode. In HEATING mode, the reverse occurs,
the air conditioner lowers its temperature one degree every hour. When in
SLEEP Mode, the operation will automatically turn off after seven hours. This
function saves energy when the air conditioner is operating during off hours.

SLEEP

1-2

FEATURES

Revision Y05-01 Service Manual - DNC Series

Measures and displays room temperature.

ROOM TEMP.

Filter indicator on the indoor unit display is turned on when the filter requires
cleaning. After cleaning and reinstalling the filter, the system should be reset.

FILTER

INDICATION

A soft buzzer will sound from the indoor unit display to indicate that a
command sent by the remote control has been accepted and stored in the
unit’s memory. This feature may be easily canceled by the user from the
display panel.

BUZZER

The air conditioner can be turned ON for COOLING or HEATING or be
turned OFF directly from the indoor unit display panel without the use of the
remote control.

ON UNIT

OPERATION

The compressor is protected by a three minute delayed restart.

3-MIN

DELAYED

RUN

The microprocessor retains the last data entry whether or not the unit is
plugged in. Therefore, when the unit restarts after a power disruption or power
failure, it will resume operation in the same mode as before the power
disruption.

MEMORY

Freezes the last operation setting on the remote control. When LOCK is
activated, the remote control will not be able to control the air conditioner.

LOCK

2-1

PRODUCT DATA SHEET

Revision Y05-01Service Manual - DNC Series

2. PRODUCT DATA SHEET

2.1 R22 / R407C

DNC 955 R22

Model

Ceiling Mounted

Installation method

HeatingCoolingUnits

Characteristic

3200031060Btu/hr

93809100W

Capacity

28403370WTotal input

3.302.7W/W COP

230V/50Hz/1 Power supply (voltage, cycle, No of phases)

12.3 14.6ARated current

20ACircuit breaker rating

Plug Fan x 1 Fan type & qty.

500 550 700 RPM Fan speed (HI-M-LO)

120013301700m³/hr

7057801000CFM

Airflow (LO-M-HI)

20-80PaStatic Pressure

51.354.857.2dBANoise Power**

44.647.551.8dBANoise Pressure*

3.1l/hDehumidification

16mmCondensate drain tube I.D

1025mmWDimensions

760mmD
300mmH

43KgWeight

1125x975x360(Unit)+1180x870x180(Frame)mmPackage dimensions

I
N
D
O
O
R

U
N

I
T

7units Stacking height
7units Units per palet

Capillary TubeRefrigerant control

SCROLL LG SQ040PA Compressor type & model

Axial Fan type & qty.

850RPM Fan speeds

3100m³/hr
1820CFM

Airflow (std. conditions)

62/69dBANoise Pressure*/ Noise Power

900mmWDimensions
340mmD

860860

mm

H

82KgWeight

903x985x406 mmPacking dimensions

2units Stacking height
6units Units per palet

R22Refrigerant

O

U
T
D
O

O

R

U
N

I
T

16mmCondensate drain tube I.D
3/8”in.liquid
5/8”in.suction

10mheight differenceConnection between units
30mmtubing length

T
U
B
E

S

LCD Remote ControlOperation control type

2x750 WHeating elements

8”,10”,12” Ducts

Crankcase heater 60WOthers

A
C
C.

* Noise pressure tested at 1m distance from unit
** Noise power for ducted units measured at air outlet side

860

Charge for 7.5 meter pipes length

Grams

2450

2-2

PRODUCT DATA SHEET

Revision Y05-01 Service Manual - DNC Series

DNC 955 3PH

Model

Ceiling Mounted

Installation method

HeatingCoolingUnits

Characteristic

3200031060Btu/hr

93809100W

Capacity

27603320WTotal input

3.402.74W/W COP

400V/50Hz/3Power supply (voltage, cycle, No of phases)

3x7.33x8.7ARated current

20ACircuit breaker rating

Plug Fan x 1 Fan type & qty.

500550 700 RPM Fan speed (HI-M-LO)

120013301700m³/hr

7057801000CFM

Airflow (LO-M-HI)

20-80PaStatic Pressure

51.354.857.2dBANoise Power**

44.647.551.8dBANoise Pressure*

3.1l/hDehumidification

16mmCondensate drain tube I.D

1025mmWDimensions

760mmD
300mmH

43KgWeight

1125x975x360(Unit)+1180x870x180(Frame)mmPackage dimensions

I
N
D
O
O
R

U
N

I
T

7units Stacking height
7units Units per palet

Capillary TubeRefrigerant control

SCROLL LG SQ040YACompressor type & model

Axial Fan type & qty.

850RPM Fan speeds

3100m³/hr
1820CFM

Airflow (std. conditions)

62/69dBANoise Pressure*/ Noise Power

900mmWDimensions
340mmD

mmH

82KgWeight

903x985x406 mmPacking dimensions

2units Stacking height
6units Units per palet

R22Refrigerant

Charge for 7.5 meter pipes length

O

U
T
D
O

O

R

U
N

I
T

16mmCondensate drain tube I.D
3/8”in.liquid
5/8”in.suction

10mheight differenceConnection between units
30mmtubing length

T
U
B
E

S

LCD Remote ControlOperation control type

2x750 WHeating elements

8”,10”,12” Ducts

Crankcase heater 60W,3PH ProtectorOthers

A
C
C.

* Noise pressure tested at 1m distance from unit
** Noise power for ducted units measured at air outlet side

Grams

2450

860

2-3

PRODUCT DATA SHEET

Revision Y05-01Service Manual - DNC Series

DNC 955 R407C

Model

Ceiling Mounted

Installation method

HeatingCoolingUnits

Cha racteris tic

3120031060Btu/hr

91409100W

Cap acit y

31503580WTotal input

2.92.54W/W COP

230V/50Hz/1 Power supply (voltage, cycle, No of phases)

13.715.7ARated current

20ACircuit breaker rating

Plug Fan x 1 Fan type & qty.

500550 700 RPM Fan speed (HI-M-LO)

120013301700m³/hr

7057801000CFM

Airflow (LO-M-HI)

20-80PaStatic Pressure

51.354.857.2dBANoise Power**

44.647.551.8dBANoise Pressure*

3.1l/hDehumidification

16mmCondensate drain tube I.D

1025mmWDimensions

760mmD
300mmH

43KgWeight

1125x975x360(Unit)+1180x870x180(Frame)mmPackage dimensions

I
N
D
O
O
R

U
N

I
T

7units Stacking height
7units Units per palet

Capillary TubeRefrigerant control

SCROLL HQ040PACompressor type & model

Axial Fan type & qty.

850RPM Fan speeds

3100m³/hr
1820CFM

Airflow (std. conditions)

62/69dBANoise Pressure*/ Noise Power

900mmWDimensions
340mmD

8860860

mmH

82KgWeight

903x985x406 mmPacking dimensions

2units Stacking height
6units Units per palet

R 407CRefrigerant

GramsCharge for 7.5 meter pipes length

O

U
T
D
O

O

R

U
N

I
T

16mmCondensate drain tube I.D
3/8”in.liquid
5/8”in.suction

10mheight differenceConnection between units
30mmtubing length

T
U
B
E

S

LCD Remote ControlOperation control type

2x750 WHeating elements

8”,10”,12” Ducts

Crankcase heater 60WOthers

A
C
C.

* Noise pressure tested at 1m distance from unit
** Noise power for ducted units measured at air outlet side

2520

2-4

PRODUCT DATA SHEET

Revision Y05-01 Service Manual - DNC Series

DNC 955-3PH R407C

Model

Ceiling Mounted

Installation method

HeatingCoolingUnits

Characteristic

3000030000Btu/hr

87908790W

Capacity

30303370WTotal input

2.92.61W/W COP

400V/50Hz/3Power supply (voltage, cycle, No of phases)

3x8.03x8.9ARated current

3x10ACircuit breaker rating

Plug Fan x 1 Fan type & qty.

500 550 700 RPM Fan speed (HI-M-LO)

120013301700m³/hr

7057801000CFM

Airflow (LO-M-HI)

20-80PaStatic Pressure

51.354.857.2dBANoise Power**

44.647.551.8dBANoise Pressure*

3.1l/hDehumidification

16mmCondensate drain tube I.D

1025mmWDimensions

760mmD
300mmH

43KgWeight

1125x975x360(Unit)+1180x870x180(Frame)mmPackage dimensions

I
N
D

O
O

R

U
N

I
T

7units Stacking height
7units Units per palet

Capillary TubeRefrigerant control

SCROLL HQ040YCompressor type & model

Axial Fan type & qty.

850RPM Fan speeds

3100m³/hr
1820CFM

Airflow (std. conditions)

62/69dBANoise Pressure*/ Noise Power

900mmWDimensions
340mmD

860860

mmH

82KgWeight

903x985x406 mmPacking dimensions

2units Stacking height
6units Units per palet

R 407CRefrigerant

Charge for 7.5 meter pipes length

O

U
T
D

O

O

R

U
N

I
T

16mmCondensate drain tube I.D
3/8”in.liquid
5/8”in.suction

10mheight differenceConnection between units
30mmtubing length

T
U
B
E

S

LCD Remote ControlOperation control type

2x750 WHeating elements

8”,10”,12” Ducts

Crankcase heater 60W,3PH ProtectorOthers

A
C
C.

* Noise pressure tested at 1m distance from unit
** Noise power for ducted units measured at air outlet side

Grams

2530

2-5

PRODUCT DATA SHEET

Revision Y05-01Service Manual - DNC Series

DNC 1155 R22

Model

Ceiling Mounted

Installation method

HeatingCoolingUnits

Characteristic

3822537500Btu/hr
1120011000W

Capacity

39004010WTotal input

3.22.8W/W COP

230V/50Hz/1Power supply (voltage, cycle,No of phases)

17.017.4ARated current

25ACircuit breaker rating

Plug Fan x 1 Fan type & qty.

500 550 700 RPM Fan speed (HI-M-LO)

120013301700m³/hr

7057801000CFM

Airflow (LO-M-HI)

20-80PaStatic Pressure

54.85657.2dBANoise Power**

47.549.751.8dBANoise Pressure*

3.5l/hDehumidification
16mmCondensate drain tube I.D

1025mmWDimensions

760mmD
300mmH

44KgWeight

1125x975x360(Unit)+1180x870x180(Frame)mmPackage dimensions

7units Stacking height
7units Units per palet

I
N
D
O
O
R

U
N

I
T

Capillary TubeRefrigerant control

SCROLL ZR47K3-PFJCompressor type & model

Axialx2 Fan type & qty.

1125RPM Fan speeds
4150m³/hr
2440CFM

Airflow (std. conditions)

57/65dBANoise Pressure*/ Noise Power

900mmWDimensions
340mmD
970mmH

95KgWeight

1020x985x406 mmPacking dimensions

2units Stacking height
6units Units per palet

R22 Refrigerant

GramsCharge for 7.5 meter pipes length

O

U
T
D
O

O

R

U
N

I
T

16mmCondensate drain tube I.D
3/8”in.liquid
3/4”in.suction

25mheight differenceConnection between units

50mtubing length

T
U
B
E
S

LCD Remote ControlOperation control type

2x1500 WHeating elements

8”,10”,12” Ducts

Crankcase heater 33W Others

A
C

C.

