Rotenso RONI R26Xi R16 User manual

www.rotenso.com
EN
IDU&ODU UNITS
SERIES
SERVICE MANUAL
MODELS:
R26Xi R16/R26Xo R16
R35Xi R16/R35Xo R16
R50Xi R15/R50Xo R15
R70Xi R15/ R70Xo R15
RONI

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2
CONTENTS
Part ⅠTechnical Information
1. Important Notice .................................................................................3
2. Refrigeration cycle diagram ..............................................................4
3. Product Dimensions……………………………………………………….5
4. Wiring diagram ...................................................................................6
5. Electronic Controller Introduction ....................................................7
4.1 Electronic Controller ...................................................................7
4.2 WIFI OPERATION MAUAL .........................................................13
PART ⅡInstallation and Maintenance...................................................14
1. Notes for installation and maintenance..........................................18
2 Installation..........................................................................................21
2.1 Installation Dimension Diagram ...............................................21
2.2 Accessory ..................................................................................22
2.3 Tools ...........................................................................................22
2.4 Position ......................................................................................23
2.5 Electricity and wiring ................................................................23
2.6 IDU Installation ..........................................................................23
2.7 ODU Installation.........................................................................26
2.8 Vacuum and gas leakage test ...................................................27
2.9 Final test.....................................................................................27
3. Maintenance......................................................................................28
3.1 Failure code ...............................................................................28
3.2 Trouble shooting .......................................................................30
4. Disassembly IDU & ODU..................................................................53
4.1. IDU Disassembly ......................................................................53
4.2 ODU Assembly...........................................................................57
APPENDIX..................................................................................................62
Appendix 1 The comparison table of Celsius-Fahrenheit temperature
...............................................................................................................62
Appendix 2 The Pipe length and Gas charging .................................62
Appendix 3 Pipes Flaring.....................................................................64
Appendix 4 THERMISTOR TEMPERATURE CHARACTERISTICS .....65

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Part ⅠTechnical Information
1. Important Notice
This service manual is intended for use by individuals possessing adequate
backgrounds of electrical, electronic
and mechanical experience. Any attempt to repair the appliance may result in personal injury and property
damage. The manufacturer or seller cannot be responsible for the interpretation of this information, nor can
it assume any liability in connection with its use.
The information, specifications and parameter are subject to change due to technical modification or improvement
without any prior notice. The accurate specifications are presented on the nameplate label.

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2.Refrigeration cycle diagram
Heat pump
9K, 12K
Liquid side
2-way valve
Gas side
3-way valve
Compressor
4-way valve
Muffler
Muffler
Heat exchange
(Condenser)
Heat exchange
(Evaporator)
Check valve
Cooling
Heating
Capillary
Liquid side
2-way valve
Gas side
3-way valve
Compressor
4-way valve
Muffler
Muffler
Heat exchange
(Condenser)
Heat exchange
(Evaporator)
Electronic
expansion valve
Cooling
Heating
18K, 24K

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3. Product Dimensions
Indoor Unit:
Outdoor Unit:
Model
Indoor unit
Outdoor unit
A
B
C
D
E
F
G
H
I
J
K
R26Xi R16 / R26Xo R16
698
190
255
660
459
224
362
276
256.2
48
52
R35Xi R16 / R35Xo R16
777
205
250
660
459
224
362
276
256.2
48
52
R50Xi R15 / R50Xo R15 910
205
292 794 602 288 516 349 314 53.9
52
R70Xi R15 / R70Xo R15 1010 220 315 845 693 336 586 374.9 347.5 58.6 63

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4. Wiring diagram
MODEL: R26Xi R16/R26Xo R16, R35Xi R16/R35Xo R16, R50Xi R15/R50Xo R15, R70Xi R15/R70Xo R15
INDOOR UNIT：
OUTDOOR UNIT
θ
θ
θ

