Mitsubishi Heavy Industries MHI FDU71VNXVF1 Technical Manual page 242

As indicated in the table shown on the right, pressure detected at each point will vary
, R407C, etc.).
depending on whether a cooling or heating operation has been selected.
m pump oil from
3) Setting SW3-1, SW3-2, on-site
(1) Defrost control switching (SW3-1)
・ When this switch is turned ON, the unit will run in the defrost mode more frequently.
・ Set this switch to ON, when installed in a region where outdoor temperature falls below zero during the season the unit is run for a
me Installation's pipe length (m)
ment covered without additional
(2) Snow guard fan control (SW3-2)
refrigerant charge
・ When this switch is turned on, the outdoor unit fan will run for 10 seconds in every 10 minutes, when outdoor temperature falls to 3℃ or
・ When the unit is used in a very snowy country, set this switch to ON.
30
4) Failure diagnosis in a test run
Error indicated on the
remote control unit
negative,
●
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.
charge refrigerant from the gas
is throttled down or a dedicated
Valve for a cooling operation
Valve for a heating operation
6) Heed the following on the first operation after turning on the circuit breaker.
cessory)
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.
g indoor
Exterior tape
Check whether an existing pipe system is reusable or not by using the following flow chart.
Gas piping
ng
insulation
f an outdoor unit to discharge
, install the unit on a flat base
ocks.
close the other two drain holes
It dose not improve power factor,
ther outside the unit. Laying them
component box are free of loose
cover attachment can result in
e.
terminal connections.
Earth leakage breaker
(Harmonic resistant type)
WARNING
witchgear or Circuit breaker
L1 L2 L3 N
Outdoor unit
1 2/N 3
1 2/N 3
Indoor unit
X Y Z
X Y Z
Remote control
Model 100VS ~ 140VS
heating operation.
lower and the compressor is not running.
Printed circuit board LED(The cycles of 5 seconds)
Failure event
Red LED Green LED
E34 Blinking once Open phase
Blinking continuously
63H1 actuation or operation with operation valves shut
Blinking once
E40 Blinking continuously
(occurs mainly during a heating operation)
Low pressure error or operation with operation valves shut
Blinking once
E49 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 Complete shut position
Full open 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.
Suction pressure Discharge pressure
Heating
(Low pressure) (High pressure)
operation
Action
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.
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 Full open position
<Table of pipe size restrictions>
◎:Standard pipe size ○:Usable
△:Restricted to shorter pipe length limits
Additional charging amount of refrigerant per 1m
Liquid pipe
Pipe size
Gas pipe
Can't
NO Make an inquiry Use Usability
for reusability.
100V Maximum one-way pipe length
Length covered without additional charge
Can Use
Usability
125V Maximum one-way pipe length
Length covered without additional charge
Usability
140V Maximum one-way pipe length
Length covered without additional charge
Change is impossible.
<Pipe system after the branching pipe>
Repair is impossible.
◎:Standard pipe size ○:Usable ×:Not usable
●
Air tightness is Any combinations of pipe sizes not listed in the table or
impossible.
marked with × in the table are not usable.
Remove is Additional charging amount of refrigerant per 1m
impossible
Pipe size
Model Combination type
100V
Repair is impossible.
125V
140V Triple A
Triple B
※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).
<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)} ×
※ 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.
Is indoor unit installation work completed?
ー
Indoor unit
Where a face cover should be attached onto an indoor unit, is the face cover attached to the indoor unit?
Always carry out a test run and check the following in order as listed.
Test run procedure ●
Turn The contents of operation
①
Open the gas side operation valve fully.
②
Open the liquid side operation valve fully.
③
Close the panel.
④
Where a remote control unit is used for unit setup on the installation site, follow instructions for unit setup on the installation site with a remote control unit.
SW3-3 ON / SW3-4 OFF: the unit will start a cooling operation.
⑤
SW3-3 ON / SW3-4 ON: the unit will start a heating operation.
⑥
When the unit starts operation, press the wind direction button provided on the remote control unit to check its operation.
⑦
Place your hand before the indoor unit's diffuser to check whether cold (warm) winds come out in a cooling (heating) operation.
⑧
Make sure that a red LED is not blinking.
⑨
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.
SWITCHES FOR ON-SITE SETTING
SW5
ON
1 2 3 4
All set to OFF for shipment
※1 Because of its insufficient pressure resistance, turn the dip
0.06kg/m 0.08kg/m
switch SW5-1 provided on the outdoor unit board to the
φ 9.52 φ 9.52 φ 12.7 φ 12.7
ON position for φ19.05 × t1.0.
φ 15.88 φ 19.05 φ 15.88 φ 19.05
(In the case of a twin-triple-double-twin model, this also applies
◎ ○※1 △ △※1 to the case where φ19.05 × t1.0 is used in a pipe system
after the first branching point.
50 50 25 25
However, you need not turn the dip switch SW5-1 to the ON
30 30 15 15
position, if 1/2H pipes or pipes having 1.2 or thicker walls
◎ ○※1 △ △※1
are used.
50 50 25 25
※2 When the main pipe length exceeds 40m, a significant
30 30 15 15
capacity drop may be experienced due to pressure loss in the
◎ ○※1 △ △※1 liquid pipe system. Use φ12.7 for the liquid main.
※3 Keep the total pipe length, not one-way pipe length, below the
50 50 25 25
specified maximum pipe length.
30 30 15 15
●
When refrigerant piping is shoter than 3m, reduce refrigerant by
1kg from factory charged volume and adjust to 2.8kg.
●
Any combinations of pipe sizes not listed in the table or marked
with × in the table are not usable.
After 1st branch ※4 After 2nd branch
0.06kg/m 0.06kg/m
φ 9.52 φ 9.52
Liquid pipe
φ 12.7 φ 15.88 φ 19.05 ※1 φ 12.7 φ 15.88
Gas pipe
Combination of capacity
◎ ○ × ー ー
Twin 50+50
◎ ○ × ー ー
Twin 60+60
× ◎ ○ ー ー
Twin 71+71
◎ ○ × ー ー
50+50+50
× ◎ ※5 ○ ※5 ◎ ○
50+50+50
Additional charge volume per meter of pipe shown in the table (kg/m) ＋
Total length of branch pipes (m)× Additional charge volume per meter of pipe shown in the table (kg/m)
Check
SWITCHES FOR ON-SITE SETTING
SW3
ON
1 2 3 4
All set to OFF for shipment
φ 19.05※1
ー
ー
ー
ー
×