Sanyo CHDXR09663, CHDX07263, CHDX09663, CHDXR07263 User Manual

SERVICE MANUAL

2-WAY ECO-i

CHDX07263 CHDXR07263 CHDX09663 CHDXR09663**

Outdoor Units

ECO-i W-2WAY

Refrigerant R410A is used in the outdoor units. * Salt-Air Damage Resistant Specifications.

Indoor Units

4-Way Air Discharge

Semi-Concealed 4-Way Air Discharge

Mini Semi-Concealed 1-Way Air Discharge

Semi-Concealed

Concealed Duct Type

Slim Concealed

Duct Type Concealed-Duct High

Static Pressure

Ceiling-Mounted

CHDX07263 CHDXR07263

AHX0752

UHX0762

UMHX0762

9Class

AHX0952

UHX0962

UMHX0962

9672Class

CHDX09663 CHDXR09663

12 15 18 2419 36 48 54

XHX1252

XMHX1252

AHX1252

UHX1262

UMHX1262

THX1252

UHX1562

UMHX1562

XHX1852

XMHX1852

UHX1862

UMHX1862

THX1852

MULTI SYSTE

XHX2452

UHX2462 UHX3662 UHX4862 UHX5462

THX2452

XHX3652

DHX4852DHX3652

Wall-Mounted Type

Floor-Standing Type

Concealed-Floor

Standing Type

Necessary to install the External Electronic Expansion Valve Kit (Optional:ATK-SVRK56BA).

85464849280000

KHX0752 KHX0952

FHX0762 FHX0962

FMHX0762

FMHX0962

KHX1252

FHX1262

FMHX1262

FHX1562

FMHX1562

KHX1962KHX1862

FHX1862

FMHX1862

KHX2452

FHX2462

FMHX2462

REFERENCE NO.

SM830180-00

Please Read Before Starting

This air conditioning system meets strict safety and operating standards. As the installer or service person, it is an important part of your job to install or service the system so it operates safely and efficiently.

Carefully read this instruction booklet before beginning. Follow each installation or repair step exactly as shown. Observe all local, state, and national electrical codes.

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

In Case of Improper Installation

When Wiring

ELECTRICAL SHOCK CAN CAUS 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.

•

When Installing…

…In a Room

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

…In Moist or Uneven Locations

…

…In a Snowy Area (for Heat Pump-type Systems)

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

•

• Keep all tubing runs as short as possible.

• Use the flare method for connecting tubing.

• 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.

When Servicing

•

• Keep your fingers and clothing away from any moving

parts.

•

• 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 poisonous gas.

IMPORTANT!

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

Pay close attention to all warning and caution notices given in this manual.

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

WARNING

CAUTION

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.

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

Ground the unit following local electrical codes.

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

When Transporting

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.

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.

When Connecting Refrigerant Tubing

Ventilate the room well, 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 poisonous gas.

Turn the power OFF at the main power box (mains) before opening the unit to check or repair electrical parts and wiring.

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

CAUTION

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

•

Check of Density Limit

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 airconditioner, 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 off loor 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).

ASHRAE and the International Mechanical Code of the ICC as well as CSA provide guidance and define safeguards related to the use of refrigerants, all of which define a Refrigerant Concentration Level (RCL) of 25 pounds per 1,000 cubic feet for R410A refrigerant. For additional guidance and precautions related to refrigerant safety, please refer to the following documents:

International Mechanical Code 2009 (IMC-2009) (or more recently revised)

ASHRAE 15 ASHRAE 34

—

CONTENTS

—

Section 1: CONTROL FUNCTIONS .......................................... 1-1

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

2. Selecting Outdoor Unit for Operation ......................................... 1-3

3. Compressor Control ...................................................... 1-4

4. Special Controls ......................................................... 1-9

5. Other Controls .......................................................... 1-14

6. Operation of Solenoid Valves .............................................. 1-15

7. Outdoor Unit Electronic Thermostatic Expansion Valves [MOV1, MOV2 & MOV4] ..... 1-17

8. Outdoor Fan Control ..................................................... 1-19

9. Demand Control ........................................................ 1-20

10. Indoor Unit Control of the Electronic Control Valve .............................. 1-21

11. Rap Valve Kit Control .................................................... 1-23

12. Indoor Unit Refrigerant Oil Self Recovery Control .............................. 1-24

13. Discharge Temperature ................................................... 1-25

14. Current Protection ....................................................... 1-26

15. Pressure Sensor Failure .................................................. 1-27

16. Backup Operation ....................................................... 1-28

17. Service Maintenance Functions ............................................ 1-30

18. Other Functions ........................................................ 1-32

Section 2: OUTDOOR UNIT REPAIR PROCEDURES ........................... 2-1

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

2. Removing Electrical Component Box and Duct ................................. 2-3

3. Discharging Compressor Oil ................................................ 2-5

4. Backup Operation ........................................................ 2-6

5. Recovering Refrigerant .................................................... 2-9

6. Checking for Leakage After Repair .......................................... 2-14

7. Evacuating System ...................................................... 2-15

8. Charging Compressor Oil ................................................. 2-16

9. Pumping Out Refrigerant from Outdoor Unit ................................... 2-20

10. Compressor ........................................................... 2-23

11. High and Low Pressure Sensors ........................................... 2-35

12. Replacing 4-way Valve ................................................... 2-36

Section 3: OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER ............ 3-1

