Sanyo ECO-i CHDZR07263 Series User manual

Outdoor Units
Refrigerant R410A is used in the outdoor units.
9672Class
C ECO-i W-3WAY CHDZ07263
CHDZ09663
CHDZR07263 CHDZR09663
85464849281000 REFERENCE NO. SM830181-00
Indoor Units
Class 9 12 15 18 2419 36 5448
UM Slim Concealed
Duct Type UMHX0762 UMHX1262UMHX0962 UMHX1562 UMHX1862
XM 4-Way Air Discharge
Mini Semi-Concealed XMHX1252 XMHX1852
U Concealed Duct Type UHX0762 UHX1262UHX0962 UHX1562 UHX1862 UHX2462 UHX3662 UHX4862 UHX5462
X4-Way Air Discharge
Semi-Concealed XHX1252 XHX1852 XHX2452 XHX3652
A1-Way Air Discharge
Semi-Concealed AHX0752 AHX1252AHX0952
T Ceiling-Mounted THX1252 THX1852 THX2452
DConcealed-Duct High
Static Pressure DHX3652 DHX4852
FHX0762 FHX1262FHX0962 FHX1562 FHX1862 FHX2462F
FMHX0762 FMHX1262
FMHX0962 FMHX1562 FMHX1862 FMHX2462
FM Concealed-Floor
Standing Type
KHX0752 KHX1252KHX0952K KHX1862 KHX1962**
**
KHX2452
7
3-WAY ECO-i
MULTI SYSTEM
CHDZ07263
CHDZ09663
CHDZR07263
CHDZR09663
*
*
* Salt-Air Damage Resistant Specifications.
** Necessary to install the External Electronic Expansion Valve Kit (Optional:ATK-SVRK56BA).
SERVICE MANUAL
Wall-Mounted Type
Floor-Standing Type
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Please Read Before Starting
This air conditioning system meets strict safety and operat-
ing 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.
E
• 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 sys-
tem. Carefully refer to the wiring diagram and these
instructions when wiring. Improper connections and inad-
equate 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.
t
…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 con-
nection.
• 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 leak-
ing. 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 fail-
ure 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 over-
heating 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.
•
•
•
•
•
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Check of Density Limit
The room in which the air conditioner is to be
installed requires a design that in the event of refrig-
erant gas leaking out, its density will not exceed a set
limit.
The refrigerant (R410A), which is used in the aircondition-
er, 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. Suf-
focation 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 effec-
tive use off loor space, individual control, energy conserva-
tion 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 pro-
cedure 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 safe-
guards 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
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— 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
5. Other Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
6. Operation of Solenoid Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
7. Outdoor Unit Electronic Control Valves [MOV1, MOV2, MOV4] . . . . . . . . . . . . . . . . . . . . 1-19
8. Outdoor Fan Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
9. Demand Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
10. Indoor Unit Control of the Electronic Control Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
11. Solenoid Valve Kit Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
12. Indoor Special Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
13. Discharge Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27
14. Current Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28
15. Low Oil Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-29
16. Pressure Sensor Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30
17. Backup Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31
18. Service Maintenance Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33
19. Other Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-36
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
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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
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. 3-WAY 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
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3-WAY ECO-i SYSTEM
Control Functions
Contents
1. CONTROL FUNCTIONS
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
2. Selecting Outdoor Unit for Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
3. Compressor Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
4. Special Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
5. Other Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
6. Operation of Solenoid Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
7. Outdoor Unit Electronic Control Valves [MOV1, MOV2, MOV4] . . . . . . . . . . . . . . . . 1-19
8. Outdoor Fan Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
9. Demand Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
10. Indoor Unit Control of the Electronic Control Valve . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
11. Solenoid Valve Kit Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
12. Indoor Special Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
13. Discharge Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27
14. Current Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28
15. Low Oil Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-29
16. Pressure Sensor Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30
17. Backup Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31
18. Service Maintenance Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33
19. Other Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-36
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1. Introduction
3-WAY ECO-i SYSTEM
Control Functions
The 3-WAY 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
Outdoor unit No. 1 Outdoor unit Nos. 2
At time of shipment On-site setting At time of shipment On-site setting
System address 1 System 1 ~ 30 1 Not necessary
No. of indoor units 1 1 ~ 40 units 1 Not necessary
No. of outdoor units 1 1 ~ 3 units 1 Not necessary
Unit No. 1 Unit No. 1 1 Unit Nos. 2
This system can be expanded to connect a maximum of 3 outdoor units. (The system maximum capacity is 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. (If unit No. 1 fails, and the power supply to it is interrupted, it will be nec-
essary to set a different unit as unit No. 1 in order to use manual backup operation.)
