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4.5. Drain piping work
1. Drain piping work for Main-HBC
•
When routing the drain piping from the front or side of the unit, the drain pan does
not need to be reoriented.
•
When connecting the drain piping from behind the unit, change the orientation of
the drain pan before installing the unit.
[Fig. 4.5.1] (P.4)
1
Remove the screws.
2
Remove the cover plate, and then remove the drain pan.
3
Change the orientation of the drain pan so that the drainage hole of the drain
pan is in the rear of the unit.
4
Screw down the drain pan and the cover plate.
•
Sufficient space (over 150 mm) is required on each side of the unit to remove the
screws. If it is difficult to leave sufficient space, change the orientation of the drain
pan before installing the unit.
[Fig. 4.5.2] (P.4)
•
Use a socket to connect the drain piping to the drainage hole of the drain pan.
•
Route the drain piping through the holes for drain piping.
•
Seal the joint between the drainage hole of the drain pan and the socket with a
silicone sealant.
•
Bond the socket and the drain piping with a PVC adhesive.
•
Ensure that the drain piping is downward (sloped gradient of more than 1/100) to
the drainage hole.
•
Do not use any odor trap around the discharge port.
2. Drain piping work for Sub-HBC
•
Ensure that the drain piping is downward (sloped gradient of more than 1/100) to
the Main-HBC (discharge) side. If it is impossible to take any downward pitch,
use an optionally available drain-up mechanism to obtain a downward pitch of
more than 1/100.
•
Ensure that any cross-wise drain piping is less than 20 m. If the drain piping is
long, support it with metal brackets to prevent it from bending, warping, or
vibrating.
•
Connect the supplied drain hose to the discharge port on the unit body. Use hard
vinyl chloride pipes VP-25 (ø32) for drain piping (
2
). Tighten the supplied drain
hose onto the discharge port using the supplied hose band. (For this, do not use
any adhesive because the drain hose will need to be removed for servicing at a
later date.)
•
Do not use any odor trap around the discharge port.
[Fig. 4.5.3] (P.4)
•
As shown in
3
, install a collecting pipe about 10 cm below the drain ports and
give it a downward pitch of more than 1/100. This collecting pipe should be of VP-
30.
[Fig. 4.5.4] (P.4)
3. Drain piping work for Main-HBC and Sub-HBC
•
Set the end of drain piping in a place without any risk of odor generation.
•
Do not put the end of drain piping into any drain where ionic gases are
generated.
•
Drain piping may be installed in any direction. However, please be sure to
observe the above instructions.
4. Discharge test
After completing drain piping work, open the HBC panel, and test drain discharge
using a small amount of water. Also, check to see that there is no water leakage from
the connections.
5. 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.
5. Connecting water piping work
Please observe the following precautions during installation.
5.1. Important notes on water piping work
installation
•
The design pressure of the HBC water system is 0.6MPa.
•
Use water pipe-work with a design pressure of at least 1.0MPa.
•
When performing a water leak check, please do not allow the water pressure to
go above 0.3MPa.
•
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 and indoor units.
•
Please connect the water piping work of each indoor unit to the connect port on
the HBC. Failure to do so will result in incorrect running.
•
Please list the indoor units on the naming plate in the HBC unit 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 and the Sub-HBC.
(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.
•
Please use copper or plastic pipes for the water circuit. Do not use steel or
stainless steel piping work. 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 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.)
•
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.
Example of HBC installation
[Fig. 5.1.1] (P.5)
Note:
*1. Connect the pipes to the water pipes according to the local regulations.
*2. Remove the water pipes on the point of outside shutoff valve after finishing
supply water.
[Fig. 5.1.2] (P.5)
A
Screws
B
Cover plate
C
Drain pan
<A> Front view
<B> Back view
<C> Top view for drain pan
A
Holes for drain piping (field supply)
B
Drain pan
C
Socket (field supply)
D
Drain piping (field supply)
E
Insulation for drain piping (field supply)
A: 25 cm
B: 1.5 – 2 m
A
Downward gradient of more than 1/100
B
Insulating material
C
Supporting bracket
D
Sub-HBC
E
Tie band (accessory)
F
Insertion margin
G
Drain hose (accessory)
H
Drain pipe (O.D. ø32 PVC TUBE, field supply)
I
Insulating material (field supply)
J
Tie band (accessory)
A
Sub-HBC
B
Indoor unit
C
Collecting pipe
D
Please ensure this length is at least 100 mm.
A
Expansion vessel (field supply)
B
Shutoff valve (field supply)
C
Strainer (field supply)
D
Pressure reducing valve (field supply)
E
Water inlet
F
Refrigerant pipes
G
Pressure gauge (field supply)
H
Check valve (field supply)
A
Indoor unit connection
B
Sub-HBC connection
C
Main-HBC connection
D
Cutting point
E
Cut the piping at the cutting point
F
Field pipe connection (field supply)
G
Field pipe
H
Pipe connection (field supply)
I
Indoor unit and Sub-HBC connecting port
J
Water inlet (EXP. VESSEL)
01_WT09805X01_en.book 14 ページ ２０２１年１１月１日 月曜日 午前８時４７分