1. Overview ............................................................... 3-2

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

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

4. Monitoring Operations ..................................................... 3-9

5. Outdoor Unit Alarm History Monitor ......................................... 3-11

6. Mode Settings .......................................................... 3-12

Section 4: REMOTE CONTROLLER FUNCTIONS ............................. 4-1

1. Simple Settings Function ................................................... 4-2

2. Detailed Settings Function .................................................. 4-4

3. Remote Controller Servicing Functions ....................................... 4-15

iii

Section 5: TROUBLE DIAGNOSIS .......................................... 5-1

1. Contents of Remote Controller Switch Alarm Display .............................5-2

2. Outdoor Unit Control Panel LED Display ...................................... 5-4

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

4. W-2WAY ECO-i Alarm Codes ............................................... 5-7

5. Blinking Inspection Display on the Remote Controller ........................... 5-27

6. Inspection of Parts ...................................................... 5-28

7. Test Pin ............................................................... 5-29

8. Thermister Characteristics Curve ........................................... 5-30

W-2WAY ECO-i SYSTEM

Contents

Control Functions

1. CONTROL FUNCTIONS

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

2. Selecting Outdoor Unit for Operation ......................................

3. Compressor Control ....................................................

4. Special Controls .......................................................

5. Other Controls .......................................................

6. Operation of Solenoid Valves ...........................................

Outdoor Unit Electronic Thermostatic Expansion Valves [MOV1, MOV2 & MOV4] ... 1-17

8. Outdoor Fan Control ..................................................

9. Demand Control ......................................................

10. Indoor Unit Control of the Electronic Control Valve .........................

11. Rap Valve Kit Control ..................................................

12. Indoor Unit Refrigerant Oil Self Recovery Control ..........................

13. Discharge Temperature ................................................

14. Current Protection ....................................................

15. Pressure Sensor Failure ...............................................

16. Backup Operation .....................................................

1-14

1-15

1-19

1-20

1-21

1-23

1-24

1-25

1-26

1-27

1-28

1-3

1-4

1-9

17. Service Maintenance Functions .........................................

18. Other Functions ......................................................

1-30

1-32

1 - 1

W-2WAY ECO-i SYSTEM

1. Introduction

The W-2WAY ECO-i is a system that allows multiple outdoor units to be connected. The outdoor units all contain inverter compressors, and the system does not utilize the sub units that were used in earlier systems. The outdoor unit where the unit No. is set to “1” includes the CCU (command controller unit) functions that are used to control the entire system. As a result, the system will not operate if no outdoor unit has been set as unit No. “1.”

Required settings for Test Run

Control Functions

System address No. of indoor units No. of outdoor units Unit No.

Outdoor unit No.1

At time of shipment At time of shipment

1 1

On-site setting On-site setting System 1 ~ 30

1 ~ 40 units

1 ~ 3 units

Unit No. 1

Outdoor unit No. 2

1 1

Not necessary

Not necessary Not necessary

Unit No. 2

This system can be expanded to connect a maximum of 3 outdoor units. (The max. system capacity shall be within 24 Ton.)

The CCU functions are disabled at all units except the unit that is set as unit No. 1. Therefore no problems will result even if the system address, No. of indoor units, and No. of outdoor units settings are made at the other units. However, making these settings may be convenient for manual backup operation, as it eliminates the necessity of making the settings again if unit No. 1 fails.

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W-2WAY ECO-i SYSTEM

2. Selecting an Outdoor Unit for Operation

Control Functions

2-1. Outdoor Unit Operating Rules

Because in this system all outdoor units contain an inverter compressor, ordinarily there is no absolute order of priority for compressor operation. Therefore there is no order of priority for the outdoor units. However, it is possible to operate the outdoor units in sequence, beginning with unit No. 1, by using the outdoor unit maintenance remote controller to change the outdoor unit EEPROM settings.

* For information concerning EEPROM settings, refer to the field application functions.

2-2. Delayed Start of Outdoor Units

(1) Delayed start of outdoor units in the same system

If it is necessary to operate the compressors simultaneously at multiple outdoor units, each outdoor unit will start, beginning with unit No. 1, after a delay of a number of seconds equivalent to the outdoor unit address.

The units do not start simultaneously. This is in order to reduce the load on the power receiving equipment.

Outdoor unit Outdoor unit

address 1 address 2

Starts after 1 second Starts after 2 seconds

(2) Delayed start for each system

At the time of factory shipment, delayed start for each system is not set to occur. Therefore when systems are linked and multiple systems are selected for start simultaneously by the central control device, all systems will begin operating simultaneously. For this reason, a function is included to delay the start time for each system address when systems are linked and multiple systems are selected for start by the central control device. In order to enable this delay time, it must be set in the EEPROM for each system. Those systems where this setting has been made will start after a delay according to their system addresses.

* For information concerning EEPROM settings, refer to the field application functions.

2-3. Outdoor Unit Stop Rules

(1)

Simultaneous stop of multiple outdoor units

When all outdoor units, or multiple outdoor units, must stop, the units stop at the same time. However, depending on the communications timing, a difference of approximately 10 seconds may occur.

(2) Stopping individual outdoor units

The last unit to stop operating is the outdoor unit that contains the inverter compressor with the shortest amount of operating time.

In cooling mode, all inverter compressors in the outdoor units are designed to operate simultaneously Therefore, all the outdoor units will stop at a time when any one unit is stopped. In heating mode, the out door unit which has the inverter compressor with the shortest amount of operating time continues to run and rest of the other outdoor units may be stopped.

1 - 3

3. Compressor Control

3-1. Compressors Mounted in the Outdoor Units

[CHDX07263, CHDX09663]

Capacity

72 96

W-2WAY ECO-i SYSTEM

Control Functions

Installed

compressor

Compressor 1

Compressor 2

INV

Compressor 1

Type 72

Rotary

Scroll

DC Inverter DC Inverter

–––

Constant

speed

Compressor 2

5 hp

hp = horsepower

INV

Compressor 1

Type 96

3-2. Compressor Selection Rules

In cooling mode, all inverter compressors in the outdoor units are designed to operate simultaneously. All the inverter compressors will stop at a time when the outdoor is stopped accordingly. Constant-speed compressors run in order of the shortest amount of operating time. In heating mode, the inverter compressor with the shortest amount of operating time runs at first followed by the compressors in order of the shortest amount of operating time including inverter units.

