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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.
•
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 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.
•
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 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 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 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.
•
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.)
Example of HBC controller installation
[Fig. 5.1.1] (P.4)
A Expansion vessel (field supply)
C Strainer (field supply)
E Water inlet
G Drain pipe
I Check valve (field supply)
[Fig. 5.1.2] (P.4)
A Indoor unit connection
C Cut the piping at the cutting point
E Field pipe
[Fig. 5.1.3] (P.5)
A HBC controller
C To Sub-HBC controller (Hot water)
E To Sub-HBC controller (Cold water)
Note: Remove burr after cutting the piping to prevent entering the pipe con-
nection.
Check that there is no crack at the edge of the piping.
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 controller.
If connected to wrong end connection numbers, there will be no normal operation.
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.
In case of using cover caps for unused end connections, please use dezincifica-
tion resistant brass (DZR) (field supply). Not using the rubber end caps will lead
to water leakage.
B Shutoff valve (field supply)
D Pressure reducing valve (field supply)
F Refrigerant pipes
H Pressure gauge (field supply)
B Cutting point
D Field pipe connection (field supply)
F Pipe connection (field supply)
B Sub-HBC controller
D From Sub-HBC controller (Hot water)
F From Sub-HBC controller (Cold water)
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.5)
A Locally procured insulating material for pipes
B Bind here using band or tape.
D Lap margin: more than 40 mm
F Unit side insulating material
•
Insulation materials for the pipes to be added on site must meet the following
specifications:
HBC controller
20 mm or more
-indoor unit
HBC controller
20 mm or more
-Sub-HBC controller
•
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 vessel
•
Install an expansion vessel to accommodate expanded water.
•
Please install expansion vessel at same height level of HBC.
Expansion vessel selection criteria:
• The water containment volume of the HBC and the indoor unit.
Unit model
HBC Controller
PEFY-WP20VMA
PEFY-WP25VMA
PEFY-WP32VMA
PEFY-WP40VMA
PEFY-WP50VMA
* For other indoor units, refer to the installation manual for
each.
• 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.
• The design pressure of the expansion vessel is the charged water pressure
(the reading of the pressure gauge).
• Tank volume of expansion vessel is as follows:
Tank volume = ε × G/(1 - (Psupply + 0.1)/0.29) × 1.2
ε = The expansion coefficient of water
(= 0.0171)
* Please choose ε for using antifreeze solution on the type and temperature range
used.
ε = Max density/Min density - 1
G [L] = (HBC [L] + Indoor unit [L] + Pipe [L]) × 1.1
Psupply: Water supply pressure [MPa]
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 blow out.
10. HBC water pipe connection sizes and pipe sizes.
[Fig. 5.2.2] (P.5)
Connection size
Indoor unit
Water inlet
Rc 3/4
PEFY-WP·VMA
screw
* For other indoor units, refer to the indoor unit installation manual.
A To outdoor unit
B End connection (brazing)
C Main-HBC controller
D Sub-HBC controller
E Indoor unit
F Twinning pipe (field supply)
C Do not leave any opening.
E Insulating material (field supply)
(Unit: L)
Water volume
10
0.7
1
1.8
Pipe size
Water outlet
Water out
Water return
Rc 3/4
I.D. 20 mm
I.D. 20 mm
screw
11
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