panasonic SBPAC1605017CE Datasheet

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Page 1

Order No. SBPAC1605017CE

SERVICE MANUAL & TEST RUN SERVICE MANUAL

Mini VRF SYSTEM

Model No.

Outdoor Units

Type Outdoor Unit Type

LE1

mini VRF System U-8LE1E8 U-10LE1E8

HP = horsepower

Rated Capacity

8 HP 10 HP

85464849348000

REFERENCE NO.SM830248-00

Page 2

Model No.

IMPORTANT! Please Read Before Starting

This air conditioner must be installed by the sales dealer or installer. This information is provided for use only by authorized persons.

For safe installation and trouble-free operation, you must:

Carefully read this instruction booklet before beginning. Follow each installation or repair step exactly as shown. This air conditioner shall be installed in accordance with

National Wiring Regulations.

This product is intended for professional use.

This equipment complies with EN/IEC 61000-3-12 provided that the short-circuit power Ssc is greater than or equal to the following table at the interface point between the user’s supply and the public system. It is the responsibility of the installer or user of the equipment to ensure, by consultation with the distribution network operator if necessary, that the equipment is connected only to a supply with a short- circuit power Ssc greater than or equal to the value in the table.

Permission from the power supplier is required when installing the 8 HP outdoor unit that is connected to a 16 A distribution network.

The product meets the technical requirements of

EN/IEC 61000-3-3.

Pay close attention to all warning and caution notices

given in this manual.

WARNING

This symbol refers to a hazard or unsafe practice which can result in severe personal injury or death.

CAUTION

This symbol refers to a hazard or unsafe practice which can result in personal injury or product or property damage.

If Necessary, Get Help

These instructions are all you need for most installation sites and maintenance conditions. If you require help for a special problem, contact our sales/service outlet or your certified dealer for additional instructions.

In Case of Improper Installation

The manufacturer shall in no way be responsible for improper installation or maintenance service, including failure to follow the instructions in this document.

SPECIAL PRECAUTIONS

WARNING When Wiring

ELECTRICAL SHOCK CAN CAUSE SEVERE PERSONAL INJURY OR DEATH. ONLY A QUALIFIED, EXPERIENCED ELECTRICIAN SHOULD ATTEMPT TO WIRE THIS SYSTEM.

• Do not supply power to the unit until all wiring and tubing are completed or reconnected and checked.

• Highly dangerous electrical voltages are used in this system. Carefully refer to the wiring diagram and these instructions when wiring. Improper connections and inadequate grounding can cause

accidental injury or death.

• Connect all wiring tightly. Loose wiring may cause overheating at connection points and a possible fire hazard.

• Provide a power outlet to be used exclusively for each unit.

• ELCB must be incorporated in the fixed wiring. Circuit breaker must be incorporated in the fixed wiring in accordance with the wiring regulations.

8 HP 10 HP

Circuit breaker 25 A 30 A

• Provide a power outlet exclusively for each unit, and full disconnection means having a contact separation by 3 mm in all poles must be incorporated in the fixed wiring in accordance with the wiring rules.

• To prevent possible hazards from insulation failure, the unit must be grounded.

• This equipment is strongly recommended to be installed with Earth Leakage Circuit Breaker (ELCB) or Residual Current Device (RCD). Otherwise, it may cause electrical shock and fire in case of equipment breakdown or insulation breakdown.

Ssc 1,535 kVA

10 HP

•TobeconnectingIndoorUnit

Type Indoor Unit Type

D1 1-WayCassette

L1 2-WayCassette

U1 4-WayCassette

Y2 4-WayCassette60×60 K1 Wall-Mounted K2 Wall-Mounted T2 Ceiling F2 LowSilhouetteDucted M1 SlimLowStaticDucted P1 FloorStanding R1 ConcealedFloorStanding

Type Indoor Unit Type

D1 1-WayCassette

L1 2-WayCassette

U1 4-WayCassette

K1 Wall-Mounted T2 Ceiling F2 LowSilhouetteDucted P1 FloorStanding R1 ConcealedFloorStanding

Type Indoor Unit Type

HighStaticPressureDucted

15 22 28 36 45 56 60

S-22ML1E5 S-28ML1E5 S-36ML1E5 S-45ML1E5 S-56ML1E5

S-22MU1E5A S-28MU1E5A S-36MU1E5A S-45MU1E5A S-56MU1E5A S-60MU1E5A

S-15MY2E5A S-22MY2E5A S-28MY2E5A S-36MY2E5A S-45MY2E5A S-56MY2E5A

S-15MK2E5A S-22MK2E5A S-28MK2E5A S-36MK2E5A

S-15MF2E5A S-22MF2E5A S-28MF2E5A S-36MF2E5A S-45MF2E5A S-56MF2E5A S-60MF2E5A S-15MM1E5A S-22MM1E5A S-28MM1E5A S-36MM1E5A S-45MM1E5A S-56MM1E5A

S-22MP1E5 S-28MP1E5 S-36MP1E5 S-45MP1E5 S-56MP1E5 S-22MR1E5 S-28MR1E5 S-36MR1E5 S-45MR1E5 S-56MR1E5

71 / 73 90 106 140 160

S-73MD1E5 S-73ML1E5

S-73MU1E5A S-90MU1E5A S-106MU1E5A S-140MU1E5A S-160MU1E5A S-73MK1E5A S-106MK1E5A S-73MT2E5A S-106MT2E5A S-140MT2E5A S-73MF2E5A S-90MF2E5A S-106MF2E5A S-140MF2E5A S-160MF2E5A

S-71MP1E5 S-71MR1E5

Rated Capacity

180 224 280

S-180ME2E5 S-224ME2E5 S-280ME2E5

Rated Capacity

S-28MD1E5 S-36MD1E5 S-45MD1E5 S-56MD1E5

Rated Capacity

S-45MK1E5A S-56MK1E5A

S-36MT2E5A S-45MT2E5A S-56MT2E5A

Page 3

IMPORTANT! Please Read Before Starting

SPECIAL PRECAUTIONS

This air conditioner must be installed by the sales dealer or installer. This information is provided for use only by authorized persons.

For safe installation and trouble-free operation, you must:

Carefully read this instruction booklet before beginning. Follow each installation or repair step exactly as shown. This air conditioner shall be installed in accordance with

National Wiring Regulations.

This product is intended for professional use.

Permission from the power supplier is required when installing the 8 HP outdoor unit that is connected to a 16 A distribution network.

This equipment complies with EN/IEC 61000-3-12 provided that the short-circuit power Ssc is greater than or equal to the following table at the interface point between the user’s supply and the public system. It is the responsibility of the installer or user of the equipment to ensure, by consultation with the distribution network operator if necessary, that the equipment is connected only to a supply with a shortcircuit power Ssc greater than or equal to the value in the table.

10 HP

Ssc 1,535 kVA

The product meets the technical requirements of

EN/IEC 61000-3-3.

Pay close attention to all warning and caution notices

given in this manual.

This symbol refers to a hazard or unsafe

WARNING

CAUTION

If Necessary, Get Help

In Case of Improper Installation

The manufacturer shall in no way be responsible for improper installation or maintenance service, including failure to follow the instructions in this document.

practice which can result in severe personal injury or death.

This symbol refers to a hazard or unsafe practice which can result in personal injury or product or property damage.

WARNING When Wiring

ELECTRICAL SHOCK CAN CAUSE SEVERE PERSONAL INJURY OR DEATH. ONLY A QUALIFIED, EXPERIENCED ELECTRICIAN SHOULD ATTEMPT TO WIRE THIS SYSTEM.

• Do not supply power to the unit until all wiring and tubing are completed or reconnected and checked.

• Highly dangerous electrical voltages are used in this system. Carefully refer to the wiring diagram and these instructions when wiring. Improper connections and inadequate grounding can cause

accidental injury or death.

• Connect all wiring tightly. Loose wiring may cause overheating at connection points and a possible fire hazard.

• Provide a power outlet to be used exclusively for each unit.

• ELCB must be incorporated in the fixed wiring. Circuit breaker must be incorporated in the fixed wiring in accordance with the wiring regulations.

8 HP 10 HP

Circuit breaker 25 A 30 A

• To prevent possible hazards from insulation failure, the unit must be grounded.

Page 4

When Transporting

When Servicing

• Turn the power OFF at the main power box (mains), wait at least 10 minutes until it is discharged, then open the unit to check or repair electrical parts and wiring.

• Keep your fingers and clothing away from any moving parts.

• Clean up the site after you finish, remembering to check that no metal scraps or bits of wiring have been left inside the unit.

WARNING

• This product must not be modified or disassembled under any circumstances. Modified or disassembled unit may cause fire, electric shock or injury.

• Do not clean inside the indoor and outdoor units by users. Engage authorized dealer or specialist for cleaning.

• In case of malfunction of this appliance, do not repair by yourself. Contact to the sales dealer or service dealer for a repair.

CAUTION

• Ventilate any enclosed areas when installing or testing the refrigeration system. Leaked refrigerant gas, on contact with fire or heat, can produce dangerously toxic gas.

• Confirm after installation that no refrigerant gas is leaking. If the gas comes in contact with a burning stove, gas water heater, electric room heater or other heat source, it can cause the generation of toxic gas.

Others

CAUTION

• Do not touch the air inlet or the sharp aluminum fins of the outdoor unit. You may get injured.

• Do not sit or step on the unit, you may fall down accidentally.

• Do not stick any object into the FAN CASE. You may be injured and the unit may be damaged.

• It may need two or more people to carry out the installation work.

• Be careful when picking up and moving the indoor and outdoor units. Get a partner to help, and bend your knees when lifting to reduce strain on your back. Sharp edges or thin aluminum fins on the air conditioner can cut your fingers.

When Installing…

Select an installation location which is rigid and strong enough to support or hold the unit, and select a location for easy maintenance.

…In a Room

Properly insulate any tubing run inside a room to prevent “sweating” that can cause dripping and water damage to walls and floors.

…In Moist or Uneven Locations

Use a raised concrete pad or concrete blocks to provide a solid, level foundation for the outdoor unit. This prevents water damage and abnormal vibration.

…In an Area with High Winds

Securely anchor the outdoor unit down with bolts and a metal frame. Provide a suitable air baffle.

…In a Snowy Area (for Heat Pumptype Systems)

Install the outdoor unit on a raised platform that is higher than drifting snow. Provide snow vents.

CAUTION

Keep the fire alarm and the air outlet at least

1.5 m away from the unit.

When Connecting Refrigerant Tubing

Pay particular attention to refrigerant leakages.

WARNING

• When performing piping work, do not mix air except for specified refrigerant (R410A) in refrigeration cycle. It causes capacity down, and risk of explosion and injury due to high tension inside the refrigerant cycle.

• If the refrigerant comes in contact with a flame, it produces a toxic gas.

• Do not add or replace refrigerant other than specified type. It may cause product damage, burst and injury, etc.

• Ventilate the room immediately, in the event that is refrigerant gas leaks during the installation. Be careful not to allow contact of the refrigerant gas with a flame as this will cause the generation of toxic gas.

• Keep all tubing runs as short as possible.

• Apply refrigerant lubricant to the matching surfaces of the flare and union tubes before connecting them, then tighten the nut with a torque wrench for a leak-free connection.

• Check carefully for leaks before starting the test run.

• Do not leak refrigerant while piping work for an installation or re-installation, and while repairing refrigeration parts. Handle liquid refrigerant carefully as it may cause frostbite.

iii

Page 5

When Servicing

Others

• Turn the power OFF at the main power box (mains), wait at least 10 minutes until it is discharged, then open the unit to check or repair electrical parts and wiring.

• Keep your fingers and clothing away from any moving parts.

• Clean up the site after you finish, remembering to check that no metal scraps or bits of wiring have been left inside the unit.

WARNING

• This product must not be modified or disassembled under any circumstances. Modified or disassembled unit may cause fire, electric shock or injury.

• Do not clean inside the indoor and outdoor units by users. Engage authorized dealer or specialist for cleaning.

• In case of malfunction of this appliance, do not repair by yourself. Contact to the sales dealer or service dealer for a repair.

CAUTION

• Do not touch the air inlet or the sharp aluminum fins of the outdoor unit. You may get injured.

• Do not sit or step on the unit, you may fall down accidentally.

• Do not stick any object into the FAN CASE. You may be injured and the unit may be damaged.

CAUTION

• Ventilate any enclosed areas when installing or testing the refrigeration system. Leaked refrigerant gas, on contact with fire or heat, can produce dangerously toxic gas.

Page 6

Check of Density Limit

Precautions for Installation Using New Refrigerant

1. Care regarding tubing

1-1. Process tubing

Material: Use seamless phosphorous deoxidized copper tube for refrigeration. Wall thickness shall comply with the applicable

legislation. The minimal wall thickness must be in accordance with the table below. For tubes of ø22.22 or larger, use the material of temper 1/2H or H (Hard copper tube). Do not bend the hard copper tube.

Tubing size: Be sure to use the sizes indicated in the table below.

For the renewal tubing size, refer to the Technical Data.

Use a tube cutter when cutting the tubing, and be sure to remove any flash. This also applies to distribution joints (optional).

When bending tubing, use a bending radius that is 4 times the outer diameter of the tubing or larger.

CAUTION

Use sufficient care in handling the tubing. Seal the tubing ends with caps or tape to prevent dirt, moisture, or other foreign substances from entering. These substances can result in system malfunction.

Unit: mm

)ebut reppoc tfoS( O - repmeTlairetaM

Copper tube

Outer diameter 6.35 9.52 12.7 15.88 19.05

Wall thickness 0.8 0.8 0.8 1.0 1.2

Unit: mm

Material Temper - 1/2 H, H (Hard copper tube)

Copper tube

Outer diameter 22.22 25.4

Wall thickness 1.0 1.0

1-2. Prevent impurities including water, dust and oxide from entering the tubing. Impurities can cause R410A refrigerant deterioration

and compressor defects. Due to the features of the refrigerant and refrigerating machine oil, the prevention of water and other impurities becomes more important than ever.

2. Be sure to recharge the refrigerant only in liquid form.

2-1. Since R410A is a non-azeotrope, recharging the refrigerant in gas form can lower performance and cause defects in the unit.

2-2. Since refrigerant composition changes and performance decreases when gas leaks, collect the remaining refrigerant and recharge

the required total amount of new refrigerant after fixing the leak.

3. Different tools required

3-1. Tool specifications have been changed due to the characteristics of R410A.

Some tools for R22- and R407C-type refrigerant systems cannot be used.

Item New tool?

R407C tools compatible with R410A?

Remarks

Manifold gauge

Manifold gauge Yes No Types of refrigerant, refrigerating machine oil,

and pressure gauge are different.

Charge hose Yes No To resist higher pressure, material must be

changed.

Vacuum pump Yes Yes Use a conventional vacuum pump if it is equipped

with a check valve. If it has no check valve, purchase and attach a vacuum pump adapter.

Leak detector Yes No Leak detectors for CFC and HCFC that react to

chlorine do not function because R410A contains no chlorine. Leak detectors for HFC134a can be used for R410A.

Vacuum pump

Outlet Inlet

Flaring oil Yes No For systems that use R22, apply mineral oil

(Suniso oil) to the flare nuts on the tubing to prevent refrigerant leakage. For machines that use R407C or R410A, apply synthetic oil (ether oil) to the flare nuts.

* Using tools for R22 and R407C and new tools for R410A together can cause defects.

3-2. Use R410A exclusive cylinder only.

Single-outlet valve

(with siphon tube) Liquid refrigerant should be recharged with the cylinder standing on end as shown.

Valve

Liquid

Check the amount of refrigerant in the system and floor space of the room according to the legislation on refrigerant drainage. If there is no applicable legislation, follow the standards described below.

The room in which the air conditioner is to be installed requires a design that in the event of refrigerant gas leaking out, its density will not exceed a set limit.

The refrigerant (R410A), which is used in the air conditioner, is safe, without the toxicity or combustibility of ammonia, and is not restricted by laws imposed to protect the ozone layer. However, since it contains more than air, it poses the risk of suffocation if its density should rise excessively. Suffocation from leakage of refrigerant is almost non-existent. With the recent increase in the number of high density buildings, however, the installation of multi air conditioner systems is on the increase because of the need for effective use of floor space, individual control, energy conservation by curtailing heat and carrying power, etc. Most importantly, the multi air conditioner system is able to replenish a large amount of refrigerant compared to conventional individual air conditioners. If a single unit of the multi air conditioner system is to be installed in a small room, select a suitable model and installation procedure so that if the refrigerant accidentally leaks out, its density does not reach the limit (and in the event of an emergency, measures can be made before injury can occur). In a room where the density may exceed the limit, create an opening with adjacent rooms, or install mechanical ventilation combined with a gas leak detection device. The density is as given below.

Min. volume of the indoor unit installed room (m

< Density limit (kg/m

The density limit of refrigerant which is used in multi air conditioners is 0.44 kg/m

Total amount of refrigerant (kg)

)

(ISO 5149).

)

NOTE

1. The standards for minimum room volume are as follows.

(1) No partition (shaded portion)

(3) If an indoor unit is installed in each partitioned room and

the refrigerant tubing is interconnected, the smallest room of course becomes the object. But when mechanical ventilation is installed interlocked with a gas leakage detector in the smallest room where the density limit is exceeded, the volume of the next smallest room becomes the object.

Refrigerant tubing

Very small room

Small

room

Mechanical ventilation device – Gas leak detector

Medium room

Large room

2. The minimum indoor floor space compared with the amount of refrigerant is roughly as follows: (When the ceiling is 2.7 m high)

229.5

216.0

202.5

189.0

175.5

162.0

148.5

135.0

121.5

108.0

94.5

81.0

Min. indoor volume

Min. indoor floor area

(when the ceiling is 2.7 m high)

67.5

54.0

40.5

27.0

13.5

0.0

Range below the density limit of

0.44 kg/m³ (Countermeasures not needed)

20100 30 40 60 70 80 90 10050

Total amount of refrigerant

Range above the density limit of

0.44 kg/m³ (Countermeasures needed)

Outdoor unit

Indoor unit

(2) When there is an effective opening with the adjacent room

for ventilation of leaking refrigerant gas (opening without a door, or an opening 0.15% or larger than the respective floor spaces at the top or bottom of the door).

Outdoor unit

Refrigerant tubing

Indoor unit

Page 7

Precautions for Installation Using New Refrigerant

1. Care regarding tubing

1-1. Process tubing

Material: Use seamless phosphorous deoxidized copper tube for refrigeration. Wall thickness shall comply with the applicable

Tubing size: Be sure to use the sizes indicated in the table below.

For the renewal tubing size, refer to the Technical Data.

Use a tube cutter when cutting the tubing, and be sure to remove any flash. This also applies to distribution joints (optional).

When bending tubing, use a bending radius that is 4 times the outer diameter of the tubing or larger.

CAUTION

Copper tube

1-2. Prevent impurities including water, dust and oxide from entering the tubing. Impurities can cause R410A refrigerant deterioration

and compressor defects. Due to the features of the refrigerant and refrigerating machine oil, the prevention of water and other impurities becomes more important than ever.

2. Be sure to recharge the refrigerant only in liquid form.

2-1. Since R410A is a non-azeotrope, recharging the refrigerant in gas form can lower performance and cause defects in the unit.

2-2. Since refrigerant composition changes and performance decreases when gas leaks, collect the remaining refrigerant and recharge

the required total amount of new refrigerant after fixing the leak.

3. Different tools required

3-1. Tool specifications have been changed due to the characteristics of R410A.

Some tools for R22- and R407C-type refrigerant systems cannot be used.

Item New tool?

Manifold gauge Yes No Types of refrigerant, refrigerating machine oil,

Charge hose Yes No To resist higher pressure, material must be

Vacuum pump Yes Yes Use a conventional vacuum pump if it is equipped

Leak detector Yes No Leak detectors for CFC and HCFC that react to

Flaring oil Yes No For systems that use R22, apply mineral oil

* Using tools for R22 and R407C and new tools for R410A together can cause defects.

3-2. Use R410A exclusive cylinder only.

Unit: mm

)ebut reppoc tfoS( O - repmeTlairetaM

Outer diameter 6.35 9.52 12.7 15.88 19.05

Wall thickness 0.8 0.8 0.8 1.0 1.2

Unit: mm

Material Temper - 1/2 H, H (Hard copper tube)

Outer diameter 22.22 25.4

Wall thickness 1.0 1.0

R407C tools compatible with R410A?

Remarks

and pressure gauge are different.

changed.

with a check valve. If it has no check valve, purchase and attach a vacuum pump adapter.

chlorine do not function because R410A contains no chlorine. Leak detectors for HFC134a can be used for R410A.

(Suniso oil) to the flare nuts on the tubing to prevent refrigerant leakage. For machines that use R407C or R410A, apply synthetic oil (ether oil) to the flare nuts.

Single-outlet valve

(with siphon tube) Liquid refrigerant should be recharged with the cylinder standing on end as shown.

Manifold gauge

Vacuum pump

Outlet Inlet

Valve

Liquid

Page 8

Important Information Regarding The Refrigerant Used

This product contains fluorinated greenhouse gases covered by the Kyoto Protocol. Do not vent gases into the atmosphere.

Refrigerant type: R410A

(1)

GWP

value: 1975

(1)

GWP = global warming potential

Periodical inspections for refrigerant leaks may be required depending on European or local legislation. Please contact your local dealer for more information.

Please fill in with indelible ink,

1 the factory refrigerant charge of the product

the additional refrigerant amount charged in the field and

122

+ the total refrigerant charge

on the refrigerant charge label supplied with the product.

The filled out label must be adhered in the proximity of the product charging port (e.g. onto the inside of the service cover).

