67
Flushing and Oil Feed Start
Thermostat ATH 22
(only for heavy oil)
Operation
The surface-type dual-thermostat works
according to the principle of volumetric
expansion. If the temperature of the
fluid in the sensor system consisting of
sensor, capillary line and membrane
changes this will also cause the volume
to change. The resultant lifting move-
ment of the membrane will actuate the
quick-break switch via a lever.
Switching function TR/TW/STW(STB)
If the temperature available at the tem-
perature sensor exceeds the limit set-
ting this will cause the switching ram of
the microswitch to be relieved of load
via the sensor system and the electric
circuit opened or closed. In case the
temperature falls below the limit setting
(by the switching difference) the micro-
switch will be returned to its initial posi-
tion.
Temperature sensor with and without
protective sleeve
The temperature will be sensed by
means of the temperature sensor. Make
sure the temperature sensor is immer-
sed in the fluid over its full length
because otherwise the switching point
may be subject to larger variations.
1 Remote line 2 Temperature sensor
3 Protective sleeve 4 Pressure spring
For code „f“ and connection mode „Ü“
the temperature sensor will be locked
by fitting a clamp to the capillary line
and securing the same by a screw in
the extended sleeve opening. For codes
„f“ and connection modes B, C, D, E,
ES, Q and V the sensor is locked by the
manufacturer by means of the terminal
attached to the capillary line.
Electrical connection
1. Opening the housing
Remove the two sealable fillister-head
screws (1) at the housing top (2) and
remove the latter.
1 Sealable screws 2 Housing top
3 Housing bottom 4 Housing journal
2. Connection
Feed the line through the self-sealing
grommet Pg 11 and connect as shown
on the connection diagram. The con-
nection diagrams relating to the thermo-
stats are fixed to the inside of their
housing tops.
5 Terminal screw
6 Restart button (must move freely)
7 For type attachments s, g and b
8 For type attachment r
9 Self-sealing grommet Pg 11
Connection diagram
Codes 11, 12, 22, 120, 220, 2020
System I and II with change-over con-
tact.
Technical data
Setpoint adjustment:
For code 1:
Adjust switching point from outside by
turning the setpoint screw accordin-
gly.
For codes 2, 20, 7, 70:
Remove the top of the housing and
adjust the switching point by turning
the setpoint screw with a screw driver
watching the interior scale.
Adjusting range: 20-150°C
Maximum switching current:
AC 250 V, 10(2) A, cos
ϕ
=1(0.6)
DC 250 V, 0.25 A
Switching difference in measuring
system filled with liquid
TR, TW 3+1% standard feature
6+2% on request
1.5 ± 0.5% against extra price
Permissible ambient temperature
on switching head and remote line
in use filled with liquid or gas max.
+80°C
Operating fluid
water, oil, air, superheated steam
Protection classification
EN 60 529-IP54