Laars MASCOT LX, Руководство по обслуживанию

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58
Mascot LX Service Manual
DHW Temperature Sensor - Combi Units (MXLC)
Fig. B21-1 - DHW High Temperature Limit Sensor
The DHW temperature sensor allows the control system
to monitor the temperature of the water before it goes
to the Domestic Hot Water piping. The sensor uses an
electronic device called a “thermistor.” For instructions
on testing the sensor, see Section B9.
Tools and equipment required:
• Adjustable wrench or combination wrench set
• Pipe dope or Teflon® tape
Replacement procedure:
1. Turn off power to the system. Use the main disconnect switch mounted
on the front panel.
2. Isolate the boiler. Turn off the water shutoff valves located upstream and
downstream of the unit.
3. Drain the DHW piping.
4. Remove the rear cover. The DHW high temperature limit sensor is
mounted in the lower right corner of the rear of the unit. See Fig. B21-1.
5. Unplug the wiring connector (two wires). The connector is locked in
place by a “squeeze tab.” Press on the tab to release the connector.
6. Unscrew the sensor using a wrench. Turn counter-clockwise to unscrew
the part.
7. To reassemble, reverse the process we have just described. Be sure to
use pipe dope or Teflon® tape on the threaded part of the sensor.
DHW
temperature
sensor
Flat-plate heat
exchanger
B21