Carrier 42HQE - 38YE User manual

42HQE - 38YE
SERVICE MANUAL
42HQE022N
38YE022

Service Manual
Split Wall-Mounted Type
Room Air Conditioner
(ALLEGRO SERIES)
Model applied:
42HQE022N/38YE022

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
7
8
9
10
11
11
15
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 42HQE022N/38YE022
Power supply Ph-V-Hz 1, 220-240V~, 50Hz
Capacity Btu/h 21500
Rated Input W 2480
Rated current A 11
Cooling
EER W/W 2.54
Capacity Btu/h
25000
Rated Input W
2550
Rated current A 11.4
Heating
COP W/W
2.87
MoistureRemoval L/h 2
Max. input consumption W 3200
Max.current A 16
Startingcurrent A 63
Model PG420X3CS-4KU1
Type Rotary
Brand GMCC
Capacity Btu/h 25900
Input W 2490
Rated current(RLA) A 11.6
Thermal protector Internal
Capacitor uF 50
Compressor
Refrigerant oil ml RB68AF/T68/α68TF 950
Model YDK36-4G
Brand Welling
Input W 66/65/63 (36)
Capacitor uF 2µF/450V
Indoor fan motor
Speed(hi/mi/lo) r/min 1050/960/860
a.Number of rows 2
b.Tube pitch(a)xrow pitch(b) mm 21X13.37
c.Finspacing mm 1.3
d.Fin type (code) Hydrophilic aluminium
e.Tube outside dia.and type mm Ф7,innergroove tube
f.Coil length x height x width mm 810X357X26.74
Indoor coil
g.Number of circuits 4
Indoor fan Type mm Crossflow
Indoor air flow (Hi/Mi/Lo) m3/h 1050/950/850
Indoor Sound pressure (Hi/Mi/Lo) (LPA) @cooling dB(A) 48/45/42
Indoor Sound power (Hi/Mi/Lo) (LWA) @cooling dB(A)
Dimension (W*H*D) mm 1080X330X222
Packing (W*H*D) mm 1165X445X320
Indoor unit
Net/Gross weight Kg 17/22

5
Model YDK53-6K
Brand Welling
Input W 125
Capacitor uF 3.5
Outdoor fan motor
Speed r/min 800
a.Number of rows 2
b.Tube pitch(a)xrow pitch(b) mm 25.4x22
c.Finspacing mm 1.4
d.Fin type (code) Hydrophilic aluminium
e.Tube outside dia.and type mm Ф9.53,innergroove tube
f.Coil length x height x width mm 797X660X44
Outdoor coil
g.Number of circuits 4
Outdoor fan Type and Diameter mm Propeller
Outdoor air flow m3/h 2500
Outdoor Sound pressure (LPA) @cooling dB(A) 59
Outdoor Sound power (LWA) @cooling dB(A)
Dimension(W*H*D) mm 845X695X335
Packing (W*H*D) mm 970X770X395
Outdoor unit
Net/Gross weight Kg 62/67
Refrigerant type R407c g 2000
Designpressure MPa 2.8
Liquid side/ Gas side mm(inch) Ф9.53/Ф16.0
Max. refrigerant pipe length m 20
Refrigerant piping
Max. difference in level m 10
A
dditional refrigerant charge
over 5m g/m 65
Main mm Φ3.6*2.1*700
Expansion device (Capillary) Sub mm Φ3.6*2.1*600
Operationtemp ℃17-30
A
mbienttemp ℃—7-43
A
pplication area m2 34~49
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 42HQE022N
3.2 Outdoor unit 38YE022
12. 5
6

4. Refrigeration cycle diagram
Cooling & heating
Indoor unit outdoor unit
7
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
8
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
Model: 42HQE022N/ 38YE022
A1 A2
9

10
7. Specification of electrical parts
7.1 Temperature-resistance of indoor sensor and outdoor 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
7.2 Compressor & Fan motor windings resistance (run & start winding @20℃)
Compressor
Indoor fan motor Outdoor fan motor
Model PG420X3CS-4KU1 YDK36-4G YDK53-6K
Winding 1 (Main) 1.13±5%Ω185±8%Ω73±8%Ω
Winding 2 (Sub) 2.10±5%Ω91±8%Ω134±8%Ω

