PLANAR
Edition 1
March 2016
Page. 17 of 29
Fig.7 – Overheat sensor
Fig.7а – Closed Wires
Install replacement heat sensor in reverse order.
Remove dirt or oil from contacts with a clean cloth soaked with degreaser. Upon
detection oxidation on contacts, clean them with fine sandpaper, wash with degreaser, and
tighten for proper connection.
5.3.2 Thermocouple overheat sensor.
Since November 2015, heaters PLANAR-44D and PLANAR-8DM are equipped
with a thermocouple overheat sensor. PLANAR-2D has always been equipped with this
sensor.
The sensor is mounted on the heat exchanger and
made in a form of ring with an inbuilt thermocouple with
two conductors. For heaters PLANAR-2D it performs the
functions of overheat sensor and flame indicator (Fig.8).
During operation, the sensor monitors the temperature of
the heat exchanger. When heat exchanger temperature
goes
exceeds
250°C, the heater shuts down
automatically. The sensor has to be replaced if the heater
shuts down as described in Table 2.
Disassembly is performed according to Section 4.
To dismount the sensor from the heater, remove the lock
washer and the sensor (Fig.8).
Installationreplacement overheat sensor in reverse
order. The lock washer should be replaced with a new
one.
Рис.8 – Overheat Sensor
(thermocouple)
