Mitsubishi Electric QAHV-N136TAU-HPB Data Book page 14

1. Product Specifications
External water temperature sensor TW-TH16
1. Parts that are required to install an external water temperature sensor
A) External water temperature sensor
B) Wiring to connect the sensor and the unit*
C) Wiring terminals to connect the wiring to the sensor and the terminal block
on the unit
(Four for M4 screws)*
* Items B) and C) 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.
Install horizontally or vertically on top of the pipe.
When installing horizontally, make sure the wiring faces down.
Vertical installation
3. Wiring the external water temperature sensor
Connect the external water 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 wiring
Note
157 (6-3/16)
Sensor
Sensor properties
· Resistance: R=15KΩ±3% (0 °C (32 °F))
· 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 wiring to the external water temperature sensor
through parts b) through d) as shown in the figure at right. Attach
M4 terminals (not supplied) to the wirings, and connect them to
e) and f) (terminals A and B).
After the wiring is connected, securely tighten the tightening
screw d), and then caulk the gap between the wiring a) and the
tightening screw to keep water from entering.
MEES22K030
12-pin terminal block in the control box on the unit
T1 T2
Control box
42 (1-11/16) 54 (2-3/16)
20 (13/16) 12 (1/2)
R 1/2
A
Wiring specifications
Size
Type
Maximum length
Horizontal installation
(Note)
Run the sensor wiring at least 5 cm (2 in.) 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.
Unit
f)
Terminal block for connection to the sensor
Detailed view of the area labeled "A" in the figure above
2-core cable (Min.1.25 mm
CVVS or CPEVS
20 m (66 ft)
Unit: mm (in.)
M4 screws × 3
Terminal screws
e)
b) Water-sealing rubber
(Internal diameter ø11 (ø7/16))
c) Washer (Internal diameter ø12 (ø1/2))
d) Tightening screw
(Internal diameter ø15 (ø5/8))
Shield (to be cut)
a) Field-supplied wire
2
)
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