8. Troubleshooting
LED status Cause
Operation indicator, Timer indicator, Defrosting
indicator(Fan indicator, for cooling only type), Auto
indicator flicker at 5Hz
Four times current protection (PRCUR1) 5Hz
Time indicator flickers at 5Hz The room temperature sensor o is open or short
Operation indicator flickers at 5Hz The evaporator temperature sensor is open or
short
Defrosting indicator flickers at 5Hz The condenser temperature sensor is open or
short
Defrosting indicator, Auto indicator flicker at 5Hz Outdoor unit protects (Outdoor temp, sensor,
phase order etc)
Auto indicator flicker at 5Hz EEPROM Communication error
9. Electronic function
9.1 Fan only mode
Fan speed is high/mid/low/ Auto
9.2 Cooling mode
The 4-way valve is closed at cooling mode.
The action of the compressor and the outdoor fan:
T: Room temp.
Ts: Setting temp.
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
Condition(T=Indoor Temp.-Setting Temp.) Indoor fan speed
T<1 Low
1<T<4 Med.
Temp. up
T>5 High
T> 4 High
1<T<4 Med.
Temp. down
T<1 Low
Anti-freezing control to indoor evaporator
Condition
Temp. Time
Compressor Outdoor fan
T> TE6 On OnTemp. up
T< TE6 >4 Minutes Off Off
T> TE5 On OnTemp. down
T< TE5 >4 Minutes Off Off
Condenser high temp. protection( only for heat pump)
Temp. Condition Compressor
T> TE10 OffTemp. up
T< TE10 On
T> TE11 OffTemp. down
T< TE11 On
11

12
9.3 Dehumidifying mode
9.3.1 Indoor fan speed at low speed.
9.3.2 Protection is same as cooling mode.
9.4 Heating mode
9.4.1 Generally, the 4-way valve is open in heating mode, but it is closed in defrosting mode.
9.4.2 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.
9.4.3 Action conditions of compressor at heating mode: compressor must run for 4 minutes after
starting and then judge temperature. Meanwhile other protections are still valid.
Condition Compressor Outdoor fan
T> Ts+4 Off OffRoom temp. up
T<Ts+4 On On
T< Ts+3 On OnRoom temp. down
T>Ts+3 Off Off
9.4.4 Indoor Fan actions at heating mode
Indoor Fan can be set at HIGH/MID/LOW/AUTO by using a remote controller,
Anti-cold wind function 1.
Condition
T= Indoor exchanger temp.
Indoor fan speed
T<TE1 Off
TE1<T<TE2 Low speed
Indoor exchanger temp. up
T>TE2 Setting fan speed
T>TE3 Setting fan speed
TE4<T<TE3 Low speed
Indoor exchanger temp. down
T>TE4 Off
Anti- cold air protection 2 ( when the room temp. satisfy the setting temp.)
T=evaporator pipe sensor temp. Indoor fan speed
T<TE14+2 Low speed or stopRoom temp. up
T> TE14+2 Setting speed.
T> TE14 Setting speed.Room temp. down
T< TE14 Stop after 15 seconds Low speed
Auto wind
Condition
T=Indoor Temp.-Setting Temp.
Indoor fan speed
T<2 Med. speedRoom temp. up
T>2 Low speed.
T> 0 Low speed.Room temp. down
T<0 Med. speed
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 OffIndoor exchanger temp. down
T<TE9 On On
9.5 Defrosting mode
9.5.1 Conditions of defrost:
Defrosting starts when either of the following :
T3 lower than 0°c, lasts for more than 40 minutes, provided that the time period when the
temperature is lower than -3°c consecutively reaches 3 minutes.

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.
9.5.2 Conditions of defrost ending:
Defrosting ends when either of the following :
The time gets to 10 minutes;
T3>20°c
9.5.3 Time sequence of the whole defrosting procedure is as follows:
Remark: when the evaporator pipe sensor temp. more than TE16, The indoor fan start to run.
Defrost 10or 6minutes
55S 55S
Compressor
4-wayValve 50S
50S
Outdoor Fan
Indoor Fan
15S
9.6 Auto mode
9.6.1 When running in automatic mode, the air conditioner automatically selects one of the following
operation modes: cooling, heating or ventilation according to the difference between room
temp. (TA) and set temp. (TS).
TA—TS Operation mode
TA—TS>2 Cooling
-1≤TA—TS≤+2 Air-only
TA—TS<-1 Heating (air-only for cooling only type)
9.6.2 At auto mode, the indoor fan blows automatically in selected mode.
9.6.3 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 setting temp. changed
9.7 Economic mode
Cooling: The set temperature rise 1 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 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).
9.8 Manual operation
Manual operation is controlled by touching buttons and divided into force cooling
and forced auto mode. It transfers between these two modes by pressing the
buttons, the cycling order of the button press is:
9.8.1 Forced Cooling
Remote mode Forced auto Forced cooling
9.8.1.1 In forced cooling mode, the remote signal is not accepted.
9.8.1.2 The compressor is unconditionally turned on, after 30 minutes cooling operation whose fan
mode is set as low, the A/C operates in the forced auto mode under the requirements of the
forced auto mode.
9.8.1.3 During the start-up and operation, all of the following protecting functions work:
3minutes start-up delay protection, overload protection, outdoor protection, evaporator
13