* Noise pressure tested at 1m distance from unit
** Noise power for ducted units measured at air outlet side

2650

2-6

PRODUCT DATA SHEET

Revision Y05-01 Service Manual - DNC Series

DNrtDNC 1155-3PH R2215hgddffgtdf5-3

Model

Ceiling Mounted

Installation method

HeatingCoolingUnits

Characteristic

3750037200Btu/hr
1100010900W

Capacity

34403900WTotal input

3.152.74W/W COP

400V/50Hz/3Power supply (voltage, cycle,No of phases)

3x9.13x10.3ARated current

3x16ACircuit breaker rating

Plug Fan x 1 Fan type & qty.

500 550 700 RPM Fan speed (HI-M-LO)

120013301700m³/hr

7057801000CFM

Airflow (LO-M-HI)

20-80PaStatic Pressure

54.85657.2dBANoise Power**

47.549.751.8dBANoise Pressure*

3.5l/hDehumidification
16mmCondensate drain tube I.D

1025mmWDimensions

760mmD
300mmH

44KgWeight

1125x975x360(Unit)+1180x870x180(Frame)mmPackage dimensions

7units Stacking height
7units Units per palet

I
N
D
O
O
R

U
N

I

T

Capillary TubeRefrigerant control

SCROLL ZR45KC-TDFCompressor type & model

Axialx2 Fan type & qty.

1125RPM Fan speeds
4150m³/hr
2440CFM

Airflow (std. conditions)

57/65dBANoise Pressure*/ Noise Power

900mmWDimensions
340mmD
970mmH

95KgWeight

1020x985x406 mmPacking dimensions

2units Stacking height
6units Units per palet

R22 Refrigerant

Charge for 7.5 meter pipes length

O

U

T
D
O

O

R

U
N

I

T

16mmCondensate drain tube I.D
3/8”in.liquid
3/4”in.suction

25mheight differenceConnection between units

50mtubing length

T
U
B
E

S

LCD Remote ControlOperation control type

2x1500 WHeating elements

8”,10”,12” Ducts

Crankcase heater 33W,3PH Protector Others

A
C

C.

* Noise pressure tested at 1m distance from unit
** Noise power for ducted units measured at air outlet side

Grams

2650

2-7

PRODUCT DATA SHEET

Revision Y05-01Service Manual - DNC Series

DNC 1155 R407C

Model

Ceiling Mounted

Installation method

HeatingCoolingUnits

Characteristic

3800035000Btu/hr
1110010300W

Capacity

39853950WTotal input

2.762.6W/W COP

230V/50Hz/1Power supply (voltage, cycle,No of phases)

17.317.2ARated current

25ACircuit breaker rating

Plug Fan x 1 Fan type & qty.

500 550 700 RPM Fan speed (HI-M-LO)

120013301700m³/hr

7057801000CFM

Airflow (LO-M-HI)

20-80PaStatic Pressure

54.85657.2dBANoise Power**

47.549.751.8dBANoise Pressure*

3.5l/hDehumidification
16mmCondensate drain tube I.D

1025mmWDimensions

760mmD
300mmH

44KgWeight

1125x975x360(Unit)+1180x870x180(Frame)mmPackage dimensions

7units Stacking height
7units Units per palet

I
N
D
O
O
R

U
N

I
T

Capillary TubeRefrigerant control

SCROLL ZR47KCE-PFJCompressor type & model

Axialx2 Fan type & qty.

1125RPM Fan speeds
4150m³/hr
2440CFM

Airflow (std. conditions)

57/65dBANoise Pressure*/ Noise Power

900mmWDimensions
340mmD
970mmH

95KgWeight

1020x985x406 mmPacking dimensions

2units Stacking height
6units Units per palet

R 407CRefrigerant

Charge for 7.5 meter pipes length

O

U
T
D
O

O

R

U
N

I
T

16mmCondensate drain tube I.D
3/8”in.liquid
3/4”in.suction

25mheight differenceConnection between units

50mtubing length

T
U
B
E
S

LCD Remote ControlOperation control type

2x1500 WHeating elements

8”,10”,12” Ducts

Crankcase heater 33W Others

A
C

C.

* Noise pressure tested at 1m distance from unit
** Noise power for ducted units measured at air outlet side

Grams

2400

2-8

PRODUCT DATA SHEET

Revision Y05-01 Service Manual - DNC Series

DNrtDNC 1155-3PH R407C15hgddffgtd

f

Model

Ceiling Mounted

Installation method

HeatingCoolingUnits

Characteristic

3790035500Btu/hr
1110010400W

Capacity

39403850WTotal input

3.822.7W/W COP

400V/50Hz/3Power supply (voltage, cycle,No of phases)

3x10.43x10.1ARated current

3x16ACircuit breaker rating

Plug Fan x 1 Fan type & qty.

500 550 700 RPM Fan speed (HI-M-LO)

120013301700m³/hr

7057801000CFM

Airflow (LO-M-HI)

20-80PaStatic Pressure

54.85657.2dBANoise Power**

47.549.751.8dBANoise Pressure*

3.5l/hDehumidification
16mmCondensate drain tube I.D

1025mmWDimensions

760mmD
300mmH

44KgWeight

1125x975x360(Unit)+1180x870x180(Frame)mmPackage dimensions

7units Stacking height
7units Units per palet

I
N
D
O
O
R

U
N

I

T

Capillary TubeRefrigerant control

SCROLL ZR47K3E-TDFCompressor type & model

Axialx2 Fan type & qty.

1125RPM Fan speeds
4150m³/hr
2440CFM

Airflow (std. conditions)

57/65dBANoise Pressure*/ Noise Power

900mmWDimensions
340mmD
970mmH

95KgWeight

1020x985x406 mmPacking dimensions

2units Stacking height
6units Units per palet

R 407CRefrigerant

Charge for 7.5 meter pipes length

O

U

T
D
O

O

R

U
N

I

T

16mmCondensate drain tube I.D
3/8”in.liquid
3/4”in.suction

25mheight differenceConnection between units

50mtubing length

T
U
B

E

S

LCD Remote ControlOperation control type

2x1500 WHeating elements

8”,10”,12” Ducts

Crankcase heater 33W,3PH Protector Others

A
C

C.

* Noise pressure tested at 1m distance from unit
** Noise power for ducted units measured at air outlet side

Grams

2800

2-9

PRODUCT DATA SHEET

Revision Y05-01Service Manual - DNC Series

DNC 1255

Model

Ceiling Mounted

Installation method

HeatingCoolingUnits

Characteristic

44700 42500 Btu/hr
13096 12460 W

Capacity

3970 4390 WTotal input

3.32.84W/W COP

400V/50Hz/3 Power supply (voltage, cycle, No of phases)

3 x 10.4 3 x 11.6 ARated current

3 x 16 ACircuit breaker rating

Plug Fan x 1 Fan type & qty.

500 550 830 RPM Fan speed (HI-M-LO)

123013502000m³/hr

7207951176CFM

Airflow (HI-M-LO)

20-80PaStatic Pressure

54.85659.3dBANoise Power** (HI-M-LO)

47.549.753.3dBANoise Pressure* (HI-M-LO)

4.7l/hDehumidification
16mmCondensate drain tube I.D

1025mmWDimensions

760mmD
300mmH

44KgWeight

1125x975x360(Unit)+1180x870x180(Frame)mmPackage dimensions

7units Stacking height
7units Units per palet

I
N
D
O
O
R

U
N

I

T

Capillary TubeRefrigerant control

SCROLL ZR54Compressor type & model

Axial x 2 Fan type & qty.

1125RPM Fan speeds

4150m³/hr
2440CFM

Airflow (std. conditions)

57/65dBANoise Pressure*/ Noise Power

900mmWDimensions
350mmD
970mmH

95KgWeight

1020x985x406 mmPacking dimensions

2units Stacking height
6units Units per palet

R22 Refrigerant

Charge for 7.5 meter pipes length

O
U

T
D
O

O

R

U
N

I

T

16mmCondensate drain tube I.D
3/8”in.liquid
3/4”in.suction

25mheight differenceConnection between units
50mtubing length

T
U
B
E

S

LCD Remote ControlOperation control type

2x1500 WHeating elements

8”,10”,12” Ducts

Crankcase heater 60W,3PH Protector Others

A
C

C.

* Noise pressure tested at 1m distance from unit
** Noise power for ducted units measured at air outlet side

Grams

2660

2-10

PRODUCT DATA SHEET

Revision Y05-01 Service Manual - DNC Series

DNC 1255-3PH R 407C

Model

Ceiling Mounted

Installation method

HeatingCoolingUnits

Characteristic

49500 43000 Btu/hr

1450012600 W

Capacity

5180 5185 WTotal input

2.802.43 W/W COP

400V/50Hz/3 Power supply (voltage, cycle, No of phases)

3 x 13.6 3 x 13.6 ARated current

3 x 16 ACircuit breaker rating

Plug Fan x 1 Fan type & qty.

500 550 830 RPM Fan speed (HI-M-LO)

123013502000m³/hr

7207951176CFM

Airflow (HI-M-LO)

20-80PaStatic Pressure

54.85659.3dBANoise Power** (HI-M-LO)

47.549.753.3dBANoise Pressure* (HI-M-LO)

4.7l/hDehumidification
16mmCondensate drain tube I.D

1025mmWDimensions

760mmD
300mmH

44KgWeight

1125x975x360(Unit)+1180x870x180(Frame)mmPackage dimensions

7units Stacking height
7units Units per palet

I
N
D
O
O
R

U
N

I

T

Capillary TubeRefrigerant control

SCROLL HR61YA Compressor type & model

Axial x 2 Fan type & qty.

1125RPM Fan speeds
4150m³/hr
2440CFM

Airflow (std. conditions)

62/69dBANoise Pressure*/ Noise Power

900mmWDimensions
350mmD
970mmH

95KgWeight

1020x985x406 mmPacking dimensions

2units Stacking height
6units Units per palet

R 407cRefrigerant

Charge for 7.5 meter pipes length

O
U
T
D
O

O

R

U
N

I

T

16mmCondensate drain tube I.D
3/8”in.liquid
3/4”in.suction

25mheight differenceConnection between units
50mtubing length

T
U
B
E

S

LCD Remote ControlOperation control type

2x1500 WHeating elements

8”,10”,12” Ducts

Crankcase heater 60W,3PH Protector Others

A
C

C.