* Immediately after installation, all compressors have an operating time of zero. In this case, the compressors

start in the following sequence: Inverter compressor > Constant-speed compressor 1 > Constant-speed compressor 2.

Examples of accumulated operating time: ODU=Outdoor Unit Suppose the following tentative system.

Comp 1 Comp 2

ODU 1 100 hrs. 150 hrs.

ODU 2

70 hrs.

160 hrs.

Compressor Selection Sequence in Cooling Mode: All the inverter compressors are firstly selected simultaneously.

Comp 1 Comp 2

ODU 1

1st 3rd

ODU 2

1st 4th

Compressor Selection Sequence in Heating Mode: First, the inverter compressor with the shortest amount of operating time is selected. And then, the remained other compressors are selected and start in the order of shortest amount of operating time

Comp 1 Comp 2

ODU 1

3rd 4th 2nd

ODU 2

1st

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W-2WAY ECO-i SYSTEM

3. Compressor Control

Control Functions

3-3. Compressor Capacity Control

The compressor operating conditions vary depending on the indoor unit operating conditions and the effects of indoor heat load, outdoor temperature and other factors. Unit No. 1 (CCU) calculates the required capacity according to these operating conditions, and allocates the capacity requirement among the outdoor units, according to the compressor start/stop rules. Fine adjustments to system capacity control are made by the inverter compressors. (Depending on the conditions, all inverter compressors may be operating for fine adjustment.)

3-4. Inverter Compressor Capacity Control

(1)

The inverter compressor has a center limit value and upper limit value for the operating frequency. These limits are set for each outdoor unit capacity.

(2) The inverter frequency during operation may be lower than the frequency listed above due to overload current

protection control.

* If Quiet mode is selected, the inverter may stabilize at a frequency lower than those stated above.

For information about Quiet mode, refer to the field application functions.

* If the Power Demand Mode is selected, the inverter may stabilize at a frequency lower than those stated

above. Refer to the Field Application Function for the detail.

3-5. Forced Compressor Stop

Once a compressor stops, it will not start for a period of 3 minutes (3-minute forced OFF). However, this does not apply when the compressor was forced to stop as the result of a control operation during the special controls (start control, defrost control, refrigerant oil recovery control, etc.) which are described later.

3-6. Roadmap Control

(1) The below mentioned Roadmap Control are performed according to the pressure sensor on the outdoor unit

and the 2 temperature sensors attached to the indoor unit heat exchanger coil.

* With the roadmap control in heating mode, the pressure detected by the pressure sensor at high pressure

side is converted to the saturation temperature. This converted saturation temperature is called the “High Pressure Saturated Temperature”.

(2)

This control is performed every 15 seconds.

(3) The evaporation temperature control and the temperature used to determine the area (A, AB, B, C) for the con-

densation control shown in the figure on the next page, may vary depending on the relationships among factors including the difference between the room temperature setting and the air intake temperature (=air intake temperature difference) and the difference between the air discharge temperature setting and the air discharge temperature (=air discharge temperature difference).

(4) Definitions of evaporation temperature and condensation temperature

Evaporation temperature (Te):

Condensation temperature (Tc): Highest temperature among the outdoor unit pressure sensor temperature and

* E3 temperature in heating mode is not used for the condensation temperature detection, because it may indi-

cate the temperature of superheated gas.

Lowest heat exchanger temperature (E1, E3) at any indoor unit

the heat exchanger temperatures (E1) at all indoor units where the heating thermostat is ON. Ordinarily, this is the outdoor unit pressure sensor temperature. (If multiple outdoor units are connected, this is the highest outdoor unit pressure sensor temperature. )

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W-2WAY ECO-i SYSTEM

3. Compressor Control

3-6-1. Evaporation Temperature (Te) Control: Control of Indoor Units Operating in Cooling Mode

60.8

°F

Horsepower increase permitted

51.9

51.8

Horsepower increase permitted

41.1

41.0 Horsepower increase

prohibited

35.6

Horsepower decrease

35.4

Area A

Area AB

Area B

Area C

53.6

51.8

45.5

Maximum requirement level [L]

41.0

35.6

Control Functions

* Depending on the maximum requirement level of the indoor unit, the judgement temperatures for each area may vary as shown in the figure.

(1)

For indoor units that are operating in Cooling Mode, if one unit is selected for a test run mode, the room temperature control by the set temperature cannot be performed. Areas B and C are assumed to be area A for control purposes, instead. By this reason, the compressor continues its operation regardless of the low evaporation temperature (This is used for additional charging of refrigerant, test run checking etc.) Vapor may be discharged if the test run continues for a long time. However, this does not indicate problems.

(2) Even within the same area, the compressor capacity varies depending on the refrigerant temperature.

(3)

For 6 minutes after the compressors start, area C is considered to be area B for control purposes.

(4)

During special control, control of the compressor capacity according to Te is not performed.

(5)

If the thermostat turns OFF while Te is within area C, the next time the compressor starts it may restart from a lower capacity.

(6) When the area changes to area C, area C is considered to be area B for control purposes for the first 6 min-

utes, even if the horsepower is the minimum value within the range where capacity control is possible (operation with inverter frequency of 25 Hz only). Subsequently if C area continues, the thermostat turns OFF.

1 - 6

3. Compressor Control

W-2WAY ECO-i SYSTEM

Control Functions

3-6-2.

Condensation Temperature (Tc) Control: Control of Indoor Units Operating either in Cooling Mode or Heating Mode

PX=125.6

* Depending on the maximum requirement level of the indoor unit, the judgment temperatures for each area may vary as shown in the figure (example).

