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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
(mg Cl
Sulfate ion
(mg SO
Standard
items
Acid consumption (pH 4.8)
(mg CaCO
Total hardness
(mg CaCO
Calcium hardness (mg CaCO
Ionic silica
(mg SiO
Iron
(mg Fe/ℓ) 1.0 or less
Copper
(mg Cu/ℓ) 1.0 or less
Sulfide ion
(mg S
Refer-
ence
Ammonium ion
(mg NH
items
Residual chlorine
(mg Cl/ℓ) 0.25 or less
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.
4 When replacing a previously installed air conditioning device (even when
only the heat exchanger is being replaced), first conduct a water quality
analysis 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.
8.4. Pump interlock
The heat source unit may become damaged if it is operated with no water
circulating through the pipes.
Interlock unit operation and the water-circuit pump. Use the terminal blocks for
interlocking (TB8-1, 2, 3, 4) that can be found on the unit.
Connect the pump interlock circuit signal cable to the TB8-3, 4. Also, use
pressure valve 63PW with a minimum current of 5mA or less to prevent miss
detection due to poor connection.
Pump interlock cords of parts of appliances for heat source use shall not be
lighter than polychloroprene sheathed flexible cord (design 245 IEC 57).
[Fig. 8.4.1] (P.4)
Pump interlock circuit connection (field-supplied)
A
[Fig. 8.4.2] (P.4)
This circuit is for interlocking of the heat source unit operation and the water-
circuit pump.
Heat source unit
A
To next heat source unit
C
Pump interlock
E
X
: Relay
FS
: Flow switch
52P
: Magnetic contactor for water circuit pump
MP
: Water circuit pump
MCB
: Circuit breaker
* Use an insulated ring terminal to connect the wiring to TB8.
Terminal
TB8-1, 2
No.
Output
Relay contacts output
Operation
• When setting No. 917 for Dip switch SW4 (Dip switch
SW6-10 is ON) is OFF.
The relay closes during compressor operation.
SW4 0: OFF, 1: ON
1
2
3
4
1
0
1
0
• When setting No. 917 for Dip switch SW4 (Dip switch
SW6-10 is ON) is ON.
The relay closes during reception of cooling or the
heating operation signal from the controller.
(Note: It outputs even if the thermostat is OFF (when the
compressor is not operating).)
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]
/ℓ)
50 or less
50 or less
-
/ℓ)
50 or less
50 or less
2-
4
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
0.3 or less
0.1 or less
not to be
not to be
/ℓ)
2-
detected
detected
/ℓ) 0.3 or less
0.1 or less
+
4
0.3 or less
/ℓ) 0.4 or less
4.0 or less
2
–
–
Control panel (field-supplied)
B
Operation ON signal
D
Rated voltage: 220 ~ 240 V
Rated load: 1 A
5
6
7
8
9 10
1
0
0
1
1
1
8.5. Water flow rate control
Precautions on installation work for water flow rate control are as follows.
1 Check that the water circuit parts required for water flow rate control are
Scale-
already installed. [Fig. 8.5.1]
forming
2 Connect the power cables required for water flow rate control. [Fig. 8.5.1]
3 When using a 0-10 VDC output device, the water flow rate can be adjusted
without operating the heat source unit.
Check the flow rate of water supplied to the heat source unit is within the
allowable range.
If a 0-10 VDC output device is not used, skip this check and go to 4.
1. Connect the signal cables for the 0-10 VDC output device and the motor
valve.
2. Power on the pump and motor valve.
3. Check the water flow rate.
• Motor valve specification (0 V: fully open, 10 V: closed)
• When 0 V is output, check the flow rate of water supplied to the heat
source unit does not exceed the upper limit.
When 5.5 V (5 V +10%) is output, check the flow rate of water
supplied to the heat source unit is not less than the lower limit.
• Motor valve specification (0 V: closed, 10 V: fully open)
When 10 V is output, check the flow rate of water supplied to the heat
source unit does not exceed the upper limit.
When 6.8 V (7.6 V -10%) is output, check the flow rate of water
supplied to the heat source unit is not less than the lower limit.
Status
Condition
SW4 (810)
= OFF
SW4 (810)
= ON
Model
P200~P300
P350~P500
P550~P600
4 Connect the signal cables for pump interlock (TB8-3 and 4) and for motor
valve opening command (TB9-5 and 6).
5 If the water flow rate has not been checked in 3 above, check the flow rate
of water supplied to the heat source unit is within the allowable range.
•
Motor valve specification (0 V: fully open, 10 V: closed)
1.
Power on the pump, motor valve, and unit.
2.
Set Dip switch SW6-10 to ON, and No. 810 for Dip switch SW4 to
ON.
3.
When the indoor unit is not operated, check the flow rate of water
supplied to the heat source unit does not exceed the upper limit.
4.
Set Dip switch SW6-10 to ON, and No. 810 for Dip switch SW4 to
OFF.
5.
Operate the indoor unit (cooling or heating mode) from the remote
controller.
6.
When all heat source units are operated in thermo-off state, check
the flow rate of water supplied to the heat source unit is not less than
the lower limit.
•
Motor valve specification (0 V: closed, 10 V: fully open)
1.
Power on the pump , motor valve, and unit.
2.
When the indoor unit is not operated, check the flow rate of water
supplied to the heat source unit does not exceed the upper limit.
3.
Set Dip switch SW6-10 to ON, and No. 810 for Dip switch SW4 to
ON.
4.
Operate the indoor unit (cooling or heating mode) from the remote
controller.
5.
When all heat source units are operated in thermo-off state, check
the flow rate of water supplied to the heat source unit is not less than
the lower limit.
A
B-1
B-2
When
When all heat source units
stopped
are in thermo-off state
SW4 (901)
SW4 (901)
= ON
= OFF
10 V
10 V
5 V
(Minimum
water flow
rate)
0 V
0 V
7.6 V
(Minimum
water flow
rate)
*
Up to approximately 10% output fluctuation can be caused.
Water flow rate range
8~12 HP
3.0~7.2 m
/h (50~120 L/min)
3
14~20 HP
4.5~11.6 m
/h (75~192 L/min)
3
22~24 HP
6.0~14.4 m
/h (100~240 L/min)
3
C
While
compressor
is in
operation
5~0 V
7.6~9.1 V
25
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