Part - Haier MRV II Instruction Manual

data analysis
No. problem
one EEV
can not be
1
closed fully
sensors of
two indoors
2
are inserted
conversely
resistance of
gas pipe
sensor on
3
two indoors
is wrong
5 indoors do
4
not cool
current of
No.1 slave
5
unit is
abnormal
open angle of EEV on stop indoor shows 4 (close
fully), normally the coil temp. should close to indoor
ambient temp. ( TA±3 ); this indoor two coil temp. is
much lower than ambient temp., that is EEV does
not closed fully and cause liquid return----to find the
reason
1.in cooling operation, the min. open angle of indoor
EEV is 90 and the max. is 480
2.if the sensor is inserted conversely, the EEV will
close to min or open max.
3.if EEV close to min, the flow volume is min too,
temp of TC2 is low (much lower than TC1), TC1 is
close to ambient temp; when EEV open max. the
flow volume is too big, TC1 is low and TC2 is
high----liquid return, please confirm if the two
sensors are inserted properly
1. one unit does not startup, EEV open angle
shows 4, coil temp. should be close to
ambient temp., but TC1 shows 46, that
should be wrong sensor resistance
2.start one unit, EEV shows 480, but TC1 still is too
high, that should be wrong sensor resistance
confirm if the EEV can be open: break power supply
and resume to listen to the EEV action voice, or turn
off the indoor for 1 minute and turn it on to check if
there is cooling air flow out, if yes the EEV is
normal, if the EEV does not open please open to
check
check if the sensor is inserted conversely
If all of above are normal, adjust the indoor EEV
open angle to 90 in cooling mode
position of solenoid SV4,SV5 is wrong
80
81
diagnose

Part 2