* Noise pressure tested at 1m distance from unit
** Noise power for ducted units measured at air outlet side

Grams

3900

3-1

RATING CONDITIONS

Revision Y05-01Service Manual - DNC Series

3. RATING CONDITIONS

NOTES:

1. Rating conditions ISO/CD 13253R
Cooling: indoor: 27°C (80°F) DB 19°C (66°F) WB
Outdoor: 35°C (95°F) DB

Heating: indoor: 20° C (68°F) DB
Outdoor: 7°C (45°F) DB 6° C (43°F) WB

Refrigerant tubing length (one way) 7.5m (24.6 ft)

2. Guaranteed operating range:

Indoor Outdoor

Upper limit

32°C DB, 23°C WB 46°C DB

Cooling

Lower limit

21°C DB, 15°C WB 21°C DB

Upper limit

27°C DB 24°C DB, 18°C WB

Heating

Lower limit

20°C DB -9°C DB, -10°C WB

1 PH 198 – 242 V

Voltage

3 PH 360 – 440 V

4-1

OUTLINE DIMENSIONS

Revision Y05-01Service Manual - DNC Series

4. OUTLINE DIMENSIONS

4.1 Indoor Unit: DNC 35 (955)

4.2

Indoor Unit: DNC 38 (1155), DNC 44 (1255)

4-2

OUTLINE DIMENSIONS

Revision Y05-01 Service Manual - DNC Series

4.3 Outdoor Unit: OU8-33

4.4

Outdoor Unit: OU10-38, OU10-44, OU10-50

5-1

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - DNC Series

DNC 955 - R22 COOLING CAPACITY

7,000

8,000

9,000

10,000

11,000

12,000

13,000

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

CAPACITY [W)

30 C DB/ 50% RH

27 C DB/ 50% RH

23 C DB/50%RH

Indoor Temp.

DNC 955T - R22 HEATING CAPACITY

6,000

7,000

8,000

9,000

10,000

11,000

12,000

-10 -5 0 5 10 15

Outdoor Temp. (C DB)

CAPACITY [W)

20 C DB

18 C DB

15 C DB

5. PERFORMANCE DATA & PRESSURE CURVES

5-2

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - DNC Series

DNC 955 - R22 COOLING TOTAL INPUT

1,500

2,000

2,500

3,000

3,500

4,000

4,500

10 15 20 25 30 35 40 45

Outdoor Tem p. (C DB)

TOTAL INPUT (W)

30 C DB/ 50% RH

27 C DB/ 50% RH

23 C W B/ 50%RH

Indoor Temp.

DNC 955T - R22 HEATING TOTAL INPUT

1,500

1,700

1,900

2,100

2,300

2,500

2,700

2,900

3,100

3,300

3,500

-10 -5 0 5 10 15

Outdoor Temp. (C DB)

TOTAL INPUT (W

)

20 C DB

18 C DB

15 C DB

5-3

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - DNC Series

DNC 955 - R22 COOLING SUCTION PRESSURE

3.0

3.5

4.0

4.5

5.0

5.5

6.0

6.5

10 15 20 25 30 35 40 45

Outd oor Te m p. (C DB)

SUCTION PRESSURE [Bar(g)]

30 C DB/ 50%R H

27 C DB/ 50%R H

23 C DB/ 50%R H

Indoor Temp.

DNC 955 - R22 COOLING DISCHARGE PRESSURE

5.0

10.0

15.0

20.0

25.0

30.0

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

DISCHARGE PRESSURE [Bar(g)]

30 C DB/50% RH

27 C DB/50% RH

23 C DB/50% RH

Indoor Temp.

5-4

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - DNC Series

DNC 955 - R22 HEATING SUCTION PRESSURE

2.00

2.50

3.00

3.50

4.00

4.50

5.00

-5 0 5 10 15

Outdoor Tem p. (C DB)

SUCTION PRESSURE [Bar(g)]

20 C DB

18 C DB

15 C DB

Indoor Temp.

DNC 955 - R22 HEATING DISCHARGE PRESSURE

10

11

12

13

14

15

16

17

18

19

20

-5 0 5 10 1 5

Outdoor Temp. (C DB)

DISCHARGE PRESSURE [Bar(g)]

20 C DB

18 C DB

15 C DB

Indoor Temp.

5-5

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - DNC Series

DNC 955T - R22 COOLING CAPACITY

7,000

8,000

9,000

10,000

11,000

12,000

13,000

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

CAPACITY [W)

30 C DB/ 50% RH

27 C DB/ 50% RH

23 C DB/50%RH

Indoor Temp.

DNC 955T - R22 HEATING CAPACITY

6,000

7,000

8,000

9,000

10,000

11,000

12,000

-10 -5 0 5 10 15

Outdoor Temp. (C DB)

CAPACITY [W)

20 C DB

18 C DB

15 C DB

5-6

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - DNC Series

DNC 955T - R22 COOLING TOTAL INPUT

1,500

2,000

2,500

3,000

3,500

4,000

4,500

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

TOTAL INPUT (W)

30 C DB/ 50% RH

27 C DB/ 50% RH

23 C W B/ 50%RH

Indoor Temp.

DNC 955T - R22 HEATING TOTAL INPUT

1,500

1,700

1,900

2,100

2,300

2,500

2,700

2,900

3,100

3,300

3,500

-10 -5 0 5 10 15

Outdoor Temp. (C DB)

TOTAL INPUT (W

)

20 C DB

18 C DB

15 C DB

5-7

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - DNC Series

DNC 955T - R22 COOLING SUCTION PRESSURE

3.0

3.5

4.0

4.5

5.0

5.5

6.0

6.5

10 15 20 25 30 35 40 45

Outdoor Temp . (C DB)

SUCTION PRESSURE [Bar(g)]

30 C DB/ 50%R H

27 C DB/ 50% RH

23 C DB/ 50%R H

Indoor Temp.

DNC 955T - R22 COOLING DISCHARGE PRESSURE

5.0

10.0

15.0

20.0

25.0

30.0

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

DISCHARGE PRESSURE [Bar(g)]

30 C DB/50% RH

27 C DB/50% RH

23 C DB/50% RH

Indoor Temp.

5-8

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - DNC Series

DNC 955T - R22 HEATING SUCTION PRESSURE

2.00

2.50

3.00

3.50

4.00

4.50

5.00

-5 0 5 1 0 15

Outdoor Tem p. (C DB)

SUCTION PRESSURE [Bar(g)]

20 C DB

18 C DB

15 C DB

Indoor Temp.

DNC 955T - R22 HEATING DISCHARGE PRESSURE

10

11

12

13

14

15

16

17

18

19

20

-5 0 5 10 15

Outdoor Temp. (C DB)

DISCHARGE PRESSURE [Bar(g)]

20 C DB

18 C DB

15 C DB

Indoor Temp.

5-9

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - DNC Series

DNC 955 - R407C COOLING CAPACITY

7,000

8,000

9,000

10,000

11,000

12,000

13,000

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

CAPACITY [W)

30 C DB/ 50% RH

27 C DB/ 50% RH

23 C DB/50%RH

Indoor Temp.

DNC 955 - R407C HEATING CAPACITY

5,500

6,500

7,500

8,500

9,500

10,500

11,500

12,500

-10 -5 0 5 10 15

Outdoor Temp. (C DB)

CAPACITY [W)

20 C DB

18 C DB

15 C DB

5-10

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - DNC Series

DNC 955 - R407C COOLING TOTAL INPUT

1,500

2,000

2,500

3,000

3,500

4,000

4,500

10 15 20 25 30 35 40 45

Outdoor Tem p. (C DB)

TOTAL INPUT (W)

30 C DB/ 50%RH

27 C DB/ 50%RH

23 C W B/5 0%RH

Indoor Temp.

DNC 955 - R407C HEATING TOTAL INPUT

1,500

2,000

2,500

3,000

3,500

4,000

4,500

-10 -5 0 5 10 15

Outdoor Temp. (C DB)

TOTAL INPUT (W

)

20 C DB

18 C DB

15 C DB

5-11

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - DNC Series

DNC 955 - R407C COOLING SUCTION PRESSURE

3.0

3.5

4.0

4.5

5.0

5.5

6.0

6.5

10 15 20 25 30 35 40 45

Outd oor T e mp . (C D B)

SUCTION PRESSURE [Bar(g)]

30 C DB/ 50%R H

27 C DB/ 50%R H

23 C DB/50%RH

Indoor Temp.

DNC 955 - R407C COOLING DISCHARGE PRESSURE

5.0

10.0

15.0

20.0

25.0

30.0

35.0

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

DISCHARGE PRE SS URE [Bar(g)]

30 C DB/50% RH

27 C DB/50% RH

23 C DB/50% RH

Indoor Temp.

5-12

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - DNC Series

DNC 955 - R407C HEATING SUCTION PRESSURE

1.00

1.50

2.00

2.50

3.00

3.50

4.00

4.50

5.00

5.50

6.00

-5 0 5 10 15

Outdoor Tem p. (C DB)

SUCTION PRESSURE [Bar(g)]

20 C DB

18 C DB

15 C DB

Indoor Temp.

DNC 955 - R407C HEATING DISCHARGE PRESSURE

12

13

14

15

16

17

18

19

20

21

22

-5 0 5 10 15

Outdoor Temp. (C DB)

DISCHARGE PRESSURE [Bar(g)]

20 C DB

18 C DB

15 C DB

Indoor Temp.

5-13

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - DNC Series

DNC 955T - R407C COOLING CAPACITY

7,000

8,000

9,000

10,000

11,000

12,000

13,000

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

CAPACITY [W)

30 C DB/ 50% RH

27 C DB/ 50% RH

23 C DB/50%RH

Indoor Temp.

DNC 955T - R407C HEATI NG CAP ACITY

5,500

6,500

7,500

8,500

9,500

10,500

-10 -5 0 5 10 15

Outdoor Te m p. (C DB)

CAPACITY [W)

20 C DB

18 C DB

15 C DB

5-14

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - DNC Series

DNC 955T - R407C COOLING TOTAL INPUT

1,500

2,000

2,500

3,000

3,500

4,000

4,500

10 15 20 25 30 35 40 45

Outdo or T em p. (C DB)

TOTAL INPUT (W)

30 C DB/ 50% RH

27 C DB/ 50% RH

23 C W B/5 0%RH

Indoor Temp.

DNC 955T - R407C HEATING TOTAL I NPUT

1,500

2,000

2,500

3,000

3,500

4,000

4,500

-10 -5 0 5 10 15

Outdoor Temp. (C DB)

TOTAL INPUT (W

)

20 C DB

18 C DB

15 C DB

5-15

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - DNC Series

DNC 955T - R407C COOLING SUCTION PRESSURE

3.0

3.5

4.0

4.5

5.0

5.5

6.0

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

SUCTION PRESSURE [Bar(g)]

30 C DB/ 50%R H

27 C DB/ 50%R H

23 C DB/ 50%R H

Indoor Temp.

DNC 955T - R407C COOLING DISCHARGE PRESSURE

5.0

10.0

15.0

20.0

25.0

30.0

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

DISCHARGE PRESSURE [Bar(g)]

30 C DB/50% RH

27 C DB/50% RH

23 C DB/50% RH

Indoor Temp.

