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JUMO Room thermostats
Type ATHR
Brief description
Type ATHR room thermostats are used in HVAC, in industrial and commercial premises, garden
centers and stables for the control of heating/cooling, air-conditioning and ventilation systems.
Room thermostats in the ATHR series operate on the principle of liquid expansion. A tempera-
ture change in the liquid-filled sensing system, which consists of probe, capillary and dia-
phragm, produces a volume change. The resulting movement of the diaphragm operates a
microswitch through a lever mechanism.
Switching action
Temperature controller TR and temperature monitor TW
If the temperature at the probe exceeds the set limit, the circuit is opened through a snap-action
switch. If the temperature falls below the set limit (by the switching differential), the switch re-turns to its initial position.
Types
Single thermostats
ATHR-1 temperature controller TR
switching point externally adjustable
ATHR-2 temperature monitor TW
switching point adjustable after removing case cover
Twin thermostats
ATHR-11 2 x temperature controller TR
ATHR-12 1 x temperature controller TR / 1 x temperature monitor TW
ATHR-22 2 x temperature monitor TW
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