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[Fig. 7.2.3] (P.3)
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)
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. 7.2.4] when connecting the water supply.
[Fig. 7.2.4] (P.4)
A
Indoor unit
C
Water pipe: To HBC unit
D
Strainer (40 mesh or more)
(field supply)
12. Install a shut off valve and strainer in a place that is easy to operate and makes
maintenance work easy.
13. Apply insulation to the indoor unit pipework, strainer, shut off valve, and pressure
reducing valve.
14. Please do not use a corrosion inhibitor in the water system.
7.3. 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 scales, 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 sys-
tem.
•
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 aircondi-
tioner, 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.
8. Duct work
•
In connecting duct, insert canvas duct between unit and duct.
•
Use incombustible material for duct parts.
•
Provide full insulation to inlet duct flange and outlet duct to prevent condensation.
•
Be sure to change the position of air filter to the position where it can be serviced.
[Fig. 8.0.1] (P.4)
<A> In case of rear inlet
<B> In case of bottom inlet
A
Duct
C
Access door
E
Ceiling surface
G
Leave distance enough to prevent short cycle
•
Procedure for changing the rear inlet to the bottom inlet.
[Fig. 8.0.2] (P.4)
A
Filter
1. Remove air filter. (First remove filter lock screw.)
2. Remove the bottom plate.
3. Fit the bottom plate to the rear of the body. [Fig. 8.0.3] (P.4)
(Position of lug-holes on the plate are different from those for rear inlet.)
When the plate is attached on
the rear side, it exceeds the
height of the rear body panel.
Replicate the plate along the slit
when there is not enough room
above for the entire unit.
10
B
Water pipe: From HBC unit
E
Shut off valve
(field supply)
B
Air inlet
D
Canvas duct
F
Air outlet
B
Bottom plate
2 Water 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 inde
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.
4 When replacing a previously installed air conditioning device (even when
only the heat exchanger is being replaced), first conduct a water quality anal-
ysis and check for possible corrosion.
Corrosion can occur in cold-water systems even if there has been no prior
signs of corrosion.
If the water quality level has dropped, adjust water quality before replacing
the unit.
4. Fit filter to the underside of the body.
(Be careful of which side of the filter to fit.) [Fig. 8.0.4] (P.4)
[Fig. 8.0.4] (P.4)
C
Nail for the bottom inlet
Caution:
•
Inlet duct of 850 mm or more should be construted.
To connect the air conditioner main body and the duct for potential equali-
zation.
•
To reduce the risk of injury from metal sheet edges, wear protective gloves.
•
To connect the air conditioner main body and the duct for potential equali-
zation.
•
The noise from the intake will increase dramatically if intake is fitted
directly beneath the main body. Intake should therefore be installed as far
away from the main body as possible.
Particular care is required when using it with bottom inlet specifications.
•
Install sufficient thermal insulation to prevent condensation forming on
outlet duct flanges and outlet ducts.
•
Keep the distance between the inlet grille and the fan over 850 mm.
If it is less than 850 mm, install a safety guard not to touch the fan.
•
To avoid electrical noise interference, do not run transmission lines at the
bottom of the unit.
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
–
D
Nail for the rear inlet
Scale-
forming
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