* English text printed on this label is original. Each

5 6

1. Factory refrigerant charge of the product: see unit name plate

2. Additional refrigerant amount charged in the field

3. Total refrigerant charge

4. Contains fluorinated greenhouse gases covered by the Kyoto Protocol

5. Outdoor unit

6. Refrigerant cylinder and manifold for charging

language label will be sealed on this original text.

vii

Page 9

—

Section 1: CONTROL FUNCTIONS - Outdoor Unit ............................. 1-1

1. Introduction ............................................................. 1-2

2. Compressor Control ...................................................... 1-3

3. Special Control .......................................................... 1-9

4. Outdoor Unit Fan Control .................................................. 1-11

5. Outdoor Unit CCU (command controller unit) Control ............................ 1-14

6. Oil Control ............................................................. 1-19

7. 4-Way Valve Adjustment Control ............................................ 1-21

8. Defrost Control ......................................................... 1-22

9. Demand Control ........................................................ 1-24

10. Other Functions ......................................................... 1-27

11. Detailed Settings in EEPROM of Outdoor Unit ................................. 1-29

12. Outdoor Unit Control PCB ................................................. 1-31

13. Electrical Data .......................................................... 1-36

Section 2: CONTROL FUNCTIONS - Indoor Unit .............................. 2-1

1. Room Temperature Control ................................................. 2-2

2. Heating Standby ......................................................... 2-4

3. Automatic Fan Speed Control ............................................... 2-5

4. Indoor Unit MOV Control ................................................... 2-6

5. Drain Pump Control ...................................................... 2-6

6. Automatic Heating / Cooling Control .......................................... 2-7

7. Discharge Air Temperature Control ........................................... 2-8

8. RAP Valve Kit Control ..................................................... 2-8

9. Automatic Flap Control .................................................... 2-9

10. Filter Sign .............................................................. 2-9

11. Fan Control during Dry Mode .............................................. 2-10

12. Ventilation Fan Output .................................................... 2-11

13. T10 Terminal ........................................................... 2-11

14. Parameter ............................................................. 2-12

Section 3: OUTDOOR UNIT REPAIR PROCEDURES ........................... 3-1

1. Removing Panels ......................................................... 3-2

2. Discharging Compressor Oil ................................................ 3-3

3. Recovering Refrigerant .................................................... 3-4

4. Checking for Leakage After Repair ........................................... 3-9

5. Evacuating System ...................................................... 3-10

6. Charging Compressor Oil ................................................. 3-11

7. Pumping Out Refrigerant from Outdoor Unit ................................... 3-15

8. Compressor ............................................................ 3-18

viii

Page 10

Section 4: OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER ............ 4-1

1. Overview ............................................................... 4-2

2. Functions ............................................................... 4-3

3. Ordinary Display Controls and Functions ...................................... 4-4

4. Monitoring Operations ..................................................... 4-9

5. Outdoor Unit Alarm History Monitor ......................................... 4-11

6. Mode Settings .......................................................... 4-12

Section 5: REMOTE CONTROLLER FUNCTIONS ............................. 5-1

1. Simple Settings Function ................................................... 5-2

2. Detailed Settings Function .................................................. 5-8

3. Remote Controller Servicing Functions ....................................... 5-21

Section 6: TROUBLE DIAGNOSIS .......................................... 6-1

1. Contents of Remote Controller Switch Alarm Display .............................6-2

2. Outdoor Unit Control Panel LED Display ......................................6-4

3. Mini VRF Alarm Codes .................................................... 6-5

4. Inspection and Characteristics of Parts ...................................... 6-21

5. Test Pin ............................................................... 6-24

6. Symptom: Thermostat in OFF continues or cycles OFF & ON too frequently .......... 6-25

Section 7: TEST RUN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

1. Preparing for Test Run .....................................................7-2

2. Test Run Procedure .......................................................7-3

3. Main Outdoor Unit P.C.Board Setting .......................................... 7-4

4. Auto Address Setting ...................................................... 7-7

5. Setting Test Run Remote Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-15

6. Caution for Pump Down ................................................... 7-16

7. Self-Diagnosis Function Table and Contents of Alarm Display ..................... 7-16

Page 11

Mini VRF SYSTEM

Contents

Control Functions - Outdoor unit

1. CONTROL FUNCTIONS - Outdoor unit

1. Introduction ........................................................... 1-2

2. Compressor Control .................................................... 1-3

3. Special Control ........................................................ 1-9

4. Outdoor Unit Fan Control ............................................... 1-11

5. Outdoor Unit CCU (command controller unit) Control ....................... 1-14

6. Oil Control ........................................................... 1-19

7. 4-Way Valve Adjustment Control ......................................... 1-21

8. Defrost Control ....................................................... 1-22

9. Demand Control ....................................................... 1-24

10. Other Functions ....................................................... 1-27

11. Detailed Settings in EEPROM of Outdoor Unit ..............................1-29

12. Outdoor Unit Control PCB ..............................................1-31

13. Electrical Data ........................................................1-36

1 - 1

Page 12

Mini VRF SYSTEM

2WAY VRF SYSTEM

Control Functions

3. Compressor Control

The inverter compressor can operate within the range in the table below.

When the high pressure is over 2.8MPa, the upper limit frequency is restricted.

The frequency range in the table above is subject to change without notice.*

*1 The minimum Hz changes according to the outdoor air temperature during cooling operation.

*2 ・The upper limit frequency is sometimes restricted to 50Hz until the compressor gets warmer. ・During the oil recovery control among the systems or defrost control, the upper limit frequency is 60Hz.

・When operation started under the temperature of 10°C＜ outdoor air temperature ≤ 48°C, the minimum Hz becomes 15Hz.

(2) Operating Frequency Range of Inverter Compressor

Type of outdoor unit

Minimum frequency (Hz) *1

Maximum frequency (Hz) *2 81.3

8HP 10HP

89.7

15 15

If the low pressure is over 1.6MPa during operation of the inverter compressor, the system is stopped. (P27: Pre-trip)

1 2

48°C

43°C

20°C

10°C

1. Introduction

Mini VRF SYSTEM is a multi system that is connected to a single outdoor unit. The outdoor unit contains an inverter compressor. To operate this system, the below settings must be made at the time of the test run.

Table 1-1

At shipment from factory

Settable range

Setting item

System address 1 System 1 – 30

No. of indoor units 1 1 – 15 units

Table 1-2

Control Functions - Outdoor unit

8 HP 10 HP

Maximum number of connected indoor units 15 15

Be sure to connect indoor units so that the resulting indoor-outdoor capacity ratio (total capacity of all indoor units compared with the outdoor unit capacity) is within the range of 50% – 130%.

1 - 2

Page 13

Mini VRF SYSTEM

2WAY VRF SYSTEM

Control Functions

3. Compressor Control

2. Compressor Control

(1) Compressors Mounted in the Outdoor Units

Type of outdoor unit 8HP 10HP

Compressor 1

* The inverter compressor is operated according to the load and does not operate beyond outdoor unit capacity.

Inverter compressor

(High pressure rotary)

● ●

Control Functions - Outdoor unit

(2) Operating Frequency Range of Inverter Compressor

The inverter compressor can operate within the range in the table below.

When the high pressure is over 2.8MPa, the upper limit frequency is restricted. If the low pressure is over 1.6MPa during operation of the inverter compressor, the system is stopped.

(P27: Pre-trip)

Type of outdoor unit

8HP 10HP

Minimum frequency (Hz) *1

Maximum frequency (Hz) *2 81.3

The frequency range in the table above is subject to change without notice.*

*1 The minimum Hz changes according to the outdoor air temperature during cooling operation.

48°C

43°C

15 15

89.7

・When operation started under the temperature of 10°C＜ outdoor air temperature ≤ 48°C, the minimum Hz becomes 15Hz.

20°C

10°C

1 - 3

Page 14

2. Compressor Control

2WAY VRF SYSTEM

Control Functions

3. Compressor Control

Compressor capacity can increase

6.5

Te_tgt_max.

Compressor capacity cannot increase

Compressor capacity decreases

Max. load level

6.0

3.0

deg

2.5

Te_tgt_min.

6.0

3.0

16.0

unit: °C

13.0

11.0

8.0

Area B

Area C

Area A

Evaporation temperature area

3. Compressor Control

2WAY VRF SYSTEM

Control Functions

4-1. Evaporation temperature (= Te) control

The cooling capacity is adjusted with this control. It prevents freezing of the indoor unit heat exchanger and the dew to the outside panel of the indoor unit. The capacity is adjusted according to the following figure.

If the test run is continued for a long time, the mist may occur but it is not abnormal.* If more than 1 indoor unit is in test run mode, the evaporation temperature control is not applicable. Once the indoor unit is selected for the test run, the thermostat will not be turned OFF. After the last indoor unit is operated in the test run mode, the test run is automatically cancelled after 1 hour.

4-2. Condensation Temperature Control

Target temperature of the Area B is different between cooling and heating operation.

In Cooling Mode The purpose of this control at cooling is to prevent abnormal high-pressure.

The evaporation temperature area changes depending on the maximum load level in each indoor unit as shown on previous page.

The Area C is regarded as Area B for 6 minutes after compressor starts.

Test run mode in cooling operation is used when the room temperature is low and the indoor unit thermostat is not turn ON. This mode is used for operation check when the outdoor unit is fully operated or additional refrigerant charge without stopping the system.

When the system operates in a minimum capacity, the system will continue operating for at least 6 minutes if the evaporation temperature area is Area C.

During special controls such as defrosting or oil recovering between the systems, the compressor capacity will not be controlled by the evaporation temperature control area.

If the outdoor unit is stopped while the evaporation temperature is in Area C, the system may operate from the lower compressor capacity when starting next time.

Test run mode

In Heating Mode Heating capacity is adjusted with this control. It also prevents abnormal high-pressure simultaneously. The capacity is controlled in the following diagram.

Mini VRF SYSTEM

Control Functions - Outdoor unit

(3) Forced Stopping of Compressor

Once a compressor stops, it will not start for a period of 3 minutes (3-minute forced OFF). However, this is not applied when the compressor was forced to stop as the result of a special control operation. (Start control, Defrost control, Refrigerant oil recovery control, etc.)

(4) Horsepower Control (Roadmap Control)

Horsepower control (start & stop of compressor and increase & decrease of inverter frequency) are controlled according to the numerical value of the pressure sensor installed at the outdoor unit and the temperature sensor installed at the indoor unit heat exchanger.

* The pressure detected by the pressure sensor is converted to the saturated temperature.

There are two types of controls; one is the pressure detected by the pressure sensor and the other is detected by the saturated temperature.

High pressure saturated temperature is converted from values detected by the high pressure sensor. Low pressure saturated temperature is converted from values detected by the low pressure sensor.

This control is performed every 30 seconds.

When cooling operation, evaporation temperature (= antifreeze control) and condensation temperature

(= high pressure prevention control) are applied. When heating operation, condensation temperature (= high pressure prevention control) is applied.

Definition of evaporation temperature (Te) Lowest temperature of all indoor units’ evaporation temperature (E1, E3) in the system including the stopped indoor units

Definition of condensation temperature (Tc) Outdoor units’ high pressure saturated temperature

Load level varies from a minimum of 0 to a maximum of 30 on 1 to 1 basis up to 31 levels. When the indoor unit stops (including thermostat OFF), the level shows “0”. In the case of test run mode, the actual level implies “30” even if a PC monitor indicates “31”. * In the case that the compressor is stopped from such as special controls, load level does not turn to “0”

even if the indoor unit is most likely to be in stopped state.

The indoor unit demand level varies according to the following 2 conditions.

Intake temperature difference:

Difference between indoor unit remote control set temperature and intake temperature (TA)

Discharge temperature difference:

Difference between preset discharge setting temperature according to the type of indoor unit and actual discharge temperature (TF)

Load level increases when the differential temperature noted above indicates plus (+) value and decreases when it indicates minus (-) value. However, the types of units which are set to control the discharge temperature vary according to the lowest value from the intake temperature difference and discharge temperature difference. Horsepower is controlled by the maximum value of all indoor units load level.

1 - 4

Page 15

2. Compressor Control

3. Compressor Control

2WAY VRF SYSTEM

Control Functions

Mini VRF SYSTEM

Control Functions - Outdoor unit

4-1. Evaporation temperature (= Te) control

Evaporation temperature area

deg

Compressor capacity can increase

6.5

Te_tgt_max.

Te_tgt_min.

The evaporation temperature area changes depending on the maximum load level in each indoor unit as shown on previous page.

The Area C is regarded as Area B for 6 minutes after compressor starts. When the system operates in a minimum capacity, the system will continue operating for at least 6 minutes if the evaporation temperature area is Area C.

During special controls such as defrosting or oil recovering between the systems, the compressor capacity will not be controlled by the evaporation temperature control area.

If the outdoor unit is stopped while the evaporation temperature is in Area C, the system may operate from the lower compressor capacity when starting next time.

Test run mode Test run mode in cooling operation is used when the room temperature is low and the indoor unit thermostat is not turn ON. This mode is used for operation check when the outdoor unit is fully operated or additional refrigerant charge without stopping the system.

6.0

3.0

2.5

Area A

Compressor capacity cannot increase

Compressor capacity decreases

Area B

Area C

16.0

13.0

8.0

Max. load level

unit: °C

11.0

6.0

3.0

4-2. Condensation Temperature Control

Target temperature of the Area B is different between cooling and heating operation.

In Cooling Mode

The purpose of this control at cooling is to prevent abnormal high-pressure.

In Heating Mode

Heating capacity is adjusted with this control. It also prevents abnormal high-pressure simultaneously. The capacity is controlled in the following diagram.

1 - 5

Page 16

2. Compressor Control

2WAY VRF SYSTEM

Control Functions

3. Compressor Control

2WAY VRF SYSTEM

Control Functions

* Discharge temperature that is used for this control is the highest temperature among all compressors.

Test Run Test run mode in heating operation is used when the room temperature is high and the indoor unit thermostat is not turned ON. This mode is used for operation check when the outdoor unit is fully operated or additional refrigerant charge without stopping the system.

When the system operates in a minimum capacity, the system will continue operating for at least 6 minutes if the condensation temperature area is the Area C. If it maintains in the Area C, the thermostat may turn OFF.

Once the indoor unit is selected for the test run, the thermostat will not be turned OFF. However, condensation temperature control is performed in order to prevent the high load according to the figure shown on previous page. After the last indoor unit is operated in the test run mode, the test run is automatically cancelled after 1 hour.

4-3. Protection Control

Compressor stops

Horsepower decreases

Horsepower cannot increase

Horsepower can increase

Capacity goes down 2.0HP

Capacity goes down 1.0HP

Capacity goes down 0.5HP

Compressor discharge temperature protection The compressor capacity is controlled according to the figure below.

Low pressure protection control In order to prevent the excessive decrease of low pressure, the compressor capacity is controlled according to the figure below.

106

105

104

100

Capacity goes down 0.3HP

°C

No restriction

Capacity goes up slowly

0.25

0.20 Capacity cannot increase

Capacity goes down

H06 trip (Continuous for 2 minutes)

0.17

0.06

H06 trip0.02

Low pressure

MPa

Mini VRF SYSTEM

Control Functions - Outdoor unit

・Standard setting (at the shipment)

°C °C

PX=58.0 PX=58.0

57.9

55.1

55.0

53.0

52.9

Thermostat OFF

Horsepower decrease

Horsepower increase prohibited

Horsepower increase possible

Area D

Area C

Area B

Area A

57.9

50.1

50.0

48.0

47.9

Thermostat OFF

Horsepower decrease

Horsepower increase prohibited

Horsepower increase possible

Area D

Area C

Area B

Area A

42.0

34.0

33.0

40.5

°C

50.0

48.0

・Renewal setting (JP001 cut on all outdoor unit PCB) * For details, see Section 9 of Technical Data.

52.5

PX=

52.5-0.1

49.1

49.0

47.0

46.9

°C °C

Thermostat OFF

Horsepower decrease

Horsepower increase prohibited

Horsepower increase possible

Area D

Area C

Area B

Area A

52.5

PX=

52.5-0.1

48.1

48.0

47.0

46.9

Thermostat OFF

Horsepower decrease

Horsepower increase prohibited

Horsepower increase possible

Area D

Area C

Area B

Area A

Max. required level

33.5

32.5

15 300

40.5

39.5

°C

48.0

47.0

1 - 6

15 300

Max. required level

Page 17

2. Compressor Control

3. Compressor Control

2WAY VRF SYSTEM

Control Functions

Mini VRF SYSTEM

Control Functions - Outdoor unit

When the temperature falls in the Area D (over PX temperature), the operation stops within 0 to 30 seconds at the interval of the roadmap control. After Tc falls in the Area D and the thermostat is turned OFF, the system may resume operating from the lower compressor capacity. When the system operates in a minimum capacity, the system will continue operating for at least 6 minutes if the condensation temperature area is the Area C. If it maintains in the Area C, the thermostat may turn OFF. Test Run Test run mode in heating operation is used when the room temperature is high and the indoor unit thermostat is not turned ON. This mode is used for operation check when the outdoor unit is fully operated or additional refrigerant charge without stopping the system.

4-3. Protection Control

Compressor discharge temperature protection

The compressor capacity is controlled according to the figure below. * Discharge temperature that is used for this control is the highest temperature among all compressors.

°C

106

105

104

100

Compressor stops

Horsepower decreases

Horsepower cannot increase

Horsepower can increase

Capacity goes down 2.0HP

Capacity goes down 1.0HP

Capacity goes down 0.5HP

Capacity goes down 0.3HP

Low pressure protection control

In order to prevent the excessive decrease of low pressure, the compressor capacity is controlled according to the figure below.

Low pressure

MPa

0.25

0.20

0.17

0.06

No restriction

Capacity goes up slowly

Capacity cannot increase

Capacity goes down

H06 trip (Continuous for 2 minutes)

H06 trip0.02

1 - 7

Page 18

2. Compressor Control

4. Special Control

2WAY VRF SYSTEM

Control Functions

Items Remarks Indication on PCB

This valve turns OFF at cooling mode, and turns ON at heating mode.

When the outdoor unit stops, the 4-way valve maintains in the same state as before.

Regarding the operation in defrost mode, see the section "8. Defrost Control".

Solenoid valve

Motor Operated Valve

Crankcase heater

4-way valve

Oil recovery valve

2 valve

MOV for heat exchanger 1

MOV for heat exchanger 2

Crankcase heater

20S

ORVR

MOV1

MOV2

(1) 4-way Valve [20S]

This valve turns ON for 5 seconds before the inverter compressor starts. After the inverter compressor starts, the valve is ON for 2 minutes. After that, it turns OFF.

SAVE valve

5 seconds 2 minutes

Inverter compressor starts

Compressor

Valve turns ON

α β

3.00

MPa

2.90

3.42

Renewal

setting

Standard

setting

3.32

Valve turns OFF

This valve turns ON for 30 seconds after the outdoor unit stops. After that, it turns OFF. This valve turns ON when the high pressure sensor detects α to prevent abnormal pressure shown in the table at right. This valve turns OFF when the high pressure goes down below β shown in the table at right. This valve turns ON when the high pressure switch is activated. This valve stays ON for 10 seconds after the high pressure switch returns in normal. After that, it turns OFF. This valve might turn ON when the system capacity is excessive although the inverter compressor operates at minimum frequency. This valve turns ON while the discharge temperature of the compressor is low. This valve turns ON during the operation of 4-way valve control.

(2) Oil Recovery Valve [ORVR]

The purpose of this valve is to recover oil from the oil separator to the compressor and is to adjust the capacity and pressure.

This valve turns ON when the oil level of the compressor is “0” or “1”.

This valve is always OFF when outdoor unit is stopped.

* For oil level of compressor, see the section “6. Oil Control”.

Current protection

This restriction protects the compressor and controls the compressor electric current simultaneously. The current limitation value changes to “normal status” and “overload status” according to the outdoor temperature. The primary and secondary current values of the inverter compressors are measured.

unit: Ampere

Primary

Secondary

Type of outdoor unit 8HP 10HP

Limit current 1 15.4 21.4 Maximum current 1 H 12.4 18.4 Maximum current 1 L 11.4 17.4

Common 8HP and 10HP (1) (2) (3)

Limit current 2 24.3 24.3 24.3 Maximum current 2 H 21.8 20.0 18.0 Maximum current 2 L 20.8 19.0 17.0

Mini VRF SYSTEM

Control Functions - Outdoor unit

Outdoor air temperature

Over 40 °C

Over 36 °C

(3)

(2)

(1)

Less than 39 °C

Less than 35 °C

Limit current 1, 2

Max. current 1H, 2H

Max. current 1L, 2L

Inverter layout

Power

supply

Stop If this current is detected at regular intervals, alarm appears.

Frequency of inverter compressor goes down.

Frequency of inverter compressor cannot increase.

Frequency of inverter compressor can increase.

FuseFuse

Noise filter

Fuse

Noise filter

Primary CT1

Reactor

Diode bridge

IPM

(CM1)

Fuse

Secondary CT

Compressor

Fan motor 1

Fan motor 2

1 - 8

Page 19

3. Special Control

4. Special Control

2WAY VRF SYSTEM

Control Functions

Mini VRF SYSTEM

Control Functions - Outdoor unit

Items Remarks Indication on PCB

Solenoid valve

Motor Operated Valve

Crankcase heater

(1) 4-way Valve [20S]

This valve turns OFF at cooling mode, and turns ON at heating mode. Regarding the operation in defrost mode, see the section "8. Defrost Control". When the outdoor unit stops, the 4-way valve maintains in the same state as before.

(2) Oil Recovery Valve [ORVR]

The purpose of this valve is to recover oil from the oil separator to the compressor and is to adjust the capacity and pressure.

This valve is always OFF when outdoor unit is stopped.

This valve turns ON when the oil level of the compressor is “0” or “1”.

* For oil level of compressor, see the section “6. Oil Control”.

This valve turns ON for 5 seconds before the inverter compressor starts. After the inverter compressor starts, the valve is ON for 2 minutes. After that, it turns OFF.

4-way valve

Oil recovery valve

2 valve

MOV for heat exchanger 1

MOV for heat exchanger 2

Crankcase heater

5 seconds 2 minutes

20S

ORVR

MOV1

MOV2

SAVE valve

Compressor

Inverter compressor starts

Valve turns ON

Valve turns OFF

α β

Standard

setting

3.42

3.32

MPa

Renewal

setting

3.00

2.90

1 - 9

Page 20

3. Special Control

2WAY VRF SYSTEM

Control Functions

4. Special Control

5. Outdoor Unit Fan Control

2WAY VRF SYSTEM

Control Functions

(1) Number of Fan Motor

These outdoor units utilize a DC fan motor that can be controlled in 0〜15 steps (0〜15 modes) in ordinary mode. The control range is expanded to a maximum of 15 steps (15 modes) if high static-pressure mode has been set. The fan rotating numbers will be changed according to the fan steps.

(2) Fan Step

3-1. Maximum rotation number of fan

3-2. Minimum rotation number of fan

Maximum rotation number of fan is limited regardless of the fan step as shown below.

Minimum rotation number in fan step is limited by the secondary current value and ambient temperature as shown in the table below. A mode that has higher number of revolutions than that written in the table below becomes the minimum fan step. The rotation number of fan can be taken priority rather than silent mode.

Ambient temperature (AT)

(3) Minimum Fan Step and Maximam Fan Step

AT < 0°C 40°C ≤ AT

SC > 17.0A

Secondary

Current

(SC)

0°C ≤ AT

< 10°C

12.0A < SC ≤ 17.0A

7.0A < SC ≤ 12.0A

SC ≤ 7.0A

350rpm

250rpm

160rpm

0rpm

450rpm

350rpm

160rpm

0rpm

550rpm

400rpm

250rpm

100rpm

650rpm

500rpm

250rpm

140rpm

700rpm

600rpm

350rpm

150rpm

800rpm

700rpm

400rpm

150rpm

10°C ≤ AT

< 20°C

20°C ≤ AT

< 30°C

30°C ≤ AT

< 40°C

Type of outdoor unit Number of fan motor

8･10HP

Type of outdoor unit

8・10HP

Cooling mode

Heating mode

8HP 10HP

850rpm (step14) 900rpm (step15)

800rpm (step13) 850rpm (step14)

Mini VRF SYSTEM

Control Functions - Outdoor unit

(3) O2 Valve [O2] *O2 valve is the local supply parts.

This valve works when the outdoor unit receives signal of the refrigerant leakage from the indoor unit. The indoor unit that transmits the signal of the refrigerant leakage gives “P14”alarm. To activate this function, it is necessary to set it to EEPROM on the main outdoor PCB and indoor PCB.

EEPROM setting in main outdoor unit CODE: C1

(4) Electronic Control Valves [MOV1, MOV2]

4-1. Type of Electronic control valves

Setting No.

