7
3.5 Thermistor Installation
Liquid and gas pipes thermistors
Item
PCB socket /
Thermistor
connector color
PCB
socket
number
Thermistor
length (m)
Two type thermistors are supplied inside the control
box. The purpose and identification of each one is
as follow:
Liquid pipe thermistor
Gas pipe thermistor
Black
THM5
Yellow
THM3
2.5
2.5
Location of the thermistor of Liquid pipe thermistor:
Location of the thermistor of Gas pipe thermistor:
Install the thermistor in the coldest liquid line point prior
the distributor.
Install the thermistor at the outlet of the heat exchanger
as close as possible to the heat exchanger .
In case that the thermistors supplied with AHU Connection
Kit 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 and waterproof to
avoid any electrical failure.
Fixing the thermistor:
Heat
Exchanger
Heat
Exchanger
distributor
C A U T I O N
Put the thermistor cable slightly down to avoid water
accumulation on top of the thermistor and add a
pull-relief to the thermistor cable to avoid strain on the
thermistor cable .
•
•
1 Fix the thermistor with insulating aluminum tape
(field-supplied) in order to ensure a good heat
Most sensitive
point of the thermistor
Maximize the
contact
2 Put the insulating tape (field-supplied) around the
thermistor in order to avoid loosening of the
thermistor after some years.
3 Fasten the thermistor with 2 cord clamps
(field-supplied).
4 Insulate the thermistor with the insulation sheet
(field-supplied).
Air thermistor
Two air thermistors are supplied inside the control
box. The purpose and identification of each one is
as follow:
Item
PCB socket /
Thermistor
connector color
PCB
socket
number
Thermistor
length (m)
Inlet air thermistor
Outlet air thermistor
Blue
THM2
Red
THM1
2.5
2.5
Install in location where the effects of heat sources
minimized as far as possible and inlet / outlet air
transference. Make good contact between thermistor
and pipe.
such as heat exchangers and heaters, etc. are
C A U T I O N
•
In case that the thermistors supplied with AHU Connection
Kit 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 and waterproof to
avoid any electrical failure.
•
Fix the thermistors securely with cord clamps in proper
place.
temperature can be measurable as shown in Fig.2.1.
