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•
When the junction pipes are connected to 16 Sub-HBC ports, the branched sides
of the junction pipes cannot be connected to the ports "4 and 5," "8 and 9," or "12
and 13" at the same time. (See Fig. B.)
•
When the junction pipes are connected to 8 Sub-HBC ports, the branched sides
of the junction pipes cannot be connected to the ports "4 and 5" at the same time.
(See Fig. C.)
•
When a W/WP/WL100 or a 125 model indoor unit is connected to an HBC, the
pipes that connect the unit to the same set of HBC ports cannot be branched out
to connect additional units.
*3. Selecting the port for indoor unit connection
•
The table below shows the ports for connecting the units that belong to Group 1
and Group 2.
Group 1
CMB-WM350/500F-AA
Ports from 1 to 3
CMB-WM108V-BB
Ports from 1 to 4
CMB-WM1016V-BB
Ports from 1 to 4
Ports from 9 to 12
10. Please refer to the [Fig. 5.1.6] when installing auto air vent valves.
[Fig. 5.1.6] (P.6)
A Connection pipe from Sub-HBC
B Connection pipe from indoor unit
C Auto air vent
D T-joint
E Piping for Sub-HBC or indoor unit side
F Piping for Main-HBC side
11. Use formula 0.1 [MPa] < 0.01 + 0.01 x A < 0.16 [MPa] 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.
12. Before performing a pressure test on the pipes in the water circuit, be sure to
install a shutoff valve on the inlet/outlet water pipes of the indoor units.
13. Please do not use a corrosion inhibitor in the water system.
14. When installing the HBC unit in an environment which may drop below 0°C,
please add antifreeze solution (Propylene Glycol only) to the circulating
water according to the local regulations.
5.2. Water pipe insulation
1. Be sure to add insulation work to water piping by covering water piping work sep-
arately 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.7)
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 - indoor unit
Thickness
HBC - Sub-HBC
•
This specification is based on copper for water piping. When using plastic piping
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.
2. Apply insulation to the indoor unit piping work, strainer, shutoff valve, and pres-
sure reducing valve.
16
Group 2
Ports from 4 to 6
Ports from 5 to 8
Ports from 5 to 8
Ports from 13 to 16
C Do not leave any opening.
E Insulating material (field supply)
20 mm or more
20 mm or more
5.3. Water treatment and quality control
To preserve water quality, use the closed type of water circuit. When the circulating
water quality is poor, the water heat exchanger can develop scale, leading to a
reduction in heat-exchange power and possible corrosion. Pay careful attention to
water processing and water quality control when installing the water circulation
system.
•
Removing of foreign objects or impurities within the pipes.
During installation, make sure that foreign objects, such as welding fragments,
sealant particles, or rust, do not enter the pipes.
•
Water Quality Processing
1 Depending on the quality of the cold-temperature water used in the
airconditioner, the copper piping of the heat exchanger may corrode.
Regular water quality processing is recommended.
If a water supply tank is installed, keep air contact to a minimum, and keep
the level of dissolved oxygen in the water no higher than 1mg/ℓ.
2Water quality standard
Items
pH (25°C) [77°F]
Electric conductivity
(mS/m) (25°C) [77°F]
(µ s/cm) (25°C) [77°F]
Chloride ion
Sulfate ion
(mg SO4
Acid consumption (pH4.8)
(mg CaCO
Total hardness
(mg CaCO
Calcium hardness
(mg CaCO
Ionic silica
(mg SiO
Iron
Copper
Sulfide ion
Ammonium ion
(mg NH
Residual chlorine
Free carbon dioxide
(mg CO
Ryzner stability index
Reference : Guideline of Water Quality for Refrigeration and Air Conditioning
Equipment. (JRA GL02E-1994)
3 Consult with a specialist about water quality control methods and calculations
before using anti-corrosive solutions.
Low to mid-range
Tendency
temperature water system
Recirculating
water
Make-up
Corrosive
[20<T<60°C]
water
[68<T<140°F]
7.0 ~ 8.0
7.0 ~ 8.0
30 or less
30 or less
[300 or less]
[300 or less]
(mg Cl-/ℓ) 50 or less
50 or less
/ℓ) 50 or less
50 or less
2-
50 or less
50 or less
/ℓ)
3
/ℓ) 70 or less
70 or less
3
/ℓ) 50 or less
50 or less
3
/ℓ) 30 or less
30 or less
2
(mg Fe/ℓ) 1.0 or less 0.3 or less
(mg Cu/ℓ) 1.0 or less 0.1 or less
not to be
not to be
(mg S
/ℓ)
2-
detected
detected
/ℓ) 0.3 or less 0.1 or less
+
4
(mg Cl/ℓ) 0.25 or less 0.3 or less
/ℓ) 0.4 or less 4.0 or less
2
6.0 ~ 7.0
–
Scale-
forming
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