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5. Electronic Controller Introduction
5.1 Electronic Controller
RT-------Room Temperature.
IPT------Indoor Pipe (Coil) Temperature.
ST------Indoor Setting Temperature.
OPT---Outdoor Pipe Temperature.
OAT---Outdoor Ambient Temperature.
ODT---Outdoor Discharge Temperature.
CRT---Compensated Room Temperature.
IDU--- Indoor unit
ODU---Outdoor unit.
Note: When AC finishing installation, because of the air ventilation and the distance of temperature test sensor to
different location of the house, the temperature for IDU PCB control need compensation.
1. Cooling mode. CRT=RT;
2. Heating mode. CRT=RT-3℃-----Split AC.
5.1.1 Auto mode
1. The set temperature can be adjusted from 16-31℃ on auto mode, the operation of fan speed and vane position
according to preset.
2. Operation
When unit set to auto mode, it will work on cooling, heating or fan mode totally according to Δt --the temperature
difference between RT and ST shown as table:
Mode
Δt=RT-ST
COOLING
Δt >1℃
FAN
-1℃≤Δt≤1℃
HEATING
Δt <-1℃
5.1.2 Cooling mode
1. Temperature control :16-31℃, and the operation of fan speed and vane position according to preset.
2. Compressor and process control
1). When RT-ST≥0.5℃, the compressor starts up working, AC operates as customer preset;
2). When
a. RT-ST≤－3℃ and compressor keeps 2 min continuously; or
b. RT-ST≤－2℃ and compressor works in lowest frequency for 5 min continuously; or
c. RT-ST≤－1℃ and compressor works in lowest frequency for 10 min continuously,
The compressor stops operation.
3). The compressor frequency control: Based on relation of RT & ST, and the changing speed of RT.
4). The compressor will also stop working while unit:
a. switched off.
b. under protection.
c. changed to fan mode.
5). Under normal operation, the compressor can be stopped by program only working after 7 min once it starts up.
6). In the process of unit operation, once the compressor ceased, it should be 3 min delay for the next procedure.
3. ODU Fan motor control:
1). While unit:
a. switched off.
b. under protection.
c. to the set temperature.
After compressor ceased, the fan motor stops working according to the temperature of OPT and OAT, the max delay
for the motor should be less than 160s.
2). When switch on unit on cooling mode, ODU fan motor will delay 5s after compressor starts up.
4. When ODU failure or stops for protection, IDU works as preset.
5. Anti-frosting protection
Control the unit operation frequency and the frequency changing rate to achieve anti-frosting protection.

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1). Frequency Slowly Increasing(FSI):
a. If 6℃≤IPT＜7℃, the frequency increasing rate is 1Hz/60s, slowly increasing operation speed.
b. When IPT≥7℃, unit quit from protection.
2). Frequency Limitation:
If 5℃≤IPT＜6℃, the compressor frequency forbidden to increase
3). Normal Frequency Decreasing (NFD):
If 3℃≤IPT＜4℃, the frequency decreasing rate is 8Hz/90s, until to the lower frequency limit.
4). Fast Frequency Decreasing (FFD):
If 2℃≤IPT＜3℃, the frequency decreasing rate is 16Hz/90s, until to the lower frequency limit.
5). Unit stop:
a. When IPT＜1℃for 3min continuously, unit stops working for anti-defrosting protection.
b. While IPT＞6℃, and the unit stopped for 3 min already, can the unit recover to operation.
0℃
-1℃
-2℃
-3℃
RT-ST
COMPRESSOR
OUTDOOR FAN
INDOOR FAN
160S
160S
10min.
5min. 2min.
ON OFF
5s
0.5℃
≥ 7min.
≥3min.
5.1.3 Dry mode
1. Temperature control: 16~31℃.
Fan speed: low
Vane blade position: as customer preset
2. When ODU failure or stops for protection, IDU works as preset.
3. Failure protection: as cooling mode.
4. Energy saving and sleep mode: Invalid.
5.1.4 Heating mode
1. Temperature control: 16-31℃.
2. Compressor and process control.
1). When ST-CRT≥0.5℃, the compressor starts up working, AC operates as customer preset;;
2). When
a. ST-CRT≤－3℃ and compressor keeps 2 min continuously; or
b. ST-CRT≤－2℃ and compressor works in lowest frequency for 5 min continuously; or
c. RT-CRT≤－1℃ and compressor works in lowest frequency for 10 min continuously,
The compressor stops operation.
3). The compressor frequency control: Based on relation of RT & ST, and the changing speed of RT.
4). The compressor will also stop working while unit:
a. switched off.
b. under protection.
c. changed to fan mode.
5). Under normal operation, the compressor can be stopped by program only working after 7 min once it starts up.
6). In the process of unit operation, once the compressor ceased, it should be 3 min delay for the next procedure.
3. IDU time delay: When compressor stops or unit switches off while in heating mode, IDU fan motor will work for a
few seconds more to prevent overheat.

