Pump Interlock - Mitsubishi Electric CITY MULTI PQHY-P-TLMU-A1 Manual De Instalación

2 Water quality standard
Items
Sulfate ion (mg SO4 2-
Standard
items
(mg CaCO
3
Total hardness (mg CaCO
3
Calcium hardness (mg CaCO
3
Ionic silica (mg SiO
2
2-
Refer-
ence
Ammonium ion (mg NH 4 +
items
Free carbon dioxide (mg CO
2
Ryzner stability index
Reference : Guideline of Water Quality for Refrigeration and Air Conditioning
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
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
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
[Fig. 8.4.1] (P.4)
A
[Fig. 8.4.2] (P.4)
This circuit is for interlocking of the heat source unit operation and the water-
circuit pump.
A Heat source unit
C To next heat source unit
E Pump interlock
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
is OFF.
The relay closes during compressor operation.
SW4 0: OFF, 1: ON
1 2 3 4 5
1 0 1 0 1
When setting No.917 for Dip switch SW4 (Dip switch
The relay closes during reception of cooling or the heat-
ing operation signal from the controller.
(Note: It outputs even if the thermostat is OFF (when the
26
Low to mid-range
Tendency
temperature water system
Recirculating
water Make-up Scale-
Corrosive
[20<T<60°C] water forming
[68<T<140°F]
7.0 ~ 8.0 7.0 ~ 8.0
30 or less 30 or less
[300 or less] [300 or less]
50 or less 50 or less
50 or less 50 or less
50 or less 50 or less
70 or less 70 or less
50 or less 50 or less
30 or less 30 or less
1.0 or less 0.3 or less
1.0 or less 0.1 or less
not to be not to be
detected detected
0.3 or less 0.1 or less
0.25 or less 0.3 or less
0.4 or less 4.0 or less
– –
B
D Operation ON signal
Rated voltage: ~ 208/230 V
Rated load: 1 A
6 7 8 9 10
0 0 1 1 1
ON.
1
already installed. [Fig. 8.5.1]
2
3
without operating the heat source unit.
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.
source unit does not exceed the upper limit.
supplied to the heat source unit is not less than the lower limit.
source unit does not exceed the upper limit.
supplied to the heat source unit is not less than the lower limit.
Status A
Condition When
When all heat source units
stopped
are in thermo-off state
= ON
10 V 10 V
= OFF
0 V 0 V
= ON
*
Model
P72~P120 7.5~12.5 HP
P144~P192 15~20 HP
P216~P240 22.5~25 HP
4
5
of water supplied to the heat source unit is within the allowable range.
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.
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.
controller.
6. When all heat source units are operated in thermo-off state, check
the lower limit.
1. Power on the pump , motor valve, and unit.
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.
controller.
5. When all heat source units are operated in thermo-off state, check
the lower limit.
B-1 B-2 C
While
compressor
is in
operation
= OFF
5 V 5~0 V
(Minimum
7.6 V 7.6~9.1 V
(Minimum
3.0~7.2 m 3
4.5~11.6 m 3
6.0~14.4 m 3
3