Sanyo SPW-C0705DXHN8 User manual

SERVICE MANUAL
85464849263000
2-WAY ECO-i
MULTI SYSTEM
REFERENCE NO.SM830163-00
Outdoor Unit
Class 70 90 115 130 140
C Model Name
SPW-C0705DXHN8 SPW-C0905DXHN8 SPW-C1155DXHN8 SPW-C1305DXHN8 SPW-C1405DXHN8
SPW-C0705DXHN8R SPW-C0905DXHN8R SPW-C1155DXHN8R SPW-C1305DXHN8R SPW-C1405DXHN8R
Indoor Unit
Class 7 9 12 16 18 25 30 36 48 60
X
4-Way Air Discharge
Semi-Concealed
SPW-
XDR74GXH56(A/B)
X075XH
SPW-
XDR94GXH56(A/B)
X095XH
SPW-
XDR124GXH56(A/B)
X125XH
SPW-
XDR164GXH56(A/B)
X165XH
SPW-
XDR184GXH56(A/B)
X185XH
SPW-
XDR254GXH56(A/B)
X255XH
SPW-
XDR364GXH56(A/B)
X365XH
SPW-
XDR484GXH56(A/B)
X485XH
SPW-
XDR604GXH56(A/B)
X605XH
XM
4-Way Air Discharge
Semi-Concealed
SPW-
XM075XH
SPW-
XM095XH
SPW-
XM125XH
SPW-
XM165XH
SPW-
XM185XH
S
2-Way Air Discharge
Semi-Concealed
SPW-
SR74GXH56(A/B)
SPW-
SR94GXH56(A/B)
SPW-
SR124GXH56(A/B)
SPW-
SR164GXH56(A/B)
SPW-
SR184GXH56(A/B)
SPW-
SR254GXH56(A/B)
A
1-Way Air Discharge
Semi-Concealed
SPW-
ADR74GXH56B
SPW-
ADR94GXH56B
SPW-
ADR124GXH56B
L
1-Way Air Discharge
Semi-Concealed Slim
SPW-
LDR94GXH56(A/B)
SPW-
LDR124GXH56(A/B)
SPW-
LDR164GXH56(A/B)
SPW-
LDR184GXH56(A/B)
SPW-
LDR254GXH56(A/B)
U
Concealed-Duct
SPW-
UR74GXH56(A/B)
U075XH
UR74SXH56B
SPW-
UR94GXH56(A/B)
U095XH
UR94SXH56B
SPW-
UR124GXH56(A/B)
U125XH
UR124SXH56B
SPW-
UR164GXH56(A/B)
U165XH
UR164SXH56B
SPW-
UR184GXH56(A/B)
U185XH
UR184SXH56B
SPW-
UR254GXH56(A/B)
U255XH
UR254SXH56B
SPW-
UR304SXH56B
SPW-
UR364GXH56(A/B)
U365XH
UR364SXH56B
SPW-
UR484GXH56(A/B)
U485XH
UR484SXH56B
SPW-
UR604GXH56(A/B)
U605XH
UR604SXH56B
US
Concealed-Duct
SPW-
US075XH
SPW-
US095XH
SPW-
US125XH
SPW-
US165XH
SPW-
US185XH
T
Ceiling-Mounted
SPW-
TDR124GXH56(A/B)
T125XH
SPW-
TDR164GXH56(A/B)
T165XH
SPW-
TDR184GXH56(A/B)
T185XH
SPW-
TDR254GXH56(A/B)
T255XH
SPW-
TDR364GXH56(A/B)
T365XH
SPW-
TDR484GXH56(A/B)
T485XH
K
Wall-Mounted
SPW-
KR74GXH56(A/B)
K075XH
SPW-
KR94GXH56(A/B)
K095XH
SPW-
KR124GXH56(A/B)
K125XH
SPW-
KR164GXH56(A/B)
SPW-
KR184GXH56(A/B)
SPW-
KR254GXH56(A/B)
FM
Concealed Floor Standing
SPW-
FMR74GXH56(A/B)
SPW-
FMR94GXH56(A/B)
SPW-
FMR124GXH56(A/B)
SPW-
FMR164GXH56(A/B)
SPW-
FMR184GXH56(A/B)
SPW-
FMR254GXH56(A/B)
F
Floor Standing
SPW-
FR74GXH56(A/B)
SPW-
FR94GXH56(A/B)
SPW-
FR124GXH56(A/B)
SPW-
FR164GXH56(A/B)
SPW-
FR184GXH56(A/B)
SPW-
FR254GXH56(A/B)
GU
Total Heat Exchanger
with DX coil
SPW-
GU055XH
SPW-
GU075XH
SPW-
GU105XH
Class 25 36 48 76 96
D
Concealed-Duct
High-Static Pressure
SPW-
DR254GXH56(A/B)
SPW-
DR364GXH56(A/B)
SPW-
DR484GXH56(A/B)
SPW-
DR764GXH56(A/B)
SPW-
DR964GXH56(A/B)
W-2WAYECO-iSYSTEMCover.inddaW-2WAYECO-iSYSTEMCover.indda 2008/09/0416:07:462008/09/0416:07:46

