Page 1
Service Manual
Page 2
1
Features
2
Specification
3
Dimensions
4
Refrigeration cycle diagram
5
Operation limits
6
Wiring diagram
7
Troubleshooting
8
Electric control functions
Page 3
1. Features
1.1 Compact design
1.2 Flexible wiring connection
There is a separate terminal in indoor unit, so it is very easy and flexible to connect the
indoor unit and outdoor unit.
1.3 Ultra strong rust proof performance, with special cataphoric treatment.
1.4 Optional panels available
Page 4
Model MB 2.6A/AR MB3.2 A/AR
Power supply
Ph-V-Hz 220-240V,50HZ 220-240V,50HZ
Capacity
Btu/h 9000 12000
Input
W 980 1300
Rated current
A 4.4 5.8
Cooling
EER
Btu/w.h 9.2 9.2
Capacity
Btu/h 9500 13000
Input
W 960 1300
Rated current
A 4.3 5.8
Heating
COP
W/W 2.9 2.9
Moisture Removal
L/h 1.0 1.2
Max. input consumption
W 1250 1400
Starting current
A 25 35
Model
PH170X1C-4DZ2 PH225X2C-4FT
Type
Rotary Rotary
Thermal protector
UP3QE0591-
T61(internal)
UP3RE0591T56(internal)
Capacitor
uF 25/370V 35/370V
Compressor
Refrigerant oil
ml SUNISO 350 SUNISO 4GSD 480
Model
R2PG20A RPG13C/RPG13C-ZWL
Input
W 30 44
Capacitor
uF 1/450V 1.5/450V
Indoor fan
motor
Speed(hi/mi/lo)
r/min 1920/1700/1500 1300/1200/1060
Indoor air flow (Hi/Mi/Lo)
m3/h 410/360/320 540/500/440
Indoor noise level (Hi/Mi/Lo)
dB(A) 42/ 37/ 34 42/38/35
Dimension (W*H*D)
mm 785X265X150 900X300X172
Packing (W*H*D)
mm 865X340X228 1020X390X260Indoor unit
Net/Gross weight
Kg 7.5/9.5 10/13
Model
YDK24-6T YDK25-6C
Input
W 70 85
Capacitor
uF 3/450V 2.5/450V
Outdoor fan
motor
Speed
r/min 850 900
Outdoor noise level
dB(A)
52 54
Dimension(W*H*D)
mm 700X535X235 780X540X250
Packing (W*H*D)
mm 815X580X325 910X575X335Outdoor unit
Net/Gross weight
Kg 30/33 36/40
Refrigerant type
g R22/620 R22/750
Design pressure
MPa 2.6 2.6
Liquid side/ Vapor side
mm(inch) Ф6.35/Ф9.53 Ф6.35/Ф12.7
Max. refrigerant pipe
length
m 10 10
Refrigerant
piping
Max. difference in level
m 5 5
Plug type
10A 16A
Application area
m2 14-21 18-26
Page 5
3.Dimensions
3.1 Indoor unit
MB2.6A/AR
MB3.2A/AR
Page 6
3.2 Outdoor unit MB2.3A/AR
3.3 Outdoor unit MB3.2A/AR
Page 7
4.Refrigeration cycle diagram
4.1 Cooling/heating
Indoor unit outdoor unit
Val ve
Sensor of room temp
.
4 way valve
Heat exchanger Heat exchanger
Compressor
Sensor of heat exchanger temp
Valve Capillary
4.2 Cooling only
Indoor unit outdoor unit
Val ve
Sensor of room temp
.
Heat exchanger Heat exchanger
Se nsor of heat exchanger temp
.
Compressor
Valve Capillary
Page 8
5.Operation limits
5.1Cooling operation
Outdoor unit air temp. °C DB
45
40
35
30
25
20
10 15 20 25 30 35 40
Indoor
air temp.
°C DB
Note : The chart is the result from the continuous operation under constant air temperature
conditions. However, excludes the initial pull-down stage.
5.2 Heating operation
Indoor air temp. °C DB
30
25
20
15
10
5
-5 5 15 25
Outdoor unit air temp. °C DB
Note : The chart is the result from the continuous operation under constant air
temperature conditions. However, excludes the initial pull-down stage.
