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UNIT INSTALLATION
6.4 THERMISTOR INSTALLATION
Liquid and gas pipes thermistors
Two type thermistors are supplied inside the control box. The
purpose and identification of each one is as follow:
PCB socket
Item
/ Thermistor
connector color
Liquid pipe thermistor
Gas pipe thermistor
!
C A U T I O N
In case that the thermistors supplied with the DX-Interface are not long
enough, please make sure that the length extension is properly done
avoiding the sensing distortion and that the joint is properly insulated to
avoid any electrical failure.
?
N O T E
When fitting the thermistors, remember that they must be secured
correctly by the special clamp, ensuring the perfect contact between the
pipe and thermistor. Cover it completely with insulation, like cork tape
or pipe insulation, depending on the location. Replace them if damaged
during maintenance work.
Thermistor installation example
Liquid / gas pipe thermistor (factory
1
supplied)
2
Thermistor holder (field supplied)
3
Thermistor lead wire (field supplied)
4
Insulation (field supplied)
!
C A U T I O N
The thermistor must be installed properly in order to avoid water onto the
thermistor.
Typical installation location
Must be installed in the
Liquid pipe
coldest liquid line point in
A
thermistor
the heat exchanger
(prior the distributor).
Must be installed as close
Gas pipe
as possible to the heat
B
thermistor
exchanger refrigerant
outlet.
Air thermistor
Two air thermistors are supplied inside the control box. The
purpose and identification of each one is as follow:
PCB socket
Item
/ Thermistor
connector color
Inlet air thermistor
Blue
Outlet air thermistor
Red
8
PMML0293A rev.2 - 08/2016
PCB
Thermistor
socket
length (mm)
number
Black
THM 3
650
Yellow
THM 5
600
A
PCB socket
Thermistor
number
length (mm)
THM 1
1200
THM 2
1200
!
C A U T I O N
In case that the thermistors supplied with the DX-Interface are not long
enough, please make sure that the length extension is properly done
avoiding the sensing distortion and that the joint is properly insulated to
avoid any electrical failure.
?
N O T E
When fitting the air thermistor, remember that they must be secure
correctly, in an adequate place to avoid external influences, like ambient
conditions, and where the air temperature is significant.
Cable clamp example
1
Tie (Field supplied)
2
Cable clamp (Field supplied)
3
Thermistor (supplied)
!
C A U T I O N
The thermistor must be installed properly in order to avoid water onto the
thermistor.
Typical installation
1
2
3
4
In case of modular outdoor unit installation, it is possible to install air
thermistors only to the DX-Interface set as "group controller". The
thermistors locations must ensure then a proper reading of the air
temperature, representative of the total inlet or outlet air flows of the unit
to be controlled.
?
N O T E
In case of simplified air thermistors installation, only one Remote
Controller can be connected within the DX-Interface gruped together and
B
connected to the same indoor unit (the installations of a second remote
controller is allowed only if it is set as "slave")
Thermistor extension installation
A
A
PCB socket
THM1
THM2
THM3
THM5
B
Thermistor
Thermistor
extension
extension
Blue
Blue
Red
Red
Black
Black
Yellow
Yellow
3
B
Thermistor
Blue
Red
Black
Yellow
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