Mitsubishi Electric CITY MULTI CMB-WP108NU-AA Manual De Instalación página 9

5. Attach the insulating material, and fix it with the band (not supplied) to insulate
the drain port.
Ⓕ
Ⓔ
Ⓐ
Ⓑ Ⓒ Ⓓ
5. Connecting water pipework
Please observe the following precautions during installation.
5.1. Important notes on water pipework
installation
• The design pressure of the HBC controller water system is 0.6 MPa [87 psi].
• Use water pipe-work with a design pressure of at least 1.0 MPa [145 psi].
• When performing a water leak check, please do not allow the water pressure to
go above 0.3 MPa [44 psi].
• Perform a pressure test on the field-installed water pipes at a pressure equal to
1.5 times the design pressure. Before performing a pressure test, isolate the
pipes from HBC controller and indoor units.
• Please connect the water pipework of each indoor unit to the connect port on the
HBC controller. Failure to do so will result in incorrect running.
• Please list the indoor units on the naming plate in the HBC controller with
addresses and end connection numbers.
• Use the reverse-return method to insure proper pipe resistance to each unit.
• Provide some joints and valves around inlet/outlet of each unit for easy
maintenance, checkup, and replacement.
• Install a suitable air vent on the water pipe. After flowing water through the pipe,
vent any excess air.
• Secure the pipes with metal fitting, positioning them in locations to protect pipes
against breakage and bending.
• Do not confuse the water intake and outlet piping especially when connecting the
HBC controller and the Sub-HBC controller.
(Error code 5102 will appear on the remote controller if a test run is performed
with the pipe-work installed incorrectly (inlet connected to outlet and vice versa).)
• This unit doesn't include a heater to prevent freezing within tubes. If the water
flow is stopped on low ambient, drain the water out.
• The unused knockout holes should be closed and the refrigerant pipes, water
pipes, power source and transmission wires access holes should be filled with
putty.
• Install water pipe so that the water flow rate will be maintained.
• Wrap sealing tape as follows.
1 Wrap the joint with sealing tape following the direction of the threads (clock-
wise), do not wrap the tape over the edge.
2 Overlap the sealing tape by two-thirds to three-fourths of its width on each
turn. Press the tape with your fingers so that it is tight against each thread.
3 Do not wrap the 1.5th through 2nd farthest threads away from the pipe end.
• Hold the pipe on the unit side in place with a spanner when installing the pipes or
strainer. Tighten screws to a torque of 40 N·m.
• If there is a risk of freezing, carry out a procedure to prevent it.
• When connecting heat source unit water piping and on site water piping, apply
liquid sealing material for water piping over the sealing tape before connection.
• Please use copper or plastic pipes for the water circuit. Do not use steel or
stainless steel pipework. Furthermore, when using copper pipe-work, use a non-
oxidative brazing method. Oxidation of the pipe-work will reduce the pump life.
• Add water pressure gauge to see if the water pressure in HBC controller is
correct or not.
• Be sure to braze the water pipes after covering a wet cloth to the insulation
pipes of the units in order to prevent them from burning and shrinking by
heat. (There are some plastic parts in HBC controller.)
• Install the unit so that external force is not applied to the water pipes.
• After filling the pipes with water, immediately perform debris removal
operation and air vent operation.
• If you use a hose for water supply, use a new hose-set.
A HBC controller
B Tie band (not supplied)
C Drain socket NPT 3/4 in
D Adapter (not supplied)
E Drain pipe (not supplied)
F Insulating material (not supplied)
2. Discharge test
After completing drain piping work, open the HBC controller panel, and test drain
discharge using a small amount of water. Also, check to see that there is no water
leakage from the connections.
3. Insulating drain pipes
Provide sufficient insulation to the drain pipes just as for refrigerant pipes.
Caution:
Be sure to provide drain piping with heat insulation in order to prevent excess
condensation. Without drain piping, water may leak from the unit causing
damage to your property.
Example of HBC controller installation
[Fig. 5.1.1]
F
B
A
To
G
E
H
I
A Expansion vessel (field supply)
C Strainer (field supply)
E Water inlet
G Drain pipe
I Check valve (field supply)
Note:
• Connect the pipes to the water pipes according to the local regulations.
[Fig. 5.1.2]
A
35 [1-7/16] 25 [1]
B B
G H
C
F E
A Indoor unit connection
C Cut the piping at the cutting point
E Field pipe
G Indoor unit and Sub-HBC controller connecting port
H Water inlet (EXP. VESSEL)
Note:
• Remove burr after cutting the piping to prevent entering the pipe
connection. Prevent the particles that are generated during pipe cutting or
cut edge treatment from entering the pipes.
Check that there is no crack at the edge of the piping.
D
C
B Shutoff valve (field supply)
D Pressure reducing valve (field supply)
F Refrigerant pipes
H Pressure gauge (field supply)
(Unit: mm [in])
D
B Cutting point
D Field pipe connection (field supply)
F Pipe connection (field supply)
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