DRY COOLING
Page 9
6.Wiring diagram
6.1 Cooling only
MB2.6A/AR
MB3.2A/AR
Page 10
Outdoor unit
RED
COMPRESSOR
CAPACITOR
1 2(N)
OUTDOOR UNIT
OVERLOAD
RELAY
COMPRESSOR
S
C
RED
BLUE
R
BLACK
BLACK
FAN
CAPACITOR
Y£¦G
RED
FAN
MOTOR
BLUE
BLACK
RED
Y£¦G
Y£¦G
INDOOR UNIT
Page 11
6.2 Heating/cooling
MB2.6A/AR
MB3.2A/AR
Page 12
Outdoor unit
Page 13
7.Troubleshooting(MB2.6-3.2A/AR)
7.1 For all cooling only model
Failure phenomenon Operation lamp Timer lamp
Indoor fan speed has been out of control for over 1 minute X
Indoor room temp. or evaporator sensor is open circuit or short
circuit
On
Over current protection of the compressor occurs 4 times X
EEROM error On
r Extinguish
Flash at 5Hz
7.2 For all heat pump model
Failure phenomenon Operation lamp Timer lamp Defrosting lamp
Over current protection of the compressor occurs 4 times X
Indoor fan speed has been out of control for over 1 minute X
No over-zero signal
Temp. sensor on indoor evaporator is open circuit or short circuit X X
Indoor room temp. sensor is open circuit or short circuit X X
EEROM error On X
r Extinguish
Flash at 5Hz
8. Electric control functions
8.1 Electric Control working environment
8.1.1 Input voltage: 175~253V
8.1.2 Input power frequency:50Hz
8.1.3 Ambient temperature: -7°C~+43°C
8.1.4 Indoor fan normal working amp is less than 1A,
8.1.5 Outdoor fan. Normal working amp is less than 1.5A
8.1.6 Four-way valve normal working amp is less than 1A.
8.1.7 Swing motor: DC12V.
8.1.8 Compressor: single-phase power supply. Its normal working amp is less than 15A
8.2 Proper symbols and their meanings:
TA: Indoor ambient temperature
TE: Indoor evaporator temperature
TS: Setting temperature through the remote controller
I
3sec
: Self-protection amp of compressor, continue three seconds until turns off the
compressor.
I
5MIN
: Self-protection amp of compressor, continue five minutes until turns off the compressor.
I
FAN
: Self-protection amp of outdoor fan/indoor fans when they change from higher wind to
lower wind.
I
RESTORE
: Amp self-protection return value
TH
DEFROST
: High wind, defrosting temperature difference
TM
DEFROST
: Middle wind, defrosting temperature difference
TL
DEFROST
: Low wind, defrosting temperature difference
TE1: Anti-cold wind, from Fan Off to Breeze temperature
TE2: Anti-cold wind, from Breeze to Setting Fan Speed temperature
TE3: Anti-cold wind, from Setting Fan Speed to Breeze temperature
TE4: Anti-cold wind, from Breeze to Fan Off temperature
TE5: Evaporator low temperature protection entering temperature
TE6: Evaporator low temperature protection restoring temperature
TE7: Evaporator high temperature protection, compressor off temperature
TE8: Evaporator high temperature protection, fan off temperature
Page 14
TE9: Evaporator high temperature protection, restoring temperature
8.3 Systematic functions
Remote receiving
Testing and forced run
Position set for indoor unit wind flap.
LED displaying and alarm
On or off Timer
Protection for the compressor
Current protection
High temperature protection of indoor heat exchanger at heating mode
Auto defrosting and heating recovery at heating mode
Anti-cold air at heating mode
Anti-frozen at heating mode
8.4 Protection
8.4.1 The compressor functions protection with a delay of three minutes.
8.4.2 Sensor protection at open circuit and breaking disconnection
8.4.3 Temperature Fuse break protection
8.4.4 Fan Speed is out of control. When Indoor Fan Speed is too high(higher than High
Fan+300RPM)or too low(lower than 400RPM), the unit stops and LED displays
failure information and can’t returns to normal operation automatically.
8.4.5 Cross Zero signal error warning. If there is no Cross Zero signals in 4 minutes(4
seconds in quick check), the unit stops and LED displays failure information and
can’t returns to normal operation automatically.