°F

PX –0.1

118.5

118.4

116.6

116.4

113.0

112.8

Thermostat OFF

Horsepower decrease

Horsepower increase prohibited

Horsepower increase permitted

Area D

Area C

Area B

Area AB

Area A

118.4

116.6

109.4

100.4

98.6

Maximum requirement level [L]

107.6

3015

(1) For indoor units which are operating in Heating mode, if one unit is selected for a test run, the air intake tem-

perature difference is ignored, however Tc control is performed according to the figure above in order to prevent excessive load. (This is used for test run checks, etc.)

(2) Even within the same area, the compressor capacity varies depending on the refrigerant temperature.

(3)

Temperature PX is the coefficient value used to correct for any deviation with the high pressure or condensation temperature. It may vary. (At the time of shipment it is 127°F.)

(4)

If the condensation temperature (Tc) enters area D and the thermostat turns OFF, the next time the compressor starts it may restart from a lower capacity.

3-6-3. Protection control

Protection control consists of 2 types of protection: discharge temperature protection and current protection. The limit values from this protection control are incorporated into the output compressor capacity increase/decrease values that were calculated from control based on the temperature at the indoor unit heat exchanger coil (roadmap control).

In some cases, the control shown below may stop the compressor, issue a warning, or reduce the compressor

capacity.

(1)

Discharge Temperature Protection During operation when only a single outdoor unit is installed, the air discharge temperature level is determined

(the highest value is used), and the compressor capacity is limited, by using the air discharge temperature of the operating compressor (as shown in the tables below).

Air discharge temperature level: Highest level among the air discharge temperature levels of all compressors

Air discharge temp. level

5 4 3 2 1 0

Discharge temp. °F

221 219 217

212 ~ Less than 217 208 ~ Less than 212

Less than 208

Decrease by 2 horsepower Decrease by 1 horsepower Decrease by 0.5 horsepower

Permit horsepower increase (slowly)

No control

Horsepower limit

Prohibit horsepower increase

The values shown in the table above are reduced to the values calculated by roadmap control.

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W-2WAY ECO-i SYSTEM

3. Compressor Control

(2) Current Protection

Inverter compressor current control is composed of primary current control and secondary current control. Current protection control for the inverter compressor is performed by self-protection in the inverter circuit, and does not increase or decrease the compressor capacity.

Control Functions

Primary current

16.0A~

14.5A~

13.5A~

Secondary current

75.0A or (302°F)

16.5A

13.5A

13.0A

80H

90H

12.5A

12.0A

Inverter compressors stop (HIC auto. protection)

Inverter compressors stop (When 100ms is detected, current protection works.)

Hz decrease in the inverter compressor

Prohibit Hz increase in the inverter compressor

Permit Hz increase in the inverter compressor

Control

3-6-4. Roadmap Control after Trip

When restarting after the trip stop occurs, the horsepower may increase slowly depending on the trip counter value. (1) If trip counter =1, the horsepower increases at a speed that is 1/2 of ordinary roadmap control. (2) If trip counter =2, the horsepower increases at a speed that is 1/3 of ordinary roadmap control.

The trip counter will be cleared if no trip occurs within 10 minutes after operation starts.

1 - 8

W-2WAY ECO-i SYSTEM

4. Special Controls

In addition to ordinary heating and cooling operation, this system also includes the following 3 types of special controls for control of the system as a whole.

4-way Valve Adjustment Control

System refrigerant oil recovery control

Defrost control

Control Functions

4-1. 4-way Valve Adjustment Control

When the microcomputer is initialized immediately after power-ON, after warning output, and all outdoor units are kept stopped for a preset period (standard = 60 minutes) , the 4-way Valve Adjustment Control will be performed. This control is intended to changeover the 4-way valve of outdoor unit. When the unit has been stopped for long period, and if refrigerant has accumulated somewhere in the tubing, recovery of the refrigerant is performed. This control can also compensate for tubing thermal loss by radiation during heating start as well as for oil recovery.

(1) Cooling control when the outdoor unit heat exchanger is acting as a condenser

Control time

Outdoor units

Electronic Thermostat

Indoor units

Expansion Valve

RAP valve kit

Fan

When the above operation is finished, normal operation starts at the horsepower determined by the indoor units where thermostats are ON.

60 seconds All outdoor units operate at the maximum horsepower.

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

Valve kits at all indoor units operate in Cooling mode (OFF status).

Fan operates at the set fan speed or stops, depending on the indoor unit operation mode.

(2) Heating control when outdoor unit heat exchanger is acting as an evaporator

Control time Outdoor units

Electronic Thermostat

Expansion Valve Indoor units

When the above operation is finished, normal operation starts at the horsepower determined by the indoor units where thermostats are ON

RAP valve kit

Fan

Minimum 1 min - Maximum 10 min [until max (pressure sensor temp., E1) 95°F ]

All outdoor units operate at the maximum horsepower.

Valves at all indoor units operate at 250 pulses as a default.

Valve kits at all indoor units operate in heating mode (ON status).

Fan operates at the set fan speed, stops or operates at a very low speed, depending on the indoor unit operation mode.

4-2. System Refrigerant Oil Recovery Control

4-2-1. System refrigerant oil recovery cycle

This control is performed using the cooling cycle during cooling operation and using the heating cycle during heat-

ing operation.

4-2-2. Start of System Refrigerant Oil Recovery Control

When the oil level in an operating compressor is detected as 0 (zero), the compressor stops in 120 seconds. If this compressor repeats this operation 3 times and the oil level does not reach 2, system refrigerant oil recovery control is started.

When the compressor has stopped because the oil level is 0, a count is added to the alarm counter. The counter

for this compressor is not cleared unless the oil level for that compressor reaches 2, or else alarm output occurs.

