168
3.17 Refrigerant recovery control during maintenance
(1) When the outdoor unit is discarded and transferred, the refrigerant needs to be recovered from the outdoor unit.
At this time, the outdoorl unit performs the refrigerant recovery operation. (The refrigerant in the system is recycled
to the outdoor unit)
(2) This control operation by hand
(3) Operation step:
①
Turn on the unit for cooling operation
②
Close the liquid pipe stop valve of each outdoor unit
③
After the low pressure of each outdoor unit is lower than 0.1 MPa for 10 seconds, closed the gas pipe stop valve
of each outdoor unit at the same time.
④
The units are powered off and the refrigerant recovery is ended
3.18 Broken sensor detection and required temperature range
(1) The sensor's style range and breakage detection value
(2) Disconnection detection method
①
Detecting the AD value of temp. sensor less than 11 (open circuit) or more than 1012 (short-circuit) continuously
for 60 seconds, the failure be confirmed and unit alarm.
②
Toil1, Toil2, Td1, Td2, T
o
ilp, and Tsuc sensor, do not judge the disconnection fault when the outdoor temperature
is lower than 0°C.
③
The high-pressure and low-pressure sensors detect AD values less than 11 (open circuit) or more than 1012
(short-circuit) continuously for 30 seconds, alarm. During defrosting and after defrosting 3 minutes, do not alarm.
No.
Sensor
Unit
Application range
Disconnection range
1
Tfin
℃
-10~140
-11
℃
below
2
Toil1
,
Toil2
,
Td1
,
Td2
℃
-20~140
-30
℃
below
3
Ts
,
Ts1
,
Ts2
,
Tsco
℃
-40~75
-50
℃
below
4
Tao
℃
-40~75
-50
℃
below
5
Tdef1
,
Tdef2
,
Toci1
,
Toci2
,
Tliqsc
℃
-40~75
-50
℃
below
6
Toilp
,
Tsuc
℃
-20~140
-30
℃
below
7
High pressure
MPa
0~4.15MPa
0V below or 3.49V
above
8
Low pressure
MPa
0~1.7MPa
Summary of Contents for MRV 5-RC VP1-112B
Page 1: ...MRV 5 RC Service Manual SYJS 03 2019REV A Edition 2019 03 ...
Page 3: ......
Page 55: ...52 AV08 10 12 14IMVURA 4 Center of gravity x X 347 9587 y 471 5454 z 725 6683 y z ...
Page 56: ...53 AV16 18 20 22IMVURA x X 650 5962 y 380 7255 z 706 5342 y z ...
Page 106: ...103 2 Dimension 4 19 200 60 25 25 25 249 108 232 84 69 388 73 82 65 103 177 4 44 4 35 277 ...
Page 116: ...113 2 Preparation before installation ...
Page 162: ...159 One by one valve box PCB code 0151800186A 2 Valve box PCB photo and dip switch setting ...
Page 165: ...162 One by four valve box PCB code 0151800466 ...