Mitsubishi Electric QUHZ-W40VA, Руководство по обслуживанию

Страница: 13 / 34

GHH15010
13
Abnormal point and
detection method
Case Check Code
Check LED
LED2
RED
LED1
GREEN
Judgment and action
1
times
Lit
6
times
Lit
8
times
8
times
U2
U3
(1) Water is not being circulated
in the outdoor unit water circuit
a) Cylinder unit not filled with
water
b) Air trapped in water pipes
c) Water leakage, crushing or
blockage of water pipes
d) Isolating valve in water pipes
closed
e) Pump valve in cylinder unit
closed
f) Water pipe freezing
g) Outdoor unit gas cooler
blockage
(2) Pump1 in the cylinder unit not
operating
a) Defective pump1
b) Defective cylinder unit board
(3) Erroneous detection caused
by defective discharge
temperature thermistor (TH1)
(4) Defective LEV coil
a) Loose LEV coil
b) Loose connector (CN724)
c) LEV coil disconnection
(5) Defective coolant circuit part
a) Defective LEV
b) Insufficient coolant caused by
coolant leakage
Overheat discharge temperature
Ɣ'HWHFWLRQPHWKRG
THERMO_ASSY DIS detects
130°C or higher
(1) Check the water circuit, and
correct any abnormal locations
a) Fill with water
b) Bleed air
c) Correct or replace the water
piping
d) Repair the isolating valve
e) Repair the pump valve
f) Melt frozen sections
g) Replace the outdoor unit
(2) Check pump1 in the cylinder
unit.
a) Replace pump1
b) Replace cylinder unit board
(3) Measure the resistance value
of the discharge temperature
thermistor (TH1).
(See "9-4. HOW TO CHECK THE
PARTS.")
Replace the discharge tempera-
ture thermistor (TH1)
(4) Check LEV coil.
(See "9-4. HOW TO CHECK THE
PARTS.")
a) Install LEV coil
b) Connect connector (CN724)
c) Replace LEV coil
(5) Replace outdoor unit
(1) Refrigerant leakage on
refrigerant circuit
a) Evaporator breakage
b) Evaporator corrosion
c) Refrigerant piping damage
d) Refrigerant piping corrosion
e) Gas cooler damage
f) Gas cooler corrosion
(2) Defective compressor
compression
Refrigerant zero abnormality
Ɣ'HWHFWLRQPHWKRG'HWHFWHGE\
secondary current value at
startup operation
(1)-(2) Replace outdoor unit
(1) Defective connector (CN641)
connection
(2) Defective (TH1)
a) Thermistor (TH1) disconnec-
tion
b) Thermistor (TH1) short circuit
(3) Defective outdoor inverter p.c.
board
Short circuit or disconnection of
discharge temp.thermistor (TH1)
Ɣ'HWHFWLRQPHWKRG'LVFRQQHF
-
tion or short circuit detected
Ɣ'LVFRQQHFWLRQ
°C or less
continued for 2 minutes 10
minutes onwards after start of
compressor operation
Ɣ6KRUWFLUFXLW
°C or less
continued for 2 minutes at all
times
Ɣ&RQQHFWRU&1
(1) Connect connector (CN641)
(2) Check the resistance value
and temperature of the
thermistor (TH1).
(See "9-4. HOW TO CHECK THE
PARTS.")
a) Replace thermistor (TH1)
b) Replace thermistor (TH1)
(3) Replace the outdoor inverter
p.c. board