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W-2WAY ECO-i SYSTEM

4. Special Controls

4-2-3. Refrigerant Oil Recovery Control between Systems

(1)

Simplified flow of system refrigerant oil recovery control

Refrigerant oil recovery control between systems shall be performed as the flow mentioned below. Normal operation 3-minute stop Refrigerant oil recovery control between systems (Max. 3 minutes) 3-

minute stop Normal operation

(2)

Cooling cycle

Indoor units

(3)

Heating cycle

Indoor units

Control time Outdoor units

Electronic Thermostat Expansion Valve

RAP valve kit

Fan

Control time

Outdoor units

Electronic Thermostat Expansion Valve

RAP valve kit

Fan

Maximum 3 minutes (Stops once before and once after control.)

All outdoor units operate at maximum horsepower.

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

Valve kits at all indoor units operate in Cooling mode (OFF status.)

Fan operates at the set fan speed, or stops depending on the operation mode of the indoor unit.

Maximum 3 minutes (Stops once before and once after control.) All outdoor units operate at maximum horsepower.

Valves at all indoor units operate at 480 pulse.

Valve kits at all indoor units operate in Heating mode (ON status.)

Fan operates at the set fan speed, stops or operates at a very low speed.

Control Functions

4-3. Defrost Control

4-3-1. Defrost Methods

This system uses the following 2 defrosting systems.

System employs Defrost control method

1 outdoor unit in the refrigerant system

2 outdoor units in the refrigerant system

4-3-2. Constraint conditions

(1)

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

(2)

Defrost does not begin again for 35 minutes of A/C operation after defrost was once completed.

(3)

If all indoor units are stopped while defrost control is in effect, or if the outdoor unit is stopped due to protection control or another reason, then defrost control will not start for a minimum of 10 minutes after restart occurs.

Reverse cycle defrost

Outdoor unit cycle defrost

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W-2WAY ECO-i SYSTEM

4. Special Controls

4-3-3. Frost detection

(A) Frost detection does not occur for 5 minutes after operation starts. (B) Frost is detected when either condition 1 or 2 below is met.

Condition 1: L2 line or below is detected twice, each time continuously for 4 minutes, when the compressor is operating.

Condition 2: L1 line or below is detected for a total of 60 minutes when the compressor is operating.

Control Functions

Heat exchange liquid temperature °F

–6.5

Defrosting operation end temperatur

–9

–13

The frost detection area is located under the thick lines

(The end temperature is different from the above detection temperature.)

External temperature °F

4-3-4. Outdoor units where defrost occurs

Even if the total time has not reached 35 minutes, if there is 1 or more outdoor units that fulfills the defrost detection conditions, all operating outdoor units perform defrost control at the same time.

* 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).

4-3-5. Reverse Cycle Defrost

If there is 1 outdoor unit and no thermal storage tank in a refrigerant system, a reverse cycle defrost will be carried out.

• Defrost flow E: Evaporator operation C: Condenser operation E C: Switching from evaporator operation to condenser operation C E: Switching from condenser operation to evaporator operation

Outdoor unit status

Stopped indoor units

Indoor units where fan is operating

Cooling mode indoor units

Heating mode indoor units

Thermostat ON Thermostat OFF Thermostat ON Thermostat OFF

Compressor

Time

Defrost preparation

E C

C E C E

C E C E C E C E

Stopped Stopped

1 min

E C

E E E E E E

Operating

1 min

Defrost in progress

C E E E E E E

Operating

1 - 11

Defrost end judgment

Max. 10 min

Defrost end

C E E C E C

E C

E C E C E C

1 min

W-2WAY ECO-i SYSTEM

4. Special Controls

4-3-6. Outdoor unit cycle defrost

Outdoor unit cycle defrost is performed in systems where 2 outdoor units are connected to the refrigerant system.

(1)

Description of outdoor unit cycle defrost With this defrost method, when 1 outdoor unit operates in defrost mode (heat exchanger operating as a con-

denser), another outdoor unit operates as an evaporator in the same way as in ordinary heating mode. In this way, the other outdoor unit is heating the unit where defrost is occurring. When 1 outdoor unit completes defrost, the other outdoor unit performs defrost in the same way. Because the amount of time that the unit operates as an evaporator is very short, there is little danger of frost forming again quickly. Rather, because the heat source is very powerful, it is possible to shorten the defrost operating time.

Defrost sequence

(2)

Outdoor unit cycle defrost is always completed in 2 defrost operations.

(A) When there are 2 outdoor units

Switch

Defrost

outdoor unit outdoor unit

Evaporator

outdoor unit outdoor unit

Defrost

Control Functions

First operation Second operation

• Defrost flow E: Evaporator operation C: Condenser operation S: Shut off E C: Switching from evaporator operation to condenser operation C E: Switching from condenser operation to evaporator operation

Outdoor unit(s) where defrost occurs first

Outdoor compressor(s) where defrost occurs first

Outdoor unit(s) where defrost follows later

Outdoor compressor(s) where defrost follows later

Stopped indoor unit(s)

Indoor units where fan is operating

Heating mode indoor units

Thermostat ON Thermostat OFF

Time

Defrost

preparation

E C

OFF

S S C C

1 min

Defrost in progress

Defrost

ON ON

end

judgment

S C C

Switch

C E

OFF

E C

OFF

S C C

1 min

SS S C C

Defrost in progress

Defrost end judgment

Defrost

preparation

E or S

OFF

C E or S

OFF

S C C

1 minMax. 6 minMax. 6 min

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W-2WAY ECO-i SYSTEM

4. Special Controls

4-3-7. Defrost end judgment conditions

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

Condition 1: The temperatures are 50°F or higher at all temperatures sensors installed on the outdoor unit heat

exchanger coils. However, if there is any other outdoor unit where the defrost end condition has not been met, defrost control continues for all outdoor units, and system defrost control is not ended.

Condition 2: The maximum defrost time listed in the table above has elapsed.

4-3-8. System defrost end

When all outdoor units where defrost control is in effect have met the defrost end conditions, defrost control is ended for the system.

