Carrier ALLEGRO 42HQE009N User manual

42HQE - 38YE
SERVICE MANUAL
42HQE009N
42HQE012N
38YE009
38YE012N
42HQE018N
38YE018

Service Manual
Split Wall-Mounted Type
Room Air Conditioner
(ALLEGRO SERIES)
Model applied:
42HQE009N/38YE009
42HQE012N/38YE012N
42HQE018N/38YE018

Contents
1. Features 60
2. Specification 61
3. Dimensions 67
4. Refrigeration cycle diagram 70
5. Operation limits 71
6. Wiring diagram 72
2
7. Specification of electrical parts
8. Troubleshooting 80
3
4
6
8
9
10
13
14
14
21
9. Electronic function
10. Exploded view and spare parts list

3
1. Features
1.1 Compact design.
1.2 Quiet operation.
1.3 Anti-icing function at cooling mode.
1.4 Anti-cold air function at heating mode.
1.5 Auto-defrosting and heating recovering function at heating mode.
1.6 Outdoor unit overload current protection.
1.7 Restart function.
1.8 24 hours on/off mode time setting.
1.9 Error self diagnosis function.

4
2.Specification
Model 42HQE009N/38YE009 42HQE012N/38YE012N 42HQE018N/38YE018
Power supply Ph-V-Hz 1, 220-240V~, 50Hz 1, 220-240V~, 50Hz 1, 220-240V~, 50Hz
Capacity Btu/h 9000 12000 17000
Rated Input W1040 1320 1980
Rated current A4.6 5.8 8.9
Cooling
EERW/W2.502.66 2.42
Capacity Btu/h
10500 14000 21000
Rated Input W
1150 1360 2200
Rated current A5.0 6.0 9.9
Heating
COP W/W
2.7 3.02 2.82
MoistureRemoval L/h 1.0 1.2 1.6
Max. input consumption W 1250 1700 2600
Max.current A 6 7.8 13.0
StartingcurrentA19.825 45
Model PG180X1C-4FT3 PG225X2C-4FT PG330*2CS-4KU3
Type Rotary Rotary Rotary
Brand TOSHIBA TOSHIBA TOSHIBA
Capacity Btu/h 10800 13550/13700 20130/20267
Input W1015 1290/1335 1980/2105
Rated current(RLA) A4.5 6.1 9.7/10.3
Thermal protector UP3SE0591-T61 UP3RE0591-T56 Internal
Capacitor uF 30 35 40UF/370V
Compressor
Refrigerant oil ml
RB68AF/T68/α68TF
400
RB68AF/T68/α68TF
480
750
Model RPG13H RPG20D RPG25
Brand Welling Welling Welling
Input W 38.5 49.2 53
Capacitor uF 1.2 1.5 1.5
Indoor fan motor
Speed(hi/mi/lo) r/min 1100/1020/950 1060/900/800 1260/1100/1000
a.Number of rows 2 2 2
b.Tube pitch(a)xrow pitch(b) mm 21x13.37 21×13.37 21×13.37
c.Fin spacing mm 1.3 1.3 1.3
d.Fin type (code) Hydrophilic aluminium Hydrophilic aluminium Hydrophilic aluminium
e.Tube outside dia.and type mm φ7 Innergroove tube φ7, innergroove tube φ7,innergroove tube
f.Coil length x height x width mm 578X252X26.74 635×315×27.34 660×231×27.34
Indoor coil
g.Number of circuits 2 2 3
Indoor fan Type mm Crossflow Crossflow Crossflow
Indoor air flow (Hi/Mi/Lo) m3/h 470/440/410 580/550/520 800/770/740
Indoor Sound pressure (Hi/Mi/Lo)
(LPA) @cooling
dB(A) 39/35/33 38/34/32 46/43/40
Indoor Sound power (Hi/Mi/Lo)
(LWA) @cooling
dB(A) 54/51/48 52/48/47

