SYR Low Water Cut-Off 3/4 Type 933.1 for closed systems, # 0933.20.000

The 933 water level limiter serves to protect boilers in hot water heating systems from overheating due to a lack of water. Installation is mandatory for closed heating systems according to DIN EN 12828 with a heating capacity of more than 300 kW. For boilers with a lower heating capacity, installation is mandatory if it cannot be ruled out that impermissible overheating may occur in the event of water shortage. In addition, the 933 water level limiter can be used wherever water level-dependent electrical switching operations are to be triggered and a testing option without lowering the water level is required. The 933 water level limiter is designed as a device with magnetic transmission of the float movement to a microswitch and enables testing without lowering the water level. The electrical switching unit can be rotated by 360° and replaced without draining the system. The 933.1 water level limiter locks after shutdown. Once the fault has been rectified, the system is switched on again using the unlock button on the water level limiter. Technical Data: Operating pressure: max. 10 bar Operating temperature: max. 120 °C Max. ambient temperature: max. 70 °C Protection class: IP 65 Microswitch: 1-pole changeover switch Installation position: Main axis vertical Switch capacity: 10 (4) A / 250 V AC TÜV component identification no.: TÜV - HWB - 16-190 VDE certificate no.: 139223