Laars MASCOT LX, Руководство по обслуживанию

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42
Mascot LX Service Manual
Fig. B10-1 - Water Pressure Switch
Water pressure switch The water pressure switch will not allow the Mascot LX unit
to operate unless the water pressure is at least 5 p.s.i.
Tools and Equipment Required:
• 14 mm wrench
• Teflon® tape or pipe dope
Replacement Procedure:
1. Turn off power to the unit. Use the main disconnect
switch on the front panel.
2. Turn off all gas valves supplying gas to the unit.
3. Isolate the boiler. Turn off the water shutoff valves
located upstream and downstream of the unit.
4. Drain the boiler.
5. The water pressure switch is mounted in the upper
left corner of the cabinet, as shown in Fig. B10-1.
To get access to the switch, remove the upper front
panel of the cabinet.
6. Unplug the wiring connector. The connector is
locked in place by a “squeeze tab.” Press on the tab
to release the connector.
7. Unscrew the sensor using the 14 mm wrench. Turn
counter-clockwise to unscrew the part.
8. There is no practical way to test the part. If you
suspect it is bad, replace it.
9. 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.
B10
Water Pressure Switch