0 1

EEPROM setting in indoor unit CODE: 0B

Both MOV1 and MOV2 are controlled by the same pulse.

Setting No.

0 1

This function invalid (factory preset mode) This valve is turned OFF when the system is normal. This valve is turned ON when the outdoor unit receives signal from the indoor unit This valve is turned ON when the system is normal. This valve is turned OFF when the outdoor unit receives signal from the indoor unit This valve is turned OFF when the system is normal.

This valve is turned ON and performs pump down control when the outdoor unit receives signal from the indoor unit. It is necessary to install the external refrigerant recovery circuit in order to make this setting. (field supply)

Function of EXCT plug short-circuit Indoor unit does thermostat OFF Indoor unit gives “P14”alarm and transmits the refrigerant leakage signal.

(factory preset mode)

4-2. Power Initialization

If no indoor units have started (even once) after the power supply to the outdoor unit, the MOV holds the 480 pulses (fully open).

*When the indoor unit receives the signal for operation request from the control equipment, the pulse turns

other than the 480 pulses (regardless of the thermostat ON/OFF or operating ON/OFF). It is necessary to switch ON the power supply again if the 480 pulses are required.

4-3. Control of Electronic control valves

(5) Crankcase Heater Control [CH]

Electronic control valves for heat exchanger control according to the operation mode.

MOV1 and MOV2 (pulse)

*1 However, 100 pulses remain for 2 minutes after unit stopped.

*2 When the outdoor unit stops and low pressure ≤ 0.16 MPa, 60 pulses remain for 30 seconds. *3 If any one compressor in the outdoor unit is operating in heating mode, electronic control valves perform SH

control. SH control adjusts the difference of temperature between the liquid and gas temperature to -1 ~ 5 degrees Celsius.

When the compressor stops, the crankcase heater of its own compressor is turned ON / OFF in the following conditions.

●

When the outdoor air temperature < 25°C :ON

●

When the outdoor air temperature ≥ 27°C : OFF

Compressor

Stop

Cooling HeatingMode of system

Operation

480

Stop

Operation

0 ~ 480*

1 - 10

Page 21

4. Outdoor Unit Fan Control

5. Outdoor Unit Fan Control

2WAY VRF SYSTEM

Control Functions

Mini VRF SYSTEM

Control Functions - Outdoor unit

(1) Number of Fan Motor

Type of outdoor unit Number of fan motor

(2) Fan Step

(3) Minimum Fan Step and Maximam Fan Step

3-1. Maximum rotation number of fan

Maximum rotation number of fan is limited regardless of the fan step as shown below.

Type of outdoor unit

Cooling mode

Heating mode

3-2. Minimum rotation number of fan

8･10HP

8HP 10HP 800rpm (step13) 850rpm (step14)

850rpm (step14) 900rpm (step15)

Secondary

Current

(SC)

8・10HP

SC > 17.0A

12.0A < SC ≤ 17.0A

7.0A < SC ≤ 12.0A

SC ≤ 7.0A

Ambient temperature (AT)

AT < 0°C 40°C ≤ AT

350rpm

250rpm

160rpm

0rpm

0°C ≤ AT

< 10°C

450rpm

350rpm

160rpm

0rpm

10°C ≤ AT

< 20°C

550rpm

400rpm

250rpm

100rpm

20°C ≤ AT

< 30°C

650rpm

500rpm

250rpm

140rpm

30°C ≤ AT

< 40°C

700rpm

600rpm

350rpm

150rpm

800rpm

700rpm

400rpm

150rpm

1 - 11

Page 22

4. Outdoor Unit Fan Control

2WAY VRF SYSTEM

Control Functions

5. Outdoor Unit Fan Control

2WAY VRF SYSTEM

Control Functions

The system entirely becomes to the silent mode by setting in the main outdoor unit.

EEPROM setting in main outdoor unit CODE : 05

Mode

Invalidity (Factory preset mode)

Capacity is given priority

Setting No.

Capacity is given priority

Never use

Capacity is given priority

Never use

External input to PCB

Necessary

Unnecessary

Silent effect

-3dB

Necessary -5dB

-7dB

-3dB

Unnecessary -5dB

-7dB

NOTE

When the setting is “external input to PCB unnecessary”, this function always works. When the setting is “Capacity is given priority”, this function is interrupted in the following conditions.

Cooling operation: Ambient temperature ≥ 38°C Heating operation: Ambient temperature < 2°C

Silent is given priority9

Silent is given priority

Never use

Silent is given priority

Never use

Necessary

Unnecessary

-3dB

Necessary -5dB

-7dB

-3dB

Unnecessary -5dB

-7dB

CODE: 78

Input by indoor unit remote controller

Invalid (Factory preset mode)

Valid

Setting No.

When the setting is “external input necessary”, this function works in either of the following way

short circuiting "SILENT” plug on the PCB.

-1 Change setting the outdoor unit EEPROM CODE: 78 to "01".

-2 When setting in Quiet operation by the indoor unit address 1 remote controller (CZ-RTC5):

*Regarding the method of setting Quiet operation, see the Operating Instructions provided with the remote controller.

Mini VRF SYSTEM

Control Functions - Outdoor unit

(4) Fixed Initial Fan Step

For the first 30 seconds after operation starts, the spep is fixed at the initial mode which was calculated from the relationship between the outdoor air temperature and the outdoor unit horsepower. If the outdoor unit horsepower (compressor capacity) changes dramatically, the initial mode may be recalculated and may be again fixed for 30 seconds.

(5) Operation after Fixed Initial Fan Step

After the fixed initial fan step, the fan step is increased or decreased according to the operating conditions.

5-1. Cooling operation

Fan step is increased when the detected high pressure saturated temperature is high, and is decreased when the high pressure saturated temperature is low. * The fan step is always increased when the detected high pressure sensor temperature is 46°C or higher. The fan step may be decreased when the system detects refrigerant shortage at an indoor unit.

During cooling operation, if the fan step becomes “0” and this condition maintains for 3 minutes, the fan step is changed to “1”.

5-2. When all indoor units are operating in heating mode

If the pressure sensor temperature is low, the fan step is increased at regular intervals.

If the pressure sensor temperature is high, the fan step is decreased in order to prevent excessive loads.

The fan step may be increased when the liquid temperature of outdoor unit heat exchanger drops to 1 degrees Celsius or below.

(6) Silent Mode

Selecting the silent mode results in operation that gives priority to reducing noise at the outdoor unit. When the setting is in silent mode, the outdoor fan step and the maximum frequency is limited. So the capacity will be decreased. However, the frequency is not limited during the special controls.

Maximum fan step & maximum frequency in silent mode

Type of outdoor unit

-3dB mode

-5dB mode

-7dB mode

Fan step

Compressor frequency (Hz)

Fan step

Compressor frequency (Hz)

Fan step

Compressor frequency (Hz)

Silent effect

Cooling

64.5

59.4

54.4

8HP

Heating

12 11 1310

69.5

67.8

Cooling

10HP

69.5

64.5

59.4

Heating

74.5

69.5

1 - 12

Page 23

4. Outdoor Unit Fan Control

5. Outdoor Unit Fan Control

2WAY VRF SYSTEM

Control Functions

Mini VRF SYSTEM

Control Functions - Outdoor unit

The system entirely becomes to the silent mode by setting in the main outdoor unit.

EEPROM setting in main outdoor unit CODE : 05

Setting No.

Mode

Invalidity (Factory preset mode)

Capacity is given priority

Never use

Capacity is given priority

Never use

Silent is given priority9

Silent is given priority

External input to PCB

Necessary

Necessary -5dB

Necessary

Unnecessary

Unnecessary -5dB

Unnecessary

Necessary

Necessary -5dB

Necessary

Silent effect

-3dB

-7dB

-3dB

-7dB

-3dB

-7dB

NOTE

When the setting is “external input necessary”, this function works in either of the following way

short circuiting "SILENT” plug on the PCB.

-1 Change setting the outdoor unit EEPROM CODE: 78 to "01".

CODE: 78

Setting No.

-2 When setting in Quiet operation by the indoor unit address 1 remote controller (CZ-RTC5):

*Regarding the method of setting Quiet operation, see the Operating Instructions provided with the remote controller.

Cooling operation: Ambient temperature ≥ 38°C Heating operation: Ambient temperature < 2°C

Input by indoor unit remote controller

Never use

Silent is given priority

Never use

Invalid (Factory preset mode)

Valid

Unnecessary

Unnecessary -5dB

Unnecessary

-3dB

-7dB

1 - 13

Page 24

5. Outdoor Unit CCU (command controller

6. Outdoor Unit CCU (command controller unit) Control

2WAY VRF SYSTEM

Control Functions

2WAY VRF SYSTEM

Control Functions

6. Outdoor Unit CCU (command controller unit) Control

Operating

mode of

indoor unit

Operating

mode of

outdoor unit

Operating

mode of

compressor

Thermostat

ON/OFF

MOV pulse of indoor unit

Stop

Cooling

Stop

Operation

Stop

Operation

Stop

Operation

Stop

OFF

Operation

60 ~ 480 (SH control*

)

65 - 480 pulses (SC control*

)

Operation

Fan (only)

Cooling

Heating

Cooling

Heating

1-2. Indoor unit with RAP valve kit

Go to previous page and see the comments with asterisks *1 and *3. In the case of special controls, the MOV performs a special operation. For details, see “3. Special Control” under this section.

unit : pulse

unit) Control

Mini VRF SYSTEM

Control Functions - Outdoor unit

Some actuators of indoor unit are controlled by CCU.

(1)

MOV of Indoor Unit

1-1. Indoor unit without RAP valve kit

Operating

mode of

indoor unit

Stop

Fan (only)

Cooling

Heating

*1 SH control adjusts the difference between the liquid temperature and gas temperature in indoor unit.

SH = gas temperature (E3) - liquid temperature (E1) Target SH is 3 degrees Celsius when the load level of indoor unit is “30” or “31 (test run)”. Target SH will be increased up to 17.5 degrees Celsius when the load level of indoor unit is low.

When the refrigerant amount in the system is adjusted, it is necessary to select test run mode that the required level becomes “31”.

*2 MOV pulse changes to 55 for 1 minute when the MOV pulse continues to be 55 or more for 10 minutes.

The purpose of this control is to decrease the flow volume of the refrigerant so that room temperature can be detected with less influence of heat from the refrigerant.

*3 SC control adjusts the difference in temperature between the liquid temperature in indoor unit and

high-pressure saturated temperature in outdoor unit. SC = high-pressure sensor temperature (HPS) - liquid temperature (E1) Target SC is 5 - 15 degrees Celsius according to the operating condition.

Operating

mode of

outdoor unit

Cooling

Heating

Cooling

Heating

Cooling

Heating

Operating

mode of

compressor

Stop

Operation

Stop

Operation

Stop

Operation

Stop

Operation

Stop

Operation

Stop

Operation

Thermostat

ON/OFF

OFF

65 ~ 80 (prevent remaining refrigerant )

65 ~ 80 (prevent remaining refrigerant)

60 ~ 480 (SH control*

55 ~ 80 (prevent remaining refrigerant, suction temperature control*

65 - 480 pulses (SC control*

MOV pulse of indoor unit

)

unit : pulse

1 - 14

Page 25

5. Outdoor Unit CCU (command controller

2WAY VRF SYSTEM

Control Functions

6. Outdoor Unit CCU (command controller unit) Control

unit) Control

Mini VRF SYSTEM

Control Functions - Outdoor unit

1-2. Indoor unit with RAP valve kit

Operating

mode of

indoor unit

Stop

Fan (only)

Cooling

Heating

Go to previous page and see the comments with asterisks *1 and *3. In the case of special controls, the MOV performs a special operation. For details, see “3. Special Control” under this section.

Operating

mode of

outdoor unit

Cooling

Heating

Cooling

Heating

Cooling

Heating

Operating

mode of

compressor

Stop

Operation

Stop

Operation

Stop

Operation

Stop

Operation

Stop

Operation

Stop

Operation

Thermostat

ON/OFF

OFF

60 ~ 480 (SH control*

20 65 - 480 pulses (SC control*

MOV pulse of indoor unit

)

unit : pulse

1 - 15

Page 26

5. Outdoor Unit CCU (command controller

6. Outdoor Unit CCU (command controller unit) Control

2WAY VRF SYSTEM

Control Functions

2WAY VRF SYSTEM

Control Functions

6. Outdoor Unit CCU (command controller unit) Control

3-2. Heating mode

The indoor unit fan in heating mode is stopped from the CCU in the following condition.

Discharge air temperature of indoor unit ≤ 20°C High pressure saturated temperature (HPT) in outdoor unit≤ 25°C

Liquid temperature (E1) in indoor unit ≤ 20°C

EEPROM setting in main outdoor unit CODE: 0C

Indoor unit

operation mode

Setting No.

7 (Factory

preset mode)

Movement of drain pump

Invalid

DP operates for 20 minutes and stops for 2 hours

DP operates for 20 minutes and stops for 20 minutes

DP always operates

DP operates for XX minutes when indoor unit's operation changes; from thermostat ON or thermostat OFF → operation stopped.

DP operates for XX minutes when indoor unit's operation changes; from thermostat ON → thermostat OFF or operation stopped.

All mode

Cooling mode Dry mode Heating mode

Cooling mode Dry mode

Both Setting No. 4 and 5 functions.

DP operates for XX minutes when indoor unit's operation changes from thermostat ON or thermostat OFF → operation stopped.

(4) Drain Pump Control

The CCU intervenes in drain pump control of the indoor unit according to the setting in EEPROM in the outdoor unit. The drain pump operates from the CCU control at the following condition.

DP counter ≥ 5

*The DP counter counts each oil recovery control, and 4-way Valve Adjustment Control in cooling operation.

Liquid temperature (E1) in the indoor unit which selected cooling mode < 0 °C

* Regardless of operating / stopped mode

To activate this function, it is necessary to set EEPROM on the main outdoor unit PCB.

When any of setting Nos. 4 – 7 is selected, this function works only for the type of F2, M1, E2.

Low Silhouette Ducted type indoor unit

In Low Silhouette Ducted types, dirt might be accumulated when water collects in the drain pan for a long term. Therefore, the drain pump works longer to drain water surely.

unit) Control

Mini VRF SYSTEM

Control Functions - Outdoor unit

(2) RAP Valve Kit

(3) Indoor Fan Speed Control

Operating

mode of

indoor unit

Stop

Fan (only)

Cooling

Heating

RAP valve kit state (ON/OFF) is displayed on "D" in DSBE column when the Checker software is used. 0：OFF 1：ON In the case of special controls, the MOV performs a special operation. For details, see “3. Special Control” under this section.

The CCU intervenes in fan control of the indoor unit according to the status of the operating mode. The priority order of fan control by the CCU is higher than that of indoor units.

Operating

mode of

outdoor unit

Cooling

Heating

Cooling

Heating

Cooling

Heating

Operating

mode of

Compressor

Stop

Operation

Stop

Operation

Stop

Operation

Stop

Operation

Stop

Operation

Stop

Operation

Thermostat

ON/OFF

OFF

RAP valve kit

ON/OFF

OFF

3-1. Dry mode

Indoor unit fan operated in the dry mode is controlled from the CCU as shown in the figure below.

+ 1.0 degrees Celsius

* DTi = ( Air intake temperature of indoor unit) - (Preset temperature by remote controller)

DTi

Preset fan speed by remote controller

Fan speed

In the case of thermostat ON : “L” In the case of thermostat OFF : “LL”

1 - 16

Page 27

5. Outdoor Unit CCU (command controller

2WAY VRF SYSTEM

Control Functions

6. Outdoor Unit CCU (command controller unit) Control

unit) Control

Mini VRF SYSTEM

Control Functions - Outdoor unit

3-2. Heating mode

The indoor unit fan in heating mode is stopped from the CCU in the following condition.

(4) Drain Pump Control

Discharge air temperature of indoor unit ≤ 20°C High pressure saturated temperature (HPT) in outdoor unit≤ 25°C

Liquid temperature (E1) in indoor unit ≤ 20°C

The CCU intervenes in drain pump control of the indoor unit according to the setting in EEPROM in the outdoor unit. The drain pump operates from the CCU control at the following condition.

DP counter ≥ 5

*The DP counter counts each oil recovery control, and 4-way Valve Adjustment Control in cooling operation.

Liquid temperature (E1) in the indoor unit which selected cooling mode < 0 °C

* Regardless of operating / stopped mode

Low Silhouette Ducted type indoor unit

In Low Silhouette Ducted types, dirt might be accumulated when water collects in the drain pan for a long term. Therefore, the drain pump works longer to drain water surely.

To activate this function, it is necessary to set EEPROM on the main outdoor unit PCB.

EEPROM setting in main outdoor unit CODE: 0C

Setting No.

Invalid

Movement of drain pump

Indoor unit

operation mode

7 (Factory

preset mode)

When any of setting Nos. 4 – 7 is selected, this function works only for the type of F2, M1, E2.

DP operates for 20 minutes and stops for 2 hours

DP operates for 20 minutes and stops for 20 minutes

DP always operates

DP operates for XX minutes when indoor unit's operation changes; from thermostat ON → thermostat OFF or operation stopped.

DP operates for XX minutes when indoor unit's operation changes; from thermostat ON or thermostat OFF → operation stopped.

Both Setting No. 4 and 5 functions.

DP operates for XX minutes when indoor unit's operation changes from thermostat ON or thermostat OFF → operation stopped.

All mode

Cooling mode Dry mode Heating mode

Cooling mode Dry mode

1 - 17

Page 28

5. Outdoor Unit CCU (command controller

6. Outdoor Unit CCU (command controller unit) Control

2WAY VRF SYSTEM

Control Functions

2WAY VRF SYSTEM

Control Functions

7. Oil Control

(1) Oil Level

(2) Oil Level Detection

Conditions of oil level in compressor JudgmentOil level

State

Sufficient

Possibility of

shortage

Shortage

The compressor contains sufficient oil. There is no problem.

There will be a risk of oil shortage soon.

Confirm that oil is improved after performing the oil recovery control operation.

The compressor oil is short against required level for normal operation.

Confirm that oil level is improved after performing the oil recovery control among systems.

At the time immediately after the oil level changes from 2 to 1, there is a specified amount of oil in the compressor. Namely, soon after the oil level is changed from 1 to 2, the oil in the compressor is sufficient. After about 1-hour operation, if the oil level “0” indication continues for more than 5 to 10 minutes, it seems to come short of oil in the system. Check valves related to oil recovery operation, the refrigerant tubing and for any oil leakage.

The compressor oil in the crankcase is sent by bypass via a capillary tube to the low-pressure circuit. The temperature detected by an oil sensor is used to determine whether it is oil (warm) or refrigerant (cold).

(3) Self-separator Oil Recovery Control

When a low oil level (1 or 0) is detected, oil is recovered from the oil separator to the compressor through the ORVR.

(4)

4-1.

System Oil Recovery Control

The system oil recovery control is performed by operating all the systems.

Start of system oil recovery control

When the oil level of compressors is “0”, the system oil recovery control will start. When the accumulated time reaches 60 minutes under the condition of oil level “1” or lower, the system oil recovery control will start. This timer will be cleared when the oil level “2” continues for 5 minutes.

unit) Control

Operating time “XX” under the section “(4) Drain Pump Control” described on previous page is able to set

in EEPROM of the main outdoor unit.

EEPROM setting in main outdoor unit CODE: 2B

Setting No.

* *

In the above 2 cases, the drain pump operates by the signal of indoor PCB, not by the CCU.

50 50 (minutes)

The drain pump always operates when the indoor unit is thermostat ON in cooling operation. Once the drain pump operates, it keeps operating for 20 minutes.

(factory preset mode)

20 (minutes)

30 (minutes)

40 (minutes)

60 (minutes)

Control Functions - Outdoor unit

Mini VRF SYSTEM

(5) Discharge Air Temperature Control

For Type F2, M1 and E2 indoor units, discharge air temperature is controlled from the CCU to prevent dew condensation on duct surface in cooling operation. The CCU monitors and adjusts ∆To of indoor unit. The adjustment is made by compressor capacity and MOV operation in the indoor unit.

∆To : Cooling (Discharge air temperature) - (Preset discharge air temperature)

Situation in which indoor unit thermostat OFF by discharge air temperature control

EEPROM setting in main outdoor unit CODE: E1

Heating (Preset discharge air temperature) - (Discharge air temperature)

∆To ≤ - 3.5 degrees Celsius, and this condition continues for 7 minutes ∆To < - 2.0 degrees Celsius, and this condition continues for (20 + XX) minutes

The above mentioned “XX” is able to set in EEPROM of the main outdoor unit.

Setting No.

-20

-19

-18

...

-20 (minutes)

-19 (minutes)

-18 (minutes)

...

Regarding the preset discharge air temperature that is set in the indoor unit is able to change, see the section “5. REMOTE CONTROLLER FUNCTIONS” in this Service Manual.

0 (minutes)

(factory preset mode)

...

10 (minutes)

1 - 18

Page 29

6. Oil Control

2WAY VRF SYSTEM

Control Functions

7. Oil Control

Mini VRF SYSTEM

Control Functions - Outdoor unit

(1) Oil Level

(2) Oil Level Detection

(3) Self-separator Oil Recovery Control

When a low oil level (1 or 0) is detected, oil is recovered from the oil separator to the compressor through the ORVR.

State

Sufficient

Possibility of

shortage

Shortage

Conditions of oil level in compressor JudgmentOil level

The compressor contains sufficient oil. There is no problem.

There will be a risk of oil shortage soon.

The compressor oil is short against required level for normal operation.

Confirm that oil is improved after performing the oil recovery control operation.

Confirm that oil level is improved after performing the oil recovery control among systems.

(4)

System Oil Recovery Control

The system oil recovery control is performed by operating all the systems.

4-1.

Start of system oil recovery control

1 - 19

Page 30

6. Oil Control

2WAY VRF SYSTEM

Control Functions

7. Oil Control

8. 4-Way Valve Adjustment Control

2WAY VRF SYSTEM

Control Functions

The first operation after turning on power supply to outdoor unit.

The mode of the system changes.

The purpose of this control is to change over the 4-way valve appropriately with big pressure difference. This control is performed at the following conditions.

Cooling operation

*When the above operation is finished, normal operation starts at the horsepower determined by the indoor units

where thermostats are ON.

*When the above operation is finished, normal operation starts at the horsepower determined by the indoor units

where thermostats are ON.

The first operation after all outdoor units stopped for 60 minutes.

For 60 seconds

Indoor units

Control time

Outdoor units

MOV

RAP valve kit

Fan

All outdoor units operate at the maximum capacity.

MOV at all indoor units operate at a fixed pulse according to the indoor unit capacity.

All indoor units operate in Cooling mode (OFF status).

Fan rotates at the set fan speed depending on the indoor unit operation mode or at fan speed “LL”.

Minimum 1 min - Maximum 20 min [until max. (pressure sensor temp.) 35°C]

Indoor units

Control time

Outdoor units

MOV

RAP valve kit

Fan

All outdoor units operate at the maximum capacity.

MOV at all indoor units initially operates 250 pulses and then runs in SC control mode.

All indoor units operate in heating mode (ON status).