Control Functions

1 - 13

5. Other Controls

5-1. Oil Control

5-1-1. Oil level

W-2WAY ECO-i SYSTEM

Control Functions

Oil level

Meaning Conditions of oil Judgement

Sufficient

Slightly low

Extremely low

The compressor contains oil more than the oil level which is necessary and sufficient for normal operation.

The compressor contains sufficient oil but there is a possibility of shortage against the required oil level.

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

There is no problem.

Confirm that oil is returned after performing the oil control operation.

Confirm that oil level is recovered to the required level after performing the oil recovery control between 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 to 1, the oil in the compressor is not empty. If the oil level “0” indication continues for more than 5 to 10 minutes, it seems short of oil in the system. Check for any oil leakage as well as the refrigerant tubing.

5-1-2. Oil level detection

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

5-1-3. Self-separator oil recovery control

* When a low oil level is detected, this control recovers the oil which has accumulated in that oil separator and sends it to the compressor.

Operation when oil level is not 2.

(1)

30 seconds after the oil level changes from 2 to 1, the recovery valves turn ON. However, if the oil level becomes 2, this control is stopped.

5-1-4. Unit refrigerant oil recovery control – utilizing balance tubes

* If the low oil level continues, that outdoor unit (oil-receiving outdoor unit) receives a supply of oil from operating

outdoor units where the oil level is not low (oil-supply outdoor units).

(1) Control at the oil-supply outdoor unit begins 3 minutes after the oil level at the outdoor unit dose not become 2.

Oil supply is performed for a maximum of 5 minutes from each unit.

(2) When oil supply is ended, oil supply from that outdoor unit will not occur again for a period of [(No. of outdoor

units minus1) x 5 minutes]. In addition, oil supply is ended if the oil-receiving outdoor unit oil level changes to 2, or if the oil-supply outdoor unit oil level becomes low.

(3) The supply of oil is received from 1 unit at a time, in sequence, according to the order of priority of their inverter

compressors.

(4) Operation during unit refrigerant oil recovery

(A) Oil-receiving outdoor unit

The recovery valve turns ON and remains ON.

(B) Oil-supply outdoor unit

The balance valve turns ON and remains ON. The bypass valve repeatedly turns ON and OFF according to a constant cycle.

5-1-5. Indoor unit refrigerant oil self-recovery control

Refer to the items concerned with indoor unit special control.

1 - 14

W-2WAY ECO-i SYSTEM

6. Operation of Solenoid Valves

Control Functions

6-1. Refrigerant Control Valve [RCV]

The main purpose of this valve is to detect the flow of refrigerant (refrigerant volume) on the indoor-unit side when the outdoor unit heat exchanger is functioning as a condenser. When the valve determines that there are signs of a low refrigerant level, refrigerant is supplied from the receiver tank to the system.

The OFF conditions take priority over the ON conditions for this valve.

(1)

This valve is OFF when the outdoor unit is stopped.

(2)

This valve is ON when special control is in progress.

(3)

(4) Control during normal operation

(A) Cooling operation

This valve turns ON when symptoms of insufficient refrigerant gas occur at an indoor unit.

This valve turns ON when the outdoor air temperature is 59°F or below. (Under these conditions the high pressure is low and refrigerant flow becomes poor.)

This valve turns OFF when symptoms of refrigerant overcharge are detected at the outdoor unit.

(B) Mixed cooling/heating operation

The RCV turns ON at stopped outdoor units when the heat exchanger at another outdoor unit is functioning as a condenser.

6-2. Refrigerant Balance Valve [RBV] – Gas Purge Valve

The main purpose of this valve is to detect the flow of refrigerant (refrigerant volume) on the indoor-unit side when the outdoor unit heat exchanger is functioning as an evaporator. When the valve determines that there are signs of excess refrigerant, refrigerant is recovered at the receiver tank.

This valve is ON during heating operation and when the outdoor unit heat exchanger is functioning as an evaporator during mixed heating/cooling operation. It also turns ON in order to recover refrigerant at the outdoor unit after heating operation is stopped.

* This valve is never turned ON at the same time with the RCV.

(1)

The OFF conditions take priority over the ON conditions for this valve.

(2)

This valve turns ON for 30 – 50 seconds after the outdoor unit stops, and then turns OFF.

(3)

This valve turns ON once after the outdoor unit starts.

(A) Heating operation

This valve is ON during heating operation and when it turns ON for the purpose of recovering refrigerant in the outdoor unit at the end of the heating operation. After the valve turns from ON to OFF, it will not turn ON again for 15 minutes.

This valve turns ON when poor refrigerant flow at an indoor unit is detected, and when symptoms of overcharge are detected, if the heat exchanger at the outdoor unit is functioning as an evaporator.

(4) This valve turns OFF when an abnormal drop in discharge gas temperature is detected.

(5) This valve turns OFF when a drop in the detected receiver tank temperature contin-

ues for a set length of time, and when liquid back-flow is judged to be occurring.

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W-2WAY ECO-i SYSTEM

6. Operation of Solenoid Valves

Control Functions

6-3. Recovery Valve (ORVR)

This valve recovers refrigerant oil from the balance tube to the compressor.

(1) When unit is stopped

This valve is always OFF.

(2) When unit is operating

This valve turns ON when separator oil self-recovery control is in progress.

(A)

This valve is ON when unit refrigerant oil recovery control is in progress (oil-receiving unit).

(B)

This valve is ON when control the system in case of insufficient refrigerant gas.

(C)

This valve turns ON for 60 seconds after a constant-speed compressor starts.

(D)

This valve turns ON for 120 seconds after defrost control ends.

(E)

This valve turns ON for 10 seconds after the outdoor unit stops.

(F)

This valve remains OFF at all times other than (A) through (F) above.