5
Dimension (W*H*D) mm 750x250x188 815X280X195 906X286X235
Packing (W*H*D) mm 830x336x280 915X360X275 1020X380X328
Indoor unit
Net/Gross weight Kg 8.5/10.5 10.5/13.5 13.5/16.5
Model YDK25-6C YDK25-6C YDK53-6K
Brand Welling WELLING WELLING
Input W85 85 93
CapacitoruF2.52.5μF/450V 3.0µF/450V
Outdoor fan motor
Speed r/min 900 900 640
a.Number of rows1 22
b.Tube pitch(a)xrow pitch(b) mm 25.4X22 21x13.37 25.4x22
c.Finspacingmm1.41.5 1.7
d.Fin type (code) Hydrophilic aluminium Hydrophilic aluminium Hydrophilic aluminium
e.Tube outside dia.and type mmФ9.53,innergroove tube Ф7,innergroove tube Ф9.53,innergroove tube
f.Coil length x height x width mm 754X508X22 750×508×26.74 797x660x44
Outdoor coil
g.Number of circuits2 24
Outdoor fan Type and Diameter mm Propeller Propeller Propeller
Outdoor air flow m3/h 1900 1900 2300
Outdoor Sound pressure
(LPA) @cooling
dB(A) 52 52 54
Outdoor Sound power
(LWA) @cooling
dB(A) 62 62
Dimension(W*H*D) mm 780X540X250 780×540×250 845X695X335
Packing (W*H*D) mm 910X575X335 910×575×335 970X770X395
Outdoor unit
Net/Gross weight Kg 36/39 37/40 55/60
Refrigerant type R407c g840 1150 2100
Design pressure MPa 2.8 2.8 2.8
Liquid side/ Gas side mm(inch) Ф6.35/Ф9.53 Ф6.35/Ф12.7 Ф6.35/Ф12.7
Max. refrigerant pipe length m 10 10 15
Refrigerant piping
Max. difference in level m 5 5 8
A
dditional refrigerant
charge over 5m
g/m 30 30 30
Main mm
Φ2.5*1.5*650 Φ3.2*1.7*850 Φ3.2*1.9*820
Expansion device
(Capillary)Sub mm
Φ2.5*1.5*750 Φ3.2*1.7*800 Φ3.2*1.9*500
Operationtemp ℃17-30 17-30 17-30
A
mbienttemp ℃—7-43 —7-43 —7-43
A
pplication area m2 14-21 18-26 30-40
Remarks:
1.Cooling capacities are based on indoor air temp. 27℃DB, 19℃WB and outdoor air temp. 35℃DB,
and 24℃WB. Heating capacities are based on indoor air temp. 20℃DB, 15℃WB and outdoor air
temp. 7℃DB, and 6℃WB.
2. Indoor Sound Pressure level is measured in free field (JIS 9612 std) at 1m distance.
Outdoor Sound Pressure level is measured in hemispherical field, at 4m distance from the unit.
these values are normally somewhat different as a result of ambient condition.

3. Dimensions
3.1 Indoor unit 42HQE009N
3.2 Indoor unit 42HQE012N
6

3.3 Indoor unit 42HQE018N
3.4 Outdoor unit 38YE009 / 38YE012N
3.5 Outdoor unit 38YE018N
12. 5
7

4. Refrigeration cycle diagram
Cooling & heating
Indoor unit outdoor unit
8
Auxiliary accumulator for 12K
Valve
Sensor of room temp
. 4wayvalve
Heat exchanger Heat exchanger
Sensor of heat exchanger temp Accumulator
.
Compressor
Valve Capillary

5.Operation limits
5.1Cooling operation
Outdoor unit air temp.℃DB
45
9
40
35
30
25
20
10 15 20 25 30 35 40
Indoor air temp. ℃DB
Note : The chart is the result from the continuous operation under constant air temperature
conditions. However, excludes the initial pull-down stage.
5.2Heating operation
Indoor air temp. ℃DB
30
25
20
15
10
5
DRY COOLING
-5 5 15 25
Outdoor unit air temp.℃DB
Note : The chart is the result from the continuous operation under constant air
temperature conditions. However, excludes the initial pull-down stage.

6. Wiring diagram
6.1 42HQE009N/ 38YE009
10

6.2 42HQE012N/ 38YE012N
11

6.3 42HQE018N / 38YE018
YELLOW
CN5
LOUV E R MOTOR
CN8
AMBI ENT SENSOR
CN3
SENSOR
CN1 0
CN7
HEAT EXCHANGER
LOUV E R MOTOR
CN6
INDOOR MOTOR
GREEN
BL ACK
WHI T E
TRANSFORMER
DI SPL AY BOARD
SWI T CH B OARD
CN1 2
CN9
COMPRESSOR RE L A Y
CURRE NT DE T E CT OR
WHI T E
CN1
CN4
BROWN
BL UE
CN1 4
CN2
12