Fan rotates at the set fan speed depending on the indoor unit operation mode or at “LL” fan speed, or stops.

Heating operation

4-2.

Simplified flow of system oil recovery control

The system oil recovery control shall be performed as the flow mentioned below. Normal operation → System oil recovery control → Normal operation

In the case of cooling mode

Indoor units

In the case of heating mode

Indoor units

Control time

Outdoor units

RAP valve kit

Control time

RAP valve kit

MOV

Fan

MOV

For max 5 minutes

All outdoor units operate at maximum horsepower.

MOV at all indoor units operate at a fixed pulse according to the indoor unit capacity.

All indoor units operate in Cooling mode (OFF status).

Fan rotates at the set fan speed depending on the indoor unit operation mode or at fan speed “LL”.

For 2 minutes

All outdoor units operate at more than half horsepower.

MOV at all indoor units operate at 250 pulses.

All indoor units operate in Heating mode (ON status.)

Control Functions - Outdoor unit

Mini VRF SYSTEM

(5) Indoor Unit Self Oil Recovery Control

This control is carried out regularly when the system is in cooling mode.

During stopped, fan mode setting or thermostat OFF condition at the indoor unit, MOV of the indoor unit is opened regularly for 1 minute (at the interval of approximately 40 minutes).

During the thermostat ON, MOV of the indoor unit is opened 20 pulses from the current status.

Type of

indoor unit

D1, K1, K2

Except

D1, K1, K2

of indoor unit

For

Fan

Operating

mode

Stop

Fan

Cooling

Stop

Fan

Cooling

Fan rotates at the set fan speed depending on the indoor unit operation mode or at fan speed “LL”.

EEPROM setting in main outdoor unit CODE: 24

Thermostat

ON/OFF

OFF

Pulse of MOV

80 – 160

80 - 160

80 – 160

Present pulse+20

80 – 160

Present pulse+20

Setting No. 0

Fan speed

Stop

Set speed

Stop

Set speed

Flap

Setting No. 1

Fan speed

Set speed

Stop

Set speed

Open

Flap

* MOV pulse might be different from the table listed above depending on the use conditions.

1 - 20

Page 31

7. 4-Way Valve Adjustment Control

8. 4-Way Valve Adjustment Control

2WAY VRF SYSTEM

Control Functions

Mini VRF SYSTEM

Control Functions - Outdoor unit

The purpose of this control is to change over the 4-way valve appropriately with big pressure difference. This control is performed at the following conditions.

The first operation after turning on power supply to outdoor unit. The first operation after all outdoor units stopped for 60 minutes.

The mode of the system changes.

Cooling operation

Control time

Outdoor units

MOV

Indoor units

*When the above operation is finished, normal operation starts at the horsepower determined by the indoor units

where thermostats are ON.

Heating operation

Control time

Outdoor units

RAP valve kit

Fan

Minimum 1 min - Maximum 20 min [until max. (pressure sensor temp.) 35°C]

All outdoor units operate at the maximum capacity.

For 60 seconds

All outdoor units operate at the maximum capacity.

MOV at all indoor units operate at a fixed pulse according to the indoor unit capacity.

All indoor units operate in Cooling mode (OFF status).

Fan rotates at the set fan speed depending on the indoor unit operation mode or at fan speed “LL”.

MOV

RAP valve kit

Indoor units

Fan

*When the above operation is finished, normal operation starts at the horsepower determined by the indoor units

where thermostats are ON.

MOV at all indoor units initially operates 250 pulses and then runs in SC control mode.

All indoor units operate in heating mode (ON status).

Fan rotates at the set fan speed depending on the indoor unit operation mode or at “LL” fan speed, or stops.

1 - 21

Page 32

8. Defrost Control

2WAY VRF SYSTEM

Control Functions

9. Defrost Control

2WAY VRF SYSTEM

Control Functions

(4)

When the heating operation time at system has exceeded “XX” minutes (35 minutes at initial setting), and at least one unit satisfies the decision of defrosting, the defrosting operation is effective.

9. Defrost Control

Heating Operation Set Time (Defrosting Operation Prohibiting Time)

(5)

Defrost ends when either of the below defrost end judgment conditions is met.

Defrost End Judgment Conditions

(6)

If there is only 1 outdoor unit in the refrigerant system, a reverse cycle defrost will be carried out.

It is possible to change the stopped time according to the setting. For the maximum defrost time, see the table shown above.

Reverse Cycle Defrost

* XX is able to set in EEPROM of main outdoor unit.

* Defrost control is also performed at outdoor units where the outdoor unit heat exchanger is not functioning as

an evaporator (such as stopped outdoor units).

EEPROM setting in main outdoor unit CODE: A3

Setting No.

...

0 (minutes)

35 (minutes)

(factory preset code)

1 (minutes)

...

60 (minutes)

Condition 1: The temperatures are 15°C or higher at all heat exchanger sensors installed on the outdoor

unit. One minute has elapsed under the condition that the temperatures are 10°C or higher at all heat exchanger sensors installed in the outdoor unit.

Condition 3:

Condition 2:

13 minutes have elapsed.

Defrost flow E:C:Evaporator operation

Condenser operation E → C: C → E:

Switching evaporator operation to condenser operation Switching condenser operation to evaporator operation

Indoor unit

Cooling mode

Heating mode

Defrost

preparation

Defrost in

progress

Defrost

end

judgment

Defrost end

Thermostat ON EC→E E → C Thermostat OFF EC→E

E → C

Thermostat ON EC→E E → C

Fan (only) EC→E

E → C

Thermostat OFFEC→E

E → C

Compressor OperatingStopped Stopped

4-way valve OFFON→OFF OFF→ON

Stopped EC→E

E → C

Outdoor unit status C

E → CC → E

TimeMaximum 13 minutes1 minute 1 minute

Mini VRF SYSTEM

Control Functions - Outdoor unit

(1) Type of Defrost Control

This system uses the reverse cycle defrost.

(2) Forced Conditions

Defrost does not begin again for 35 minutes of operation after defrost was once completed. If the outdoor unit is stopped while defrosting due to protection control or another reason, then defrost control will not start for a minimum of 10 minutes after restart occurs.

Even if all indoor units are stopped while defrosting, defrost control continues until it ends.

(3) Frost Detection

Frost detection does not occur for 5 minutes after operation starts.

Frost is detected when minimum heat exchanger temperature meets any one of the condition 1 - 3 below.

Condition 1: Minimum heat exchanger temperature drops below L2 line shown in the figure below and detects

Condition 2:

Condition 3: Minimum heat exchanger temperature drops below -3°C and detects for a total of 90 minutes

twice for 4 minutes without interruption while the compressor is operating.

Minimum heat exchanger temperature drops below L1 line shown in the figure below and detects for a total of 60 minutes while the compressor is operating.

while the compressor is operating.

Minimum heat exchanger temperature °C

15 (Defrosting operation-end temperature)

unit: °C

-25

-1

-3

-8

-10

Frost detection area below the bold lines L1 and L2

-25.5

-27.5

L1 L2

Ambient temperature°C

1 - 22

Page 33

Mini VRF SYSTEM

2WAY VRF SYSTEM

Control Functions

9. Defrost Control

8. Defrost Control

(4)

Heating Operation Set Time (Defrosting Operation Prohibiting Time)

* XX is able to set in EEPROM of main outdoor unit.

EEPROM setting in main outdoor unit CODE: A3

Setting No.

Control Functions - Outdoor unit

...

0 (minutes)

1 (minutes)

...

35 (minutes)

(factory preset code)

...

60 (minutes)

* Defrost control is also performed at outdoor units where the outdoor unit heat exchanger is not functioning as

an evaporator (such as stopped outdoor units).

(5)

Defrost End Judgment Conditions

Defrost ends when either of the below defrost end judgment conditions is met.

Condition 1: The temperatures are 15°C or higher at all heat exchanger sensors installed on the outdoor

unit.

Condition 2:

One minute has elapsed under the condition that the temperatures are 10°C or higher at all heat exchanger sensors installed in the outdoor unit.

Condition 3:

(6)

Reverse Cycle Defrost

13 minutes have elapsed.

If there is only 1 outdoor unit in the refrigerant system, a reverse cycle defrost will be carried out.

Defrost flow E:C:Evaporator operation

Condenser operation

Indoor unit

E → C: C → E:

Outdoor unit status C

Compressor OperatingStopped Stopped 4-way valve OFFON→OFF OFF→ON

Cooling mode

Heating mode

Switching evaporator operation to condenser operation Switching condenser operation to evaporator operation

Defrost

preparation

E →

Stopped EC→E

Fan (only) EC→E

Thermostat ON EC→E E → C Thermostat OFFEC→E Thermostat ON EC→E E → C Thermostat OFF EC→E

TimeMaximum 13 minutes1 minute 1 minute

Defrost in

progress

judgment

Defrost

end

Defrost end

→ E

E → C E → C

E → C

It is possible to change the stopped time according to the setting. For the maximum defrost time, see the table shown above.

1 - 23

Page 34

9. Demand Control

2WAY VRF SYSTEM

Control Functions

10. Demand Control

2WAY SYSTEM

Control Functions-Outdoor Unit

10. Upper Current Limitation Mode

EEPROM setting in main outdoor unit

CODE: 1A

CODE: 1E

Setting No.

0 No display 1 2

Information is displayed when input of demand control is set (factory preset mode). Information is displayed only when the capacity is restricted by demand control.

Control

Contact 1

Upper current limitation setting

Contact 2

No control (Operates to maximum capacity)

Operates to XX% of the upper limit for the rated current.

Operates to YY% of the upper limit for the rated current.

Forced thermostat OFF setting

Serial-parallel I/O must be connected in order to perform demand control. The below input is received by serial-parallel I/O, and demand control is performed.

The demand values can be set as needed with serial-parallel I/O.

It is able to display the present condition on the remote controller.

* The rated current indicates the current value that is listed in the catalog or similar material.

* XX and YY are able to set in EEPROM of main outdoor unit.

: Input present : Input not present

(3) Serial-parallel I/O

CODE: 1B

Setting No.

0 40 45

-1

130

0 40 45

No control

130

Setting No.

0 40 45

-1

130

100

No control

130

Interval of “5”

40 45

100 (factory preset mode)

Interval of “5”

70 (factory preset mode)

NOTE

Since the pattern “A” and “B” perform the outdoor unit current demand control (compressor’s suppressive drive), it is easy to grasp energy saving amount. However, it may cause the reduction of capacity in all indoor units of the same refrigerant system. In order to make the indoor unit (group) only valid as the energy saving function where the Energy Saving button is pressed and not to influence to other indoor units, be sure to set the outdoor unit EEPROM setting DN18 to “1” and DN19 to “0”.

Mini VRF SYSTEM

Control Functions - Outdoor unit

(1)

Usual Demand Control

Demand control is performed to suppress the horsepower not to make the primary current exceed the setting value. The standard value of the limit current is shown in the table below.

Type of outdoor unit 10HP unit:Amp.

Cooling mode

(2)

Heating mode

The system current value is controlled at rated current value without demand input as shown in the table below.

Energy Saving Button (CZ-RTC5)

When the Energy Saving button of the indoor unit remote controller is pressed, demand control is performed according to EEPROM : 1A values. Setting of Energy Saving button: Outdoor unit EEPROM Setting item DN18, DN19

Energy saving operation when the Energy Saving button is pressed provides 3 patterns of control. Patterns: A.

B. C.

Outdoor unit EEPROM setting (DN18) : The marking “” indicated in the following table is applicable to the function of control.

Type of outdoor unit 10HP

Limited ratio against standard value

Limit value

Demand control is performed under the current limitation values set at the outdoor unit EEPROM setting (DN1A). In addition, the indoor unit controls the limitation of discharge temperature.

Demand control is performed under the current limitation values set at the outdoor unit EEPROM setting (DN1A). Discharge temperature limitation control is performed set at the indoor unit EEPROM setting.

Setting No.

(Factory preset mode)

Cooling mode

Heating mode

2 Pattern “B” only demand control

8HP

9.6

10.2

HP=Horsepower

Discharge

temperature

control

14.7

11.6

8HP

130%

12.4

13.2

HP=Horsepower

130%

19.2

15.0

Demand

control

unit:Amp.

No controls

Pattern “C” only discharge temperature

Pattern “A” demand control + discharge temp. control

Remarks

Outdoor unit EEPROM setting (DN19): Setting of control validity range when pressing the Energy Saving button

Setting No.

(Factory preset mode)

*When the pattern “A” and “B” are selected, energy saving control becomes valid in the same range as the

setting “1” although the Setting No. is set to “0”.

Energy saving activates where Energy Saving button is pressed as a unit of indoor unit (group).

Energy saving activates where Energy Saving button is pressed as a unit of indoor unit including all refrigerant system.

1 - 24

Control range

Page 35

Mini VRF SYSTEM

2WAY SYSTEM

Control Functions-Outdoor Unit

10. Upper Current Limitation Mode

9. Demand Control

Control Functions - Outdoor unit

NOTE

(3) Serial-parallel I/O

Serial-parallel I/O must be connected in order to perform demand control. The below input is received by serial-parallel I/O, and demand control is performed.

The demand values can be set as needed with serial-parallel I/O.

Upper current limitation setting

Contact 1

: Input present : Input not present

* The rated current indicates the current value that is listed in the catalog or similar material.

* XX and YY are able to set in EEPROM of main outdoor unit.

EEPROM setting in main outdoor unit

CODE: 1A

Setting No.

0 40 45

100

Contact 2

No control (Operates to maximum capacity)

Operates to XX% of the upper limit for the rated current.

Operates to YY% of the upper limit for the rated current.

Forced thermostat OFF setting

0 40 45

Interval of “5”

100 (factory preset mode)

Control

CODE: 1B

Setting No.

40 45

Interval of “5”

70 (factory preset mode)

0 40 45

130

-1

It is able to display the present condition on the remote controller.

EEPROM setting in main outdoor unit

CODE: 1E

Setting No.

0 No display 1 2

Information is displayed when input of demand control is set (factory preset mode). Information is displayed only when the capacity is restricted by demand control.

130

No control

1 - 25

130

-1

130

No control

Page 36

2WAY SYSTEM

Control Functions

10. Demand Control

2WAY SYSTEM

Control Functions-Outdoor Unit

10. Upper Current Limitation Mode

2WAY VRF SYSTEM

Control Functions

Case 1

→ The heating indoor units will be forced to thermostat OFF.

Number of thermostat ON indoor units in heating mode

Number of thermostat ON indoor units in cooling mode >

Case 2

→

system selects cooling mode

system selects heating mode

The cooling indoor units will be forced to thermostat OFF.

Number of thermostat ON indoor units in cooling mode <

While the system is operating, the system judges whether to switch the mode in XX minutes intervals. While the system is stopped, change the mode immediately.

12. Other Functions

EEPROM setting in main outdoor unit CODE: 27

Setting No.

Invalid

(factory preset mode)

50 50

60 60

90 90

120 120

180 180

240 240

*“XX” is able to be set in EEPROM on the outdoor unit’s PCB.

(It is impossible to perform the simultaneous cooling/heating operation.)

It is possible to select auto cooling/heating mode in each remote controller even in 2WAY VRF system. The system changes to cooling or heating operation according to number of thermostat ON mode. The system selects the mode that has more number of units with thermostat ON.

(1) Auto Cooling/Heating Function

9. Demand Control

Mini VRF SYSTEM

Control Functions - Outdoor unit

(4) When Using Demand Terminal Block

Demand terminal block must be connected in order to perform the demand control. (It is also possible to connect the optional Seri-Para I/O unit (optional CZ-CAPDC2) and setup the system.) The current limitation values can be set by changing either contact.

COM short circuit

* The rated current indicates the current value that is listed in the catalog or service manual.

**In respect of connection method for demand terminal block and Seri-Para I/O unit, refer to the installation

instructions supplied with the unit.

During setting in LV1 - LV3, [CZ-RTC4] controller of the indoor unit.

It is also possible to make setting that the display (symbol of demand-activated) is concealed as shown in the following table.

* XX and YY are able to set in EEPROM of main outdoor unit. Check " (3) Serial-parallel I/O " section.

Non

LV1

LV2

LV3

Seri-Para I/O unitDemand terminal block

Contact 1 Contact 2

No control

Operates to XX% of the upper limit for the rated current

Operates to YY% of the upper limit for the rated current

Forced thermostat OFF setting

: Input present : Input not present

Control

Operates to the maximum capacity.

Current is limited to the set values.

[CZ-RTC5] (demand-activated) displays on the remote

Demand meaning

LV3 LV2 LV1 COM

Demand

Terminal block

LV3 LV2 LV1

DRED (Demand controller)

Relay contact point: No voltage relay

Current input is DC 24 V 10 mA

COM

Use a very small electric current contact point for the relay.

1 - 26

Page 37

10. Other Functions

2WAY VRF SYSTEM

Control Functions

12. Other Functions

Mini VRF SYSTEM

Control Functions - Outdoor unit

(1) Auto Cooling/Heating Function

(It is impossible to perform the simultaneous cooling/heating operation.)

While the system is operating, the system judges whether to switch the mode in XX minutes intervals. While the system is stopped, change the mode immediately.

Case 1

Number of thermostat ON indoor units in cooling mode >

system selects cooling mode

→ The heating indoor units will be forced to thermostat OFF.

Case 2

Number of thermostat ON indoor units in cooling mode < →

system selects heating mode

The cooling indoor units will be forced to thermostat OFF.

*“XX” is able to be set in EEPROM on the outdoor unit’s PCB.

EEPROM setting in main outdoor unit CODE: 27

Number of thermostat ON indoor units in heating mode

Setting No.

50 50

60 60

90 90

120 120

180 180

240 240

(factory preset mode)

Invalid

1 - 27

Page 38

3WAY SYSTEM

Control Functions

13. Other Functions

10. Other Functions

(2) Maintenance Function for Power Supply Stop of Indoor Unit (E06 ignore)

The system can continue operation even if outdoor unit cannot communicate with some indoor units. It is necessary to set to EEPROM the allowed number of operating indoor units not to be able to communicate. The system will continue operating until the following condition is made to be satisfied.

Value set by the code “23” ≥No. of indoor units operated until the last moment because of communicative

disorder caused by power supply stop (excluding stopped indoor units). However, the upper limit value set by the code "23" must be less than 25% of the total number of indoor units

of the system.

EEPROM setting in main outdoor unit CODE: 23

Allowed number of missing indoor unitSetting No.

-1

0 0

1 1

This function is invalid

(factory preset mode)

Mini VRF SYSTEM

Control Functions - Outdoor unit

Never use

* However, the upper limit value set by the code "23" must be less than 25% of the total number of indoor units of the system.

Examples :

In case of 8 indoor units, setting No. becomes “2”.

Normal operation

Operation continue: Indoor unit failure=2

ON ON ON ON ON OFF OFF OFF

Error occurs: Indoor unit failure=3 > Setting No “2”

ON ON ON ON ON OFF OFF OFF

Setting No “2”

Operation continue: Stopped units does not count

ON ON ON ON ON OFF OFF OFF

1 - 28

Page 39

11. Detailed Settings in EEPROM of Outdoor Unit

Control Functions - Outdoor unit

Mini VRF SYSTEM

Never use the DN code unlisted in the following table. (P) : Factory preset mode

DN Item Setting No.

0=Invalid (P) 1=Silent mode 1

05 Outdoor fan silent mode

0C Indoor unit drain pump forced operation

Measures against smell when indoor unit cooling

thermostat OFF

Setting of control validity range when pressing the

Energy saving button

1A Demand 1 current (%)

1B Demand 2 current (%)

1E Demand remote controller display

23 E06 ignore function

24 Indoor Unit Self Oil Recovery Control

Auto Cooling / Heating Functions mode change mask

time

2A Dew condensation prevention control of indoor unit

2B DP operation time for slime measures

2=Silent mode 2,,,,, 15=Silent mode 15 (For details, see "4. Outdoor Unit Fan Control (6)") 0=Invalid 1=stop for 2 hours and drive for 20 minutes constantly 2=stop for 20 minutes and drive for 20 minutes constantly 3=Drive constantly 4-6=delay drive when thermostat OFF 7=delay drive when thermostat OFF (P) (For details, see "5. Outdoor Unit CCU Control (4)") 0=Invalid (P) 1=Measures against smell 0=for group (P) 1=for refrigerant system (For details, see “9. Demand Control (2)”) 0=0% 40=40% 45=45%,,,,, 100=100% (P) ,,,,, 130=130% -1=No control (For details, see "9. Demand Control") 0=0% 40=40% 45=45%,,,,, 70=70% (P) ,,,,, 130=130% -1=No control (For details, see "9. Demand Control") 0=No demand display 1=When demand ON, “demand - actived” display (P) 2=When forced thermostat OFF with demand ON,

“demand - actived” display (For details, see "9. Demand Control")

-1=Invalid (P) 0=0 1=1 ,,,,, 3=3 4 - 64=Never use (For details, see "10. Other Functions") 0=fan stop 1=fan operate & Te +5°C shift (For Type D1, K1, K2) (For details, see "6. Oil Control (5)") 0=Invalid (P) 30=30 minutes 40=40 minutes ,,,,, 240=240 minutes (For details, see "10. Other Functions (1)") 0=Invalid (P) 1=30 minutes 2=40 minutes 3=50 minutes 4=60 minutes 20=20 minutes 30=30 minutes (P) 40=40 minutes 50=50 minutes 60=60 minutes (For details, see "5. Outdoor Unit CCU Control (4)")

1 - 29

Page 40

11. Detailed Settings in EEPROM of Outdoor

PCB and Functions

1. Outdoor Unit Control PCB

(1) Outdoor Unit Control PCB

LED2

LED1

SW2

SW1

CN-HPS

RUN

TEST

CN-EXG

STOP

CN-TO

CHK

CN-MOV2

CN-MOV1

CN-SILENT

CN-ROM

SA1

CN-OC

CN-EMG

CN-RC

CN-TERMINAL

CN-LPS

MODE

A.ADD

DEF

CN-OIL

SW4

SW3

CN-SCT

CN-EXL

CN-DISCH

JP001

Unit

Mini VRF SYSTEM

Control Functions - Outdoor unit

Never use the DN code unlisted in the following table. (P) : Factory preset mode

DN Item Setting No.

Outdoor silent mode as input setting "Valid" or "Invalid"

from the indoor unit remote controller

Outdoor unit capacity

(Setting when the data is not stored in the EEPROM. Do not change under normal conditions.)