5-16

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - DNC Series

DNC 955T - R407C HEATING SUCTION PRESSURE

1.00

1.50

2.00

2.50

3.00

3.50

4.00

4.50

5.00

5.50

6.00

-5 0 5 10 15

Outdoor Tem p. (C DB)

SUCTION PRESSURE [Bar(g)]

20 C DB

18 C DB

15 C DB

Indoor Temp.

DNC 955T - R407C HEATING DISCHARGE PRESSURE

12

13

14

15

16

17

18

19

20

21

22

-5 0 5 10 15

Outdoor Temp. (C DB)

DISCHARGE PRESSURE [Bar(g)]

20 C DB

18 C DB

15 C DB

Indoor Temp.

5-17

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - DNC Series

DNC-1155-R22 COOLING CAPACITY

8,000

9,000

10,000

11,000

12,000

13,000

14,000

15,000

16,000

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

CAPACITY [W)

30 C DB/50%RH

26 C DB/50%RH

23 C DB/50%RH

Indoor Temp.

DNC 1155- R22 HEATING CAPACITY

6,000

7,000

8,000

9,000

10,000

11,000

12,000

13,000

14,000

15,000

-10 -5 0 5 10 15

Outdoor Temp . (C DB)

CAPACITY [W)

20 C DB

18 C DB

15 C DB

5-18

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - DNC Series

DNC-1155-R22 COOLING TOTAL INPUT

1,500

2,000

2,500

3,000

3,500

4,000

4,500

5,000

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

TOTAL INPUT (W)

30 C D B/50 %R

H

26 C DB/50%R

H

23 C D B/50 %R

H

Indoor Temp.

DNC-1155-R22 HEATING TOTAL INPUT

1,500

2,000

2,500

3,000

3,500

4,000

4,500

-10 -5 0 5 10 15

Outdoor Temp. (C DB)

TOTAL INPUT (W

)

20 C DB

18 C DB

15 C DB

Indoor Temp.

5-19

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - DNC Series

DNC-1155-R22 COOLING SUCTION PRESSURE

3.0

3.5

4.0

4.5

5.0

5.5

6.0

10 15 20 25 30 35 40 45

Outdoor Temp . (C DB)

SUCTION PRESSURE [Bar(g)]

30 C DB/50%R

H

26 C DB/50%R

H

23 C DB/50%R

H

Indoor Temp.

DNC-1155-R22 CO OLING DISCHARGE PRESSURE

5.0

10.0

15.0

20.0

25.0

30.0

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

DISCHARGE PRESSURE [Bar(g)]

30 C DB/50%R

H

26 C DB/50%R

H

23 C DB/50%R

H

Indoor Temp.

5-20

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - DNC Series

DNC-1155-R22 HEATING SUCTION PRESSURE

2.0

2.5

3.0

3.5

4.0

4.5

5.0

-5 0 5 10 15

Outdo or T em p. (C DB)

SUCTION PRESSURE [Bar(g)]

20 C DB

18 C DB

15 C DB

Indoor Temp.

DNC-1155-R22 HEATING DISCHARGE PRESSURE

10

11

12

13

14

15

16

17

18

19

20

-5 0 5 10 15

Outdoor Temp. (C DB)

DISCHARGE PRE SSURE [Bar(g)]

20 C DB

18 C DB

15 C DB

Indoor

5-21

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - DNC Series

DNC-1155T R22 COOLING CAPACITY

8,000

9,000

10,000

11,000

12,000

13,000

14,000

15,000

16,000

10 15 20 25 30 35 40 45

Outdoor Temp . (C DB)

CAPACITY [W)

30 C DB/50%RH

26 C DB/50%RH

23 C DB/50%RH

Indoor Temp.

DNC 1155T - R22 HEATING CAPACI TY

6,000

7,000

8,000

9,000

10,000

11,000

12,000

13,000

14,000

15,000

-10 -5 0 5 10 15

Outdoor Temp. (C DB)

CAPACITY [W)

20 C DB

18 C DB

15 C DB

5-22

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - DNC Series

DNC-1155T R22 COOLING TOTAL INPUT

1,500

2,000

2,500

3,000

3,500

4,000

4,500

5,000

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

TOTAL INPUT (W)

30 C D B/50 %R

H

26 C D B/50 %R

H

23 C D B/50 %R

H

Indoor Temp.

DNC-1155T R22 HEATING TOTAL INPUT

1,500

2,000

2,500

3,000

3,500

4,000

4,500

-10 -5 0 5 10 15

Outdoor Temp. (C DB)

TOTAL INPUT (W

)

20 C DB

18 C DB

15 C DB

5-23

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - DNC Series

DNC-1155T R22 COOLING SUCTION PRESSURE

3.0

3.5

4.0

4.5

5.0

5.5

6.0

6.5

10 15 20 25 30 35 40 45

Outd oor T e mp . (C DB)

SUCTION PRESSURE [Bar(g)]

30 C DB/50%R

H

26 C DB/50%R

H

23 C DB/50%R

H

Indoor Temp.

DNC-1155T R22 COO LING DISCHARGE PRESSURE

5.0

10.0

15.0

20.0

25.0

30.0

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

DISCHARGE PRESSURE [Bar(g)]

30 C DB/50%R

H

26 C DB/50%R

H

23 C DB/50%R

H

Indoor Temp.

5-24

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - DNC Series

DNC-1155T R22 HEATING SUCTION PRESSUR E

2.0

2.5

3.0

3.5

4.0

4.5

5.0

-5 0 5 10 15

Outd oor T em p. (C DB)

SUCTION PRESSURE [Bar(g)]

20 C DB

18 C DB

15 C DB

Indoor Temp.

DNC-1155T R22 HEATING DISCHARGE PRESSURE

10

11

12

13

14

15

16

17

18

19

20

-5 0 5 10 15

Outdoor Temp. (C DB)

DISCHARGE PRESSURE [Bar(g)]

20 C DB

18 C DB

15 C DB

Indoor Temp.

5-25

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - DNC Series

DNC 1155- R407C COOLING CAPACITY

8,000

9,000

10,000

11,000

12,000

13,000

14,000

10 15 20 25 30 35 40 45

Outdoor Tem p. (C DB)

CAPACITY [W)

30 C DB/50% RH

27 C DB/50% RH

23 C DB/50% RH

Indoor Temp.

DNC 1155- R40 7C HEATING CAPACITY

6,000

7,000

8,000

9,000

10,000

11,000

12,000

13,000

14,000

15,000

-10 -5 0 5 10 15

Outdoor Temp. (C DB)

CAPACITY [W)

20 C DB

18 C DB

15 C DB

5-26

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - DNC Series

DNC 1155 - R407C COO LING TOTAL INPUT

1,500

2,000

2,500

3,000

3,500

4,000

4,500

5,000

10 15 20 25 30 35 40 45

Outdoor Tem p. (C DB)

TOTAL INPUT (W)

30 C DB/ 50% RH

27 C DB/ 50% RH

23 C W B/5 0%RH

Indoor Temp.

DNC 1155 - R407C HEATING TOTAL INPUT

2,000

2,500

3,000

3,500

4,000

4,500

-10 -5 0 5 10 15

Outdoor Temp. (C DB)

TOTAL INPUT (W

)

20 C DB

18 C DB

15 C DB

5-27

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - DNC Series

DNC 1155 - R407C COOLING SUCTION PRESSURE

3.0

3.5

4.0

4.5

5.0

5.5

10 15 20 25 30 35 40 4 5

Outd oor T e mp . (C DB)

SUCTION PRESSURE [Bar(g)]

30 C DB/ 50%R H

27 C DB/ 50%R H

23 C DB/ 50%R H

Indoor Temp.

DNC 1155- R407C COOLING DISCHARGE PRESSURE

5.0

10.0

15.0

20.0

25.0

30.0

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

DISCHARGE PRE SS URE [Bar(g)]

30 C DB/50% RH

27 C DB/50% RH

23 C DB/50% RH

Indoor Temp.

5-28

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - DNC Series

DNC 1155 - R407C HEATING SUCTION PRESSURE

1.00

1.50

2.00

2.50

3.00

3.50

4.00

4.50

5.00

5.50

6.00

-5 0 5 10 15

Outdo or T em p. (C DB)

SUCTION PRESSURE [Bar(g)]

20 C DB

18 C DB

15 C DB

Indoor Temp.

DNC 1155 - R407C HEATING DISCHARGE PRESSURE

13

14

15

16

17

18

19

20

21

22

-5 0 5 10 15

Outdoor Temp. (C DB)

DISCHARGE PRESSURE [Bar(g)]

20 C DB

18 C DB

15 C DB

Indoor Temp.

5-29

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - DNC Series

DNC 1155T - R407C COOLING CAPACITY

7,000

8,000

9,000

10,000

11,000

12,000

13,000

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

CAPACITY [W)

30 C DB/ 50% RH

27 C DB/ 50% RH

23 C DB/50%RH

Indoor Temp.

DNC 1155T - R407C HEATI NG CAP ACITY

6,000

7,000

8,000

9,000

10,000

11,000

12,000

13,000

14,000

15,000

-10 -5 0 5 10 15

Outdoor Temp. (C DB)

CAPACITY [W)

20 C DB

18 C DB

15 C DB

Indoor Temp.

5-30

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - DNC Series

DNC 1155T - R407C COOLING TOTAL INPUT

1,500

2,000

2,500

3,000

3,500

4,000

4,500

5,000

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

TOTAL INPUT (W)

30 C DB/ 50% RH

27 C DB/ 50% RH

23 C W B/5 0%RH

Indoor Temp.

DNC 1155T - R407C HEATING TOTAL I NPUT

2,000

2,500

3,000

3,500

4,000

4,500

-10 -5 0 5 10 15

Outdoor Temp. (C DB)

TOTAL INPUT (W

)

20 C DB

18 C DB

15 C DB

5-31

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - DNC Series

DNC 1155T - R407C COOLING SUCTION PRESSURE

3.0

3.5

4.0

4.5

5.0

5.5

6.0

10 15 20 25 30 35 40 45

Outd oor T e mp . (C DB)

SUCTION PRESSURE [Bar(g)]

30 C DB/ 50%RH

27 C DB/ 50%R H

23 C DB/ 50%RH

Indoor Temp.

DNC 1155T - R407C COOLING DISCHARGE PRESSURE

5.0

10.0

15.0

20.0

25.0

30.0

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

DISCHARGE PRESSURE [Bar(g)]

30 C DB/50% RH

27 C DB/50% RH

23 C DB/50% RH

Indoor Temp.

5-32

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - DNC Series

DNC 1155T - R407C HEATING SUCTION PRESSURE

1.00

1.50

2.00

2.50

3.00

3.50

4.00

4.50

5.00

5.50

6.00

-5 0 5 10 15

Outdoor Tem p. (C DB)

SUCTION PRESSURE [Bar(g)]

20 C DB

18 C DB

15 C DB

Indoor Temp.

