Mitsubishi Heavy Industries MHI FDU71VNXVF1 Technical Manual page 82

Error indicated on the
remote control unit
●
If an error code other than those listed above is indicated, refer to the wiring diagram of the outdoor unit and the indoor unit.
5) The state of the electronic expansion valve.
The following table illustrates the steady states of the electronic expansion valve.
Valve for a cooling operation
Valve for a heating operation
6) Heed the following on the first operation after turning on the circuit breaker.
Pipe cover (accessory)
This outdoor unit may start in the standby mode (waiting for a compressor startup), which can continue up to 30 minutes, to prevent the oil
level in the compressor from lowering on the first operation after turning on the circuit breaker. If that is the case, do not suspect a unit failure.
6. UTILIZATION OF EXISTING PIPING.
Exterior tape
Check whether an existing pipe system is reusable or not by using the following flow chart.
Gas piping
insulation
Earth leakage breaker
(Harmonic resistant type)
WARNING
Switchgear or Circuit breaker
L1 L2 L3 N
Outdoor unit
1 2/N 3
1 2/N 3
Indoor unit
X Y
X Y
Remote controller
Model 100VS ~ 140VS
100VSX ~ 140VSX
Printed circuit board LED(The cycles of 5 seconds)
Failure event
Red LED Green LED
E34 Blinking once Blinking continuously Open phase
63H1 actuation or operation with operation valves shut
E40 Blinking once Blinking continuously
(occurs mainly during a heating operation)
Low pressure error or operation with operation valves shut
E49 Blinking once Blinking continuously
(occurs mainly during a cooling operation)
When the unit comes to a normal stop
When power is turned on
During a cooling operation During a heating operation
Complete shut position Complete shut position Full open position
Full open position Full open position Complete shut position
START
Are an outdoor unit and an indoor unit connected to the NO
existing pipe system to reuse?
YES
Which of the following refrigeration oils
NO
Are the existing units our products? does the existing unit use?
Suniso, MS, Barrel Freeze, HAB, Freol,
YES YES
ether oil, ester oil
Does the existing pipe system to reuse satisfy all of the following?
(1) The pipe length is 50m or less.
(2) The pipe size conforms to the table of pipe size restrictions.
(3) The elevation difference between the indoor and outdoor units
NO
conforms to the following restrictions.
Where the outdoor unit is above: 30m or less
※Check with the flow chart developed for a case where
Where the outdoor unit is below: 15m or less
an existing pipe system is reused for a
YES
twin-triple-double-twin model published as a
technical data sheet.
YES
Is the unit to install in the existing pipe system a
Change the branching pipe to a specified type.
twin-triple-double-twin model?
Change
NO
YES
Repair the damaged parts.
Is the existing pipe system to reuse free of corrosion, flaws or dents?
Repair
NO
Is the existing pipe system to reuse free of gas leaks?
(Check whether refrigerant charge was required frequently for Check the pipe system for air tightness on the site.
the system before)
Air tightness is OK
NO
Are there any branch pipes with no indoor unit connected? Remove those branches.
NO Remove
Are heat insulation materials of the existing pipe system to
Repair the damaged parts.
reuse free of peel-offs or deterioration?
(Heat insulation is necessary for both gas and liquid pipes)
Repair
NO
Aren't there any loose pipe supports? Repair the damaged parts.
Some loose pipe supports
No loose pipe supports Repair
The existing pipe system is not reusable.
The existing pipe system is reusable.
Install a new pipe system.
<Where the existing unit can be run for a cooling operation.>
Carry out the following steps with the excising unit (in the order of (1), (2), (3) and (4))
(1) Run the unit for 30 minutes for a cooling operation.
(2) Stop the indoor fan and run the unit for 3 minutes for a cooling operation (returning liquid)
(3) Close the liquid side operation valve of the outdoor unit and pump down (refrigerant recovery)
(4) Blow with nitrogen gas. ※ If discolored refrigeration oil or any foreign matters is discharged by the blow,
wash the pipe system or install a new pipe system.
●
For the flare nut, do not use the old one, but use the one supplied with the outdoor unit.
Process a flare to the dimensions specified for R410A.
Turn on-site setting switch SW5-1 to the ON position. (Where the gas pipe size is φ 19.05)
●
<Where the existing unit cannot be run for a cooling operation.>
Wash the pipe system or install a new pipe system.
●
If you choose to wash the pipe system, contact our distributor in the area.
⑧
Make sure that a red LED is not blinking.
⑨
Action
When you complete the test run, do not forget to turn SW3-3 to the OFF position.
⑩
Where options are used, check their operation according to the respective instruction manuals.
Check power cables for loose contact or disconnection
1. Check whether the operation valves are open.
2. If an error has been canceled when 3 minutes have elapsed
since a compressor stop, you can restart the unit by
effecting Check Reset from the remote control unit.