A3 The minimum operating time 1 until defrosting

C1 O

output change

Discharge air temperature control with thermostat OFF additional time

0=Invalid (P) 1=Valid (For details, see "4. Outdoor Unit Fan Control (6)")

0=Invalid 21=224 23=280

20=20 minutes 21=21 minutes ,,,,, 35=35 minutes (P) ,,,,, 40=40 minutes 41 - 90=Never use (For details, see "8. Defrost Control (2)") 0=Continuously set OFF (P) 1=Refrigerant leak prevention (normal OFF) 2=Refrigerant leak prevention (normal ON) 3=Pumpdown control (For details, see "3. Special Control (3)")

-20=-20 minutes -19=-19 minutes ,,,,, 0=0 minute (P) ,,,,, 10=10 minutes (For details, see "5. Outdoor Unit CCU Control (5)")

1 - 30

Page 41

12. Outdoor Unit Control PCB

PCB and Functions

1. Outdoor Unit Control PCB

Mini VRF SYSTEM

Control Functions - Outdoor unit

(1) Outdoor Unit Control PCB

LED2

LED1

JP001

SW2

SW1

CN-DISCH

CN-EXL

CN-SCT

SW3 SW4

CN-OIL

DEF

A.ADD

CN-MOV2

CHK

CN-TO

STOP

CN-EXG

TEST

RUN

CN-HPS

CN-MOV1

CN-LPS

MODE

CN-SILENT

SA1

CN-ROM

CN-TERMINAL

CN-EMG

CN-OC

CN-RC

1 - 31

Page 42

12. Outdoor Unit Control PCB

PCB and Functions

1. Outdoor Unit Control PCB

(2) Outdoor Unit HIC PCB

Mini VRF SYSTEM

Control Functions - Outdoor unit

1 - 32

Page 43

12. Outdoor Unit Control PCB

(3) Functions

A. ADD pin (2P, Black) Auto address setting pin

• Short-circuit this pin for 1 second or longer to automatically set the addresses at the indoor units that are connected to that outdoor unit and are within the same system.

• The system address is "1" at the time of shipment. Auto address setting is necessary even for communications lines in a single system where the inter-unit control wiring does not cross to any other systems.

• While auto address setting is in progress, the 2 LEDs (LED1, 2: Red) on the outdoor unit control PCB blink alternately. (Short-circuiting this pin while auto address setting is in progress will stop the auto address setting operation.)

Mini VRF SYSTEM

Control Functions - Outdoor unit

SW1 DIP switch (2P, Black)

SW2 Rotary switch (10 positions, Yellow)

SW3 DIP switch (2P, Black)

SW4 Rotary switch (10 positions, Red)

Switches for setting system address 10s digit and 20s digit

• If 10 systems or more are set, the setting is made by a combination of this DIP switch and S002.

• If 10 - 19 systems are set, set switch 1 (10s digit) to ON.

• If 20 - 29 systems are set, set switch 2 (20s digit) to ON, and set switch 1 (10s digit) to OFF.

• If 30 systems are set, set both switch 1 (10s digit) and switch 2 (20s digit) to ON.

(For details, see Table 1.)

Outdoor system address setting switch

• The setting is "1" at the time of shipment. It is not necessary to change the setting if wiring is connected only to an outdoor unit and indoor units in a single system and the inter-unit control wiring does not cross multiple systems.

• If wiring links the inter-unit control wiring for multiple systems to the same communications lines, then a different address must be set for each refrigerant tubing system.

• If wiring links multiple systems, a maximum of 30 systems (up to 64 indoor units) can be connected. This setting can be set up to "39," however control will be for 30 systems even if the setting is set to higher than 30. An alarm will be displayed if system addresses are duplicated. (For details, see Table 1.)

Switches for setting the 10s and 20s digit for the number of connected indoor units

• If 10 systems or more are set, the setting is made by a combination of this DIP switch and SW4.

• If 10 - 15 units are set, set only switch 1 (10s digit) to ON.

• Switch 2 is not used. (For details, see Table 2.)

Switch for setting the number of connected indoor units. In order to allow the outdoor unit to manage indoor units in the same refrigerant system, set the number of connected indoor units. (For details, see Table 2.)

1 - 33

Page 44

12. Outdoor Unit Control PCB

Mini VRF SYSTEM

Control Functions - Outdoor unit

CN-TERMINAL pin (3P, Black)

LED1, 2 (2P, Red) • LED 1 and 2 blink alternately while auto address setting is in progress.

RUN pin (2P, Black)

STOP pin (2P, Black) Stop pin

AP pin (2P, Black) Vacuuming pin

MODE pin (3P, Black) Indoor unit Heating/Cooling mode change pin

For communications circuit impedance matching

• A connecting socket (3P, Black) is attached to the terminal plug at the time of shipment from the factory.

• In the case of link wiring which combines the inter-unit control wiring for multiple systems into a single communications circuit, When using, refer to the item “4. Auto Address Setting” under the section “7. TEST RUN”.

• Display the alarm contents for alarms which were detected by the outdoor unit.

Start pin Short-circuit this pin and apply a pulse signal to start all indoor units in that refrigerant system.

Short-circuit this pin and apply a pulse signal to stop all indoor units in that refrigerant system.

• To perform vacuuming of the outdoor unit, short-circuit this pin and then turn the power ON. All solenoid valves turn ON and vacuuming begins smoothly. (Do not perform auto address setting at this time.)

• Release the short-circuit to return the unit to normal status.

• During the summer season, short-circuit this pin in the cooling mode.

Then, perform auto address setting. When auto address setting is completed, release the short-circuit to return the unit to normal status.

• When cooling mode is short-circuited, only cooling operation can be used.

• When heating mode is short-circuited, only heating operation can be used.

TEST pin (2P, Black) • This pin is used to test the PCB at the factory.

• When the power is turned ON after this pin has been short-circuited, all output signals will be

output in sequence. (Sequential output does not occur if this pin is short-circuited when the power is already ON.) Releasing this pin returns the unit to normal control.

CHK pin (2P, Black) When short circuited, test run begins.

(If the remote controller is connected in test run mode, it is automatically cancelled after 1 hour.) Also, if short-circuit is cancelled, test run mode is cancelled.

DEF pin (2P, Black) When the pin of the main unit is short-circuit in heating mode, defrosting operation is started.

Even if short circuited, defrosting will not be activated immediately.

SILENT plug (2P, White) Can be used when setting the outdoor unit fan in sound absorbing mode.

SA1 (Surge absorber) If “TO INDOOR UNIT” accidently connected to high voltage, use the following method.

1. Replace the wire CN-OC with the wire CN-EMG.

2. Cut off SA1.

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Page 45

12. Outdoor Unit Control PCB

Table 1

Examples of refrigerant circuit (R.C.) address settings (required when link wiring is used) (SW1, SW2)

System address No.

System 1 (factory setting)

System 11

System 21

System 30

Table 2

Examples of the number of indoor units settings (SW3, SW4)

Number of indoor units

1 unit (factory setting)

11 units

15 units

System address (SW1)

(2P DIP switch)

Both OFF

1 ON

2 ON

Both ON

Indoor unit setting (SW3)

(2P DIP switch)

Both OFF

1 ON

10 20

Mini VRF SYSTEM

Control Functions - Outdoor unit

System address (SW2)

(Rotary switch)

OFF

Set to 1

Set to 0

Indoor unit setting (SW4)

(Rotary switch)

OFF

Set to 1

Set to 5

The sub unit control P.C. board contains the same switches as the main unit control P.C. board for the number of indoor units, and system address. However it is not necessary to set these switches.

1 - 35

Page 46

13. Electrical Data

(1) Electric Wiring Diagram U-8LE1R8(E), U-10LE1R8(E)

Mini VRF SYSTEM

Control Functions - Outdoor unit

1 - 36

Page 47

Mini VRF SYSTEM

Contents

Control Functions - Indoor Unit

2. CONTROL FUNCTIONS - Indoor Unit

1. Room Temperature Control .............................................. 2-2

2. Heating Standby ....................................................... 2-4

3. Automatic Fan Speed Control ............................................ 2-5

4. Indoor Unit MOV Control ................................................ 2-6

5. Drain Pump Control .................................................... 2-6

6. Automatic Heating / Cooling Control ...................................... 2-7

7. Discharge Air Temperature Control ....................................... 2-8

8. RAP Valve Kit Control ................................................... 2-8

9. Automatic Flap Control ................................................. 2-9

10. Filter Sign ............................................................ 2-9

11. Fan Control during Dry Mode ........................................... 2-10

12. Ventilation Fan Output ................................................. 2-11

13. T10 Terminal .......................................................... 2-11

14. Parameter ............................................................ 2-12

2 - 1

Page 48

1. Room Temperature Control

Control Functions - Indoor Unit

1. Room Temperature Control

The body sensor or remote controller sensor detects temperature in the room. The detected temperature is

called the room temperature. The body sensor is the one contained in the indoor unit.

Body sensor is enabled Remote controller sensor is enabled

Set temp. Set temp. in remote controller Set temp. in remote controller

Detected temp. by sensor

Room temp. Detected temp. by body sensor -

The thermostat is turned ON or OFF according to the following T.

T (Cooling) T = room temp. – set temp. (set temp. in remote controller)

T (Heating) T = set temp. – room temp.

Correction temperature (only during heating) If the indoor unit is installed on the ceiling, temperature near the ceiling is higher than near the floor. When the body sensor is enabled, lower temperature near the floor must be considered. To correct this difference in temperature, the correction temperature is used.

The factory setting for the correction temperature is different depending on the model. See “14. Parameter”.

Detected temp. by body sensor Detected temp. by remote controller

sensor

Detected temp. by remote controller

*correction temp.

sensor　

Mini VRF SYSTEM

Example: Cooling temperature correction 4-Way cassette (correction temperature: 0 degrees) Body sensor is enabled

Set temp. in remote controller

Detected temp. by sensor

Detected temp. by body sensor

Detected temp. by remote controller sensor

Room temp. = temp. detected by body sensor

T +2.0deg -0.5deg -1.0deg

28℃ 28℃ 28℃

30.0℃ 27.5℃ 27.0℃

30.0℃ =30.0

27.5℃ =27.5

27.0℃ =27.0

Example: Heating temperature correction 4-Way cassette (correction temperature: 4 degrees) Body sensor is enabled

Set temp. in remote controller

Detected temp. by sensor

Detected temp. by body sensor

Detected temp. by remote controller sensor

Room temp. = temp. detected by body sensor – 4 deg

T +7.0deg +2.0deg -1.0deg

20℃ 20℃ 20℃

17.0℃ 22.0℃ 25.0℃

13.0℃ 18.0℃ 21.0℃

13.0℃ =17.0-4 deg

18.0℃ =22.0-4 deg

21.0℃ =25.0-4 deg

ThermostatONThermostatONThermostat

OFF

ThermostatONThermostatONThermostat

OFF

2 - 2

Page 49

1. Room Temperature Control

Body sensor is enabled Remote controller sensor is enabled

Mini VRF SYSTEM

Control Functions - Indoor Unit

Remote controller sensor is enabled

Set temp. in remote controller

Detected temp. by sensor

Detected temp. by body sensor

28℃ 28℃ 28℃

30.0℃ 27.5℃ 27.0℃

Detected temp. by remote controller

30.0℃ 27.5℃ 27.0℃

sensor

Room temp. = temp. detected by remote controller sensor

30.0℃ =30.0

27.5℃ =27.5

27.0℃ =27.0

T +2.0deg -0.5deg -1.0deg

ThermostatONThermostat

OFF

Thermostat OFF

Remote controller sensor is enabled

Set temp. in remote controller

Detected temp. by sensor

Detected temp. by body sensor

20℃ 20℃ 20℃

17.0℃ 20.5℃ 21.0℃

21.0℃ 24.5℃ 25.0℃

Detected temp. by remote controller

17.0℃ 20.5℃ 21.0℃

sensor

Room temp. = temp. detected by remote controller sensor

17.0℃ =17.0

20.5℃ =20.5

21.0℃ =21.0

T +3.0deg -0.5deg -1.0deg

ThermostatONThermostat

OFF

Thermostat OFF

(deg)

Room temp.

Set temp.

-1

(deg)

-1

Room

temp.

Set temp.

Thermostat Thermostat

Cooling

ON ONOFF

Heating

ON ONOFF

(deg)

Room temp.

Set temp.

-0.5

-1

ThermostatThermostat

(deg)

-1

Room

temp.

-0.5

Set temp.

ON ONOFF

① The thermostat does not turn OFF for 3 minutes after it turns ON.

Cooling

Heating

② The thermostat does not turn ON 1 to 3 minutes after it turns OFF.

③ The thermostat does not turn OFF for 60 minutes during the test run mode. (Forced thermostat ON)

*However, the thermostat turns OFF if an alarm occurs.

2 - 3

Page 50

1. Room Temperature Control

2. Heating Standby

Control Functions - Indoor Unit

Mini VRF SYSTEM

< FRESH AIR INTAKE MODE (Type E2) >

Intake Air Temperature Control

This product brings outdoor fresh air into the building and adjusts and supplies the air with nearly current indoor temperature.

Automatic cooling and heating operation mode

Due to the temperature difference between the outdoor air and preset temperature in remote controller, cooling or heating operation can be automatically selected.

In the case of group control, the setting is possible when all of the indoor units in the same refrigerant circuit consist of one group.

Cooling operation mode : In case that the outdoor temperature is 5°C higher than the preset temperature in remote

①

controller.

Fan operation mode : In case that the outdoor temperature and preset temperature in remote controller are within

②

±5°C.

Heating operation mode : In case that the outdoor temperature is 5°C lower than the preset temperature in remote

③

Example: In case that the preset temperature in remote controller set at 20°C

controller.

Outdoor temperature (°C)

)5–()5–(

(+5)

15 25

(43)4030100

Heating operation mode

Discharge temperature setting at 45°C

Fan operation

②③ ①

mode Discharge temperature setting in a range of 15 - 25°C

Cooling operation

mode Discharge temperature setting at 18°C

Cooling operation mode

It is recommended that the temperature setting in remote controller be more than 24°C.

If the intake air temperature is getting higher than the preset temperature in remote controller, the unit operates in cooling

mode. On the contrary, if the intake air temperature becomes lower than the preset temperature, the unit operates in fan mode.

Heating operation mode

It is recommended that the temperature setting in remote controller be set at 16°C.

If the intake air temperature is getting lower than the preset temperature in remote controller, the unit operates in heating

mode. On the contrary, if the intake air temperature becomes higher than the preset temperature, the unit operates in fan mode.

Fan operation mode

In the moderate climates, supply of fresh outdoor air can provide as passive cooling.

NOTE

In general, it is recommended that you set in the automatic cooling and heating operation mode.

2. Heating Standby

Refer to the indoor unit service manual.

2 - 4

Page 51

Mini VRF SYSTEM

Cooling

3. Automatic Fan Speed Control

① The indoor fan mode is controlled as shown below during the automatic fan mode. ② The fan mode does not change for 3 minutes during cooling operation and 1 minute during heating

operation once it is changed.

③ The values in the parenthesis are when the remote controller sensor is enabled.

Heating

Control Functions - Indoor Unit

(deg)

Set temp.

Indoor fan mode HH

(deg)

Set temp.

(-1)-2

(-2)-4

Indoor fan mode

2 - 5

Page 52

4. Indoor Unit MOV Control

5. Drain Pump Control

4. Indoor Unit MOV Control

For details, see the Section 1.

The MOV is at 480 pulses in the following cases.

① At the time of factory shipment ② Just after the indoor unit power cord is connected.

5. Drain Pump Control

The drain pump operates in the following conditions.

① Cooling thermostat ON ② The ﬂoat switch worked. ③ The drain pump may often operate for a while when the cooling thermostat turns OFF or the indoor

unit is stopped.

④ The drain pump can be turned on when the cooling thermostat is OFF if the setting is made to prevent

water collected in the drain pan for a long time. For details, see the item "5-2. Detailed Settings Function" under the Section 5.

⑤ The indoor unit heat exchanger liquid temperature (E1) is less than 0˚C when the cooling thermostat

is OFF or the indoor unit is stopped.

Mini VRF SYSTEM

Control Functions - Indoor Unit

The drain pump operates for 20 minutes once it starts operating.

2 - 6

Page 53

6. Automatic Heating / Cooling Control

( )* : FRESH AIR INTAKE MODE (Type E2)

This function is only valid as long as one indoor unit is installed within one refrigerant system or all indoor units are controlled within a group control.

When operating in a group control, the sub-indoor units become the same operation mode of the main unit. As for the indoor units in a group control, install them in the same air conditioning circumstances. Use the temperature sensor which is built-in sensor of the indoor unit.

The operating mode is selected according to the set temperature and room temperature when the

operation is started. Room temperature

set temperature in remote controller – 1˚C (+ 5˚C)*

Room temperature < set temperature in remote controller – 1˚C (– 5˚C)* → Heating mode

The set temperature is corrected according to the operating mode. The correction temperature is +2

degrees in cooling mode and -2 degrees in heating mode at the time of factory shipment.

The correction value is different depending on the model. See “14. Parameter” for details.

Corrected cooling temperature – control temperature for cooling Corrected heating temperature – control temperature for heating

Mini VRF SYSTEM

Control Functions - Indoor Unit

→ Cooling mode

When setting temperature in remote controller is 20˚C in the cooling mode (at shipment) :

Control temp. for cooling 22˚C (25˚C)*

Set temp. in remote controller 20˚C (20˚C)*

Control temp. for heating 18˚C (15˚C)*

Condition for mode change

Heating → Cooling: Room temperature > Control temperature for cooling + 0.5 degree Cooling → Heating: Room temperature < Control temperature for heating -1.0 degree

When setting temperature in remote controller is 20˚C in the cooling mode :

Control temp. for cooling

Cooling thermostat OFF temp.

Heating thermostat OFF temp.

Control temp. for heating

Temp. for switching to heating

+2.5deg (+5.5deg)*Temp. for switching to cooling

+2deg (+5deg)*

+1deg (+4deg)*

Set temp. in remote controller

-1deg (-4deg)*

-2deg (-5deg)*

-3deg (-6deg)*

Heating

Heating thermostat OFF

The heating thermostat OFF continues for 10 minutes regardless of temp. condition. Then, the mode changes to cooling.

For settings at the time of factory shipment, see “14. Parameter”.

2 - 7

Cooling

Cooling thermostat OFF

Heating

The cooling thermostat OFF continues for 10 minutes regardless of temp. condition. Then, the mode changes to heating.

Page 54

7. Discharge Air Temperature Control

8. RAP Valve Kit Control

7. Discharge Air Temperature Control

Discharge air temperature is controlled using the indoor unit discharge air temperature sensor. The discharge air temperature is set in the EEPROM on the PCB. The setting is different depending on the model. Discharge air temperature setting (at the time of factory shipment)

Indoor unit type

Y2, F2, M1, E2, K2 12˚C 50˚C

E2 (FRESH AIR INTAKE MODE) 18˚C 45˚C

Condition for Thermostat ON → OFF under discharge air temperature control

① Temperature less than “Discharge air temperature setting – 2˚C” is continuously detected for 20

minutes in cooling mode

② Temperature more than “Discharge air temperature setting + 2˚C” is continuously detected for 20

minutes in heating mode

③ Temperature less than “Discharge air temperature setting – 3.5˚C” is continuously detected for 7

minutes in cooling mode

④ Temperature more than “Discharge air temperature setting + 3.5˚C” is continuously detected for 7

minutes in heating mode

There is no priority order between the room temperature control and discharge air temperature control.

Mini VRF SYSTEM

Control Functions - Indoor Unit

Discharge air temperature setting

Cooling Heating

Relation between thermostat ON / OFF and room temperature control / discharge air temperature control

Thermostat turns OFF: Either room temperature control or discharge air temperature control satisﬁes thermostat OFF condition. Thermostat turns ON: Both of room temperature control and discharge air temperature control satisfy thermostat ON condition.

8. RAP Valve Kit Control

The RAP valve kit is sometimes used in the 2WAY system. The RAP valve kit prevents refrigerant from collecting in the indoor heat exchanger when the indoor unit is stopped. The following table shows the RAP valve kit operation.

Operating mode RAP valve kit

Stopped OFF

Fan OFF

Cooling

Heating

Thermostat ON OFF

Thermostat OFF OFF

Thermostat ON ON

Thermostat OFF OFF

2 - 8

Page 55

9. Automatic Flap Control

10. Filter Sign

9. Automatic Flap Control

The flap position can be selected from 5 positions.

Operating mode Flap position

① The ﬂap moves to the following position automatically when the indoor unit is stopped.

F0 (close): Types K1, K2, T2, D1, U1, Y2 F5: Models other than the above

② The ﬂap closes once and moves to the set position when the operating mode is changed.

※ If the flap position cannot be adjusted because of a problem, only the swing operation can be

used. Check the ﬂap and ﬂap motor.

※ The swing operation can be set for the ﬂap.

Cooling / Dry F1・F2・F3 Fan F1・F2・F3・F4・F5 Heating F1・F2・F3・F4・F5

Control Functions - Indoor Unit

Mini VRF SYSTEM

10. Filter Sign

① When accumulated operating time of the indoor unit reaches the set time, the ﬁlter sign appears on

the remote controller. Clean the ﬁlter. See page 5-5.

② After cleaning the ﬁlter, press the ﬁlter button on the remote controller once. The ﬁlter sign turns off.

2 - 9

Page 56

11. Fan Control during Dry Mode

The fan control during dry mode is as follows.

T (deg)

Set temp. in remote controller

-1

A: Fan mode set in the remote controller

B: Fan mode is L during thermostat ON, LL during thermostat OFF

For details on T, see “1. Room Temperature Control”.

Mini VRF SYSTEM

Control Functions - Indoor Unit

BFan mode

2 - 10

Page 57

12. Ventilation Fan Output

13. T10 Terminal

12. Ventilation Fan Output

The output of ventilation turns ON when the indoor unit turns ON. Also, when the indoor unit turns OFF,

the output of the ventilation turns OFF.

The ventilation fan can also be turned ON and OFF using the ventilation button on the remote controller.

Refer to the operating instractions supplied with the remote controller.

To enable this function, set the indoor EEPROM DN31 to “0001” in advance.

13. T10 Terminal

Using the T10 terminal, each indoor unit can be operated or stopped separately. Also, operating condition can be checked.

Control Functions - Indoor Unit

Mini VRF SYSTEM

2 - 11

Page 58

14. Parameter

Type Model

Correction temp. (heating)

Mini VRF SYSTEM

Control Functions - Indoor Unit

Heat / cool switching

correction temp.

(automatic heat / cool)

Setting at time of factory

shipment

U1 4-Way Cassette 4 deg 2 deg

Y2 4-Way Cassette 60×60 4 deg 2 deg

L1 2-Way Cassette 4 deg 2 deg

D1 1-Way Cassette 4 deg 2 deg

F2 Low Silhouette Ducted 4 deg 2 deg

T2 Ceiling 4 deg 2 deg

K1 Wall Mounted 2 deg 2 deg

K2 Wall Mounted 3 deg 2 deg

M1 Slim Low Static Ducted 4 deg 2 deg

High Static Pressure Ducted 4 deg 2 deg

High Static Pressure Ducted (FRESH AIR INTAKE MODE)

0 deg 5 deg

Setting at time of factory

shipment

P1 Floor Standing 0 deg 2 deg

R1 Concealed Floor Standing 0 deg 2 deg

2 - 12

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Mini VRF SYSTEM

Contents

Outdoor Unit Repair Procedures

3. OUTDOOR UNIT REPAIR PROCEDURES

1. Removing Panels ....................................................... 3-2

2. Discharging Compressor Oil ............................................. 3-3

3. Recovering Refrigerant .................................................. 3-4

4 Checking for Leakage After Repair ........................................ 3-9

5. Evacuating System .................................................... 3-10

6. Charging Compressor Oil ............................................... 3-11

7. Pumping Out Refrigerant from Outdoor Unit ............................... 3-15

8. Compressor .......................................................... 3-18

3 - 1

Page 60

1. Removing Panels

Mini VRF SYSTEM

Outdoor Unit Repair Procedures

CAUTION

(1) Front panel removal

• Remove the front panel (remove 2 screws).