i
W-2WAYECO-iSYSTEMCover.inddbW-2WAYECO-iSYSTEMCover.inddb 2008/09/0416:07:472008/09/0416:07:47

ii
W-2WAYECO-iSYSTEMCover.inddcW-2WAYECO-iSYSTEMCover.inddc 2008/09/0416:07:472008/09/0416:07:47

iii
— 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-38
12. Replacing 4-way Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-39
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
W-2WAYECO-iSYSTEMCover.indddW-2WAYECO-iSYSTEMCover.inddd 2008/09/0810:15:362008/09/0810:15:36

iv
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
W-2WAYECO-iSYSTEMCover.inddeW-2WAYECO-iSYSTEMCover.indde 2008/09/0418:26:172008/09/0418:26:17

1- 1
1
W-2WAY ECO-i SYSTEM
Control Functions
1. CONTROL FUNCTIONS
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
sec1-document.qxd:05-179 (1/2).qxd 08.8.22 1:51 PM Page 1

1
1- 2
W-2WAY ECO-i SYSTEM
Control Functions
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
This system can be expanded to connect a maximum of 3 outdoor units. (The max. system capacity shall be within
48PS.)
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.
Outdoor unit No. 1 Outdoor unit Nos. 2 ~ 3
1
1
1
1
1
1
1
1
At time of shipment At time of shipment
System address
No. of indoor units
No. of outdoor units
Unit No.
On-site setting On-site setting
System 1 ~ 30
1 ~ 40 units
1 ~ 3 units
Unit No. 1
Not necessary
Not necessary
Not necessary
Unit Nos. 2 ~ 3
1. Introduction
sec1-document.qxd:05-179 (1/2).qxd 08.8.22 1:51 PM Page 2

1- 3
1
W-2WAY ECO-i SYSTEM
Control Functions
(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 set-
ting 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, depend-
ing on the communications timing, a difference of approximately 10 seconds may occur.
(2) Stopping individual outdoor units
GThe last unit to stop operating is the outdoor unit that contains the inverter compressor with the shortest
amount of operating time.
GIn 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.
2-1. Outdoor Unit Operating Rules
Because in this system all outdoor units contain an inverter compressor, ordinarily there is no absolute order of pri-
ority 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
Outdoor unit
address 3
Starts after 1 second Starts after 2 seconds Starts after 3 seconds
2. Selecting an Outdoor Unit for Operation
sec1-document.qxd:05-179 (1/2).qxd 08.8.22 1:51 PM Page 3