8.4.6 The current protection of the compressor.
Page 15
8.4.7
Condition Indoor fan Compressor Outdoor fan Remark
I< I
RESTORE
On On On
On On Off Heating modeI
RESTORE
<I< I
FAN
Low speed On On Cooling mode
I
FAN
<I<I
5MIN
Off Off After 5 Minutes
Current up
I
5MIN
<I< I
3SEC
Off Off After 3 Seconds
I
5MIN
<I< I
3SEC
Off Off After 3 Seconds
I
FAN
<I<I
5MIN
Off Off After 5 Minutes
On On Off Heating modeI
RESTORE
<I< I
FAN
Low speed On On Cooling mode
Current
down
I< I
RESTORE
On On On
If compressor turns off for continuously 4 times due to Current protection in 5
minutes from Compressor On, the unit stops and LED displays failure information
and can’t returns to normal operation automatically.
8.5 Fan-only mode
Fan speed can be set to high/mid/low/ Auto.
8.6 Cooling mode
The 4-way valve is closed at cooling mode.
The action of the compressor and the outdoor fan:
Condition Compressor Outdoor fan
T> Ts+1 On OnTe m p . u p
T<Ts+1 Off Off
T> Ts On OnTemp. down
T<Ts Off Off
Auto fan
Condition
T=Indoor Temp.-Setting Temp.
Indoor fan speed
T<3°C Low
3°C <T<5°C Med.
Te m p . u p
T>5°C High
T> 3°C High
1°C <T<3°C Med.
Temp. down
T<1°C Low
Anti-freezing control to indoor evaporator ( T: evaporator temp. )
Condition
Te m p. Time
Compressor Outdoor fan
T> TE6 On OnTe m p . u p
T< TE6 >5 Minutes Off Off
T> TE5 On OnTemp. down
T< TE5 Off Off
8.7 Dehumidifying mode
8.7.1 The 4-way valve is off at dehumidifying mode
8.7.2 Compressor and Indoor Fan actions in dehumidifying mode
Page 16
Repeat on and off cycle.
8.7.3 Low room temperature protection:, When room temperature decreases to below 10°C ,
compressor and outdoor fan will stop(indoor fan is Breeze). Dehumidifying operation
will be resumed when room temperature restores to over 13°C .
8.7.4 At dehumidifying mode, the anti-freezing function of the indoor heat exchanger is the
same as that of cooling mode.
8.7.5 At dehumidifying mode, the action of fans of indoor is the same as that of air-only
mode.
8.8 Heating mode
8.8.1 Generally, the 4-way valve is open in heating mode, but it is closed in defrosting mode.
4-way valve must delay 2 minutes compared with compressor if the compressor
changed into non-heating mode or turned off. 4-way valve doesn't delay in
dehumidifying mode.
8.8.2 Generally, the outdoor fan is turned off with the on-off action of compressor in heating
mode, except for the defrosting mode or the end of defrost.
8.8.3 Action of compressor at heating mode: compressor must run for 7 minutes after starting
and then judge temperature. Meanwhile other protections are still valid.
Condition Compressor Outdoor fan
T> Ts+3 Off OffRoom temp. up
T<Ts+3 On On
T< Ts+2 On OnRoom temp. down
T>Ts+2 Off Off
8.8.4 Indoor Fan actions at heating mode
Indoor Fan can be set at HIGH/MID/LOW/AUTO by using a remote controller, but Anti-cold
wind function prevails.
Condition
T= Indoor exchanger temp.
Indoor fan speed
T<TE1 Off
TE1<T<TE2 Breeze
Indoor exchanger temp. up
T>TE2 Setting fan speed
T> TE3 Setting fan speed
TE3<T<TE4 Breeze
Indoor exchanger temp. down
T<TE4 Off
Auto wind
Condition
T=Indoor Temp.-Setting Temp.
Indoor fan speed
T<2 HighRoom temp. up
T>2°C Med.
T> 0°C Med.Room temp. down
T<0°C High
NO Conditions
Indoor Fan Compressor and Outdoor Fan
1 TA ≥ TS+2
LOW
BREEZE
ON 6 minutes
OFF 4minutes
2 TS ≤TA TS +2
LOW
BREEZE
ON 5minutes
OFF 5minutes
3 TA TS
LOW
BREEZE
ON 4minutes
OFF 6minutes
Page 17
Indoor evaporator high-temperature protection
Condition
T= Indoor exchanger temp.
