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3.5 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
connector color
Liquid pipe thermistor
Gas pipe thermistor
Location of the thermistor of Liquid pipe thermistor:
Install the thermistor in the coldest liquid line point prior
the distributor.
Heat
Exchanger
distributor
Location of the thermistor of Gas pipe thermistor:
Install the thermistor at the outlet of the heat exchanger
as close as possible to the heat exchanger .
Heat
Exchanger
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 .
•
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:
1 Fix the thermistor with insulating aluminum tape
(field-supplied) in order to ensure a good heat
transference. Make good contact between thermistor
and pipe.
Maximize the
contact
Most sensitive
point of the thermistor
PCB
Thermistor
Thermistor
socket
length (m)
number
Black
THM3
THM5
Yellow
2 Put the insulating tape (field-supplied) around the
thermistor in order to avoid loosening of the
thermistor after some years.
2.5
2.5
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
Inlet air thermistor
Outlet air thermistor
Install in location where the effects of heat sources
such as heat exchangers and heaters, etc. are
minimized as far as possible and inlet / outlet air
temperature can be measurable as shown in Fig.2.1.
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.
PCB socket /
PCB
Thermistor
socket
connector color
number
Blue
THM1
THM2
Red
Thermistor
length (m)
2.5
2.5
7
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