DNC 1155T - R407C HEATING DISCHARGE PRESSURE

14

15

16

17

18

19

20

21

22

23

24

-5 0 5 10 15

Outdoor Temp. (C DB)

DISCHARGE PRESSURE [Bar(g)]

20 C DB

18 C DB

15 C DB

Indoor Temp.

5-33

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - DNC Series

DNC-1255 COOLING CAPACITY

10,000

11,000

12,000

13,000

14,000

15,000

16,000

17,000

18,000

19,000

20,000

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

CAPACITY [W)

30 C DB/50%RH

26 C DB/50%RH

23 C DB/50%RH

Indoor Temp.

DNC-1255 HEATING CAP ACI TY

8,000

9,000

10,000

11,000

12,000

13,000

14,000

15,000

16,000

17,000

18,000

-10 -5 0 5 10 15

Outdoor Temp. (C DB)

CAPACITY [W)

20 C DB

18 C DB

15 C DB

5-34

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - DNC Series

DNC-1255 COOLING TOTAL INPUT

1,500

2,000

2,500

3,000

3,500

4,000

4,500

5,000

5,500

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

TOTAL INPUT (W)

30 C DB/ 50%RH

26 C DB/ 50%RH

23 C DB/ 50%RH

Indoor Temp.

DNC-1255 HEATING TOTAL I NPUT

1,500

2,000

2,500

3,000

3,500

4,000

4,500

-10 -5 0 5 10 15

Outdoor Temp. (C DB)

TOTAL INPUT (W

)

20 C DB

18 C DB

15 C DB

5-35

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - DNC Series

DNC-1255 COOLING SUCTION PRESSURE

3.0

3.5

4.0

4.5

5.0

5.5

6.0

10 15 20 25 30 35 40 45

Outdoor Temp . (C DB)

SUCTION PRESSURE [Bar(g)]

30 C DB/ 50%RH

26 C DB/ 50%RH

23 C DB/ 50%RH

Indoor Temp.

DNC-1255 COOLING DISCHARGE PRESSURE

5.0

7.0

9.0

11.0

13.0

15.0

17.0

19.0

21.0

23.0

25.0

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

DISCHARGE PRE SSURE [Bar(g)]

30 C DB/50% RH

26 C DB/50% RH

23 C DB/50% RH

Indoor Temp.

5-36

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - DNC Series

DNC-1255 HEATING SUCTION PRESSURE

2.0

2.5

3.0

3.5

4.0

4.5

5.0

-5 0 5 10 15

Outdoor Temp. (C DB)

SUCTION PRESSURE [Bar(g)]

20 C DB

18 C DB

15 C DB

Indoor Temp.

DNC-1255 HEATING DISCHARGE PRESSURE

10

11

12

13

14

15

16

17

18

19

20

-5 0 5 10 15

Outdoor Temp. (C DB)

DISCHARGE PRE SSURE [Bar(g)]

20 C DB

18 C DB

15 C DB

Indoor Temp.

5-37

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - DNC Series

DNC 1255- R407C COOLING CAPACITY

10,000

11,000

12,000

13,000

14,000

15,000

16,000

17,000

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

CAPACITY [W)

30 C DB/50% RH

27 C DB/50% RH

23 C DB/50% RH

Indoor Temp.

DNC 1255- R407C HEATING CAPACITY

6,000

8,000

10,000

12,000

14,000

16,000

18,000

20,000

-10 -5 0 5 10 15

Out d oo r Te mp . (C DB)

CAPACITY [W)

20 C DB

18 C DB

15 C DB

5-38

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - DNC Series

DNC 1255 - R407C COOLING TOTAL INPUT

1,500

2,000

2,500

3,000

3,500

4,000

4,500

5,000

5,500

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

TOTAL INPUT (W)

30 C DB/ 50% RH

27 C DB/ 50% RH

23 C W B/5 0%RH

Indoor Temp.

DNC 1255 - R407C HEATING TOTAL INPUT

3,500

4,000

4,500

5,000

5,500

6,000

-10 -5 0 5 10 15

Outdoor Temp. (C DB)

TOTAL INPUT (W

)

20 C DB

18 C DB

15 C DB

5-39

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - DNC Series

DNC 1255 - R407C COOLING SUCTION PRESSURE

3.0

3.5

4.0

4.5

5.0

5.5

10 15 20 25 30 35 40 45

Outd oor T e mp . (C DB)

SUCTION PRESSURE [Bar(g)]

30 C DB/ 50%R H

27 C DB/ 50%R H

23 C DB/ 50%R H

Indoor Temp.

DNC 1255- R407C COOLING DISCHARGE PRESSURE

5.0

10.0

15.0

20.0

25.0

30.0

10 15 20 25 30 35 40 45

Outdoor Temp. (C DB)

DISCHARGE PRESSURE [Bar(g)]

30 C DB/50% RH

27 C DB/50% RH

23 C DB/50% RH

Indoor Temp.

5-40

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01 Service Manual - DNC Series

DNC 1255 - R407C HEATING SUCTION PRESSURE

1.00

1.50

2.00

2.50

3.00

3.50

4.00

4.50

5.00

5.50

6.00

-5 0 5 10 1 5

Outdoor Tem p. (C DB)

SUCTION PRESSURE [Bar(g)]

20 C DB

18 C DB

15 C DB

Indoor Temp.

DNC 1255 - R407C HEATING DISCHARGE PRESSURE

13

15

17

19

21

23

-5 0 5 10 15

Outdoor Temp. (C DB)

DISCHARGE PRE SS URE [Bar(g)]

20 C DB

18 C DB

15 C DB

Indoor Temp.

5-41

PERFORMANCE DATA & PRESSURE CURVES

Revision Y05-01Service Manual - DNC Series

DNC 1255

0.0

20.0

40.0

60.0

80.0

100.0

120.0

0 250 500 750 1000 1250 1500 1750 2000 2250 2500 2750

Air Flow Rate, m^3/hr

External Static Pressure,Pa

Super High

Hig h

Medium

Low

Nominal System
Re si st an c e

M in .S y ste m R e si sta n c e

M ax . S yst em Re sist a nc e

Curve’s colors
according to fan
motor wires colors

Point for Performance test

DNC 1155 & DNC 955

0.00

20.00

40.00

60.00

80.00

100.00

120.00

0 250 500 750 1000 1250 1500 1750 2000 2250 2500

Air Flow Rate, m ^3/hr

External S tatic Pressure,Pa

Super High

High

Medium

Low

No m i na l S yst em Re si st a n ce

Min.System Resistance

M ax . S y st e m Re sist an c e

Curve’s colors
according to fan
moto r wires color s

Point for Performance test

6-1

REFRIGERATION DIAGRAMS

Revision Y05-01Service Manual - DNC Series

6. REFRIGERATION DIAGRAMS

6.1 Heat Pump Models

6.1.1 DNC 35 R22/R407C

6-2

REFRIGERATION DIAGRAMS

Revision Y05-01 Service Manual - DNC Series

6.2 Heat Pump Models

6.2.1 DNC 38, 44 R22/R407C

6-3

REFRIGERATION DIAGRAMS

Revision Y05-01Service Manual - DNC Series

6.3.1 ADDITIONAL REFRIGERANT CHARGE (R22)

7-1

WIRING DIAGRAMS

Revision Y05-01Service Manual - DNC Series

7. WIRING DIAGRAMS

7.1 Model: DNC 35 1PH

7.1.1 Indoor Unit

7.1.2 Outdoor Unit

7-2

WIRING DIAGRAMS

Revision Y05-01 Service Manual - DNC Series

7.2 Model: DNC 35 3PH7

7.2.1 Indoor Unit

7.2.2 Outdoor Unit

7-3

WIRING DIAGRAMS

Revision Y05-01Service Manual - DNC Series

7.3 Model: DNC 38 1PH

7.3.1 Indoor Unit

7.3.2 Outdoor Unit:

7-4

WIRING DIAGRAMS

Revision Y05-01 Service Manual - DNC Series

7.4 Model: DNC 38 3PH

7.4.1 Indoor Unit

7.4.2 Outdoor Unit: OU8-30 3PH

7-5

WIRING DIAGRAMS

Revision Y05-01Service Manual - DNC Series

7.5 Model: DNC 44 3PH

7.5.1 Indoor Unit

7.5.2 Outdoor Unit

8-1

CONTROL SYSTEM

Revision Y05-01Service Manual - DNC Series

8. CONTROL SYSTEM

Instructions for

Electronic Control Service Package

INTRODUCTON

The electronic control package is designated for service and is common for the following
group of air-conditioners.

1. ST/RC group - Cooling only / Cooling and Heating by heat pump.

Cooling and Heating by heat pump and supplementary heater.2. SH group -

3. RH group - Cooling and Heating by heaters only.

Before installation , be sure that you select and set for the right group .

PACKAGE CONTENT

The following should be included in the electronic control service package:

- Controller designated for service

- Model plug

MODEL PLUG SETTINGS

Before installation, make sure to set the model plug to conform with the suitable group.

GROUP J6 Setting J2 Setting

ST / RC open open

SH closed open

RH closed closed

8-2

CONTROL SYSTEM

Revision Y05-01

Service Manual - DNC Series

POWER CONTROLLER

8-3

CONTROL SYSTEM

Revision Y05-01Service Manual - DNC Series

GANG BOARD

DISPLAY BOARD

8-4

CONTROL SYSTEM

Revision Y05-01

Service Manual - DNC Series

CONFIGURATION OF THE APPLIANCE

REMOTE CONTROL DIP SWITCH SETTING

DEFINITIONSETTING SWITCH STATUS

RC4RC3SW. NO.4SW. NO. 3SW. NO. 2SW. NO. 1

RC-ALL MODES OF OPERATION__

OFF

OFF

STD-COOL, FAN, DRY, ACTIVE__

OFF

ON

HEAT-COOL, FAN, DRY, ACTIVE__

ON

OFF

AUTO FAN (AF)__

ON

ON

VERTICAL SWING ONLY

TEMP. DISPLAY IN °C DEGREES

_OFF

_

_

HORIZONTAL & VERTICAL SWING

FUNCTIONS TOGETHER

TEMP. DISPLAY IN °F DEGREES

_ON

_

_

DISABLE LCD &

KEY ILLUMINATION

TIMER & CLOCK 12 H AM, PM

OFF_

_

_

ENABLE LCD &

KEY ILLUMINATION

TIMER & CLOCK 24 H

ON

_

_

_

RESET OPERATION - Press at the same time the 4 buttons :“CLEAR “, “SET” ,

"HR +”, “HR -” for 5 seconds

LEGEND:

SW1, SW2 - SELECTION OF RC/ST
SW3 - SELECTION OF TEMP. DISPLAY °C or °F IN RC3 OR SWING FUNCTION IN RC4.
SW4 - SELECTION OF TIME DISPLAY 12H AM/PM or 24H IN RC3 0R ILLUMINATION FUNCTION IN RC4.
OFF = 0
ON =1

NOTE: After setting the dip switches perform reset operation..