1
1- 4
W-2WAY ECO-i SYSTEM
Control Functions
3-1. Compressors Mounted in the Outdoor Units
[SPW-C0705DXHN8, C0905DXHN8, C1155DXHN8, C1305DXHN8, C1405DXHN8]
INV INV
Types 1305, 1405Types 905, 1155
Compressor 2 Compressor 2
Compressor 1 Compressor 1
Compressor 3
Constant
speed
Constant
speed
Constant
speed
INV
Type 705
Compressor 1
Compressor 1
Compressor 2
Compressor 3
5 hp 6 hp 5 hp
5 hp
6 hp
6 hp
–––
–––
––– –––
Scroll
Scroll
705* 905 1155 1305 1405
DC Inverter DC Inverter DC Inverter DC Inverter DC Inverter
Installed
compressor
Capacity
Rotary
hp = horsepower
* For both 50 Hz and 60 Hz.
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 com-
pressor 2.
Examples of accumulated operating time: ODU=Outdoor Unit
Suppose the following tentative system.
Compressor Selection Sequence in Cooling Mode:
All the inverter compressors are firstly selected simultaneously.
3. Compressor Control
ODU 1 ODU 2 OUD 3
Comp 1
Comp 2
Comp 3
100 hrs.
150 hrs.
110 hrs.
70 hrs.
160 hrs.
80 hrs.
140 hrs.
40 hrs.
90 hrs.
ODU 1 ODU 2 OUD 3
Comp 1
Comp 2
Comp 3
1st
6th
5th
1st
7th
3rd
1st
2nd
4th
sec1-document.qxd:05-179 (1/2).qxd 08.8.22 1:51 PM Page 4

1- 5
1
W-2WAY ECO-i SYSTEM
Control Functions
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.
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 accord-
ing 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 tem-
perature 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 in heating mode is not used for the condensation temperature detection, because it may indi-
cate the temperature of superheated gas.
3. Compressor Control
ODU 1 ODU 2 OUD 3
Comp 1
Comp 2
Comp 3
5th
8th
6th
1st
9th
3rd
7th
2nd
4th
sec1-document.qxd:05-179 (1/2).qxd 08.8.22 1:51 PM Page 5

1
1- 6
W-2WAY ECO-i SYSTEM
Control Functions
C
11.1
11.0
5.1
5.0
2.0
1.9
16.0
11.0
5.0
7.5
2.0
12.0
015 30
Horsepower increase
permitted
Horsepower increase
permitted
Area A
Area B
Area C
Area AB
Horsepower increase
prohibited
Horsepower decrease
Maximum requirement level [L]
* Depending on the maximum requirement level of the indoor unit, the judgement
temperatures for each area may vary as shown in the figure.
3-6-1. Evaporation Temperature (Te) Control: Control of Indoor Units Operating in Cooling Mode
(1) For indoor units that are operating in Cooling Mode, if one unit is selected for a test run mode, the room temper-
ature 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 (opera-
tion with inverter frequency of 25 Hz only). Subsequently if C area continues, the thermostat turns OFF.
3. Compressor Control
sec1-document.qxd:05-179 (1/2).qxd 08.8.22 1:51 PM Page 6

1- 7
1
W-2WAY ECO-i SYSTEM
Control Functions
PX
PX –0.1
48.1
48.0
48.0
47.0
43.0
42.038.0
37.0
47.0
45.0
46.9
44.9
015 30
Thermostat OFF Area D
Area C
Area B
Area A
Area AB
Horsepower decrease
Horsepower increase
prohibited
Horsepower increase
permitted
Horsepower increase
permitted
Maximum requirement level [L]
* Depending on the maximum requirement level
of the indoor unit, the judgment temperatures
for each area may vary as shown in the figure
(example).
3-6-2. Condensation Temperature (Tc) Control:
Control of Indoor Units Operating either in Cooling Mode or Heating Mode
(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 pre-
vent 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 condensa-
tion temperature. It may vary. (At the time of shipment it is 53°C.)
(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. Compressor Control
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
2
1
0
3
4
5105
104
103
Air discharge temp. level Discharge temp. Horsepower limit
100 ~ Less than 103
98 ~ Less than 100
Less than 98
Decrease by 2 horsepower
Decrease by 1 horsepower
Decrease by 0.5 horsepower
Prohibit horsepower increase
Permit horsepower increase (slowly)
No control
The values shown in the table above are reduced to the values calculated by roadmap control.
sec1-document.qxd:05-179 (1/2).qxd 08.8.22 1:51 PM Page 7