14
Protection against low temperature. If any of the protection functions, the comparative
protecting action is executed.
The forced cooling mode is closed by one touch on the button, meanwhile the operation light
is off, the buzzer buzzes lasts for 1 seconds, then A/C turns to be closedown status.
9.8.2. Forced Auto
9.8.2.1 Remote control signal can be received in forced auto mode. When receiving the signals, the
forced auto mode will be canceled and the A/C changes to remote control status and performs
operation as the signals indicates.
9.8.2.2 The system performs control according to the remote control auto mode with a set
temperature of 24°c.
9.9 Timer
24 hours timer on or off.
9.10 Protecting Function
9.10.1 Compress with a delay of 3 minutes.
9.10.2 Sensor open and break protection
9.10.3 EEPROM error protection.
9.10.4 Current protection function.
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
9.11 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.
9.12 Models and Parameters
Model 42HQE022N
38YE022
I3SEC 22A
I5MIN 20A
IFAN 16A
IRESTORE 14A
TE1 25°C
TE2 32°C
TE3 30°C
TE4 20°C
TE5 2°C
TE6 12°C
TE7 63°C
TE852°C
TE948°C
TE10 65°C
TE11 55°C
TE14 32°C
TE16 42°C

15
HI-WALL split air conditioner
42HQE022N
( product. 2005)

16
HI-WALL split air conditioner
Pos. Description Part No. 022N
Front Panel 10321111046 1
Air filter 10321111001 2
Air cleaner 10321111002 1
Screw cap 10321111003 3
Panel frame 10321121004 1
Horizontal louver 10321121005 15
Louvers holder 10321121006 3
Stopper 10321121007 1
Big bush 10321121008 2
Small bush 10321121009 4
A ir outlet frame 10321121010 1
Drain hose 10118121223 1
Left holder for evaporator 10321111004 1
Evaporator assembly 10924121003 1
Bearing holder 10321111008 1
Cross flow fan, assy 10321111009 1
Chassis 10321111010 1
Installation Plate 10321111011 1
Fan motor 10321111012 1
Fan motor cover 10321111013 1
Clip temperature sensor 10321111036 1
Right holder for evaporator 10321111014 1
Indoor temp sensor 10118121241 1
Connecting pipe clamp 10321111015 1
Evaporator temp sensor 10109121242 1
Louver motor 10105111047 2
Horizontal louver down 10321111048 1
Horizontal louver up 10321111049 1
Cover for repairing 10318121011 1
E-part box cover 10321111018 1
Terminal block, sensor 10321121001 1
Terminal block, indoor-outdoor 10121121227 1
Terminal block, power supply 10121121233 1
Fan motor capacitor 13810144074 1
Transformer 10118121232 1
E-Parts Box 10318121012 1
Main control board 10321111037 1
Wire clamp for power cord 10121121234 1
LED board 10321111021 1
LED board enclosure 10321111022 1
Electric control assembly 10321121014 1
Remote Controller 10109121207 1
Holder, Remote Controller 10109121208 1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
21
22
23
24
25
26
27
28
29
31
32
33
34
35
36
37
38
39
40
41
42
43
Models
42HQE Notes
42HQE022N
( product. 2005)

17
Outdoor unit
38YE022
( product. 2005)

18
Outdoor unit
Pos. Description Part No. 022
Clamp for front net 10112121801 8
Front net 10118121801 1
Front clapboard 10118121802 1
Front cabinet, right 10118121803 1
Propeller fan 10118121804 1
Fan Motor 10121121801 1
Chassis 10122113803 1
Foam, motor holder 10118121807 1
Cover 10118121808 1
Holder for fan motor 10118121809 1
Condenser coil 10424121801 1
Underlay for rear net 10118121818 4
Rear net 10118121814 1
Small Handle 10109121802 1
Left clapboard 10118121815 1
Right clapboard 10118113804 1
Big Handle 10118121817 1
Installation plate for valves 10118113805 1
Water collector 10118121832 1
Condenser temp sensor 10121121816 1
Capacitor clamp 10112121814 1
Compressor capacitor 10118121820 1
Fan motor capacitor 10124121806 1
Wire joint 10124121810 1
Washer for wire joint 10112121817 1
Wire clamp for wiring 10118121823 1
Installation board for E-parts 10118113811 1
Separating board 10121121803 1
Contactor 10121121806 1
Wire joint for multiplexer 10121121809 1
Liquid pipe valve 10424121803 1
Four-Way Valve assy 10321111038 1
Gas pipe valve 10424121804 1
Compressor 10424121805 1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
Models
38YE Notes
38YE022
( product. 2005)

Via R. Sanzio, 9 - 20058 Villasanta (MI) Italy - Tel. [phone]
The manufacturer reserves the right to change any product specifications without notice.