Mitsubishi Heavy Industries FDTC40ZIXVD Data Book page 213

5. UTILIZATION OF EXISTING PIPING
Check whether an existing pipe system is reusable or not by using the following flow chart.
Are an outdoor unit and an indoor unit connected to the
existing pipe system to reuse?
Are the existing units our products?
Does the existing pipe system to reuse satisfy all of the following?
(1) The pipe length is 30m or less.
(2) The pipe size conforms to the table of pipe size restrictions.
(3) The elevation difference between the indoor and outdoor units
conforms to the following restrictions.
Where the outdoor unit is above: 15m or less
Where the outdoor unit is below: 15m or less
Is the unit to install in the existing pipe system a
twin-triple-double-twin model?
Is the existing pipe system to reuse free of corrosion, flaws or dents?
Is the existing pipe system to reuse free of gas leaks?
(Check whether refrigerant charge was required frequently for
the system before)
Are there any branch pipes with no indoor unit connected?
Are heat insulation materials of the existing pipe system to
reuse free of peel-offs or deterioration?
(Heat insulation is necessary for both gas and liquid pipes)
Aren't there any loose pipe supports?
No loose pipe supports
Exterior tape
Gas piping
The existing pipe system is reusable.
Insulation
INSTALLATION TEST CHECK POINTS
Check the following points again after completion of the installation, and before turnig on the power. Conduct a test run again and ensure that the unit operates properly.
Explain to the customer how to use the unit and how to take care of the unit following the instruction manual.
After installation
Power cables and connecting wires are securely fixed to the terminal block.
The power supply voltage is correct as the rating.
The drain hose is fixed securely.
Operational valve is fully open.
No gas leaks from the joints of the operational valve.
connection from external force.
Grounding terminal
Please be sure to carry out D-type (type III)
grounding work.
START
NO
YES
NO Which of the following refrigeration oils
does the existing unit use?
Suniso, MS, Barrel Freeze, HAB, Freol,
YES YES
ether oil, ester oil
NO
Check with the flow chart developed for a case where
an existing pipe system is reused for a
YES
twin-triple-double-twin model published as a
technical data sheet.
YES
Change the branching pipe to a specified type.
Change
NO
YES
Repair the damaged parts.
Repair
NO
Check the pipe system for air tightness on the site.
Air tightness is OK
NO
Remove those branches.
NO Remove
Repair the damaged parts.
Repair
NO
Repair the damaged parts.
Some loose pipe supports
Repair
The existing pipe system is not reusable.
Install a new pipe system.
The specifications shown in the above table are for units without heaters. For units with heaters, refer to
the installation instructions or the construction instructions of the indoor unit.
Switchgear or Circuit breaker capacity which is calculated from MAX. over current should be chosen along the
regulations in each country.
The cable specifications are based on the assumption that a metal or plastic conduit is used with no more than
three cables contained in a conduit and a voltage drop is 2%. For an installation falling outside of these
conditions, please follow the internal cabling regulations. Adapt it to the regulation in effect in each country.
<Table of pipe size restrictions>
Standard pipe size Usable
Additional charge volume per meter of pipe
Liquid pipe
Pipe size
Can't
40 Maximum one-way pipe length
Please make an
NO Use
inquiry for
Length covered without additional charge
reusability.
Can Use
50 Maximum one-way pipe length
Length covered without additional charge
60 Maximum one-way pipe length
Length covered without additional charge
Please consult with our distributor in the area, if you need to recover refrigerant and charge it again.
Change is impossible.
Any combinations of pipe sizes not listed in the table are not usable.
Formula to calculate additional charge volume
Repair is impossible.
Additional charge volume (kg) = {Main pipe length (m) – Length covered without additional charge shown in the table (m)}
Air tightness is
impossible.
If you obtain a negative figure as a result of calculation, no additional refrigerant needs to be charged.
Example) When an 60 is installed in a 10m long existing pipe system (liquid
Remove is
impossible the quantity of refrigerant to charge additionally should be (10m-5m) x 0.06kg/m = 0.3 kg.
WARNING <Where the existing unit can be run for a cooling operation.>
Repair is impossible.
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.
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.
<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, please contact our distributor in the area.
The pipe joints for indoor and outdoor pipes have been insulated.
The reverse flow check cap is attached.
The cover of the pipe cover (A) faces downward to prevent rain from entering.
Gaps are properly sealed between the pipe covers (A) (B) and the wall surface / pipes.
Restricted to shorter pipe length limits
0.02kg/m 0.06kg/m
ø6.35 ø9.52
Gas pipe ø 12.7 ø 12.7
Usability
30 10
15 5
Usability
30 10
15 15
Usability
30 10
15 5
Additional charge volume per meter of pipe shown in the table (kg/m)
9.52, gas
If discolored refrigeration oil or any foreign matters is discharged
12.7),