9
GB
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 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.
•
Please connect the water pipework 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.
•
If the number of indoor units are less than the number of ports on the HBC, the
unused ports can be capped. Without a cap, water will leak.
•
Use the reverse-return method to insure proper pipe resistance to each unit.
•
Provide some joints and bulbs around inlet/outlet of each unit for easy mainte-
nance, 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.
(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 stain-
less steel pipework. Furthermore, when using copper pipe-work, use a non-oxi-
dative brazing method. Oxidation of the pipe-work will reduce the pump life.
Example of heat source unit installation (using left piping)
[Fig. 5.1.1] (P.4)
5.2. Water pipe insulation
1. Connect the water pipes of each indoor unit to the same (correct) end connection
numbers as indicated on the indoor unit connection section of each HBC control-
ler. If connected to wrong end connection numbers, there will be no normal oper-
ation.
2. List indoor unit model names in the name plate on the HBC controller control box
(for identification purposes), and HBC controller end connection numbers and
address numbers in the name plate on the indoor unit side.
Seal unused end connections using cover caps (field supply, dezincification
resistant brass (DZR) or bronze only). Not replacing the rubber end caps will lead
to water leakage.
3. Be sure to add insulation work to water piping by covering water pipework sepa-
rately with enough thickness heat-resistant polyethylene, so that no gap is
observed in the joint between indoor unit and insulating material, and insulating
materials themselves. When insulation work is insufficient, there is a possibility of
condensation, etc. Pay special attention to insulation work in the ceiling plenum.
[Fig. 5.2.1] (P.4)
•
Insulation materials for the pipes to be added on site must meet the following
specifications:
•
This specification is based on copper for water piping. When using plastic pipe-
work, choose a thickness based on the plastic pipe performance.
•
Installation of pipes in a high-temperature high-humidity environment, such as
the top floor of a building, may require the use of insulation materials thicker than
the ones specified in the chart above.
•
When certain specifications presented by the client must be met, ensure that
they also meet the specifications on the chart above.
4. Expansion tank
•
Install an expansion tank to accommodate expanded water.
Expansion tank selection criteria:
• The water containment volume of the HBC and the indoor unit.
• The maximum water temperature is 60°C.
• The minimum water temperature is 5°C.
• The circuit protection valve set pressure is 370-490kPa.
• The circulation pump head pressure is 0.24MPa.
5. Leakproof the water pipework, valves and drain pipework. Leakproof all the way
to, and include pipe ends so that condensation cannot enter the insulated pipe-
work.
6. Apply caulking around the ends of the insulation to prevent condensation getting
between the pipework and insulation.
7. Add a drain valve so that the unit and pipework can be drained.
8. Ensure there are no gaps in the pipework insulation. Insulate the pipework right
up to the unit.
9. Ensure that the gradient of the drain pan pipework is such that discharge can
only flow out.
10. HBC water pipe connection sizes and pipe sizes.
[Fig. 5.2.2] (P.4)
Note:
*1. Connection of multiple indoor units with one connection (or joint pipe)
•
Total capacity of connectable indoor units: Less than 80
•
Number of connectable indoor units: Maximum 3 Sets
•
Selection of water piping
Select the size according to the total capacity of indoor units to be installed down-
stream.
•
Please group units that operate on 1 branch.
11. Please refer to the [Fig. 5.2.3] when connecting the water supply.
[Fig. 5.2.3] (P.4)
12. Use formula 0.1 < 0.01 + 0.01 x A < 0.16 for the supply pressure range to be
used.
(A: Head pressure (m) between the HBC and the highest indoor unit)
If the supply pressure is greater than 0.16 MPa, use a pressure reducing valve to
keep the pressure within the range.
If the head pressure is unknown, set it to 0.16 MPa.
13. Install a shut off valve and strainer in a place that is easy to operate and makes
maintenance work easy.
14. Apply insulation to the indoor unit pipework, strainer, shut off valve, and pressure
reducing valve.
A
Expansion tank
B
Shutoff valve
C
Strainer
D
Pressure reducing valve
E
Water inlet
F
Refrigerant pipes
G
Drain pipe
A
Locally procured insulating material for pipes
B
Bind here using band or tape.
C
Do not leave any opening.
D
Lap margin: more than 40 mm
E
Insulating material (field supply)
F
Unit side insulating material
HBC controller
20 mm or more
-indoor unit
Indoor unit
Connection size
Pipe size
Water inlet
Water outlet
Water out
Water return
PEFY-WP·VMA
Rc 3/4
screw
Rc 3/4
screw
I.D. 20 mm
I.D. 20 mm
A
To outdoor unit
B
End connection (brazing)
C
HBC controller
D
Indoor unit
E
Twinning pipe (field supply)
F
Up to three units for 1 branch hole; total capacity: below 80 (but in same mode, cool-
ing/heating)
A
HBC controller
B
Water pipe
C
Pressure reducing valve
D
Strainer
E
Shut off valve
(Unit: L)
Unit model
Water volume
HBC Controller
10
PEFY-WP20VMA
0.7
PEFY-WP25VMA
1
PEFY-WP32VMA
PEFY-WP40VMA
1.8
PEFY-WP50VMA
D
D
D
D
D
F
D
A B
E
*1
C
Water pipework is screw
connections
WT06421X02.book Page 9 Wednesday, April 25, 2012 8:43 AM