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3-WAY ECO-i SYSTEM
Control Functions
2. Selecting an Outdoor Unit for Operation
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
address 1
Outdoor unit
address 2
(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.
●If the indoor load decreases, and it becomes necessary to reduce the number of operating outdoor units, the
compressors are stopped individually, in sequence. When all compressors installed in an outdoor unit have
stopped, that outdoor unit also stops.
Starts after 1 second Starts after 2 seconds
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3. Compressor Control
3-WAY ECO-i SYSTEM
Control Functions
3-1. Compressors Mounted in the Outdoor Units
[CHDZ07263, CHDZR07263, CHDZ09663, CHDZR09663]
Capacity 72 96
Installed
compressor
Compressor 1 Rotary DC Inverter DC Inverter
Compressor 2 Scroll
– 5 hp
Constant
speed INVINV
Compressor 2 Compressor 1Compressor 1
Type 96Type 72
3-2. Compressor Selection Rules
Because all outdoor units in this system contain an inverter compressor, ordinarily there is no absolute order of
priority for compressor operation.
(1) Normal compressor operation sequence (set at time of shipment)
At least one inverter compressor is always operating in order to make fine adjustments to the system
lower-limit capacity. When multiple outdoor units are connected, each unit contains an inverter compressor.
Therefore, the inverter which operates is the inverter with the shortest amount of operating time. After the first
inverter compressor has started, the remaining inverter compressors and constant-speed compressors start
operating in order of the compressors which have the shortest amount of operating time.
* 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.
<Details>
The A/C units are selected with consideration for the maximum load. Therefore, in most cases the maximum
capacity is not required. Ordinarily, the operating range of an inverter compressor is approximately 25 Hz – 90
Hz, however operating efficiency declines somewhat in the high-frequency operating range. With consideration
for these characteristics, control of inverter compressors in this system is divided into two ranges, according
to the frequencies. Ordinarily, for reasons of efficiency, the upper limit for operation is approximately 50 Hz. If
greater capacity is required, the next compressor is started. When all compressors are operating and greater
capacity is required, the inverter compressors are operated at frequencies above approximately 50 Hz. This
control may increase the lifetimes of the inverter compressors and refrigerant oil.
* If the number of connected outdoor units is small, the number of inverter compressors is also small. Therefore,
the compressors may operate at a high frequency even when the load is not large.
(2) Sequential operation beginning from unit No. 1
By using the outdoor unit maintenance remote controller to change the outdoor unit EEPROM settings, it is
possible to start the units in sequence, beginning from unit No. 1.
* For information concerning EEPROM settings, refer to the field application functions.
hp = horsepower
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3-WAY ECO-i SYSTEM
Control Functions
3. Compressor Control
3-3. Compressor Capacity Control
The compressor operating conditions vary depending on the indoor unit operating conditions and on the effects
of indoor heat load, outside 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. In this case, the inverter frequency lower limit is 22 Hz.
* 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.
3-5. Forced Compressor Stop
After a compressor stops, it will not start for a period of 3 minutes (3 minutes 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 controls are performed according to the pressure sensor on the outdoor unit, and the 2 temperature
sensors attached to the indoor unit heat exchanger.
* With roadmap control, the pressure detected by the pressure sensor is converted to saturation temperature.
A temperature that has been converted to saturation temperature is called the pressure sensor temperature.
(2) These controls are performed every 30 seconds.
(3) The temperatures used to determine the area (A, AB, B, C) for the evaporation temperature control shown in
the figure on the next page, and for condensation temperature control, may vary depending on the relationships
among factors including the difference between the room temperature setting and the indoor unit 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): Lowest heat exchanger temperature (E1, E3) at any indoor unit
Condensation temperature (Tc): Highest temperature among the outdoor unit pressure sensor temperature and
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.)
* E3 temperature is not used for condensation temperature detection, because it may indicate the temperature
of superheated gas.
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