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4: ODU Fan motor control:
1). While unit:
a. To be switched off
b. Under protection.
c. To the set temperature
After compressor ceased, the fan motor stops working according to the temperature of OPT and OAT, the max delay
for the motor should be less than 160s.
2). When switch on unit on heating mode, ODU fan motor will delay 5s after compressor starts up
3). in the process of defrosting, the fan motor will stop operation 48s delay after compressor stopped.
4). defrosting finish, the compressor stops operation, the fan motor will start working simultaneously.
5. 4-way valve control
1). On Cooling/Dry/Fan mode,4-way valve: OFF, when unit switched on heating mode,4-way valve: ON.
2). When heating mode switched off, or changed from heating to other modes, the 4-way valve will be OFF 2 min
delay after the compressor stops working.
3). Unit stops working caused by any kind of protection, the 4-way valve will be OFF 4 min delay.
4). In the process of defrosting, 4-way valve will be OFF 43s delay after compressor stopped.
5). When defrosting finish, the compressor stops operation, 4-way valve will be ON after 43s delay.
0 ℃
-1℃
-2℃
-3℃
ST-CRT
COMPRESSOR
OUTDOOR FAN
INDOOR FAN
2 min.
10 min.
5min.
≥ 7min.
160S
160S
≥3min.
4-way VALVE
5s
ON OFF
0.5℃
≤2min. ≤2min.
6. Defrost
Note: t1: compressor continuous works time.
t2: AC unit operation first time going to defrost circle.
t3: compressor accumulated working time (when OPT≤3℃ unit starts to count the time for t3).
When AC unit working to:
t1≥t2, or
t3≤t1＜t2.
and also the temperature (related to OAT & OPT) tested 3 min continuously meets for defrosting.
Defrosting start up: Compressor stops working, and re-starts to working after 50s delay;
Conditions for quitting defrosting
After defrosting 60s, and OAT≥12℃; or
OAT＜－5℃, and OPT ≥8℃ for 80s continuously; or
The defrosting for 10 min.
When AC meet any of condition a, b or c, defrosting finish.
COMPRESSOR
ON
OUTDOOR FAN
4-way VALVE
OFF
50S 50S
43S
48S Defrosting max time
43s

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Defrosting end off: Compressor stops working, and re-starts to working after 50s delay;
7. Cold air prevention:
This function intends to prevent cold air from being discharged when the heating operation starts up
1). IDU fan motor cold air prevention
.When RT＜24℃:
a. If ITP＞31℃ while compressor works for 5 min, fan motor will work according to preset fan speed.
b. If IPT≤31℃, fan motor stops working while compressor operation within 2min, if IPT≥27℃, fan motor works in low
speed 2 min, then change to preset speed.
When RT≥24℃:
a. Within 2 min after compressor start up working, once IPT＞27℃, fan motor will change to preset speed.
b. After compressor starts working 2 min, fan motor change to preset speed directly.
2). Vane blade operation for cold air prevention.
If the vane works on status of non-swing: While IPT increase to a special degree, the vane blade will change the position
to:
Default angle; or
Previous position; or
Customer preset.
The above operation can work one time only, when compressor stops working, the unit will once again inspect the function.
If the vane works on swing: When IDU quits from cold air prevention, vane operate as preset.
8. “8℃” Heating
When function effective, it will make sure the room temperature not lower than 8℃, unit works on heating mode.
5.1.5 Fan mode
1. The temperature setting: 16~31℃,
Fan speed and vane position: as preset. The function for remote controller 58E only.
2. For above function, when unit preset to be auto fan mode, the fan motor will change its operation speed based on
the temperature difference of ambient and preset temperature.
3. ODU always OFF.
5.1.6 Timer
The unit has times control, when the unit meet the timer preset, it will be switched on or off automatically.
TIMER ON
1). TIMER ON can be set only when the air conditioner is OFF.
2). Press TIMER on the remote control ONCE to enter time setting.
3). Press “▲” or “▼” to set the time for unit to start working.
4). Set other function as MODE, FAN SPEED, SWING etc.
5). Press TIMER ONCE AGAIN to confirm the TIME ON setting
TIMER OFF
1). TIMER OFF can be set only when the air conditioner is ON.
2). Press TIMER on the remote control ONCE to enter time setting.
3). Press “▲” or “▼” to set the time for unit to stop working.
4). Press TIMER ONCE AGAIN to confirm the TIME OFF setting
Note: In case of no selection for the time setting within 10s, the timer function will be OFF automatically.
℃
4
2
0
δt comes down
δt goes up
High fan
Mid fan
Low fan
2℃
4℃