(G)

6-4. Bypass Valve (BPV)

This valve flushes the oil from the balance tubes. In addition, it is used for recovering refrigerant from stopped outdoor units during cooling operation.

(1) When unit is stopped

This valve is always OFF.

(2) When unit is operating

This valve is ON at the oil-supply outdoor unit when unit refrigerant oil recovery control is in progress.

* This valve repeatedly turns ON/OFF at regular intervals during unit refrigerant oil recovery control. (It is not constantly ON.)

1 - 16

7. Outdoor Unit Electronic Thermostatic Expansion Valves [MOV1, MOV2 & MOV4]

W-2WAY ECO-i SYSTEM

Control Functions

7-1. Types of Electronic Thermostatic Expansion Valves

[CHDX07263, CHDX09663]

Electronic control valve

Capacity

Electronic control valve 1

Electronic control valve 2

Electronic control valve 4

72 96

Heat exchanger 1 valve

Heat exchanger 2 valve

For SC circuit

Heat exchanger 1 valve

Heat exchanger 2 valve

For SC circuit

7-2. Power Initialization

If no indoor units have started (even once) after the power was turned ON, the outdoor unit electronic control valve operates at 480 pulses.

7-3. Heat Exchangers which are controlled by each Electronic Thermostatic Expansion Valve

The configuration of heat exchangers is as shown in the figure below. MOV3 is excluded.

Heat

Heat exchanger 2

Front

exchanger 1

Operation of Electronic Thermostatic Expansion Valve during normal unit operation

If any one compressor in the outdoor unit is operating, the outdoor heat exchanger coil is used. In cooling operation, all the inverter compressors are designed to operate, therefore, all the outdoor heat exchangers in the outdoor units will be used.

SH control controls the difference between the liquid temperature and gas temperature to 2°F ~ 10°F.

During heating mode SH operation in the heat exchanger 2 side, in order to prevent a liquid-back or high load operation from occurring a control may be implemented so that refrigerant may not flow intentionally to the heat exchanger.

1 - 17

7. Outdoor Unit Electronic Thermostatic Expansion Valves [MOV1, MOV2 & MOV4]

W-2WAY ECO-i SYSTEM

Control Functions

7-4. SC Circuit Electronic Control Valve [MOV4]

(1) SC Control (Cooling Mode only

During cooling operation, the liquid refrigerant which condenses at the outdoor unit heat exchanger flows into the receiver tank, and SC (sub-cool = supercooling) approaches 0°F. When SC is small and the length of the tubing connecting the indoor and outdoor units is long, the refrigerant flow in the indoor unit will be reduced significantly. To prevent this trouble from occurring, MOV4 operates so as to increase supercooling in the double tube coil near the outlet of the outdoor unit. MOV4 controls refrigerant so that it will not flow back to the compressor in the liquid state with a suction temperature sensor near the accumulator and a low pressure sensor.

Gas refrigerant returns to the accumulator.

)

Liquid refrigerant (SC = 0°F)

Refrigerant on the outer side evaporates, cooling the liquid refrigerant on the inner side.

Liquid refrigerant (large SC)

Electronic control valve 4 (expansion valve) controls the flow.

(2) Operation when discharge temperature is high

When the discharge temperature increases, the SC circuit electronic thermostatic expansion valve opens to 480 pulses to cool down the compressor. This operation takes priority over operation intended to increase SC. It is performed at top priority in all operating modes. In addition, the valve opening adjustment will be made when the discharge temperature falls.

Liquid refrigerant returns to the accumulator.

Does not fully evaporate, resulting in liquid back-up.

Liquid refrigerant

Electronic control valve 4 opens to 480 pulses.

1 - 18

W-2WAY ECO-i SYSTEM

8. Outdoor Fan Control

Control Functions

8-1. Fan mode

These outdoor units utilize a DC fan motor that can be controlled in a maximum of 16 steps (16 modes). However, fan modes 15 and 16 can only be used if high static-pressure mode has been set. * For information concerning EEPROM settings, refer to the field application functions.

8-2. Outdoor Fan Min. Fan Mode and Max. Fan Mode

Min. fan mode

Cooling operation

Heating operation

Even if the fan mode is 0 during cooling operation, the fan mode may change to 1 at regular intervals for temperature protection of the inverter hybrid IC.

Outdoor air temp. > 59 Outdoor air temp.

59°F: 0

°F

: 1

Max. fan mode

8-3. Fixed Initial Fan Mode

For the first 30 seconds after operation starts, the mode 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 changes dramatically, say for about 2 hp, the initial mode may be recalculated and may be again fixed for 30 seconds.

8-4. Operation after Fixed Initial Fan Mode

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

(1) When all indoor units are operating in cooling mode

(A) Fan mode is increased when the high pressure satulation temperature sensed by the pressure sensor is

high, and is decreased when the pressure sensor temperature is low.

* The fan mode is always increased when the high pressure satulation temperature sensed by the pressure sensor is 113°F or higher.

The fan mode may be decreased when symptoms of insufficient refrigerant gas are detected at an indoor unit.

(B)

(2) When all indoor units are operating in heating mode

If the condensation temperature is low, the fan mode is increased at regular intervals.

(A)

If the condensation temperature is high, the fan mode is decreased in order to prevent excessive loads.

(B)

The fan mode may be increased when the outdoor liquid temperature drops to 44°F or below.

(C)

8-5. Snow Removal Control

(1)

When the outdoor air temperature is 50°F or below, the fan operates for 30 seconds every 2 hours in fan mode 8, even when the outdoor unit is stopped or the heat exchanger is not in use. This control is intended to prevent snow from accumulating on stopped fans. (Because the outdoor air temperature cannot be accurately detected when the unit is stopped, a higher outdoor air temperature is used for the control condition, in order to ensure correct operation.)