(2) Cover A removal

• Remove the cover A (remove 1 screw).

Be sure to turn off the power before maintenance. When the power is turned off, wait for 5 minutes without any work. Then start working.

Front panel

Cover A

Fig. 1

3 - 2

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Mini VRF SYSTEM

2. Discharging Compressor Oil

2-1. Discharging Oil in Compressor

Recover the refrigerant in the outdoor unit following the procedures in “3. Recovering Refrigerant.” Remove the compressor and discharge the oil in it. See the section “8. Compressor” for detailed procedures.

2-2. Checking the Oil

Acceptance/rejection criteria for the oil

Condition of

refrigeration cycle

Normal Light chestnut None 0.02 or less 3.5 or less

Abnormal overheat-

operation

Motor burnout

* It is difficult to measure the total acid value in the field, therefore oil hue and odor are the rule of thumb.

Checking for carbon deposits and abrasive metal powder can additionally be used to assess the system condition.

Color Odor Total acid value Hue

Brownish

Brownish /

blackish

Condition of oil Judgment criteria for changing oil*

Smells somewhat

(not as strong as below)

Pungent / burnt odor

Outdoor Unit Repair Procedures

over 0.06 over 4.0

Changing the oil and system cleaning

with dry-cores are necessary.

Changing the oil and system cleaning

with dry-cores are necessary.

3 - 3

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Mini VRF SYSTEM

3. Recovering Refrigerant

The following equipment and tools are required:

Jumper wire with clips, adjustable wrench, set of manifold gauge valves specially designed for refrigerant R410A only, vacuum pump, refrigerant recovery unit, pre-purged refrigerant cylinder for recovery, flathead screwdriver, and outdoor unit maintenance remote controller.

3-1. Refrigerant Recovery Procedures (from outdoor unit)

(1) Turn off the power of the outdoor unit beforehand (at power mains). (2) Fully close each service valve on the liquid tube and gas tube of the outdoor unit. (3) Connect the outdoor unit’s high-pressure and low-pressure outlet ports with the Hi and Lo sides of the mani-

fold gauge valves using hoses. (Fig. 2)

The remaining refrigerant in the faulty outdoor unit may create internal pressure.

CAUTION

(4) Connect the manifold gauge valves, refrigerant recovery unit, and recovery cylinder using hoses. To avoid the

entry of air into the refrigerant tubing, carry out this connection work carefully. (Fig. 2)

CAUTION

Before connecting hoses, be sure to confirm that each of the manifold gauge valves is tightly closed. Note that the connection ports employ Schrader-type push-to-release valves.

For detailed procedures such as connecting the refrigerant recovery unit with the recovery cylinder and methods used for recovery, follow the specific instructions that came with the refrigerant recovery unit.

Outdoor Unit Repair Procedures

(5) Locate the AP pin on the control PCB in the faulty outdoor unit and short them using the clips of

the jumper wire. Then restore electrical power to the outdoor unit.

By short-circuiting the AP pin, each solenoid valve in the outdoor unit is forcibly

CAUTION

opened as soon as power comes on, which releases all remaining refrigerant into the recovery cylinder. Since neglecting this procedure may leave some refrigerant in the system, it is important that you carry out this step.

(6) Carry out refrigerant recovery.

To determine the completion of refrigerant recovery, follow the instructions that

CAUTION

Refrigerant recovery unit

Refrigerant recovery cylinder

came with the refrigerant recovery unit.

Manifold

gauge

Lo Hi

Low-pressure outlet port (for ø7.94mm-dia connector)

High-pressure outlet port (for ø7.94mm-dia connector)

Liquid tube service port (for ø7.94mm-dia connector)

Gas tube service port (for ø7.94mm-dia connector)

Fig. 2

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Mini VRF SYSTEM

3. Recovering Refrigerant

3-2. Refrigerant Recovery Procedures (Indoor Unit)

The flowchart below shows the refrigerant recovery procedures you must follow when replacing or repairing the indoor unit due to trouble in the refrigerant circuit.

START

3-2-1. Cooling operation (for all units)

Outdoor Unit Repair Procedures

Ball valve is provided in the indoor unit

YES

3-2-2. Refrigerant recovery

procedures (1)

Turn off all equipment in system

When replacing or repairing a faulty

unit, let other normal indoor units run

(excluding indoor unit where refrigerant

is recovered)

YES

Power can independently be turned off

for indoor unit where refrigerant is

recovered

YES

Change controllable number of indoor

units (including changes in group

control and integrated-control settings)

Other indoor units can operate normally

Replace or repair faulty unit

Check for leakage in repaired unit

Evacuate air from repaired unit

Charge refrigerant in repaired unit

(Amount of charge should equal that

recovered by refrigerant recovery unit)

3-2-3. Refrigerant recovery

procedures (2)

Modify power to permit turning off

power to refrigerant-recovered

indoor units independently

Turn off all equipment in system

Replace or repair faulty unit

Check for leakage in repaired unit

Evacuate air from repaired unit

Charge refrigerant in repaired unit

(Amount of charge should equal that

recovered by refrigerant recovery unit)

Ready for operation

END

Replace or repair faulty unit

Check for leakage in repaired unit

Evacuate air in repaired unit

Change controllable number of indoor

units (including changes in group

control and integrated-control settings)

Open ball valve

Ready for normal operation

END

Service work performed on indoor units is done simultaneously using the service ports at the liquid (narrow tube) side and the

gas (wide tube) side ball valves. Refer to each section in the “Installation Instructions” on refrigerant charging, leak checking, and evacuation procedures.

Charge refrigerant in repaired unit

(Amount of charge should equal that

recovered by refrigerant recovery unit)

Open the ball valve

Ready for normal operation

END

3-2-1. Cooling operation (for all units)

(1) If the remote controller is used for maintenance of the outdoor unit

1 Connect the outdoor unit maintenance remote controller to the RC connector on the outdoor unit control

PCBs. Then start a test run of all units. (Press and hold the (CHECK) button for 4 seconds or longer.)

2 Press the

See the section 4 for the detail of the outdoor maintenance remote controller operation. It may be possible to determine whether operation is cooling or heating by touching the gas tubing.

Cooling : low temperature (20℃ or lower) Heating: high temperature (60℃ or higher)

(MODE) button and change to cooling operation and ensure that the cooling is performed.

CAUTION

The gas tubing becomes hot (60°C or higher) in heating mode. Be careful so as not to be burnt when touching the tubing.

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Mini VRF SYSTEM

3. Recovering Refrigerant

(2) If the remote controller is not available for maintenance of the outdoor unit

1 Short-circuit the MODE pin ("COOL" side) on the outdoor unit control PCB. 2 Short-circuit the CHK pin on the PCB to start test run operation.

3-2-2. Refrigerant recovery procedures (1) (using indoor unit ball valve)

(1) If a ball valve with a service port has been provided in the indoor unit as shown in Fig. 3, follow the instructions

given in (2) through (6) below. If the service port is instead located in the outdoor side, follow the instructions in “3-2-3. Refrigerant recovery procedures (2).”

(2) After running the unit in Cooling mode for about 5 minutes as described in “3-2-1. Cooling operation (for all

units),” fully close the liquid tube ball valve. (3) Run the unit in Cooling mode for 10 to 20 minutes more. (4) Fully close the gas tube ball valve, and stop the operation of all units. (5) Use hoses to connect the manifold gauge valves, refrigerant recovery unit, and refrigerant recovery cylinder

with each other. (Fig. 3) Do each connection quickly to prevent air from entering the tubing.

Remaining refrigerant may create internal pressure, therefore care should be

CAUTION

taken when connecting the hoses.

Outdoor Unit Repair Procedures

(6) Recover the remaining refrigerant from the indoor unit using the refrigerant recovery unit.

NOTE

To determine completion of refrigerant recovery, follow the instructions that came with the refrigerant recovery unit.

Manifold

gauge

Hi Lo

Refrigerant recovery unit

Refrigerant

recovery cylinder

Gas tube

Outdoor unit

Liquid tube

Ball valve

(field supply)

Service port

Indoor unit

Fig. 3

3 - 6

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Mini VRF SYSTEM

3. Recovering Refrigerant

3-2-3. Refrigerant recovery procedures (2): Indoor unit with no ball valve equipped

Refrigerant in all indoor units and the refrigerant tubing circuit can be pumped into the outdoor unit. The maximum refrigerant storage capacity per a single outdoor unit is approx. 6.6 kg. Thus, in order to collect all refrigerant from the system, a separate refrigerant recovery unit is necessary. Follow these procedures to correctly perform pump down. Perform work correctly, according to the work procedures given below.

1 Connect the manifold gauge to the high- and low-pressure outlet ports on the outdoor unit where pump down

will be performed. Be sure that no air enters the tubing at this time.

2 Follow the instructions in “3-2-1. Cooling operation (for all units)” and operate all units in Cooling mode for

approximately 10 minutes. Then fully close the liquid tube valve on the outdoor unit where pump down will be performed.

3 When the high-pressure gauge reaches 2.8 MPa or higher, or the low-pressure gauge reaches 0.5 MPa or

below, at the outdoor unit where pump down is being performed, press the ON/OFF button on the outdoor unit maintenance remote controller to stop operation at all units. Then immediately fully close the gas tube valve on the outdoor unit where pump down is being performed. * If the outdoor unit maintenance remote controller is unavailable, short-circuit the STOP pin.

4 Using hoses with Schrader-type push-to-release valves, connect the manifold gauge valves to the gas tube

service port, the liquid tube service port to undergo pump down. (Fig. 4)

Outdoor Unit Repair Procedures

CAUTION

5 Use hoses to connect the manifold gauge valves, refrigerant recovery unit, and refrigerant recovery cylinder.

Quickly connect each part to prevent air from entering the tubing.

6 Recover remaining refrigerant from the inter-unit tubing and indoor units using the refrigerant recovery unit.

NOTE

To determine the completion of refrigerant recovery, follow the instructions that came with the refrigerant recovery unit.

Remaining refrigerant in the system may cause internal pressure. Check that each valve on the manifold gauge is tightly closed. A Schrader-type push-to-release valve is provided for each connection port.

3 - 7

Page 66

3. Recovering Refrigerant

Mini VRF SYSTEM

Outdoor Unit Repair Procedures

Low-pressure outlet port (for ø7.94mm-dia connector)

High-pressure outlet port (for ø7.94mm-dia connector)

Liquid tube service port (for ø7.94mm-dia connector)

Gas tube service port (for ø7.94mm-dia connector)

Refrigerant recovery unit

Refrigerant recovery cylinder

Manifold

gauge

Lo Hi

Fig. 4

3-3. Refrigerant recovery from Entire System

(1) Turn off power to the outdoor unit. (2) Short-circuit the AP pin on the outdoor control PCB, then supply power to the outdoor unit.

* By short-circuiting the AP pin and supplying power to the outdoor unit, the solenoid valve is forcibly opened

and all remaining refrigerant can be recovered.

(3) Connect the manifold gauge to the high- and low-pressure outlet ports (Schrader-type valves) on the outdoor

unit. (Fig. 4)

CAUTION

(4) Connect the manifold gauge valves, refrigerant recovery unit, and refrigerant recovery cylinder. Quickly connect

each part to prevent air from entering the tubing. (5) Check that each service valve of the gas tube and liquid tube for the outdoor unit has opened, then perform

refrigerant recovery.

NOTE

To determine the completion of refrigerant recovery, follow the instructions that came with the refrigerant recovery unit.

Remaining refrigerant may create internal pressure, therefore care should be taken when connecting the hoses.

3 - 8

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Mini VRF SYSTEM

4. Checking for Leakage After Repair

4-1. Pressure Check for Leakage of Outdoor Unit

After completing repair of the outdoor unit, carry out the following leakage check. (1) Check that all service valves for gas tube and liquid tube in the repaired outdoor unit (units necessary to carry

out the pressurized leak check) are fully closed. (2) Connect the manifold gauge valves to the high- and low-pressure outlet ports of the outdoor unit. (3) Feed nitrogen gas into the circuit until 3.8 MPa pressure is reached. If it is apparent that the nitrogen gas is not

entering the repaired section, interrupt the feeding. Short-circuit the AP pin on the outdoor unit control PCB,

turn on power to run the outdoor unit, then resume feeding nitrogen. (4) Apply soapy water to the repaired part (such as a newly brazed part), and briefly inspect for any leakage. If

there are any leaks, bubbles will show on the tubing surface.

* To continue the air-tight check after the brief leak inspection, turn on power while short-circuiting the AP pin.

Again feed nitrogen gas to obtain a system pressure of 3.8 MPa. Then measure both the outdoor ambient temperature and the pressure in the system. Leave the system in this state for 1 full day and night, and again measure the outdoor ambient temperature and pressure (to determine any reduced values). During the inspection, it is recommended that an awning or cover be used to shield the unit in case of rain. If no problem is found, purge all nitrogen from the system.

Outdoor Unit Repair Procedures

Nitrogen gas

Manifold gauge

Lo Hi

Low-pressure outlet port (for ø7.94mm-dia connector)

High-pressure outlet port (for ø7.94mm-dia connector)

Liquid tube service port (for ø7.94mm-dia connector)

Gas tube service port (for ø7.94mm-dia connector)

Fig. 5

4-2. Checking for Leakage in Refrigerant Tubing Between Indoor and Outdoor Units

Refer to the “Installation Instructions” that came with the outdoor unit.

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Mini VRF SYSTEM

5. Evacuating System

This procedure is carried out to ensure there is no remaining refrigerant or other gases (nitrogen, etc.) in the repaired outdoor unit and tubing.

5-1. Evacuating Repaired Outdoor Unit

(1) Check that each service valve of the gas tube and liquid tube in the outdoor unit are fully closed. (2) Connect the manifold gauge valves to the high-pressure and low-pressure sensor outlets of the outdoor unit.

(Fig. 6)

(3) Connect the manifold gauge valves to the vacuum pump.

* If the AP pin on the outdoor control PCB has already been short-circuited, step (4) is not necessary.

(4) Turn off power to the repaired outdoor unit and short-circuit the AP pin on the outdoor control PCB.

By short-circuiting the AP pin and turning on power to the outdoor unit, all

CAUTION

(5) Turn the power ON at the outdoor unit where vacuum will be applied. Then run the vacuum pump and continue

evacuation until the vacuum condition falls to less than –101kPa {–755 mmHg, 5 Torr}.

electronic valves in the outdoor unit are forcibly opened and any remaining nitrogen gas can be recovered. Failure to perform this procedure may result in nitrogen gas remaining in the refrigerant circuit and causing operating problems. Therefore, never skip this step.

Outdoor Unit Repair Procedures

CAUTION

Vacuum pump

To ensure proper evacuation, refer to the operating instructions that came with the vacuum pump.

Low-pressure outlet port (for ø7.94mm-dia connector)

Manifold gauge

Lo Hi

High-pressure outlet port (for ø7.94mm-dia connector)

Liquid tube service port (for ø7.94mm-dia connector)

Gas tube service port (for ø7.94mm-dia connector)

Fig. 6

5-2. Evacuating Refrigerant Tubing Between Indoor and Outdoor Units

For details, refer to the “Installation Instructions” that came with the outdoor unit.

3 - 10

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Mini VRF SYSTEM

6. Charging Compressor Oil

6-1. If Refrigerant Has Already Been Charged to Outdoor Unit

Be sure to use an exclusive oil-charging tank for charging compressor oil. Prior to charging, carry out vacuum drying inside the tank and take care that no air (in the form of bubbles) is permitted to enter the tank. The oil charging procedures are given below. *The receiver tank used for maintenance may be used as an exclusive oil-charging tank.

Outdoor Unit Repair Procedures

When installing the oil-charging

(DPR : CV6230817937)

tank to the refrigerant system to

serve as a safety bypass circuit

for refrigerant, connect it to the

Nipple

gas tube service port carefully to

avoid releasing refrigerant into the

atmosphere.

Perform oil charging

CAUTION

work carefully so that no

Packless valve

(Receiver-tank: CV6380152988)

liquid refrigerant enters the charging tank.

(1) Evacuation drying in oil-charging tank

With the lower side valve fully closed, open the upper side valve and connect it to the vacuum pump via the manifold gauge valves as shown below. Run the vacuum pump and evacuate the tank until the pressure falls to below –101kPa {–755mmHg, 5 Torr} for the evacuation drying. After the evacuation drying is finished, fully close the upper valve. Next, fully close the manifold gauge valves and stop the vacuum pump.

To ensure proper evacuation, refer to the operating instructions that came with the

CAUTION

vacuum pump.

Open Close

Vacuum pump

Manifold gauge

Upper side valve

Lower side valve

(2) Charging compressor oil into oil-charging tank

Connect a piece of pipe to the lower valve and then insert the other end deeply into the bottom of the oil container. Make sure you avoid letting any air be sucked into the tube. Next, run the vacuum pump and open the manifold gauge valves, then open the upper and lower valves to begin charging oil into the charging tank.

3 - 11

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Mini VRF SYSTEM

2WAY SYSTEM

Outdoor Unit Repair Procedures

7. Charging Compressor Oil

Next, follow the instructions in “3-2-1. Cooling operation (for all units)” at the outdoor unit where oil will be charged, and start cooling operation at all units. After the operating conditions were stabilized, open each valve (Hi-side

NOTE

To determine the completion of refrigerant recovery, follow the instructions that came with the refrigerant recovery unit.

When this is done, the refrigerant pressure from operation forces the oil out of the oil charge tank, and oil is charged into the outdoor unit from the low-pressure outlet port. Occasionally close the upper valve on the top of the oil charge tank (only this valve) and shake the tank to check the amount of remaining oil.

(1) Open the valve on the high-pressure side of the manifold gauge. (2) Open the upper valve. (3) Open the lower valve.

manifold gauge, upper valve and lower valve) in sequence as follows.

Operating valve

Hi-side

manifold

gauge

Lo-side

manifold

gauge

Upper

valve

Process

Oil

charging

Oil charge completed

Refrigerant

recovery

(oil-charging

tank inside)

Open

Close*

(No connection)

Open

(Connect to

refrigerant

recovery tank)

Open

Close after

approx. 60

seconds

Lower

valve

Completing oil-charging

To terminate the oil charging work, do as follows: To end the charge process, first close the valve on the Hi-side manifold gauge. Then wait approximately 60 seconds in order to vaporize the refrigerant in the charge tank. Then fully close the lower valve.

Refrigerant recovery (oil-charging tank inside)

Finally, connect the refrigerant recovery unit to the Lo-side manifold gauge, shut down all indoor and outdoor units, and then recover the remaining refrigerant in the oil-charging tank. Perform these procedures quickly and securely so that no air can enter them. Then, charge the necessary amount of new refrigerant by referring to the “Installation Instructions” that came with the outdoor unit.

(3)

Lower valve

Manifold gauge Lo Hi

(1)

DPR

(2) Upper valve

Connect from here to

refrigerant recovery unit

Fig. 8

Gas tube service port (for ø7.94mm-dia connector)

Low-pressure outlet port (for ø7.94mm-dia connector)

High-pressure outlet port (for ø7.94mm-dia connector)

Liquid tube service port (for ø7.94mm-dia connector)

6. Charging Compressor Oil

Manifold gauge

Vacuum pump

When the predetermined amount of oil has been charged into the oil-charging tank, immediately close the lower valve. Next, run the vacuum pump until the system pressure reaches lower than -101kPa {-755mmHg, 5 Torr}. Close the upper valve and then, stop the vacuum pump.

Do this operation quickly because compressor oil easily absorbs moisture from the

CAUTION

air.

Upper valve

Lower valve

Outdoor Unit Repair Procedures

Close Open

Oil

(3) Charging compressor oil into outdoor unit

Connect the lower valve to the low-pressure outlet (with Schrader-type push-to-release valve) in the outdoor unit to be oil-charged, and then connect the high-pressure outlet (with push-to-release valve) to the upper valve via the manifold gauge valves (at Hi-pressure gauge side). In addition, connect the gas tube service port (with push-to-release valve) to the DPR (Discharge Pressure Regulator). Carry out the connection work quickly to avoid letting air enter the tube.

• The hoses may be subject to internal pressure from the refrigerant inside the outdoor

CAUTION

unit. A Schrader-type push-to-release valve is provided at each connection port.

• Since the DPR valve opens at pressures of 2.5 MPa and above, be sure to connect the

DPR to the gas tube service port (low-pressure side).

Low-pressure outlet port (for ø7.94mm-dia connector)

High-pressure outlet port (for ø7.94mm-dia connector)

Liquid tube service port (for ø7.94mm-dia connector)

Manifold gauge

Lo Hi

DPR

Upper valve

Gas tube service port (for ø7.94mm-dia connector)

Lower valve

Fig. 7

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Mini VRF SYSTEM

2WAY SYSTEM

Outdoor Unit Repair Procedures

7. Charging Compressor Oil

6. Charging Compressor Oil

(1) Open the valve on the high-pressure side of the manifold gauge. (2) Open the upper valve. (3) Open the lower valve.

Process

Oil

charging

Oil charge completed

Refrigerant

recovery

(oil-charging

tank inside)

Hi-side

manifold

gauge

Open

Close*

Outdoor Unit Repair Procedures

Operating valve

Lo-side

manifold

gauge

(No connection)

Open

(Connect to

refrigerant

recovery tank)

Upper

valve

Open

Lower

valve

Open

Close after

approx. 60

seconds

Low-pressure outlet port (for ø7.94mm-dia connector)

High-pressure outlet port (for ø7.94mm-dia connector)

Liquid tube service port (for ø7.94mm-dia connector)

Manifold gauge Lo Hi

Connect from here to

refrigerant recovery unit

Gas tube service port (for ø7.94mm-dia connector)

(2) Upper valve

(1)

(3)

Lower valve

DPR

Fig. 8

Completing oil-charging

Refrigerant recovery (oil-charging tank inside)

NOTE

To determine the completion of refrigerant recovery, follow the instructions that came with the refrigerant recovery unit.

3 - 13

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2WAY SYSTEM

Outdoor Unit Repair Procedures

7. Charging Compressor Oil

Mini VRF SYSTEM

6. Charging Compressor Oil

Outdoor Unit Repair Procedures

6-2. If Outdoor Unit Has Not Been Charged with Refrigerant

When a compressor has been replaced or in any other case where the outdoor unit has not been charged with refrigerant, first charge with refrigerant then follow the instructions in “6-1. If Refrigerant Has Already Been Charged to Outdoor Unit” and charge with oil. Or, alternatively, follow the procedure below. (1) Connect a tube to the oil outlet port on the outdoor unit to be charged with oil. Insert the other end of the tube into

the oil container.

(2) Follow the instructions in “5. Evacuating System,” and apply vacuum to the outdoor unit to be charged with oil.

When this is done, oil is charged into the outdoor unit through the oil outlet port.

(3) When the unit has been charged with the designated amount of oil, stop the vacuum pump.

CAUTION

Vacuum pump

Oil

The oil absorbs moisture readily. This work must be completed quickly.