13
7. Specification of electrical parts
7.1 Temperature-resistance of room temp. sensor & pipe temp. sensor
Temperature
℃
Resistance
KΩ
Temperature
℃
Resistance
KΩ
Temperature
℃
Resistance
KΩ
-10 62.28 17 14.618 44 4.3874
-9 58.71 18 13.918 45 4.2126
-8 56.37 19 13.263 46 4.0459
-7 52.24 20 12.643 47 3.8867
-6 49.32 21 12.056 48 3.7348
-5 46.57 22 11.5 49 3.5896
-4 44 23 10.973 50 3.451
-3 41.59 24 10.474 51 3.3185
-2 39.82 25 10 52 3.1918
-1 37.2 26 9.5507 53 3.0707
0 35.2 27 9.1245 54 2.959
1 33.33 28 8.7198 55 2.8442
2 31.56 29 8.3357 56 2.7382
3 29.91 30 7.9708 57 2.6368
4 28.35 31 7.6241 58 2.5397
5 26.88 32 7.2946 59 2.4468
6 25.5 33 6.9814 60 2.3577
7 24.19 34 6.6835 61 2.2725
8 22.57 35 6.4002 62 2.1907
9 21.81 36 6.1306 63 2.1124
10 20.72 37 5.8736 64 2.0373
11 19.69 38 5.6296 65 1.9653
12 18.72 39 5.3969 66 1.8963
13 17.8 40 5.1752 67 1.830
14 16.93 41 4.9639 68 1.7665
15 16.12 42 4.7625 69 1.7055
16 15.34 43 4.5705 70 1.6469
7.2Compressor windings resistance (run & start winding @20℃)
Compressor model PG180X1C-4DZ3 PG225X2C-4FT PG330*2CS-4KU3
Winding 1 (Main) 3.33±5% 2.35±5% 1.54±5%
Winding 2 (Sub) 3.78±5% 3.22±5% 3.04±5%
7.3Indoor fan motor windings resistance (@20℃).
Motor model RPG13H RPG20D RPG25
Winding 1 (Main) 400 327 209±8%Ω
Winding 2 (Sub) 430 380 376±8%Ω

14
7.4Outdoor fan motor windings resistance(@20℃).
Motor model YDK25-6C YDK53-6K
Winding 1 (Main) 17073±8%
Winding 2 (Sub) 195134±8%Ω
8. Troubleshooting
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
rExtinguish
☆ Flash at 5Hz
9. Electronic function
9.1 Electric Control working environment
9.1.1 Input voltage: 175~253V
9.1.2 Input power frequency:50Hz
9.1.3 Ambient temperature: -7°C~+43°C
9.1.4 Indoor fan normal working amp is less than 1A,
9.1.5 Outdoor fan. Normal working amp is less than 1.5A
9.1.6 Four-way valve normal working amp is less than 1A.
9.1.7 Swing motor: DC12V.
9.1.8 Compressor: single-phase power supply. Its normal working amp is less than 15A
9.2 Proper symbols and their meanings:
TA: Indoor ambient temperature
TE: Indoor evaporator temperature
TS: Setting temperature through the remote controller
I3sec: Self-protection amp of compressor, continue three seconds until turns off the compressor.
I5MIN: Self-protection amp of compressor, continue five minutes until turns off the compressor.
IFAN: Self-protection amp of outdoor fan/indoor fans when they change from higher wind to lower
wind.
IRESTORE: Amp self-protection return value
THDEFROST: High wind, defrosting temperature difference
TMDEFROST: Middle wind, defrosting temperature difference
TLDEFROST: 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

15
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
TE9: Evaporator high temperature protection, restoring temperature
9.3 Systematic functions
Remote receiving
Testing and forced run
Position set for indoor unit wind vane
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
9.4 Protection
9.4.1 The compressor functions protection with a delay of three minutes.
9.4.2 Sensor protection at open circuit and breaking disconnection
9.4.3 Temperature Fuse break protection
9.4.4 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.
9.4.5 Cross Zero signal error warning. If there is no Cross Zero signals in 4 minutes, the unit stops
and LED displays failure information and can’t returns to normal operation automatically.
9.4.6 The current protection of the compressor
Condition Indoor fan Compressor Outdoor fan Remark
I< IRESTORE On On On
On On Off Heating modeIRESTORE <I< IFAN
Low speed On On Cooling mode
IFAN <I<I5MIN Off Off After 5 Minutes
Current up
I5MIN<I< I3SEC Off Off After 3 Seconds
I5MIN<I< I3SEC Off Off After 3 Seconds
IFAN <I<I5MIN Off Off After 5 Minutes
On On Off Heating modeIRESTORE <I< IFAN
Low speed On On Cooling mode
Current down
I< IRESTORE 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.
9.5 Fan-only mode

