Mitsubishi Electric QUHZ-W40VA User manual

SERVICE MANUAL
AIR TO WATER HEAT PUMP
R744
Outdoor Unit
[Model Name]
QUHZ-W40VA
Outdoor Unit
No.GHH15010
CONTENTS
1. SAFETY PRECAUTION................................... 2
2. SPECIFICATIONS............................................ 3
3. DATA
............................................................. 4
4. OUTLINES AND DIMENSIONS..................... 6
5. WIRING DIAGRAM........................................ 7
6. REFRIGERANT SYSTEM DIAGRAM ............... 8
7. TROUBLESHOOTING ................................... 9
8. DISASSEMBLY PROCEDURE...................... 24
PARTS CATALOG (GHB15010)
Notes:
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GHH15010 2
SAFETY PRECAUTION
1
1-1. ALWAYS OBSERVE FOR SAFETY
Before obtaining access to terminal, all supply circuits must be disconnected.
Preparation before the repair service.
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Precautions during the repair service.
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GHH15010 3
SPECIFICATIONS
2
2-1. SPECIFICATIONS
1ø,230V,50HzPower supply (Phase,Voltage,Frequency)
Nominal water flow rate(Heating mode) 5.7
4kW
kW
kW
kW
kW
kW
m3/min
kW
L/min
L/min
L/min
L
CapacityHeating
$:ǻ 4.65
0.86
COP
Capacity
COP
Power input
kW
Power input
Capacity
COP
Power input
4Heating
$:ǻ 3.2
1.25
1.35
1.4Nominal water flow rate(DHW mode)
5DHW
$:ǻ 3.7
Outdoor unit specifications
Service ref. QUHZ-W40VA
4.7AHeating(A7/W35)
Heating(A7/W35)
Running current
6.8
1.3
0.050
34
1,200
ADHW(A7/W65)
DHW(A7/W65)
80
85
䠂
䠂
Power factor
12AMax.current
Galvanized plateOuter casing
Munsell 2.5Y 7/1External finish
Liner expansion valveRefrigerant control
Hermetic single rotalyCompressor
KXB045FJKModel
Motor output
Inverter
0.47 (PAG)
Start type
Protection devices HP switch
Discharge thermo
Oil(Model)
Plate fin coilAirHeat exchanger
Twisted & spiral Gas coolerWater
Propeller fan ×1Fan(drive)×No.Fan
Fan motor output
Air flow
(CFM)
dB
Hot gas
43/53
300+20 (11‐13/16+13/16)
Defrost method
Noise level(SPL/PWL) Heating(A7/W55)
809+70 (31‐7/8+2‐3/4)mm(in)
mm(in)
mm(in)
iWidthDimensions
Depth
Height
57 (125.7)
1.15 (2.54)
-15 to +35
-15 to +35
+9 to +55
+9 to +55
715 (28‐1/8)
kg(lb)
kg(lb)
Weight
R744Refrigerant
Quantity
Heating
Guaranteed operating range (Outdoor)
DHW
Heating
DHW
Heating
DHW
+7℃
+6℃
+25/+35℃
+2℃
+1℃
+25/+35℃
+7℃
+6℃
+15/+65℃
+60䉝
䉝
䉝
䉝
䉝
Outlet water temp.
（Max) +72䉝
Nominal return water temperature range
3 to 8Water flow rate range (Heating)
Nominal operating condition
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+HDWLQJ$:ǻ
Outside air temperature(Dry-bulb)
Outside air temperature(Wet-bulb)
Water temperature(inlet/outlet)
Outside air temperature(Dry-bulb)
Outside air temperature(Wet-bulb)
Water temperature(inlet/outlet)
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Outside air temperature(Dry-bulb)
Outside air temperature(Wet-bulb)
Water temperature(inlet/outlet)

GHH15010 4
DATA
3
1m
MICROPHONE UNIT
GROUND
3-1. NOISE CRITERION CURVES
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 bar)
BAND CENTER FREQUENCIES, Hz
NOTCH
HEATING
A7/W55
43
SPL(dB) LINE
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
10
20
30
40
50
60
70
80
90
63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
［dB］
125 250 500 1000 2000 4000 8000 OA 63
QUHZ-W40VA 4345.3 46.4 40.9 35.6 33.0 25.5 21.446.4
BAND CENTER FREQUENCIES, Hz
FORMNAME

GHH15010 5
3-2. STANDARD OPERATION DATA
Mode
TotalElectrical circuit
Refrigerant circuit
Water conditions
Outdoor conditions
Capacity
Input
Outdoor unit
Phase, Hz
Voltage
Current
Discharge pressure
Discharge temperature
Flow volume
Outlet water temperature
Intake air temperature
kW
kW
V
A
MPa
ºC
L/min
ºC
D.B. ºC
W.B. ºC
DHW
(A7/W35)
Heating
(A7/W65)
4.00 5.00
0.86 1.35
QUHZ-W40VA
1, 50Hz
230 230
4.7 6.8
7.4 9.7
70 100
5.7 1.4
35 65
77
66
The unit of pressure has been changed to MPa based on international SI system.
The conversion factor is: 1 (MPa) = 10.2 (kgf/cm2)