1
1- 8
W-2WAY ECO-i SYSTEM
Control Functions
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.
(2) Current Protection
Inverter compressor current control is composed of primary current control and secondary current control. Cur-
rent protection control for the inverter compressor is performed by self-protection in the inverter circuit, and
does not increase or decrease the compressor capacity.
16.0A ~16.5A
75.0A or (150℃)
13.5A
13.0A 12.5A
12.0A
90Hz80Hz
14.5A ~
13.5A ~
-
Primary current Secondary current
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. Compressor Control
sec1-document.qxd:05-179 (1/2).qxd 08.8.22 1:51 PM Page 8

1- 9
1
W-2WAY ECO-i SYSTEM
Control Functions
(2) Heating control when outdoor unit heat exchanger is acting as an evaporator
Outdoor units
Indoor
units
*When the above operation is finished, normal operation starts at the horsepower determined by the indoor units
where thermostats are ON.
Control time
RAP valve kit
Fan
Minimum 1 min Maximum 10 min [until max (pressure sensor temp., E1) 35°C]
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.
Electronic Thermostat
Expansion Valve
All outdoor units operate at the maximum horsepower.
In addition to ordinary heating and cooling operation, this system also includes the following 3 types of special con-
trols for control of the system as a whole.
1. 4-way Valve Adjustment Control
2. System refrigerant oil recovery control
3. Defrost control
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
60 seconds
Outdoor Units
Indoor
units
* When the above operation is finished, normal operation starts at the horsepower determined by the indoor units where
thermostats are ON.
Control time
Electronic Thermostat
Expansion Valve
RAP valve kit
Fan
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.
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 con-
trol 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.
4. Special Controls
sec1-document.qxd:05-179 (1/2).qxd 08.8.22 1:51 PM Page 9

1
1- 10
W-2WAY ECO-i SYSTEM
Control Functions
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
(3) Heating cycle
4-3. Defrost Control
4-3-1. Defrost Methods
This system uses the following 2 defrosting systems.
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.
Outdoor units
Indoor
units
Control time
Electronic Thermostat
Expansion Valve
RAP valve kit
Fan
All outdoor units operate at maximum horsepower.
Maximum 3 minutes (Stops once before and once after control.)
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.
Outdoor units
Indoor
units
Control time
Electronic Thermostat
Expansion Valve
RAP valve kit
Fan
All outdoor units operate at maximum horsepower.
Maximum 3 minutes (Stops once before and once after control.)
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.
4. Special Controls
System employs Defrost control method
1 outdoor unit in the refrigerant system Reverse cycle defrost
2 or more outdoor units
in the refrigerant system Outdoor unit cycle defrost
sec1-document.qxd:05-179 (1/2).qxd 08.8.22 1:51 PM Page 10

1- 11
1
W-2WAY ECO-i SYSTEM
Control Functions
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.
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 detec-
tion 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
–25
–23
–10
The frost detection area is
located under the thick lines
L2
L1
–3
–21.4
–8
–1
10
10 External temperature °C
Heat exchange liquid temperature °C
Defrosting operation
end temperature
(The end temperature
is different from the
above detection
temperature.)
Cooling mode
indoor units
E
E
E
E
E
E
E
E
E
E
EE
C
E→CE→C
E→C
E→C
E→C
E→C
E→C
E→C
C→E
C→E
C→E
C→E
C→E
C→E
C→E
Outdoor unit status
Stopped indoor units
Indoor units where fan is operating
Heating mode
indoor units
Compressor
Time
Defrost preparation Defrost in progress Defrost end
Defrost
end
judgment
Stopped Stopped
Operating Operating
1 min 1 min 1 minMax. 10 min
Thermostat ON
Thermostat ON
Thermostat OFF
Thermostat OFF
4. Special Controls
sec1-document.qxd:05-179 (1/2).qxd 08.8.22 1:51 PM Page 11

