Mitsubishi Electric QAHV-N560YA-HPB Service Handbook page 29

[ II Restrictions ]
<3> Wiring for Configuring Se c ondary Side Control System
To configure a secondary side control system, you need to connect the wiring of the following three devices from
the secondary side water circuit to the primary side unit.
1 Flow sensor 2 Secondary side thermistor
Wiring of secondary side circuit
Perform the installation work of steps (1) to (4) below.
(1) Open the panel.
Use a screwdriver to remove the service panel, terminal block box cover, and control box cover (only for system
using flow rate adjustment valve (two-way valve or three-way valve)).
Service panel
(2) Thread the wiring through into the unit
B
A
(3) Wiring connections
1 Connect the flow sensor and flow rate adjustment device
Terminal block box Flow sensor
Wiring
* For details on the wiring procedure of the separately sold thermistor, refer to the separately sold kit Q-1SCK.
* For a system that outputs the pump on/off signal from the unit (system that uses a flow rate adjustment valve),
connect the wires to 1-3 of CN512.
(4) Close the panel.
Using a screwdriver, re-place the SERVICE PANEL and the CONTROL BOX (SUB) cover.
HWE1517A
C
C
Black
15
14
13
White Red
Terminal block
3 Pump + flow rate adjustment device
(three-way valve, two-way valve, or inverter)
Terminal block box cover
Control box cover
* Remove it only for a
system using a flow
rate adjustment valve.
1 Thread the flow sensor wiring through A in the figure.
2 Hold the wiring with the cable strap inside the unit
indicated as B in the figure to keep it out of contact with
the pipes and other components.
3 Thread the wiring through the rubber bush indicated as
C in the figure (second one from the left).
* For details on the opening procedure of A and the wiring of
B, refer to pages 20 and 21.
Connect the flow sensor wiring to the terminal
Flow rate
block inside the BOX. The numbers on the
adjustment device
wirings correspond to the numbers on the
terminal block.
Connect each wiring to the correct terminal.
When done, hold the excess wiring with the
supplied cable tie (long). Also, hold the wirings
in place with a cable tie (long) where indicated
as B in the figure to keep them out of contact
with the pipes and other components.
* The 10-V power supply to be connected to No.
0-10 V
10 on the terminal block is not supplied.
+10 V GND
Furthermore, make sure that the output of the
10-V power supply is within 10 V ±0.5 V.
- 22 -
GB