GHH15010 6
QUHZ-W40VA
OUTLINES AND DIMENSIONS
4
Unit: mm
Bolt pitch
for installation
303
8
406
715
21 70809
155 500
Service panel
Valve cover
Pipe connection B (G1/2)
Pipe connection A (G1/2)
207
184
172
20
127 (80)
Air out
Bolt pitch for installation
2 elongate holes (10X21)
2 notch holes of U-shaped
Air in
Air in
319~330
300
40
360

GHH15010 7
5 WIRING DIAGRAM
QUHZ-W40VA

GHH15010 8
REFRIGERANT SYSTEM DIAGRAM6
Symbol
MC
HPS
MUFF
GC
SLHX
ST
LEV
CT
EVA
TH1
TH2
TH3
TH4
MF
FAN
Part name
Compressor
High pressure switch
Muffler
Gascooler
Suction line heat exchanger
Strainer
Linear expansion valve
Capillary tube
Evaporator
Discharge temperature thermistor
Defrost thermistor
Ambient temperature thermistor
Hot water temperature thermistor
Fan motor
Propeller Fan
Detail
DC inverter single rotary compressor(Mitsubishi Electric Corporation)
For protection(OFF:15MPa)
For noise reduction
Heat exchanger (2pass)
#100
For LEV Control and compressor protection
For defrost control
For fan control and for compressor frequency control
For DHW pump control
FAN
TH2
MF
EVA
TH3 CT
LEV
ST
SLHX
MC
TH1 MUFF
HPS
TH4
Water OUT
Water IN
GC

GHH15010 9
TROUBLESHOOTING7
7-1. TROUBLESHOOTING
7-2. CHECK POINT UNDER TEST RUN
Unit conditions
at service Check code Actions to be taken for service (summary)
The trouble is
reoccurring. Displayed
Not displayed
The trouble is not
reoccurring. Logged
Not logged
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control screen of the cylinder unit.
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is operating.
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the corresponding actions to be taken for service (summary).
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polarities) and defective contacts.
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outdoor control board.
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perform the required action.
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perform the required action.
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symptoms again. Check the installation environ-
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the problem occurred.
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and perform the required action.
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(4) No abnormality in electric parts and control
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(1) Check for abnormal symptoms again.
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the problem.
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(4) No abnormality in electric parts and control
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GHH15010 10
7-3. SELF-DIAGNOSIS ACTION TABLE
Abnormal point and
detection method
CaseCheck Code
Check LED
LED2
RED
Out
Outdoor unit emergency stop
Out
3
times Lit
2
times Out
4
times Out
6
times Out
LED1
GREEN
Judgment and action
E6
or
None
*< Caution >
Pay attention to electric shock
since the condensers
[C61/C62/C63/C65] are
sometimes high voltage (300 V
or more).
*The LEDs (red, green) light
when the condenser is normal.
(1) Power is not being supplied to
the outdoor unit
a) Earth leakage circuit breaker
of the cylinder unit is turned off
b) Defective power line not
connected or terminal contact
c) Power transmission line not
connected or defective terminal
contact
(2) Power is not being supplied to
the outdoor inverter p.c. board
a) Loose terminal block (TB)
power terminal [S1/S2/S3]
b) Loose reactor (L61) terminal
c) Loose relay (X64) terminal
(3) Defective outdoor inverter p.c.
board
(1) Check the following items
a) Earth leakage circuit breaker
b) Power line connections
c) Power transmission line
connections
(2) Check the following items
a) Terminal block (TB) power
terminal [S1/S2/S3] connections
b) Reactor (L61) connections
c) Relay (X64) connections
(3) Replace the outdoor inverter
p.c. board
(1) Environment is outside the
possible operating temperature
of the outdoor unit
(2) Defective THERMO_ASSY
AMB (TH3)
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THERMO_ASSY AMB (TH3)
detects 50°C or higher
Excessive ambient temperature (1) Improve the installation
environment
(2) Replace the THERMO_ASSY
AMB (TH3)
(1) Defective board temperature
thermistor on outdoor inverter
p.c. board
(2) Defective microcomputer on
outdoor inverter p.c. board
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or short circuit detected
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continued for 1 second from 1
minute onwards after start of
compressor operation
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continued for 1 second at all
times
Ɣ&RQQHFWRU1RQH%RDUG
mounting
Disconnection of Outdoor inverter
p.c. board temp. thermistor
(1)(2) Replace outdoor inverter
p.c. board
(1) Defective outdoor inverter p.c.
board
Primary current abnormality
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primary current sensor detected
for 1 second
(1) Replace the outdoor inverter
p.c. board
(1) Defective outdoor inverter p.c.
board
(2) Overcurrent due to LEV
malfunction
a) Loose LEV coil
b) Loose connector [CN724]
c) LEV coil disconnection
d) LEV unit malfunction
(3) Compressor malfunction
(locked，out-of-phase, phase
interruption)
(4) Power waveform distortion,
noise
Overcurrent abnormality
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detected by secondary current
(1) Replace outdoor inverter p.c.
board
(2) Check the LEV coil.
(See "9-4. HOW TO CHECK THE
PARTS.")
a) Install the LEV coil
b) Connect the connector
c) Replace the LEV coil
d) Replace the outdoor unit
(3) Replace the outdoor unit
(4) Check to see if the power
waveform is normal