(2)

If the fan mode becomes 0 during cooling operation, the fan mode is changed to 1. *

This control is predictive control. Use a snowfall sensor as necessary according to the installation conditions.

8-6. When the Compressor Magnet Switch Seizing Alarm Occurs

Because there is the possibility that the high pressure has increased, the fan operates in Max. fan mode.

8-7. Other

This unit includes settings for high static-pressure and for Quiet mode. For information about these settings, refer to the field application functions.

1 - 19

W-2WAY ECO-i SYSTEM

9. Demand Control

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

The demand values can be set as needed with this device. For more information, refer to the field application functions.

Control Functions

Demand setting

Contact 1

Input present

Contact 2

Control

No control

Operates to the upper limit for the rated current. Operates to 70% of the upper limit for the rated current. Always in stop condition.

Input not present

Demand meaning

Operates to maximum capacity.

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

1 - 20

W-2WAY ECO-i SYSTEM

10. Indoor Unit Control of the Electronic Control Valve

Control Functions

10-1. Normal Control

(1) Cooling operation

Position of electronic control valve

Outdoor unit operating

Cooling

Stopped

Fan

Thermostat

OFF

Performs SH control in the range of 55 – 480 pulses.

20 20 20 20

20 20

* The SH target value is controlled so that the E3 - E1 becomes between 2°F to 6°F, depending on the operating conditions.

However, a decline in the required level may cause the SH target value to increase. Be aware that in this case, the electronic control valve closes slightly. This can be easily identified incorrectly as insufficient gas.

(2) Heating operation

(A) Except Type D

Position of electronic control valve

Outdoor unit operating

Liquid refrigerant is gradually returned to the outdoor unit at pulses ranging from 55 to 80.

Performs SC distribution control within the range of 55– 480 pulses.

Heating

Stopped

Fan

Thermostat

OFF

Thermostat

Outdoor unit

stopped

–

Outdoor unit

stopped

–

* The SC target value is controlled so that the high pressure saturated temp. - E1 becomes between 10°F to 40°F , depending on the operating conditions.

(B) Type D

Position of electronic control valve

Outdoor unit

stopped

–

Heating

Outdoor unit operating

Stopped

Fan

Thermostat

OFF

ThermostatONPerforms SC distribution control within the range of 55 –

480 pulses.

20 20 20 20

20 20

* The SC target value is controlled so that the high pressure saturated temp. - E1 becomes between 10°F to 40°F, depending on the operating conditions.

However, if installation is combined with except Type D, the high pressure saturated temp. - E1 may be controlled between 10°F to 80°F.

1 - 21

10. Indoor Unit Control of the Electronic Control Valve

10-2. Special Control

W-2WAY ECO-i SYSTEM

Control Functions

Control

4-way valve

adjustment control

Reverse cycle

defrost control

Outdoor cycle

defrost control

System refrigerant

oil recovery control

Operating

mode

Cooling

Heating

Cooling/

heating

Cooling

Heating

Subject indoor units Position of electronic control valve

All indoor units

Stopped

Fan

Thermostat

Heating

OFF

Stopped

Fan

Thermostat

OFF

All indoor units

Fixed pulse for cooling, according to indoor unit capacity

250 Cooling control, according to indoor unit capacity Cooling control, according to indoor unit capacity Fixed pulse for heating, according to indoor unit capacity

Heating control, according to indoor unit capacity However, position is 20 pulses for Type D.

60 pulses 60 pulses

60 pulses

Fixed pulse for cooling, according to indoor unit capacity

250

1 - 22

W-2WAY ECO-i SYSTEM

11. Rap Valve Kit Control

A gas tube valve kit may be connected to the Type D indoor unit. When the gas tube valve kit is connected, operations of gas tube valve kit and indoor unit electronic thermostatic expansion valve are as shown in the table.

Control Functions

Stopped

Thermostat

CoolingHeating

Thermostat

Fan

OFF

Gas tube valve

OFF OFF

OFF

Electronic thermostatic expansion valve

20 pulses 20 pulses

20 pulses

Superheat control (65 – 480)

20 pulses

Superheat control (50 – 480)

1 - 23

W-2WAY ECO-i SYSTEM

12. Indoor Unit Refrigerant Oil Self Recovery Control

This control is carried out regularly in cooling mode only.

(1)

During stopped, fan or thermostat OFF condition, indoor unit expansion valve is opened regularly for 1 to 2 minutes regularly (at an interval of once every 2 hours.)

(2)

During the thermostat ON, the indoor unit electronic thermostatic expansion valve is opened about 10 pulses from the current status.

Control Functions

1 - 24

W-2WAY ECO-i SYSTEM

13. Discharge Temperature

Control Functions

(1) Discharge temperature protection alarm

This device sets an upper limit discharge temperature of 222°F for all compressors. When the discharge temperature reaches 222°F, that compressor is stopped and restarted. If the same high discharge condition occurs 4 times, then an alarm occurs.

After a compressor has stopped, that compressor will not operate until the temperature has dropped to or below the start-prohibit temperature.

Discharge temperature protection list

Compressor No. Compressor 1 Compressor 2

Type Inverter Constant-speed

Stop temp.

Start-prohibit temp.

Alarm display

(2) Discharge sensor trouble detection control

An alarm occurs if the discharge temperature remains abnormally high (above 158°F), when the system has been stopped for 60 minutes.

* In this case, possible causes include sensor failure and compressor overheating caused by an insufficient level of refrigerant. The alarm also occurs if the sensor temperature is at or above the abnormal temperature (176°F) when 20 min utes have passed after the compressor stopped.

* In this case, it is possible that the discharge temperature from a different outdoor unit is being detected, due to an error in the installation of the discharge thermistor.

222°F 222°F

158°F 158°F

P03 P17

Discharge sensor failure list

Compressor No. Compressor 1 Compressor 2

Type

Alarm display

Inverter Constant-speed

F04 F05

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