8-5

CONTROL SYSTEM

Revision Y05-01Service Manual - DNC Series

01. Legend

1.1. Abbreviations

AC - Alternate Current
A/C - Air-Conditioner
ANY - ON or OFF status
CLOCK - ON/OFF Operation Input, (dry contact)
COMP - Compressor
CPU - Central Processing Unit
ELUM - Extended Louver Upward Movement (Software
Jumper)
HE - Heating Element
HPC - High Pressure Control
H/W - Hardware
ICP - Indoor Condensation Pump
ICT - Indoor Coil Temperature (RT2) sensor
IF, IFAN - Indoor Fan
IR - Infra Red
LEVEL1 - Normal Water Level
LEVEL2/3 - Medium/High Water Level
LEVEL4 - Overflow Level
Max - Maximum
Min - Minimum
min - Minute (time)
NA - Not Applicable
OCP - Outdoor Condensation Pump
OCT - Outdoor Coil Temperature (RT3) sensor
OF, OFAN - Outdoor Fan
OPER - Operate
Para. - Paragraph
RAT - Return Air Temperature (RT1) sensor
RC - Reverse Cycle (Heat Pump)
R/C - Remote Control
RCT - Remote Control Temperature
RH - Resistance Heater
RT - Room Temperature (i.e. RCT in IFEEL mode, RAT
otherwise)
RV - Reversing Valve
SB, STBY - Stand-By
sec - Second (time)
Sect - Section
SH - Supplementary Heater
SPT - Set Point Temperature
ST - Standard (a Model with Cooling Only)
S/W - Software
TEMP - Temperature
W/O - Without
∆T - The difference between SPT and RT.

in Heat Mode: ∆T =
SPT-RT
Cool/Dry/Fan Mode: ∆T =
RT-SPT

8-6

CONTROL SYSTEM

Revision Y05-01

Service Manual - DNC Series

2. General functions for all models

2.1. COMP operation

2.1.1. For each Mode including POWER OFF & SB, a Min time delay of 3 min
before COMP restarting, excluding DEICING Mode (see 7.2.1).

2.1.2. The Min operation time of COMP under different operating conditions is

Operation Mode

Min operation time of

COMP

Heat, Cool or Auto Modes 3 min.

Fan, Dry, Overflow, Protection modes, or mode change ignored

2.2. IFAN operation

2.2.1 Whenever the IFAN starts from OFF to ON it will start in Low speed
for 25 sec and then will go to ANY speed.

2.2.2 Min time interval between IFAN speed change in AUTOFAN Mode, is
30 sec.

2.2.3 Min time interval between IFAN speed change in H/M/L Mode is 1 sec.

2.2.4 IFAN speed in Heat/Cool Autofan Mode is determined according to
the following table:

∆T

IFAN Speed

∆T ≥ 2

HIGH

2 ≥∆T ≥ 1

MED

1 ≥∆T

LOW

where in Heat Mode: ∆T = SPT-RT
in Cool Mode: ∆T = RT-SPT

Note:

1. In Heat Mode, the rules in section 4.0.3 have the higher

priority.

2. The table above can be represent by a hysteresis curve which

will minimize the switching of the IFAN relay and will minimize
the change in IFAN speed:

T [oc]

L

M

H

IFAN speed

321

2.4. OFAN operation

2.4.1 Min time interval between OFAN ON/OFF state change is 30 sec.

8-7

CONTROL SYSTEM

Revision Y05-01Service Manual - DNC Series

2.4.2

2.5. HE operation

2.5.1 Minimum Heaters ON or OFF time is 30 sec.

2.5.2 Heaters can be activated only if IFAN is on.

2.5.3 In RH group, HE-1 and HE-2 will be activated only when COMP (or
WVL) is not operating, except in Dry Mode.

2.6. Protections

2.6.1 High pressure protection is applicable to all operating modes.

2.6.2 Deicing control is valid in Heat and Auto Heat Mode only.

2.6.3 Defrosting control is valid in Dry, Cool, Heat and Auto Modes.

2.6.4 No reset after protection modes.

2.7. Thermistors operation

2.7.1 Return air Temp. is detected by RAT (RT1) in normal Mode, or by
RCT (R/C sensor) in I-FEEL Mode.

2.7.2 Indoor Coil Temp. is detected by ICT (RT2).

2.7.3 Outdoor Coil Temp. is detected by OCT (RT3).

Similarly, in the Indoor Units of a WMQ/T system, 4.7k Ohm (5%)

resistors must be connected to the OCT ports to disable the
“Thermistor Temp reading doesn’t change” error checking.

2.7.4 Definition of thermistor faults:

a. Thermistor is disconnected ­ The thermistor reading is below -30

o

c.

b. Thermistor is shorted ­ The thermistor reading is over 75

o

c.

c. Thermistor Temp reading doesn’t change (irrelevant for RT1)

­(i) This test is performed only once after a unit is

switched from OFF/STBY to operation. At the first
occurrence of 10 min continuous COMP operation,
the current ICT & OCT are compared with those
when the COMP was switched from OFF to ON 10
min before. If the ∆T is less than 3

o

c, the thermistor

is regarded as defective.

(ii) The ICT and OCT no-change error can be disabled

together by connecting a 4.7 k or 3.9 k ohm resistor
(5%) to the OCT connector. These resistors are
equivalent to a thermistor at 43+/-1

o

c and 48+/-1oc

respectively.

2.7.5 Cases for disabling thermistor short/disconnected detection

i. The detection of thermistor faults (a) and (b) above, are disabled

when Deicer Protection is started. The detection will be enabled
again only after (1) the deicing is completed, and (2) COMP has
been restarted and operated for 30 sec.

ii. When all the following conditions are fulfilled:

a. 4.7K Ohm resistor is connected on the OCT
b. IFAN is OFF
c. Compressor is ON

8-8

CONTROL SYSTEM

Revision Y05-01

Service Manual - DNC Series

d. ICT < -30 (disconnected)

2.8.General features

2.8.1 Allowed (control target) range for RAT is SPT +/- 1

o

c.

2.8.2 Whenever the unit is changed from Cool/Dry/STBY mode to Heat
mode or vice versa, the procedures below are followed:

Stop COMP for 3 min → Change RV state → Start COMP if

necessary.

3.1. Cooling

Mode: Cool, Auto (at Cooling)
Temp: Selected desired temperature.
Fan: HIGH, MED, LOW
Timer: Any
I Feel: On or Off

Control function

Maintains room temp at desired level by comparing RT and SPT.

8-9

CONTROL SYSTEM

Revision Y05-01Service Manual - DNC Series

(RT - SPT) [oc]

+3

+2

+1

0

-1

-2

ON

OFF

ON

OFF

USER FAN SPEED

ON

OFF

COMP
(WVL)

OFAN

IFAN

RV

Note:

1) IFAN is always running at High, Medium or Low speed
selected by user.

2) In IFEEL mode, the Room Temperature (RT) is the RCT from
a R/C. Otherwise, the RT is the RAT from the Room
Thermistor.

3.2. Cooling with Autofan

Mode: Cool, Auto (at cooling)
Temp: Selected desired temperature
Fan: Auto
Timer: Any
I Feel: On or Off

Control function

Maintains room temp at desired level and controls the IFAN speed for
optimal comfort.

8-10

CONTROL SYSTEM

Revision Y05-01

Service Manual - DNC Series

(RT - SPT) [oc]

+3

+2

+1

0

-1

-2

ON

OFF

ON

OFF

H

L

M

ON

OFF

COMP

(WVL)

OFAN

IFAN

RV

Note: Refer to Sect 2.3 for IFAN operations in Autofan mode.

8-11

CONTROL SYSTEM

Revision Y05-01Service Manual - DNC Series

4. Heating Mode

4.0. Heating Mode - General

4.0.1 In heating Mode, temp. compensation schedule will be activated for
wall mounted and ducted models (i.e. FCD/RWK, ELD, ECC, WAX,
WMF and WMN/WHX) according to the following table:

Add to SPT SPT [

o

c]

I-FEEL ON I-FEEL OFF

18 ≤ SPT ≤ 27

0 °c +2 °c

27 < SPT ≤ 30

0 °c +3 °c

4.0.3 IF operating rules
(a) As a general rule for RC and SH groups, when COMP is ON,

excluding protection modes, IFAN will be switched ON if

• ICT > 35

o

c (or 40oc for EMD/ELD, 20oc for WAX), or

• at the IFTC second

(4)

after the COMP is switched ON.

In this case, the IFAN will be started at low speed

(5)

.

The default IFTC values are

0 sec for EMD/ELD models
15 sec for
WMN4/RWK(FCX) models
600 sec for WVL (including
IFC) models
30 sec for all other models

IFAN Speed

Any

Low

Stop

30 35 40

EMD/ELD

EMD/ELD

ICT [oc]

15 20 25

General :
For WAX :

Notes :

1) In EMD/ELD models, the IFAN will start if ICT ≥ 40

o

c at

any IFAN speed, and will stop if ICT < 30

o

c.

2) In SH or RC group, if HE is set to OFF due to low ICT,

IFAN will be switched to LOW and will be turned OFF
after 30 sec.

3) An exception to this rule (4.0.3.a) is the Back-up mode
for SH group. (Cf.: Sect 4.0.4.e)

4) If the IFAN is turned ON by the IFTC operation, its
minimum operation time before stopping due to low ICT
temperature is 60 sec.

8-12

CONTROL SYSTEM

Revision Y05-01

Service Manual - DNC Series

(b) In RC and SH groups, whenever COMP & HE are both OFF,

excluding protection modes, IFAN operation will be according
to the following:

In WAX, flour mounted or mobile models, IFAN switches to

LOW for 30 sec and then stops.

In other models IFAN will operate in low speed for 30 sec and

then stop. If COMP is OFF for more than 3 minutes and IFEEL
Mode is inactive, IFAN will operate in low speed according to
the following graph:

(c) In RH group, IFAN starts when HE starts. When HE switches

to OFF, IFAN switches to LOW for 30 sec and then stops.

4.0.4 HE operation

(a) For all Groups, HE can be ON only when IFAN is ON.
(b) For all Groups, HE switches to OFF when ICT > 50

o

c, and is

activated again when ICT ≤ 45

o

c.

(c) In RH group, HE operation is according to the difference

between RAT and SPT (see Sect 4.3, 4.4).

(d) In SH or RC group, HE operation is limited by the following

graph:

HE

ON

OFF

30

45 50

ICT [oc]

15

General :
For WAX :

35
20

40

Note: Other limitations can be found in Sect 2.5

(f) Back-up mode for SH group

After COMP (or WVL) has been working for 5 minutes, HE &
IFAN are activated even if the ICT is still below 35

o

c. This
situation is called Back-up Mode. Both HE & IFAN will work in
Back-up Mode until the ICT reaches 35

o

c. Then, the operation

goes on in the usual mode (IFAN as in 4.0.3.a, and HE as in

4.0.4.d).