16
Fan speed is high/mid/low/ Auto
9.6 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 OnTemp. up
T<Ts+1 Off Off
T>Ts On OnTemp. down
T<Ts Off Off
Auto fan at cooling mode:
Condition
T=Indoor Temp.-Setting Temp.
Indoor fan speed
T<3 Low
3<T<5 Med.
Temp. up
T>5 High
T>3 High
1<T<3 Med.
Temp. down
T<1 Low
Anti-freezing control to indoor evaporator at cooling mode( T: evaporator temp. )
Condition
Temp. Time
Compressor Outdoor fan
T> TE6 On OnTemp. up
T< TE6 >5 Minutes Off Off
T> TE5 On OnTemp. down
T< TE5 >5 Minutes Off Off
9.7 Dehumidifying mode
9.7.1 The 4-way valve is off in dehumidifying mode
9.7.2 Compressor and Indoor Fan actions in dehumidifying mode
NO Conditions Indoor Fan Compressor and Outdoor Fan
1 TA ≥TS+2 LOW
BREEZE
ON 6minutes
OFF 4minutes
2 TS ≤TA＜TS+2 LOW
BREEZE
ON 5minutes
OFF 5minutes
3 TA ＜TS LOW
BREEZE
ON 4minutes
OFF 6minutes
Repeat on and off cycle.
9.7.3 Low room temperature protection:
When room temperature decreases to below 10 ℃, compressor and outdoor fan will
stop(indoor fan is Breeze). Dehumidifying operation will be resumed when room temperature
restores to over 13℃.
9.7.4 At dehumidifying mode, the anti-freezing function of the indoor heat exchanger is the same as
that of cooling mode.

17
9.7.5 At dehumidifying mode, the action of fans of indoor is the same as that of air-only mode.
9.8 Heating mode
9.8.1 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.
9.8.2 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.
9.8.3 Action of compressor and outdoor fan motor 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
9.8.4 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.
Anti-cold wind control function at heating mode
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
9.8.5 Auto wind at heating mode
Condition
T=Indoor Temp.-Setting Temp.
Indoor fan speed
T<2 HighRoom temp. up
T>2 Med.
T>0 Med.Room temp. down
T<0 High
9.8.6 Indoor evaporator high-temperature protection at heating mode
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 OffIndoor exchanger temp. down
T<TE9 On On
9.8.7 The louver opens to Standard Angle ANGLHEAT when power is on for the first time

9.9 Defrosting operation (Available for heating only).
9.9.1 Defrosting condition: Defrosting starts when either of the following ①&②:
①A 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:
℃
Temp. of evaporator---room temp.
Fan speed is high ≤THDEFROST
Fan speed is mid ≤TMDEFROST
Fan speed is low ≤TLDEFROST
Breeze Meet only if it is Breeze
②Calculate from the end of latest defrost, evaporator high temp. protection only closes outdoor
fan with the compressor still running. Add up to 90 minutes.
9.9.2 Defrosting time
If the temp. difference condition ①is satisfied for less than 40 minutes, this can be regarded
as severe frosting. The defrosting time is 10 minutes.
If the temp. difference condition ②is satisfied for more than 40 minutes, the defrosting time is
6 minutes.
If the temp. difference condition ①is satisfied out of 40 minutes, generally the defrosting time
is 6 minutes, after three continuous 6-minute defrost, the fourth should be 10 minutes defrost.
The circulation is as following:
→6-minute defrost →6-minute defrost→6-minute defrost→10-minute defrost→
9.9.3 Ending condition of defrosting
If one of following conditions is satisfied, end the defrost and turn into heating mode:
A. The defrost time has reached to 6 or 10 minutes.
B. The compressor current has reached to IDEFROST or above, IDEROST differs in different
models.
9.9.4 Defrosting Actions:
Defrost 10or 6minutes
45S 25S
Compressor
4-way Valve 23S
40S
Outdoor Fan
Indoor Fan
10S
18

19
9.10 Automatic operation mode
9.10.1 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—TS Operation mode
TA—TS>2℃Cooling
-1℃≤TA—TS≤+2℃Fan-only
TA—TS<-1℃Heating (air-only for cooling only type)
9.10.2 The indoor fan blows automatically in corresponding selected mode.
9.10.3 The motion of indoor fan’s blade should accord with the selected operation mode.
9.10.4 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.
9.11 Forced cooling function
9.11.1 Select forced cooling function with the forced cooling button or the switch.
9.11.2 The compressor is unconditionally turned on, after 30 minutes cooling operation whose fan
mode is set as low, the A/C operates at the DRY mode with a set temp. of 24℃.
9.11.3 All protections of remote control cooling are available at forced cooling operation.
9.12 Forced Auto function
Select forced auto function with the forced auto button or the switch.
In forced auto status the A/C operates at remote control mode with a set temp. of 24℃.
9.13 Timer Function
9.14 Economic Running
9.14.1 The economic running function is available at cooling, heating or auto mode.
9.14.1 Cooling:
The set temperature rise 1℃per hour. Two hours later, the set temperature will maintain as
a constant and the fan speed is kept at low speed.
9.14.2 Heating:
The set temperature decrease 1℃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 precedence over all).
9.14.3 Auto:
The economic running function operates in accordance with selected running mode by auto
mode.
9.15 Auto restart function
In case of a sudden power failure, this function automatically sets the unit to previous settings
before the power failure when power returns.