Mitsubishi Electric e Series Service Handbook page 114

[ VII Control ]
External water temperature sensor TW-TH16
1. Parts that are required to install an external water
temperature sensor
(1) External water temperature sensor
(2) Wiring to connect the sensor and the unit*
(3) Wiring terminals to connect the wiring to the sensor and
the terminal block on the unit
(Four for M4 screws)*
*Items (1) and (2) are field supplied.
2. Installing the external water temperature sensor
Install the external water temperature sensor where the
water pipes merge or on the load-side tank as shown in
the figure at right.
Install horizontally or vertically on top of the pipe.
When installing horizontally, make sure the wire faces
down.
3. Wiring the external water temperature sensor
Connect the external temperature sensor wiring to the terminal block in the control box on the unit as shown in the
figure below.
External water temperature sensor
Sensor wire
Sensor
Sensor properties
· Resistance: R=15KΩ±3% (0 °C)
· B-constant: 3460K
Connect the sensor wiring to terminals T1 and T2 of the 12-pin terminal
block in the control box on the unit.
Connect the shield to the earth terminal.
Thread the wire to the external water temperature sensor through parts
2 through 4 as shown in the figure at right. Attach M4 terminals
(field-supplied) to the wires, and connect them to
Cut the shield wire. Do not connect it to the terminal. (Connect the shield on the
unit side to the ground terminal.)
After the wire is connected, securely tighten the tightening screw
caulk the gap between the wire
from entering.
*1 In a multiple module connection system, install the temperature sensor where the cold/hot water from each module is sufficiently mixed
to provide a representative temperature.
*2 The temperature sensor must be installed on a pipe between the outlet of the unit and the entrance to the load-side system.
*3 The external water temperature sensor must be used at the water flow rate of 3 m/sec or below. Install the sensor so that the sensor
unit (protective tube) will not vibrate due to the effects of swirling or impact flow.
HWE1417B
12-pin terminal block in the control box on the unit
T1
Note
157 42
20 12
R 1/2
and the tightening screw to keep water
1
Wire specifications
Wire size
Type
Maximum length 20 m
Vertical installation
(Note)
Run the sensor wiring at least 5 cm away from any wire that
carries a voltage of 100 V or more, and do not put the sensor
wiring in the same conduit tube with it.
T2
Unit
Control box
54
A
and (terminals A and B).
5 6
, and then
4
- 105 - 105
2-core cable Min. 1.25 mm
CVVS or CPEVS
Horizontal installation
M4 screws × 3
6
5
Terminal block for connection to the sensor
2 Water-sealing rubber
(Internal diameter ø11)
3 Washer (Internal diameter ø12)
4 Tightening screw
(Internal diameter ø15)
Shield (to be cut)
1 Field-supplied wire
Detailed view of the area labeled "A" in the figure above
2
GB