SWITCHES FOR ON-SITE SETTING
When the unit comes to an abnormal stop
During a cooling operation During a heating operation
Full open position Full open position
Full open position Full open position
<Table of pipe size restrictions>
◎:Standard pipe size ○:Usable
△:Restricted to shorter pipe length limits ×:Not usable
Additional charging amount of refrigerant per 1m
Liquid pipe
Pipe size
Gas pipe
Can't
NO Make an inquiry Use Usability
for reusability. 100VN
Maximum one-way pipe length
100VS
Can Use Length covered without additional charge
Usability
125VN
Maximum one-way pipe length
125VS
Length covered without additional charge
Usability
140VN
Maximum one-way pipe length
140VS
Length covered without additional charge
<Pipe system after the branching pipe>
Change is impossible.
Additional charging amount of refrigerant per 1m
Liquid pipe
Repair is impossible.
Pipe size
Gas pipe
Model Combination type Combination of capacity
100V Twin
Air tightness is
impossible. 125V Twin
Twin
140V Triple A
Remove is Triple B
impossible
※1 Because of its insufficient pressure resistance, turn the dip switch SW5-1 provided on the outdoor unit board to the ON position for φ19.05 × t1.0.
(In the case of a twin-triple-double-twin model, this also applies to the case where φ19.05× t1.0 is used in a pipe system after the first branching point.)
However, you need not turn the dip switch SW5-1 to the ON position, if 1/2H pipes or pipes having 1.2 or thicker walls are used.
Repair is impossible. ※2 When the main pipe length exceeds 40m, a significant capacity drop may be experienced due to pressure loss in the liquid pipe system. Use φ12.7 for the
liquid main.
※3 Keep the total pipe length, not one-way pipe length, below the specified maximum pipe length.
※4 Piping size after branch should be equal or smaller than main pipe size.
※5 Piping size from first branch to indoor unit should be φ9.52 (Liquid) /φ12.7 (Gas).
● When refrigerant piping is shoter than 3m, reduce refrigerant by 1kg from factory charged volume.
Any combinations of pipe sizes not listed in the table or marked with × in the table are not usable.
●
<The model types of existing units of which branching pipes are reusable.>
Models later than Type 8.
F D C ＊ ＊ ＊ 8 □ □ □
●
F D C P ＊ ＊ ＊ 8 □ □ □
●
The branching pipes used with models other than those listed above are not reusable because of their insufficient
pressure resistance. Please use our genuine branching pipes for R410A.
＊ ＊ ＊ are numbers representing horsepower. □ □ □ is an alphanumeric letter.
●
Formula to calculate additional charge volume
Additional charge volume (kg) = {Main pipe length (m) – Length covered without additional charge shown in the table (m)} ×
Total length of branch pipes (m)× Additional charge volume per meter of pipe shown in the table (kg/m)
※ If you obtain a negative figure as a result of calculation, no additional refrigerant needs to be charged.
Example) When an 140V (single installation) is installed in a 20m long existing pipe system (liquid φ12.7, gas φ19.05),
the quantity of refrigerant to charge additionally should be (20m-15m) x 0.08kg/m = 0.4 kg.
SWITCHES FOR ON-SITE SETTING
SW5
ON
ON
1 2
1 2 3 4
All set to OFF for shipment All set to OFF for shipment
0.06kg/m 0.08kg/m Additional charging amount of refrigerant per 1m 0.02kg/m
φ 9.52 φ 9.52 φ 12.7 φ 12.7 φ 6.35 φ 9.52
Liquid pipe
Pipe size
φ 15.88 φ 19.05 φ 15.88 φ 19.05 φ 15.88 φ 15.88
Gas pipe
◎ ○※1 △ △※1 △
Usability
100VNX
50 50 25 25 Maximum one-way pipe length 20
100VSX
30 30 15 15 Length covered without additional charge 10
◎ ○※1 △ △※1 △
Usability
125VNX
50 50 25 25 Maximum one-way pipe length 20
125VSX
30 30 15 15 Length covered without additional charge 10
◎ ○※1 △ △※1 △
Usability
140VNX
50 50 25 25 Maximum one-way pipe length 20
140VSX
30 30 15 15 Length covered without additional charge 10
After 1st branch ※4 After 2nd branch
0.06kg/m 0.06kg/m
φ 9.52 φ 9.52
φ 12.7 φ 15.88 φ 19.05 ※1 φ 12.7 φ 15.88 φ 19.05※1
◎ ○ × ー ー ー
50+50
◎ ○ × ー ー ー
60+60
× ◎ ○ ー ー ー
71+71
◎ ○ × ー ー ー
50+50+50
× ◎ ※5 ○ ※5 ◎ ○ ×
50+50+50
Additional charge volume per meter of pipe shown in the table (kg/m) ＋
SW3
3 4
0.06kg/m 0.08kg/m
φ 9.52 φ 12.7 φ 12.7
φ 19.05 φ 15.88 φ 19.05
◎ ○※1 △ △※1
100 100 50 50
30 30 15 15
◎ ○※1 △ △※1
100 100 50 50
30 30 15 15
◎ ○※1 △ △※1
100 100 50 50
30 30 15 15