Compressor Outdoor fan
T<TE8 On On
TE8<T<TE7 On Off
Indoor exchanger temp. up
T>TE7 Off Off
T>TE9 Off Off
Indoor exchanger temp. down
T<TE9 On On
The louver opens to Standard Angle ANGLHEAT when power is on for the first time
8.9 Defrosting operation (Available for heating only).
8.9.1 Defrosting condition: Defrosting starts when either of the following (1)&(2):
(1) A and B are satisfied:
A: The compressor keeps running for 40 minutes or more.
B: The temperature difference of evaporator and room temperature meets one of the
following:
°C
Temp. of evaporator---room temp.
Fan speed is high ≤TH
DEFROST
Fan speed is mid ≤TM
DEFROST
Fan speed is low ≤TL
DEFROST
Breeze Meet only if it is Breeze
(2)Calculate from the end of latest defrost, evaporator high temp. protection only closes
outdoor fan with the compressor still running. Add up to 90 minutes.
Page 18
8.9.2 Defrosting time
If the temp. difference condition (1) is satisfied for less than 40 minutes, this can be
regarded as severe frosting. The defrosting time is 10 minutes.
If the temp. difference condition (2) is satisfied for more than 40 minutes, the
defrosting time is 6 minutes.
If the temp. difference condition (1) is satisfied out of 40 minutes, generally the
defrosting time is 6 minutes, after three continuous 6-minute defrosting time, the fourth
defrosting time is 10 minutes . The circulation is as following:
6-minute defrost→6-minute defrost→6-minute defrost→10-minute defrost→
8.9.3 Ending condition of defrosting
If one of following conditions is satisfied, end the defrost and turn into heating mode:
(1) The defrost time has reached to 6 or 10 minutes.
(2) The compressor current has reached to I
DEFROST
or above, I
DEROST
differs in
different models.
8.9.4 Defrosting Actions:
Defrost 10or 6minutes
45S 25S
Compressor
4-way Valve 23S
40S
Outdoor Fan
Indoor Fan
10S
Page 19
8.10 Automatic operation mode
When running in automatic mode, the air conditioner automatically selects one of the
following operation modes: cooling, heating or fan only according to the temp. difference
between room temp. (TA) and set temp. (TS).
TA—T S Operation mode
TA—T S>2°C Cooling
-1°C ≤TA—TS≤+2°C Fan-only
TA—T S<-1°C Heating (air-only for cooling only type)
at auto mode, the indoor fan blows automatically in selected mode.
at auto mode, the motion of indoor flap should accord with the selected operation mode.
One mode should be carried out for at least 15 minutes once selected. If the compressor
cannot start for 15 minutes, reselect the operation mode according to the room temp. and set
temp., or reselect when the set temp. varies.
8.11 Forced cooling function
A: Select forced cooling function with the forced cooling button or the switch.
B: The compressor is unconditionally turned on, after 30 minutes cooling operation whose fan
mode is set as low, the A/C operates at DRY mode with a set temp. of 24°C .
C: All protections of remote control cooling are available at forced cooling operation.
8.12 Forced Auto function
A: Select forced auto function with the forced auto button or the switch.
B: In forced auto status the A/C operates at remote control mode with a set temp. of 24°C .
8.13 Timer Function
8.14 Economic Running
Cooling: The set temperature rise 1°C per hour. Two hours later, the set temperature will
maintain as a constant and the air circulation is kept at low speed.
Heating: The set temperature decrease 1°C per hour. Two hours later, the set
temperature will maintain as a constant and the air circulation is kept at low speed (Cold air
proof function takes priority over all).
Auto: The economic running function operates in accordance with the selected running
mode by the auto mode.
8.15 Auto restart Function (only for AR series)
In case of a sudden power failure, this function automatically sets the unit to previous
settings before the power failure when power returns.
Page 20
8.16 Models and Parameters
Model MB2.6A/AR MB3.2A/AR
I3SEC 10.0A 11.0A
I5MIN 7.5A 10.0A
IFAN 5.5A 8.0A
IRESTORE 4.5A 6.0A
IDEFROST 4.5A 5.5A
TE1 28°C 28°C
TE2 32°C 32°C
TE3 30°C 30°C
TE4 20°C 20°C
TE5 2°C 2°C
TE6 7°C 7°C
TE7 60°C 60°C
TE8 53°C 53°C
TE9 50°C 50°C
200° 200°
45° 45°
ANGLOFF 100° 100°
TH
DEFROST
14°C 14°C
TM
DEFROST
15°C 15°C
TL
DEFROST
16°C 16°C
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