Low-pressure outlet port

Manifold gauge

Lo Hi

(for ø7.94mm-dia connector)

High-pressure outlet port (for ø7.94mm-dia connector)

Liquid tube service port (for ø7.94mm-dia connector)

Gas tube service port (for ø7.94mm-dia connector)

Fig. 9

6-3. Charging Additional Compressor Oil (after replacing compressor)

The rated amount of compressors as given below:

Rated Capacity Compressor model Q'ty Weight (OIL IN) [kg]

8HP 10HP

When replacing a faulty compressor, be sure to first measure the weight of the compressor. If the surplus oil is removed along with the compressor, add the same amount of new oil.

For example: Additional oil to be charged: 27.3 kg (removed compressor weight) – 27.1 kg (new compressor weight) = 0.2 kg ≒ 0.2 L

* If the result is a negative weight (removed compressor weight is less than the rated weight), it is not necessary

to discharge the extra oil from the system.

5JD650XDA22 5JD650XDA22

1 1

3 - 14

27.1

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Mini VRF SYSTEM

Pumping Out Refrigerant from Outdoor Unit

For the method used for additional oil charging after compressor replacement, see the section “6-1. If Refrigerant Has Already Been Charged to Outdoor Unit.”

Required equipment and tools: Jumper wire with clips, adjustable wrench, set of manifold gauge valves for the

refrigerant R410A, refrigerant recovery unit, pre-purged refrigerant cylinder for

recovery, flathead screwdriver, and outdoor unit maintenance remote controller. This work is performed in order to collect the refrigerant from an outdoor unit where repairs (other than compressor replacement) will be performed into other outdoor units and indoor units, and the refrigerant tubing.

7-1. If Remote Controller is Used for Maintenance of Outdoor Unit

(1) Connect the manifold gauge valves at the Lo side to the low-pressure outlet port of the outdoor unit.

Also connect the refrigerant recovery cylinder at the liquid tube service port (Schrader-type push-to-release valve). Perform the connection work quickly so that no air is allowed to enter them. (Fig. 10)

* Connecting the refrigerant recovery cylinder is done to prevent pressure from rising excessively during backup

operation by recovering the refrigerant from the outdoor unit to be repaired. (Measure the weight of the refrigerant and cylinder itself beforehand and provide sufficient safety measures, such as installing a high-pressure cutout in the circuit.)

Outdoor Unit Repair Procedures

The hoses may be subject to internal pressure from the refrigerant inside the out-

CAUTION

(2) Connect the outdoor unit maintenance remote controller to the CN-RC connector (3P) (BLU) on the outdoor

unit control PCB. Then start a test run of all units. (Press and hold the longer.)

(3) Use the outdoor unit maintenance remote controller to check the operating status of the indoor units. Check

that all units are operating in Heating mode. For details concerning operation of the outdoor unit maintenance remote controller, see the section “Outdoor unit maintenance remote controller”. It is also possible to check the operating conditions either in cooling or heating mode by touching the gas tube.

Cooling mode: low temperature (20℃ or lower) Heating mode: high temperature (60℃ or higher)

CAUTION

(4) Then slowly close the liquid tube service valve. (5) When the low pressure at the outdoor unit to be repaired reaches 0.5 MPa or below, press the ON/OFF button

on the outdoor unit maintenance remote controller to stop all the units. Then immediately fully close the gas tube valve on that outdoor unit.

door unit. Check that the manifold gauge valves are fully closed beforehand. A Schrader-type push-to-release valve is provided at each connection port.

(CHECK) button for 4 seconds or

The gas tubing becomes hot (60°C or higher) in heating. Be careful so as not to be burnt when touching the tubing.

While closing the valves, the rise in discharge temperature or another factor may

CAUTION

(6) Connect the high-pressure gauge side of the manifold gauge to the high-pressure outlet port on the outdoor

unit, and connect the manifold gauge to the refrigerant recovery device. Be sure that no air enters the tubing at this time.

cause a protective device to activate, stopping the operation of the outdoor unit. If this occurs, immediately fully close the gas tube valve on the outdoor unit to be repaired.

3 - 15

Page 74

Mini VRF SYSTEM

Pumping Out Refrigerant from Outdoor Unit

(7) Short-circuit the AP pin on the outdoor unit control PCB. Then turn ON the outdoor unit power.

When the AP pin is short-circuited and the power is turned ON, all solenoid valves

CAUTION

(8) Open both Hi- and Lo-side valves on the manifold gauge valves, and recover the refrigerant remaining in the

outdoor unit. Then measure the amount of recovered refrigerant.

NOTE

To determine the completion of refrigerant recovery, follow the instructions that came with the refrigerant recovery unit.

7-2. If Remote Controller is Not Available for Maintenance of Outdoor Unit

(1) Connect the manifold gauge valves at the Lo-side to the low-pressure outlet port of the outdoor unit.

* Connecting the refrigerant recovery cylinder is done to prevent pressure from rising excessively during the

in the outdoor unit are forced open, allowing the refrigerant to be recovered from all tubes which are separated by solenoid valves. If this work is not performed, it will not be possible to recover all of the refrigerant at the refrigerant recovery device. Be sure to perform this step.

Outdoor Unit Repair Procedures

The hoses may be subject to internal pressure from the refrigerant inside the out-

CAUTION

(2) Short-circuit the MODE pin ("HEAT" side) on the outdoor unit control PCB. (3) Short-circuit the CHK pin to start operation, leave the unit running for a while. Touch the gas tubing with fingers

to determine whether the unit is running in heating.

door unit. Check that the manifold gauge valves are fully closed beforehand. A Schrader-type push-to-release valve is provided at each connection port.

3 - 16

Page 75

Mini VRF SYSTEM

Pumping Out Refrigerant from Outdoor Unit

(4) Then slowly close the liquid tube service valve.

* When the low pressure at the outdoor unit to be repaired reaches 0.5 MPa or below, pull out the SCT connec-

tor from the outdoor unit control PCB of that outdoor unit. Then immediately fully close the gas tube valve on that outdoor unit.

* Pulling out the SCT connector immediately stops all of the outdoor units.

While closing the valves, the rise in discharge temperature or another factor may

CAUTION

(5) Connect the high-pressure gauge side of the manifold gauge to the high-pressure outlet port on the outdoor

unit, and connect the manifold gauge to the refrigerant recovery device. Be sure that no air enters the tubing at this time.

(6) Short-circuit the AP pin on the outdoor unit control PCB. Then turn ON the outdoor unit power.

cause a protective device to activate, stopping the operation of the outdoor unit. If this occurs, immediately fully close the gas tube valve on the outdoor unit to be repaired.

Outdoor Unit Repair Procedures

CAUTION

(7) Open both Hi- and Lo-side valves on the manifold gauge valves, and recover the refrigerant remaining in the

outdoor unit. After that, measure the amount of recovered refrigerant.

NOTE

To determine the completion of refrigerant recovery, follow the instructions that came with the refrigerant recovery unit.

When the AP pin is short-circuited and the power is turned ON, all solenoid valves in the outdoor unit are forced open, allowing the refrigerant to be recovered from all tubes which are separated by solenoid valves. If this work is not performed, it will not be possible to recover all of the refrigerant at the refrigerant recovery device. Be sure to perform this step.

Manifold gauge

Lo Hi

Connect from here to refrigerant recovery unit

Low-pressure outlet port (for ø7.94mm-dia connector)

High-pressure outlet port (for ø7.94mm-dia connector)

Indoor unit

Liquid tube service port (for ø7.94mm-dia connector)

Gas tube service port (for ø7.94mm-dia connector)

Refrigerant

recovery

cylinder

Measuring scale

Fig. 10

3 - 17

Page 76

8. Compressor

8-1. Compressor Trouble Diagnosis and Check Methods

Generally, compressor failures can be classified into the following categories. (1) Mechanical trouble (A) Locking (intrusion of foreign objects, galling, etc.)

(2) Electrical trouble (A) Coil burning

Trouble diagnosis is based on the following remote controller displays:

(B) Pressure rise failure (damaged valve, seal, bearing, or other component) (C) Noise (damaged stator rotor, valve, or other component)

(B) Open circuit (C) Insulation failure (D) Short circuit

CompressorDisplay

Mini VRF SYSTEM

Outdoor Unit Repair Procedures

[H03]

Compressor 1

(INV compressor)

A judgment is made based on factors that include the following:

Coil resistance (varies depending on the compressor), insulation resistance, current, leakage breaker operation, oil and refrigerant fouling, odor, pressure, and noise

Reference:

Insulation resistance (Use a DC 500 V insulation resistance meter and measure the insulation resistance

between the electrified and non-electrified parts.)

(a) Motor

Min. 300 M (b) Compressor Min. 100 M (servicing part) (c) Unit

Min. 10 M (This is due to the presence of refrigerant, which decreases

the insulation resistance.)

* Minimum insulation resistance as required by generally accepted requirements is 1 M

JUDGMENT START

Is there burning of the failed

compressor motor?

YES

Follow the instructions in

“2. Discharging Compressor Oil” and

drain the oil from all compressors in the

same system. Then inspect.

Follow the instructions in

“2. Discharging Compressor Oil”

and drain the oil from the failed

compressor. Then inspect.

Is the color phase 4.0 or above, or is a

YES

sharp odor present?

Are there 2 or more outdoor units where

the compressor oil color phase is 4.0 or

higher or where a sharp odor is

present?

YES

Follow the instructions in “8-2-2. Dry

core cleaning” and perform dry core

cleaning of all outdoor units.

Follow the instructions in “8-2-2. Dry core cleaning” and perform dry core cleaning of the

failed outdoor unit.

Reference: Symptoms of motor burning

1. Ground fault results in breaker operation.

2. Short circuit results in different coil resistance at different phases.

3. Open circuit

3 - 18

Go to “8-2-1. Replacing only the

failed compressor.”

Page 77

Mini VRF SYSTEM

8. Compressor

8-2. Replacing the Compressor(s) 8-2-1. Replacing compressor

(1) Follow the instructions in “8-3. Removing Compressor” and replace the failed compressor. (2) Fully close the high- and low-pressure gauge valves on the manifold gauge, then stop the vacuum pump. (3) Disconnect the manifold gauge from vacuum pump. Connect the manifold gauge to the cylinder where the

refrigerant was recovered. At this time, be careful that air does not enter the tubing.

(4) Open the valve on the refrigerant recovery cylinder and the high-pressure gauge valve on the manifold gauge to

charge with refrigerant. At this time, the low-pressure gauge valve on the manifold gauge remains fully closed.

If the recovered refrigerant becomes mixed with another refrigerant or another gas

CAUTION

(5) When charging has been completed with an amount of new refrigerant equal to the amount of recovered

refrigerant, or when charging with the same amount of new refrigerant has not been completed but no more refrigerant will enter the unit, fully close the high-pressure gauge valve on the manifold gauge. Next, turn the power OFF at the repaired outdoor unit, then remove the short circuit at the AP pin. Finally, fully open all valves on the gas tube and liquid tube.

(6) If charging with an amount of new refrigerant equal to the amount of recovered refrigerant was not possible,

fully close the high-pressure gauge valve on the manifold gauge. Then, while the unit is operating in “3-2-1. Cooling operation (for all units)”, open the low-pressure gauge valve on the manifold gauge and charge with the designated amount of refrigerant.

(such as nitrogen or air), do not use the recovered refrigerant for charging. Charge with the designated amount of new refrigerant.

Outdoor Unit Repair Procedures

CAUTION

(7) If necessary, follow the instructions in “6. Charging Compressor Oil,” and charge with oil. (8) Remove the manifold gauge.

CAUTION

When charging with liquid refrigerant, add refrigerant a little at a time in order to prevent liquid back-flow.

The connecting port employs a Schrader-type push-to-release valve. When disconnecting the hose, pressure will be applied from the refrigerant in the outdoor unit.

3 - 19

Page 78

Mini VRF SYSTEM

8. Compressor

8-2-2. Dry core cleaning

If burning or other failures occur repeatedly at compressors, in many cases the cause is acid, sludge, carbon, or other substances that remain in the refrigeration cycle as the result of insufficient cleaning. If, when the oil is inspected, there is an outdoor unit where the oil color phase is 4.0 or higher, or where a sharp odor is present, carry out all steps below to perform dry core cleaning. And use the bidirectional dry core for refrigerant R410A.

(A) If a ball valve is installed on the outdoor unit

(1) All units are operated in either Cooling or Heating mode. For Cooling operation, see the Section 3-2-1. For Heating operation, see the Section 7-1 and 7-2. (2) If all units are operated in Cooling mode, close the liquid tube service valve then the ball valve.

If all units are operated in Heating mode, close the ball valve then the liquid tube service valve. * This step is performed in order to expel refrigerant from the tubing between the liquid tube service valve and

the ball valve. Approximately 4 – 5 seconds is a sufficient interval between closing each of the 2 valves.

(3) Press the ON/OFF button on the outdoor unit maintenance remote controller to stop the operation of all units.

* If the outdoor unit maintenance remote controller is not available, use the following method to stop the oper-

ation of all units: Pull out the SCT connector from the outdoor unit control PCB. When the SCT connector is pulled out, alarm F12 (sensor trouble) immediately occurs and all outdoor units stop operating. Be sure that you do NOT grasp the lead wire when pulling out the connector. Removing any other connector may not cause the units to stop.

Therefore be sure to pull out only the SCT connector.

(4) Connect a refrigerant recovery device to the liquid tube service port (Schrader-type valve) of outdoor unit

where dry cores will be attached, then recover the refrigerant from the tubing. Be sure that no air enters the tubing at this time.

Outdoor Unit Repair Procedures

When the hose is connected, internal pressure is applied by the remaining refrigerant

CAUTION

(5) As shown in Fig. 11, disconnect the tube that runs from the liquid tube valve to the ball valve on outdoor unit

where dry cores will be attached. Then attach the dry cores.

(6) At outdoor unit where dry cores are attached, pressurize with 3.8 MPa of nitrogen from the liquid tube service

port and check for leaks.

(7) After evacuating all nitrogen gas from the tubing, apply vacuum from the liquid tube service port to outdoor

unit where dry cores are attached until the pressure is –101kPa {–755 mm Hg, 5 Torr} or less.

(8) Fully open the liquid tube valve and ball valve on all outdoor units where dry cores are attached. (9) Operate all units for approximately 3 hours (in either Heating or Cooling mode). (10) Follow the above procedure, and replace dry cores with new dry cores. (11) Operate all units for approximately 20 minutes (in either Heating or Cooling mode). (12)

Follow the instructions in “2. Discharging Compressor Oil” and drain a small amount of the oil from the oil separators

of outdoor unit where dry cores are attached. Check the color phase, odor, and other characteristics.

(13) If the results show that dry core cleaning is still necessary (for example, a color phase of 4.0 or higher)*, return

to Step 11 and repeat until the results return to normal (including a color phase of 3.5 or less)*. * Color sample sheet for degree of stain

CAUTION

in the inter-unit tubing. The connection port employs a Schrader-type valve. To determine when refrigerant recovery is complete, follow the instructions in the instruction manual of the refrigerant recovery device.

Perform another dry core replacement after approximately 30 hours of system operation.

(14) Perform steps (1) – (4), and remove all dry cores. Then connect the tubing between the liquid tube valves and

the ball valves.

(15)

At outdoor unit where dry cores were removed, pressurize with 3.8 MPa of nitrogen from the liquid tube service port

and check for leaks.

3 - 20

Page 79

Mini VRF SYSTEM

8. Compressor

(16) After evacuating all nitrogen gas from the tubing, apply vacuum to outdoor unit where dry cores were removed

until the pressure is –101kPa {–755 mm Hg, 5 Torr} or less.

(17) Refer to the Installation Instructions for further information. Charge with an amount of refrigerant equal to the

amount that was recovered.

(B) If a ball valve is not installed on the outdoor unit

(1) See the section “3-2-3. Refrigerant recovery procedures (2) : Indoor unit with no ball valve equipped”. Perform

pump down of the refrigerant from all indoor units and inter-unit tubing to the outdoor unit side.

(2) Cut the liquid tube at all outdoor units where dry cores will be attached, then attach the dry cores and ball

valves as shown in Fig. 11.

(3) For the next steps, see the steps (6) – (17) in

Cleaning dry core

on the previous page.

(A)

Outdoor Unit Repair Procedures

Dry core (bidirectional: for R410A refrigerant)

Liquid tube service port (for ø7.94mm-dia connector)

Gas tube service port (for ø7.94mm-dia connector)

Gas tube

Indoor unit

Ball valve

Fig. 11

3 - 21

Liquid tube

Indoor unit

Page 80

Mini VRF SYSTEM

2WAY SYSTEM

Outdoor Unit Repair Procedures

9. Compressor

8. Compressor

Outdoor Unit Repair Procedures

8-3. Removing Compressors

Use caution to prevent water or foreign particles from invading the refrigerant tube while removing and installing the compressor.

8-3-1. Removing Compressors

(1)

After recovering refrigerant in the system, replace the nitrogen gas through the service valve port.

(2)

Remove the insulator containing the compressor and heat insulating material surrounding the oil balance tube.

(3)

Remove the compressor terminal cap and then take out the supply terminal.

(4)

Remove the crankcase heater.

(5)

Remove the hexagonal nuts with washer from three locations.

(6)

Cut out the tube on the compressor side because the suction tube showing in the figure is rigid and unmovable.

(7)

Remove each welded part on the discharge side (one location) and on the oil balance tube (one location) showing in the figure.

(8) (9)

NOTE

Protect the sensor part, sheet-metal area, lubber, lead wire, clamper, etc.

Pull the compressor toward you. Remove the welded part on the suction side of the cut-out tube of the compressor side attached to the suction tube.

Suction tube

Suction side welded part

Tube of compressor side

Discharge side welded part (one location)

Compressor

Oil balance tube welded part (one location)

3 - 22

Page 81

Mini VRF SYSTEM

Contents

Outdoor Unit Maintenance Remote Controller

4. OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER

1. Overview .............................................................. 4-2

2. Functions ............................................................. 4-3

3. Ordinary Display Controls and Functions .................................. 4-4

4. Monitoring Operations .................................................. 4-9

5. Outdoor Unit Alarm History Monitor ...................................... 4-11

6. Mode Settings ........................................................ 4-12

4 - 1

Page 82

1. Overview

Mini VRF SYSTEM

Outdoor Unit Maintenance Remote Controller

OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER (CZ-RTC4) for 2WAY VRF

About the outdoor unit maintenance remote controller

The outdoor unit utilizes nonvolatile memory (EEPROM) on its PCB. This allows EEPROM data to replace the setting switches that were present on previous PCBs. The outdoor unit maintenance remote controller is used to set and change these EEPROM data. In addition to setting and checking the outdoor unit EEPROM data, this remote controller can also be used to monitor the outdoor unit alarm history, monitor the various indoor and outdoor temperatures, and check the indoor unit connection status (number of units, operating mode, etc.).

NOTE

Outdoor unit maintenance remote controller does not function as an ordinary remote controller. It is therefore only used for test runs and during servicing.

System diagram

Outdoor unit maintenance

remote controller

Special service checker wiring

(Servicing No.: CV6231785082)

Outdoor unit

[Service Checker Section]

CZ-RTC4

Inter-unit control wiring

Interface for outdoor unit maintenance

Operation manual included in package.

The special service checker wiring is required in order to connect the outdoor unit maintenance remote controller

Remote controller Ass’y

remote controller (Servicing No.: CV6231616171)

Outdoor unit control PCB

Indoor

unit

Remote

controller

Indoor

unit

Remote

controller

to the outdoor unit PCB.

Ordinary remote controllers or other controller are still required for the indoor units, even when the outdoor unit

maintenance remote controller is connected.

4 - 2

Page 83

Mini VRF SYSTEM

2. Functions

Functions on the ordinary display

(1) Functions: Button operations can be used to perform the following functions.

• Start/stop of all indoor units

• Switching between cooling and heating

• Test run of all indoor units

• Double-speed operation of indoor units (Do not use for actual operation. Doing so may damage the devices.)

(2) Display: The following can be displayed.

• Alarm details display

• No. of indoor/outdoor units

• Unit Nos. of connected indoor/outdoor units

• Indoor/outdoor unit operating status (blinks when an alarm occurs)

• Indoor unit thermostat ON

• Display of individual outdoor unit alarms

• Total operating time of outdoor unit compressors

• Oil level of the outdoor unit oil sensor

• Total outdoor unit power ON time

• Outdoor unit microcomputer version, other information

Outdoor Unit Maintenance Remote Controller

Temperature monitor

• Displays the indoor/outdoor unit sensor temperatures.

Outdoor unit alarm history monitor

• Displays the outdoor unit alarm history.

Mode settings

• Setting mode 1 and setting mode 2 are used to make the outdoor EEPROM setting.

4 - 3

Page 84

3. Ordinary Display Controls and Functions



Functions on the ordinary display

•

Connect the special service checker wiring to the outdoor unit PCB. The connection is shown in the figure below.

Mini VRF SYSTEM

Outdoor Unit Maintenance Remote Controller

When connecting the special service checker wiring to the remote controller CZ-RTC4, cut out the wire as shown in the figure below because the connector of the remote controller cannot be used directly.

Top case (Back side)

CZ-RTC4 (2P, WHT)

If the communications line in the inter-unit control wiring is connected, it can be left as-is.

In case of an independent outdoor unit (1 maintenance remote controller connected to 1 outdoor unit, auto

Special service checker wiring

CUT

Terminal board

6 mm Remove the coating. Approx. 6 mm

Relay connector (2P, WHT)

PCB connector (3P, BLU)

Bottom case (Back side)

RC (3P, BLU)

Outdoor unit PCB

address setting for indoor units not completed), both setting mode 1 and setting mode 2 can be used.

The overall system status for that refrigerant system is displayed.

4 - 4

Page 85

3. Ordinary Display Controls and Functions

All units start/stop

The (Start/Stop operation) button can be used

to start and stop all the indoor units.

• The LED illuminates if any indoor units is operating.

• The LED blinks if an alarm at any of the operating indoor

units occurs.

Cooling/heating change

NOTE

Cooling and heating mode changes are only available

when all indoor units are stopped.

The

(Mode) button can be used to change

between heating and cooling operation.

Mini VRF SYSTEM

Outdoor Unit Maintenance Remote Controller

LED

• The display indicates the operating mode of the indoor

unit with the lowest unit No.

All units test run <Operation> The (Check) button can be used to start and stop a

test run for all indoor units.

• Press and hold for 4 seconds to turn ON.

During the test run “

” is displayed.

• The status of test runs performed from the indoor unit

remote controller is not displayed on the outdoor unit maintenance remote controller.

Double-speed

• Do not use for actual operation.

(Doing so may damage the devices.)

<Operation> The timer button

can be used to change between

double-speed and normal operation.

• During double-speed operation, the Sleeping Mode

mark is displayed.

4 - 5

Page 86

3. Ordinary Display Controls and Functions

Display (functions)

Use the temperature setting and buttons to change the item code.