SPT+4 SPT+6 ICT

[

o

c

]

ON

OFF

IFAN (Low Speed)

8-13

CONTROL SYSTEM

Revision Y05-01Service Manual - DNC Series

4.1. Heating, RC or SH Group

Mode: Heat, Auto (at heating)
Temp: Selected desired temperature
Fan: HIGH, MED, LOW
Timer: Any
I Feel: On or Off

Control function
Maintains room temp. at desired level by comparing RAT or RCT to
SPT.

(RT - SPT) [oc]

+2

+1

0

-1

-2

-3

ON

OFF

ON

OFF

H/M/L

OFF

L

ON

OFF

Note 1 Note 2

COMP
(WVL)

HE1

HE2

IFAN

ON

OFF

RV

Note :

1) Refer to Sect 4.0.3.b for IFAN operations when COMP is OFF.

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2) Refer to Sect 4.0.3.a for IFAN operations when COMP is ON.

3) For OFAN operation, see Note 4 of Sect 4.2.

4.2. Heating, RC or SH Group with Autofan

Mode: Heat, Auto (at heating)
Temp: Selected desired temperature
Fan: Auto
Timer: Any
I Feel: On or Off

Control function
Maintains room temp at desired level by controlling COMP, IFAN and
OFAN.

(RT - SPT) [oc]

+2

+1

0

-1

-2

-3

ON

OFF

ON

OFF

H

OFF

L

M

ON

OFF

Note 1 Note 2

COMP

(WVL)

HE1

HE2

IFAN

RV

ON

OFF

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Notes:

1. Refer to Sect 4.0.3.b for IFAN operations when COMP is OFF.

2. Refer to Sect 4.0.3.a for IFAN operations when COMP is ON.

3. Refer to Sect 2.3 for IFAN speed change.

4. OFAN operation is controlled by the graph below when

() (RAT ≥ SPT – 2

o

c), AND

() (ICT ≥ 45

o

c), AND

() (COMP is ON)

Otherwise, OFAN runs together with COMP.

OCT [oc]

+3

+2

+1

0

-1

OFAN

ON

OFF

4.3. Heating, RH Group

Mode: Heat, Auto (at Heating)
Temp: Selected desired temperature
Fan: HIGH, MED, LOW
Timer: Any
I Feel: On or Off

Control Function

Maintains room temp. at desired level by controlling Heating Elements
: HE1 or HE2.

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(RT - SPT) in oc

+2

+1

0

-1

-2

-3

ON

OFF

ON

OFF

H/M/L

OFF

L

30 sec

HE1

HE2

IFAN

Notes:

1) COMP (or WVL), OFAN and RV are always OFF.

2) Refer to Sect 4.0.3.c for IFAN operations.

4.4. Heating, RH Group, with Autofan

Mode: Heat, Auto (at Heating)
Temp: Selected desired temperature
Fan: Auto
Timer: Any
I Feel: On or Off

Control function

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Maintains room temp at desired level by controlling the 2-Stage
Electric Heaters.

(RT - SPT) [oc]

+2

+1

0

-1

-2

-3

ON

OFF

ON

OFF

H

OFF

L

30 sec

M

HE1

HE2

IFAN

Notes:

1) COMP (or WVL), OFAN and RV are always OFF.

2) Refer to Sect 2.3 and 4.0.3.c for IFAN operations.

5. Automatic Cooling or Heating

5.0. Automatic Cooling or Heating - General

The Auto Mode is for model with compressor and the WVL-RH only.
The WVL-ST, RC and SH units do not work in Auto Mode.

5.0.1 Switching-temperature between Cooling and Heating is SPT ±
3

o

c.

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5.0.2 Autofan in Automatic Cooling and Heating Mode will
activate “Cooling with Autofan Mode” and “Heating with
Autofan Mode” respectively.

• For Cooling with Autofan, refer to Sect. 3.2.

• For Heating with Autofan (RC and SH Group),

refer to Sect. 4.2.

• For Heating with Autofan (RH Group), refer to

Sect. 4.4.

5.0.3 When the Auto Mode is started with SPT +/-0

o

c, the
unit will not select Auto Heat or Auto Cool mode
immediately. Instead, the unit will be in a temporary
Fan Mode with IFAN operating at low speed. The
proper Auto Heat mode or Auto Cool will be started
whenever the RT reaches SPT-1

o

c or SPT+1oc

respectively.

5.0.4 For RC & SH units, Mode change between Auto Heat &
Auto Cool Modes are possible only after the COMP has
been OFF during the last T minutes.

Mode Change time, T

Auto Cool to Auto Heat 3 min

Auto Heat to Auto Cool 4 min

5.0.5 For RH units, Mode change between Auto Heat & Auto
Cool Modes are possible after the COMP/HEs has
been OFF during the last T minutes.

Mode Change time, T

Auto Cool to Auto Heat COMP off for 3 min

Auto Heat to Auto Cool HEs off for 3 min

5.0.6 When unit is changed form Cool/Dry mode to Auto
Mode, the unit will continue to operate at (Auto) Cool
Mode until the conditions for switching from Auto Cool
to Auto Heat are satisfied.

Similarly, when unit is changed from Heat Mode to Auto
Mode, the unit will continue to operate at (Auto) Heat
Mode until the conditions for switching from Auto Heat
to Auto Cool are satisfied.

5.1. Auto Cooling or Heating, RC or SH Groups

Mode: Auto
Temp: Selected desired temperature
Fan: Any
Timer: Any
I Feel: On or Off

Control function
Maintains room temp at desired level by selecting between cooling

and heating modes.

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(RT - SPT) [oc]

+3

+2

+1

0

-1

-2

-3

ON

OFF

ON

OFF

H/M/L/OFF

L/OFF

ON

OFF

ON

OFF

COMP

& OFAN

HE1

HE2

IFAN

RV

H/M/L/OFF

L/OFF

USER FAN SPEED H/M/L/OFF

L/OFF

Auto Cool Mode Auto Heat Mode

> 4 min > 3 min

> 3 min > 2 min

(3) (3)

(4)

(4)

(5)

Auto Heat Mode

Notes:

1) Refer to Sect 4.1 and 4.2 for the heating operations (i.e.
when RV is ON)

2) Refer to Sect 3.1 and 3.2 for the cooling operations (i.e.
when RV is OFF)

3) Refer to Sect 5.0.4 for the minimum mode-change delay
from COMP OFF.

4) 3 min delay from COMP-OFF to RV change state. (Cf.: Sect

2.8.8).

5) Because of the low ICT, IFAN is turned OFF while changing
from Auto Cool to Auto Heat mode. (Cf.: Sect 4.0.3). In
addition, HEs will not operate until IFAN is ON (Cf.: Sect

4.0.4).

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Auto Cooling or Heating RH Group

Mode: Auto
Temp: Selected desired temperature
Fan: Any
Timer: Any
I Feel: On or Off

Control function
Maintains room temp at desired level by selecting between Cooling or

Heating Modes.

(RT - SPT) [oc]

+3

+2

+1

0

-1

-2

-3

ON

OFF

ON

OFF

L

OFF

ON

OFF

H/M/L

30 sec

COMP

& OFAN

HE1

HE2

IFAN

RV

OFF

> 3 min

(2)

Auto Heat Mode Auto Cool Mode Auto Heat Mode

(1)

> 3 min

(2)

Notes:

1) Refer to Sect. 4.0.3.c for the details of IFAN operation.

2) Refer to Sect 5.0.5 for the minimum mode-change delay from
COMP/HEs OFF.

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6. Dry Mode

6.1. Dry, ST or RC group or P2000 model with any group settings

Mode: Dry
Temp: Selected desired temp
Fan: Low (automatically selected by software)
Timer: Any
I FEEL: Any

Control function
Reduce room humidity with minimum temp. fluctuations by operating
in Cool Mode with low speed IFAN.

DRY

(RT - SPT) [oc]

+2

+1

0

-1

-2

ON

OFF

ON

OFF

LOW

OFF

DRY-ON

DRY-OFF

ON

OFF

Time [min]

10

20

30

40 50

Max 15 minutes

3.5

min

Note1

6 min

Note 2

COMP

& OFAN

HE1

& HE2

IFAN

RV

Max 15 minutes

5 minutes COMP

ON time

Notes :

1. When Dry is ON, the COMP is forced OFF for 3.5 min (longer
than the 3 min Min COMP-Off time) after every 15 min of
continuous COMP operation.

2. When Dry is OFF, the COMP is forced ON for 6 min (longer
than the 3 min Min COMP-On time) after every 15 min of
continuous COMP OFF time.

3. When Dry is changed from ON to OFF or vice versa, the limits
mentioned in (1) & (2) are ignored. The COMP operation is

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only controlled by the 3 min Min OFF time and 1 min Min ON
time.

4. In Dry Mode, IFAN is LOW when COMP is ON, and is OFF
when COMP is OFF.

5. Pumps are operating as indicated in Sect. 7.3, 7.4, and 7.5.

6. HEs are always OFF in Dry Mode.

6.2. Dry, SH or RH group excluding P2000 model

Mode: Dry
Temp: Selected desired temp.
Fan: Low (automatically selected by software)
Timer: Any
I FEEL: Any

Control function
Reduce room humidity with minimum Temp. fluctuations by operating
in Cool Mode with low speed IFAN and HE.

(RT - SPT) [oc]

+2

+1

0

-1

-2

ON

OFF

ON

OFF

LOW

OFF

ON

OFF

10

20

30

40 50

COMP

& OFAN

HE1

IFAN

HE2

ON

OFF

RV

Time [min]

Notes :

1) HP and Defrost protections are the same as in Cool Mode.

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2) HEs are operated according to the room temp., in the same
way as in Heating for RH group (Sect 4.3).

3) IFAN is operating continuously at low speed.

4) Pumps operation is described in Sect 7.3 and 7.4.

4) For MBX model, HE1 and HE2 will be activated simultaneously
as the HE1 above.

7. Protection

7.1. Cooling Mode Protections

7.1.1. Indoor Coil Defrost

Mode: Cooling, Dry, Auto
Temp: Selected desired temp.
Fan: Any
Timer: Any
I Feel: On or Off

Control Function
Protect the indoor coil from ice formation at low ambient temperature.

ICT [oc]

+2

ON

OFF

ON

OFF

t1 t2 t3

COMP

OFAN

+1

+5

+14

0

-1

-6

ON

OFF

IFAN

J7 OPEN J7 CLOSED

t1 t1

t1 = 5 min minimum for each COMP starting
t2 = OFAN cycling (alternate between ON and OFF every 30 sec)
for 20 min maximum
t3 = COMP and OFAN stop for 10 min minimum

Notes:

1. When J7 is closed (connected), OFAN cycling is cancelled and the
set temperature for COMP & OFAN cut-out and cut-in are

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changed. COMP & OFAN are forced OFF when ICT =< -6

o

c, and

are kept OFF until ICT > 14

o

c.