1
1- 12
W-2WAY ECO-i SYSTEM
Control Functions
Defrost
outdoor unit
Evaporator
outdoor unit
Evaporator
outdoor unit
Evaporator
outdoor unit
Evaporator
outdoor unit
Defrost
outdoor unit
Defrost
outdoor unit
Defrost
outdoor unit
Defrost
outdoor unit
Evaporator
outdoor unit
First operation Second operation
First operation Second operation
Switch
Switch
(2) Defrost sequence
Outdoor unit cycle defrost is always completed in 2 defrost operations.
(A) When there are 2 outdoor units
(B) When there are 3 outdoor units
•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
OFF
ON ON
ON
EE
ON
C
C
C
C
OFF
E
CC
CC
OFF
S
SSS S
S
SSSS
C
C
C
ON
C
E→C
E→C
OFF OFF
E or S
C→E or S
C→E
Stopped indoor unit(s)
Indoor units where fan is operating
Heating mode indoor
units
Time
Defrost
preparation
Defrost in
progress
Defrost in
progress
Defrost
end
judgment
Defrost
end
judgment
1 min 1 min1 minMax. 6 min Max. 6 min
Thermostat ON
Thermostat OFF
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
Switch
Defrost
preparation
4-3-6. Outdoor unit cycle defrost
Outdoor unit cycle defrost is performed in systems where 2 or more 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.
4. Special Controls
sec1-document.qxd:05-179 (1/2).qxd 08.8.22 1:51 PM Page 12

1- 13
1
W-2WAY ECO-i SYSTEM
Control Functions
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 10°C 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.
4. Special Controls
sec1-document.qxd:05-179 (1/2).qxd 08.8.22 1:51 PM Page 13

1
1- 14
W-2WAY ECO-i SYSTEM
Control Functions
5-1. Oil Control
5-1-1. Oil level
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.
(1) Operation when oil level is not 2.
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.
5. Other Controls
Oil level Meaning Conditions of oil Judgement
2 Sufficient
The compressor contains oil more than
the oil level which is necessary and
sufficient for normal operation.
There is no problem.
1 Slightly low
The compressor contains sufficient oil
but there is a possibility of shortage
against the required oil level.
Confirm that oil is returned after
performing the oil control operation.
0 Extremely low
The compressor oil is short against
the required oil level sufficient for normal
operation.
Confirm that oil level is recovered to the
required level after performing the oil
recovery control between systems.
sec1-document.qxd:05-179 (1/2).qxd 08.8.22 1:51 PM Page 14

1- 15
1
W-2WAY ECO-i SYSTEM
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.
(1) The OFF conditions take priority over the ON conditions for this valve.
(2) This valve is OFF when the outdoor unit is stopped.
(3) This valve is ON when special control is in progress.
(4) Control during normal operation
(A) Cooling operation
GThis valve turns ON when symptoms of insufficient refrigerant gas occur at an
indoor unit.
GThis valve turns ON when the outdoor air temperature is 15°C or below. (Under
these conditions the high pressure is low and refrigerant flow becomes poor.)
GThis valve turns OFF when symptoms of refrigerant overcharge are detected at
the outdoor unit.
(B) Mixed cooling/heating operation
GThe RCV turns ON at stopped outdoor units when the heat exchanger at anoth-
er 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 evapora-
tor 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
GThis 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.
GThis 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.
Hp
L
p
Lp
6. Operation of Solenoid Valves
sec1-document.qxd:05-179 (1/2).qxd 08.8.22 1:51 PM Page 15