•

Outdoor Unit Maintenance Remote Controller

Mini VRF SYSTEM

Item code

Item Remarks

Outdoor unit alarm Alarm code display

No. of connected indoor units Quantity

Unit Nos. of connected indoor unit 7-segment display

Operating status of indoor unit 7-segment display

Thermostat ON status of indoor unit 7-segment display

No. of connected outdoor units 1 – 4

Unit Nos. of connected outdoor units 7-segment display

Operating status of outdoor unit compressor 7-segment display

Compressor 1 operating time 0 – 99999999 hours

Compressor 1 oil level 0 = Empty 1 = Insufcient 2 = Sufcient

Outdoor unit power ON time 0 – 99999999 hours

Compressor 1 operation count 0 – 65535 times

Alarm history 1 (most recent)

Alarm history 2

Alarm history 3

Alarm history 4

Alarm history 5

Alarm history 6

Alarm history 7

Alarm history 8 (oldest)

Firmware version Display the version No. × 100.

Program version Display the version No. × 100.

and Á correspond to Fig. 1 on the next page.

Display only. Alarm code and unit No. of unit

where alarm occurred are displayed alternately.

0 = CCU

1 – 4 = Outdoor unit

4 - 6

Page 87

3. Ordinary Display Controls and Functions

XX-YY R.C.

Displays the outdoor unit sub-bus address which is

currently selected. XX = Outdoor system address on main bus line (1 – 30)

YY = Outdoor unit sub-bus address (1 – 8) “1” appears when there is only 1 outdoor unit.

Mini VRF SYSTEM

Outdoor Unit Maintenance Remote Controller

Locations where

shown in Fig. 1.

, and Â are displayed as

À, Á

01: <No. of connected indoor units>

4 units connected

LED

Fig. 1

02: <Unit Nos. 1, 2, 3 and 4 are

connected>

4 - 7

Page 88

3. Ordinary Display Controls and Functions

Concerning the 7-segment, 4-digit display remote controller timer display

Outdoor Unit Maintenance Remote Controller

The unit Nos. of connected units are indicated by four 7-segment digits (

Display of unit Nos. 1 − 20

Mini VRF SYSTEM

) and a colon.

OFF OFF OFF OFF

3 13 188

2 7 12 17

5 10 15 20

6 11 16

4 14 199

Meaning of display colon

1 ~ 20 21 ~ 40 41 ~ 60 61 ~ 80

ON ON ON ON

is not displayed.

Display of unit Nos. 21 − 40

OFF OFF OFF OFF

23 33 3828

22 27 32 37

26 31 36

24 34 3929

25 30 35 40

Meaning of display colon

1 ~ 20

21 ~ 40

ON ON ON ON

The meaning of the colon changes in the same way to indicate unit Nos. up to 80.

Sample displays of the connected indoor unit Nos.:

•

Display of unit No. 1

•

Display of unit Nos. 1 and 2

41 ~ 60 61 ~ 80

•

Display of unit Nos. 1, 2, and 3

•

Display of unit Nos. 1, 2, 3, and 4

NOTE

The change of the colon display (between unit Nos. 1-20 to unit Nos. 21-40) occurs automatically every 10 seconds. (However the display does not change if there are no higher-number units connected.) To change the display to the higher-number units before 10 seconds have passed, press the (Flap) button.

The total compressor operating time is displayed

(B)(A)

(in 1-hour units) using 8 digits.

• When the rst 4 digits are displayed, the top

dot of the colon is illuminated. (Figure (A))

• When the last 4 digits are displayed, the colon

dot is OFF. (Figure (B))

• The display of the rst 4 digits and last 4 digits

changes automatically after 10 seconds. The display

can also be changed by pressing the button.

(Flap)

10: <Compressor’s total operating time>

(A) and (B) are displayed alternately. (The example here (0000, 0062) indicates 62 hours.)

NOTE

With the outdoor unit maintenance remote controller (when connected to the outdoor unit), the unit remote controller check functions will not operate.

4 - 8

Page 89

4. Monitoring Operations

Display the indoor unit and outdoor unit sensor

temperatures.

Press and hold the (Check) button and

buttons simultaneously for 4 seconds or longer to engage temperature monitor mode.

Mini VRF SYSTEM

Outdoor Unit Maintenance Remote Controller

During temperature monitoring,

(The display and operations are the same as

for monitor mode using the indoor unit remote controller.)

Press the button and select the indoor unit to

monitor.

Press the temperature setting and buttons

and select the item code of the temperature to monitor.

The unit No. of the selected indoor unit, and the

temperature data, are displayed.

To end monitoring, press the (Check) button.

The display returns to the normal display.

NOTE

The display does not blink.

is illuminates.

4 - 9

Page 90

4. Monitoring Operations

Display of unit No. 1 (main unit)

Indoor unit intake temp. (TA)

Indoor unit heat exchanger temp. E1 (E1)

—

Indoor unit heat exchanger temp. E3 (E3) Indoor unit

Discharge air temp. (BL)

Discharge air temp. setting

Indoor unit MOV pulse (MOV) STEP

Discharge temp. (DISCH)

High-pressure sensor temp.

Heat exchanger gas (EXG)

Heat exchanger liquid (EXL)

Outdoor air temp. (TO)

Inverter secondary current

Inverter primary current (L2 phase)

—

Inverter actual operating frequency

Inverter primary current (L1 phase)

Low-pressure sensor temp.

Suction temp. (SCT)

Detected oil temp. (OIL)

Inverter primary current (L3 phase)

Mini VRF SYSTEM

Outdoor Unit Maintenance Remote Controller

RemarksDescriptionDN

°C

STEPMOV pulse 1 (MOV1)

STEPMOV pulse 2 (MOV2)

°C

Outdoor unit

NOTE

0A and subsequent items are outdoor unit data. It takes about 10-second long until outdoor unit data appears or changes on the display.

4 - 10

Page 91

5. Outdoor Unit Alarm History Monitor

•

Displays outdoor unit alarms only.

•

Check the indoor unit alarm histories separately using the

indoor unit remote controllers or other control device.

Mini VRF SYSTEM

Outdoor Unit Maintenance Remote Controller

Press and hold the (Check) button and

button simultaneously for 4 seconds or longer to engage outdoor unit alarm history mode.

During temperature monitoring,

The display and operations are the same as for the

alarm history monitor performed from the indoor unit

remote controller. However the “UNIT No.” display shows

the outdoor unit address.

Press the button and select the outdoor unit for

which to monitor the alarm history.

Press the temperature setting and buttons and

select the item code for the alarm history.

The select outdoor unit address, the item code, and the

alarm history (alarm data) are displayed.

The outdoor unit address is displayed as R.C. XX-YY.

System XX = Outdoor unit system address R.C. XX = Outdoor unit system address YY = Outdoor unit sub-bus address

Item codes 01-08 are displayed. 01 indicates the most

recent alarm.

illuminates.

The alarm history displays the alarm code. (If no alarm

are present, then -- -- is displayed.)

To clear the alarm history, press the button. (The

outdoor unit alarm history will be cleared.)

To exit, press the (Check) button. The display

returns to the normal display.

4 - 11

Page 92

2WAY SYSTEM

Outdoor Unit Maintenance Remote Controller

6. Mode Settings

Setting mode 1

Mini VRF SYSTEM

Outdoor Unit Maintenance Remote Controller

Display of ﬁ rst 3 digits

Press and hold the 1

(Ventilation) button simultaneously for 4

seconds or longer.

Press the temperature setting and buttons to change the item code. The item codes and setting data are shown in the table below.

Press the timer time buttons to

change the setting data.

To confirm the changed setting data, press the

button.

(At this time, “ ” display stops blinking and remains lit.)

During this mode, “ ” is displayed, blinking. The outdoor unit address display section displays “ALL,” the item code and number (DN value in the table), and the setting data (6 digits).

(The setting data is displayed in 6 digits. The display changes between the first 3 digits (Fig. and the last 3 digits (Fig.

When the first 3 digits are displayed, the bottom dot of the colon is illuminated.)

To exit the setting mode, press the (Check)

button.

(Check) button and

and

)

Display of last 3 digits

and are displayed alternately.

(Example shows display of 000 001.)

Regarding the parameter setting, see the item "11. Detailed Settings in EEPROM of Outdoor Unit" under the Section 1.

4 - 12

Page 93

Mini VRF SYSTEM

Contents

Remote Controller Functions

5. REMOTE CONTROLLER FUNCTIONS

1. Simple Settings Function ................................................ 5-2

2. Detailed Settings Function ............................................... 5-8

3. Remote Controller Servicing Functions ................................... 5-21

5 - 1

Page 94

1. Simple Settings Function

Press and hold the and buttons simultaneously for 4 seconds or longer.

“ ”, unit No.“ ” (or “” in the case of group control), item code “ ”, and settings data “” are displayed blinking on the remote controller LCD display. At this time, the indoor unit fan (or all indoor unit fans in the case of group control) begins operating.

If group control is in effect, press the select the address (unit No.) of the indoor unit to set.

button and

At this time, the fan at the indoor unit begins operating.

*If unit No.“ ” is displayed, the same setting

will be made for all indoor units.

Press the temperature setting / select the item code to change.

buttons to

Press the timer time / buttons to select the

desired setting data.

*For item codes and setting data, see the following

page.

Press the button. (The display stops blinking

and remains lit, and setting is completed.)

Press the button to return to normal remote

controller display.

CZ-RTC4

17 6

•

This allows the filter lifetime, operating mode priority change, central control address, and other settings to be made for an individual or groupcontrol indoor unit to which the remote controller used for simple settings is connected.

When simple settings mode is engaged, operation stops at the individual or group-control indoor unit to which the remote controller for simple settings is connected.

Keep pressing the , and

buttonssimultaneously for 4 or more seconds. The “Maintenance func” screen appears on the LCD display.

Press the or button to see each

menu. If you wish to see the next screen instantly, press the or button. Select “7. Simple settings” on the LCD display and press the button.

Maintenance func

1. Outdoor unit error data

2. Service contact

3. RC setting mode

4.Test run Sel. Page [ ] Confirm

Maintenance func

5. Sensor info.

6. Servicing check

7. Simple settings

8. Detailed settings Sel. Page [ ] Confirm

The “Simple settings” screen appears on the LCD display. Select the “Unit no.” by pressing the or

button for changes.

Simple settings

Unit no. Code no. Set data

3-1 0001

Sel. Next

Select the “Code no.” by pressing the or

button.

Change the “Code no.” by pressing the or

button.

20:30 (THU)

Mini VRF SYSTEM

Remote Controller Functions

20:30 (THU)

[ ]

START

Select the “Set data” by pressing the or

button. Select one of the “Set data” by pressing the or button. Then press the button.

Simple settings

Unit no. Code no. Set data

3-1

Sel.

Select the “Unit no.” by pressing the or

button and press the button. The “Exit simple settings and restart?” (Simple setting-end) screen appears on the LCD display. Select “YES” and press the button.

Simple settings

Unit no. Code no. Set data

ALL

Sel. Next

01 0002

[ ] Confirm

Exit simple settings

and restart?

01 0002

NOYES

CZ-RTC5

20:30 (THU)

Simple settings

Unit no. Code no. Set data

Sel. Next

20:30 (THU)

10001-3

5 - 2

Page 95

1. Simple Settings Function

Press and hold the and buttons

simultaneously for 4 seconds or longer.

“ ”, unit No.“ ” (or “” in the case

of group control), item code “ ”, and settings data “” are displayed blinking on the remote controller LCD display. At this time, the indoor unit fan (or all indoor unit fans in the case of group control) begins operating.

If group control is in effect, press the

select the address (unit No.) of the indoor unit to set. At this time, the fan at the indoor unit begins operating.

*If unit No.“ ” is displayed, the same setting

will be made for all indoor units.

Press the temperature setting /

select the item code to change.

Press the timer time / buttons to select the

desired setting data.

*For item codes and setting data, see the following

page.

button and

buttons to

Mini VRF SYSTEM

Remote Controller Functions

CZ-RTC4

17 6

Press the button. (The display stops blinking

and remains lit, and setting is completed.)

Press the button to return to normal remote

controller display.

5 - 3

Page 96

1. Simple Settings Function

List of Simple Setting Items

Item code Item

Filter sign ON time

(ﬁlter life time)

Degree of ﬁlter fouling

Central control

address

Operating mode

priority change

Fan speed when

heating thermostat is

OFF

Heating intake

temperature shift

(0B)

(0D)

Electric heater

installation

Humidifying when

heater thermostat is

OFF

Change to remote

controller sensor

thermostat differential

Function of EXCT

plug short-circuit

Permit/prohibit

automatic

heating/cooling

Cool-only

Mini VRF SYSTEM

Remote Controller Functions

Setting data

No. Description

0000 Not displayed 0001 150 hours 0002 2,500 hours 0003 5,000 hours 0004 10,000 hours 0005 Use the ﬁlter clogging sensor. 0000 Standard (setting at time of shipping)

Highly fouled

0001

(Filter sign ON time is reduced to one-half the set time.) 0001 Central control address 1 0002 Central control address 2

0003 Central control address 3

0064 Central control address 64 0099 No central control address set (setting at time of shipping) 0000 Normal (setting at time of shipping) 0001 Priority

Compressor ON Compressor OFF 0000 L 1 min., LL 3 min. LL 0001 L LL 0002 LL LL 0004 L 1 min., LL 3 min. L 0005 L L 0006 LL L 0000 No shift 0001 Shifts intake temperature 1°C down. 0002 Shifts intake temperature 2°C down. 0003 Shifts intake temperature 3°C down. 0004 Shifts intake temperature 4°C down. 0005 Shifts intake temperature 5°C down.

0006 Shifts intake temperature 6°C down. 0000 No heater

0001 Heater installed

0000 No (setting at time of shipping)

0001 Ye s

0000 Thermostat OFF differential: − 1°C (setting at time of shipping)

0001 Thermostat OFF differential: − 0.5°C

0000 Indoor unit does thermostat OFF (factory preset mode)

0001 Indoor unit gives “P14” alarm and transmits the refrigerant leakage signal.

0000 Permit

0001 Prohibit

0000 Normal 0001 Cool only (Set “1” for item code OD.)

NOTE

• In order to avoid water leakage and damage to the fan, do not set for humidifying when the thermostat is OFF unless a vaporizing humidifier is used.

• Consider the device purpose and type when changing the settings. Incorrect settings may result in malfunction.

• Do not change any setting data that does not appear in this list.

5 - 4

Page 97

1. Simple Settings Function

Simple setting items

Item code Item Description

Filter sign ON time setting (ﬁlter lifetime)

Changes the indoor unit ﬁlter lifetime when a high-performance ﬁlter or other optional product is installed.

Mini VRF SYSTEM

Remote Controller Functions

02 Degree of ﬁlter fouling

Reduces the ﬁlter sign ON time to 1/2 of the standard time (setting at the time of shipping) for cases when ﬁlter fouling is more severe than normal.

Filter sign ON times for each model

Filter sign ON time

Model

data

4-Way cassette (U1)

0001

4-Way cassette 60×60 (Y2)

0002 2-Way cassette (L1) × × 2500 1250

0003 1-Way cassette (D1) × × 2500 1250

Low Silhouette Ducted (F2)

0005

Slim Low Static Ducted (M1)

0006 High Static Pressure Ducted (E2) × × × ×

0007 Ceiling (T2) × × 1500 750

0008 Wall Mounted (K1, K2) 150 75 × ×

Model

Standard Long-life

Standard High fouling Standard High fouling

× × 2500 1250

× × × ×

0010 Floor Standing (P1) 150 75 × ×

0011 Concealed Floor Standing (R1) 150 75 × ×

Unit: hour

NOTE

•

indicates that there is no corresponding filter.

150

•

indicates the filter sign ON time that is set at shipment.

• High fouling: Set when

is selected for the degree of filter fouling (item code ).

5 - 5

Page 98

Mini VRF SYSTEM

1. Simple Settings Function

Item code Item Description

Set when using a central control device.

03 Central control address

04 Operating mode priority change Note (1)

NOTE

(1) Explanation of operation mode priority change

Enabled only in 2WAY System heat-pump models.

With indoor units that are installed in combination with an outdoor unit model where either heating or cooling operation can be selected, the operating mode of the indoor unit that starts first takes priority. The first indoor unit to operate can select any operating mode. When any mode other than fan mode is selected, then the operating modes that cannot be selected are not displayed on all remote controllers that are subsequently operated. “Operation change control in progress” is displayed, indicating that there are restrictions on the operating modes that can be selected.

Used when setting the central control address manually from the remote controller.

Remote Controller Functions

•

Controlling the operating mode from a specific remote controller

- When there are multiple remote controllers in the same refrigerant system, it is possible to set one remote controller as the priority remote controller (the remote controller which is given priority for selecting the operating mode). (If 2 or more remote controllers are set as priority remote controllers, an alarm will occur at the remote controllers, and operation will not be possible.)

- When the priority remote controller is set to the operating mode for control, then all other remote controllers can select only the permitted operating mode, regardless of whether the priority remote controller is operating or stopped.

- When a controlled remote controller is operated, “Operation change control in progress” is displayed.

Set mode at priority remote controller Modes that can be selected at other remote controllers

Cooling or dry Cooling, dry, fan Heating Heating, fan

Fan Whichever mode (heating/cooling) is selected ﬁrst

NOTE

There are other methods to avoid control in which the mode selected first takes priority.

Methods of remotely controlling the operating mode

(1) Use the central functions of a central control device.

(2) Use a remote control relay PCB at the outdoor unit.

5 - 6

Page 99

Mini VRF SYSTEM

1. Simple Settings Function

When the operating mode at the priority remote controller is changed, the operating modes of other remote controllers change as shown below.

Mode change at priority remote controller Operating modes at other remote controllers

Current mode New mode Current mode New mode

Cooling or dry Heating

Heating Cooling

Cooling Dry

Heating Dry

Cooling or dry Fan

Heating Fan

Cooling or dry Heating

Fan Fan (not changed)

Heating Cooling

Fan Fan (not changed)

Cooling Cooling (not changed)

Dry Dry (not changed)

Heating Cooling

Fan Fan (not changed)

Cooling Cooling (not changed)

Dry Dry (not changed)

Fan Fan (not changed)

Heating Heating (not changed)

Fan Fan (not changed)

Remote Controller Functions

Item code Item Description

07 Electric heater installation

0F Cooling-only

Fan speed setting when heating thermostat is OFF

Heating intake temperature shift

Humidifying when heater thermostat is OFF

Permit/prohibit automatic heating/cooling

Changes the fan speed setting when the heating thermostat is OFF.

Shifts the intake temperature during heating. Can be set when the body thermostat is used.

Set when cost distribution is performed using an AMY central control system or similar system, and when an optional electric heater is installed. (This is unrelated to control of the electric heater.)

Normally humidifying does not occur when the thermostat is OFF during heating operation. However, this setting can be changed in order to increase the amount of humidifying. Caution: In order to avoid water leakage and damage to the fan, do not use this setting unless a vaporizing humidiﬁer is used.

This setting can be used to prevent the automatic heating/cooling display on the remote control if the unit conﬁguration permits automatic heating/cooling operation.

This setting allows a heat pump indoor unit to be operated as a cooling-only unit.

5 - 7

Page 100

2. Detailed Settings Function

Press and hold the and , buttons simultaneously for 4 seconds or longer.

“ ”, unit No. “ ”, item code “ ”, and settings data “” are displayed blinking on the

remote controller LCD display. At this time, the indoor unit fan begins operating.

If group control is in effect, press the select the address (unit No.) of the indoor unit to set. At this time, the fan at the indoor unit begins operating.

button and

*If unit No. “” is displayed, the same setting

will be made for all indoor units.

Press the temperature setting / select the item code to change.

buttons to

Press the timer time / buttons to select the

desired setting data.

*For item codes and setting data, see the following

page.

Press the button. (The display stops blinking and remains lit, and setting is completed.)

Press the button to return to normal remote controller display.

CZ-RTC4

7 6

•

This allows the system address, indoor unit address, and other settings to be made for the individual or group-control indoor unit to which the remote controller used for detailed settings is connected.

When detailed settings mode is engaged, operation stops at the individual or group-control indoor unit where the remote controller used for detailed settings is connected. Simple settings items can also be set at this time.

Keep pressing the , and

buttonssimultaneously for 4 or more seconds. The “Maintenance func” screen appears on the LCD display.

Press the or button to see each

menu. If you wish to see the next screen instantly, press the or button. Select “8. Detailed settings” on the LCD display and press the button.

Maintenance func

1. Outdoor unit error data

2. Service contact

3. RC setting mode

4.Test run Sel. Page [ ] Confirm

Maintenance func

5. Sensor info.

6. Servicing check

7. Simple settings

8. Detailed settings

Sel. Page [ ] Confirm

20:30 (THU)

The “Detailed settings” screen appears on the LCD display. Select the “Unit no.” by pressing the or

button for changes.

Detailed settings

Unit no. Code no. Set data

3-1 0001

Sel. Next

Select the “Code no.” by pressing the or

button.

Change the “Code no.” by pressing the or

button (or keeping it pressed).

20:30 (THU)

Mini VRF SYSTEM

Remote Controller Functions

20:30 (THU)

[ ]

START

Select the “Set data” by pressing the or

button. Select one of the “Set data” by pressing the or button. Then press the button.

Select the “Unit no.” by pressing the or

button and press the button. The “Exit detailed settings and restart?” (Detailed setting-end) screen appears on the LCD display. Select “YES” and press the button.

Detailed settings

Unit no. Code no. Set data

3-1

[ ] Confirm

Sel.

Detailed settings

Exit detailed settings

Unit no. Code no. Set data

and restart?

ALL

Sel. Next

20:30 (THU)

10 0001

20:30 (THU)

01 0002

NOYES

CZ-RTC5

Detailed settings

Unit no. Code no. Set data

3-1 0001

Sel. Next

20:30 (THU)

5 - 8

panasonic SBPAC1605017CE Datasheet

Check of Density Limit

Precautions for Installation Using New Refrigerant

Important Information Regarding The Refrigerant Used

CONTENTS

1. CONTROL FUNCTIONS - Outdoor unit

1. Introduction

2. Compressor Control

3. Special Control

4. Outdoor Unit Fan Control

6. Oil Control

7. 4-Way Valve Adjustment Control

8. Defrost Control

9. Demand Control

10. Other Functions

11. Detailed Settings in EEPROM of Outdoor Unit

12. Outdoor Unit Control PCB

13. Electrical Data

2. CONTROL FUNCTIONS - Indoor Unit

1. Room Temperature Control

2. Heating Standby

3. Automatic Fan Speed Control

4. Indoor Unit MOV Control

5. Drain Pump Control

6. Automatic Heating / Cooling Control

7. Discharge Air Temperature Control

8. RAP Valve Kit Control

9. Automatic Flap Control

10. Filter Sign

11. Fan Control during Dry Mode

12. Ventilation Fan Output

13. T10 Terminal

14. Parameter

3. OUTDOOR UNIT REPAIR PROCEDURES

1. Removing Panels

2. Discharging Compressor Oil

3. Recovering Refrigerant

4. Checking for Leakage After Repair

5. Evacuating System

6. Charging Compressor Oil

Pumping Out Refrigerant from Outdoor Unit

8. Compressor

4. OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER

1. Overview

2. Functions

3. Ordinary Display Controls and Functions

4. Monitoring Operations

5. Outdoor Unit Alarm History Monitor

5. REMOTE CONTROLLER FUNCTIONS

1. Simple Settings Function

2. Detailed Settings Function