2. For WAX model, the defrost processes is simpler. When J7 is
open, COMP & OFAN are forced OFF when ICT =< -1

o

c, and are

kept OFF until ICT > 5

o

c. When J7 is closed, the WAX defrosting
process is the same as that of the other models (R.H.S. of the
graph above). In both cases, the ICT checking in t2 and t3 are not
applied.

7.1.2. High Pressure Protection

Mode: (Auto) Cooling or Dry
Temp: Selected desired temp.
Fan: Any
Timer: Any
I Feel: On or Off

Control Function
To protect the COMP from the high pressure built-up in the outdoor

coil during normal cooling operation, by switching OFF the IFAN and
COMP.

OCT [oc]

Any

OFF

Any

ON

Any

Blink

ON

COMP

OFAN

IFAN

OPER

LED

52

55

61

66

L

COMP is forced OFF

OFAN is forced ON

IFAN forced

to LOW

68

OFAN follow operation of

COMP

COMP is forced OFF

OFAN is forced ON

For all models except WAX & P2000 For WAX & P2000 models

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1. The ICT is also monitored during Cool and Dry mode, in case
the RV control circuit is faulty. Whenever ICT reaches 70

o

c,
which indicates a high pressure in the indoor coil, the COMP
will be forced off automatically. The COMP can be turned on
again only after the ICT is under 70

o

c again and after the 3 min
COMP ON delay time. The OPER LED will not blink in this
case.

7.2. Heating Mode Protections

7.2.1. Outdoor coil Deicing (excluding RH Group)

Mode: Heating, Auto (at heating)
Temp: Selected desired Temp
Fan: Any
Timer: Any
I FEEL: Any

Control function

Protects the Outdoor coil from ice formation by controlling COMP &
RV operation.

7.2.1.2 Deicing procedure

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OCT [oc]

ON

OFF

ON

OFF

ON

L

ANY

COMP

OFAN

RV

IFAN

DST

(DDT)

0

12

OFF

HEs are forced ON

DOC

ANY

ON

HE

36s 36s

DT

30s

max 12 min.

Note 3

DI (note 1)

DI (note 2)

30s

3 min 3 min

IFAN

OFF

ANY

HE

OFF

ANY

all SH units

except WAX

RC or WAX units

HEs are forced OFF

IFAN is forced to Low Speed

BLINK

ON

OPER

LED

Notes :

1. At the first COMP activation after SB or OFF, if (OCT < 0

o

c),

then DI = 10 min, else DI = 40 min.

2. In the following Deicing cycles, the time interval between two
Deicing cycles activation is between 30 to 80 min (refer to the
flow chart).

2. For RC group, HEs are forced OFF. IFAN operation is as in
Heat Mode, Sect 4.0.3.a, i.e. IFAN will be set to OFF when
ICT<30

o

c.

For WAX, the IFAN is simply forced OFF.

4. For SH group, HEs are forced ON and IFAN is forced to
operate in Low speed, regardless of the ICT and difference
between RAT & SPT.

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7.2.2. High pressure protection (excluding RH Group)

Mode: (Auto) Heating
Fan: Any
Timer: Any
I Feel: On or Off

Control Function
Protect the Compressor from high pressure by switching OFF the

OFAN and COMP.

ICT [oc]

Any

Off

Any

Off

COMP

OFAN

52

55

61

66

COMP is forced OFF

67

OFAN is force

Off

COMP is forced OFF

For all models except WAX For WAX model

ON

BLINK

OPER

LED

Notes:

1. IFAN, HE1 and HE2 will be activated according to the relevant
Heating Mode Sect.

2. In case of any malfunction in the relay control circuit, the OCT
is also monitored during Heating mode. Whenever OCT
reaches 70

o

c, which indicates a high pressure in the outdoor
coil, the COMP will be forced off automatically. The COMP
can be turned on again only after the 3 min COMP ON delay
and the OCT is under 70

o

c. The OPER LED will not blink in

this case.

7.5. Condensation Pump (DNC model only)

Mode: Cool, Dry, Auto
Temp: Selected desired temperature
Fan: Any

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Timer: Any
I FEEL: Any

Control function:
Prevent Condensed water from Overflowing.

ON

OFF

ON

COMP

(WVL)

PUMP

OFF

ON

OPER

LED

OFF

Overflow

Water Level

Normal

BLINK

COMP/WVL is

forced OFF

8 min 8 min

Overflow when

unit is ON

Overflow when

unit is OFF

1 min

Notes:

1. The switch used for water level detection is closed under
normal condition, and is open when water overflow.

3. The "Over Flow" & “Normal” condition are indicated by logic “1”
& “0” at the LEVEL4 input pin respectively.

4. The “Overflow” condition can activate the water pump in SB
and operating modes.

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SELF TEST for General Controller

STEP 1: TURNING ON THE POWER .

Turn ON the power, make sure that the unit is in operation.

STEP 2 : ENABLE SELF TEST MODE

1. Use the Remote control to send the first settings to display / indoor unit
Heat mode, High IFAN, set temperature 16 ºC , no I FEEL Sleep or any Timer settings needed.

2. Cover the IR transmitter components in the head of the remote control so that it will not
transmit the signals to the indoor unit display.

3. Use the Remote control to send the second settings to display / indoor unit
Cool mode, Low IFAN, no I FEEL Sleep or any Timer settings.

4. Uncover the remote control IR transmitter and change the temperature settings.

If the display/indoor unit receive the settings properly the following steps will start:

STEP 3 : MODEL SETTING CONFIRMATION

1.The STAND-BY and COOL LEDS will indicate the operation mode as following:

COOL LEDSTAND-BY LEDOPERATION

MODE

OFFONST
OFFOFFRC

ONOFFSH
ONONRH

2. Testing the Model configuration. selected by the COMP, STAND-BY, TIMER LEDS and
FILTER will indicate the model configuration as follows:

FILTER LED TIMER LEDOPERATE LEDCOMP MODEL

OFFOFF

OFF ON

WNG

ONOFF

OFF ON

MBX

OFFON

OFF ON

WNX

OFFOFF

ONON

PRX

ONOFF

ONON

WMN1

OFFON

ONON

EMD/LS

ONON

ONON

ECC-K / DNC

OFFONOFFOFF

WMN 4

ONONOFF OFF

PXD

ONOFFONOFF

WMN 2/WHX

ONONONOFF

WMN 3

In this term the step motor will turn to HOME POSITION.

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STEP 3 :AUTO LED WALK TEST.

1) All the LEDS will turn OFF.

2) All the LEDS will turn ON for 1 second one by one in the following sequence :
STAND-BY  OPERATE  TIMER  FILTER  COOL  HEAT.

3) In PRX all the LEDS will turn ON for 1 second one by one in the following
sequence : 18 °c  20 °c  22 °c  24 °c  26 °c  28 °c  30 °c  High IFAN 
Auto IFAN  Med IFAN  Low IFAN  STAND-BY TIMER  FILTER COOL HEAT.

STEP 4: AUTO REALY WALK TEST:

All relays will turn ON one by one in the following sequence :
COMPRESSOR  OUTDOOR FANR. V.  HEATER 1  HEATER 2  INDOOR WATER
PUMP  SWING or OUTDOOR WATER PUMP  INDOOR FAN:  LOW  MID  HIGH.

When the relay walk test is completed, the next test will start automatically.

STEP 5: FREQUENCY TESTING:

If the frequency measuring process fails the COOL LED will turn ON.

In order to move to the next step press ON/OFF button on the remote control.

STEP 6 : INPUT TEST.

This stage is testing the analog real time indicators (thermistors, LEVEL and clock) according
the table below.

LED indicator Condition for LED to be ON

STBY LED

Room thermistor ≠≠≠≠ 25 °c

OPER LED

Indoor coil thermistor ≠≠≠≠ 25 °c

TIMER LED

Outdoor coil thermistor ≠≠≠≠ 25 °c

FILTER LED Clock

COOL LED LEVEL 2&3

HEAT LED LEVEL 4

STEP 7 : TIMING RESET TEST (WATCH DOG).

The test purpose is to find out the CPU rise time after power failure is between 1 to 3 sec,
test results are indicated on the LEDS : STAND-BY,OPER, TIMER AND FILTER are turning
ON one by one.

The results of the test are coded as follow:

pass condition
1 sec - STAND-BY and OPER are turn ON
2 sec - STAND-BY ,OPER and TIMER are turn ON
Fail condition
0 sec - STAND-BY is turn ON
3 sec - STAND-BY ,OPER , TIMER and FILTER are turn ON

When the timing reset test is completed, the next test will start automatically.

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STEP 8 : MEMORY TEST (EEPROM)

The test purpose is to check if the memory is functioning correctly.
The test result is reported by using the STAND-BY and FILTER LEDS:

LED indicator Condition for LED to be ON

STAND-BY LED Test passed

FILTER LED Test failed

AT THIS POINT THE SELF-TEST IS COMPLETED.

In order to terminate self-test mode the User can change the unit setting from "Cool Mode,
Low FAN" to " Cool Mode, Med FAN" or to wait without using the Remote control for 60 sec.

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STEP 8 : MEMORY TEST (EEPROM)

The test purpose is to check if the memory is functioning correctly.
The test result is reported by using the STAND-BY and FILTER LEDS:

LED indicator Condition for LED to be ON

STAND-BY LED Test passed

FILTER LED Test failed

AT THIS POINT THE SELF-TEST IS COMPLETED.

In order to terminate self-test mode the User can change the unit setting from "Cool Mode,
Low FAN" to " Cool Mode, Med FAN" or to wait without using the Remote control for 60 sec.

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RC/ST TEST

MODEL

CONFIGURATION

TEST

STEP MOTOR TEST

FREQUENCY

TEST

LEDS OFF

LEDS ON TEST

AUTO RELAY

TEST

SHORT JUMPER

J1

(CONTROL PCB)

PRESS ON

POWER

BUTTON

PRESS ON

MODE

BUTTON

INDOOR FAN
SPEED TEST

SELF TEST DIAGRAM

Step 1

Step 2

Step 3

FOR CONTROLLER (VERSION 4V5 OR HIGHER)

COOL

HEAT

COMPRESSOR

OUTDOOR FAN

R.V.

LOW

MEDIUM

HIGH

TIMER

OPERATE

STANDBY

BUZZER TEST

(ONE BEEP SOUND)

REMOTE CONTROL

TO CPU COMUNICATION

(TWO BEEPS SOUNDS)

THERMISTOR ANALOG

VOLTAGE CHECKING

EEPROM

MEMORY

TEST

END OF SELF

TEST

PRESS ON

RESET

BUTTON

PRESS ON

FAN

BUTTON

ON THE

REMOTE CONTROL

PRESS ON

MODE

BUTTON

PRESS ON

MODE

BUTTON

Step 4

Step 5

Step 6

Step 7

Step 8

DISCONNECT

JUMPER

J1