Bird Technologies 8630B Series - Manual (Page 36)

Bird 8630B Series Moduload RF Load Resistor
20
Water Flow Switch The water flow switch should be inspected periodically for
accumulated scale and cleaned, if necessary, to permit free movement
of the sliding valve. This needs to be done after three to six months of
operation, depending on the amount of use. This should be done by
removing only the wired sensor plug using the following steps:
1. Drain the unit of its coolant.
2. Unscrew, counterclockwise, the 1-1/2 inch collar that holds the
sensor plug in the flow switch body.
3. Carefully pull the sensor plug out of the body, do not lose the
spring and sliding valve on the sensor plug stem.
4. Reverse the above steps to assemble.
The component is nonrepairable and must be replaced if its
performance is faulty. Operation can be checked by monitoring the
interlock circuits while starting or stopping the pump/motor with the
RF power off.
Routine Service
Checks
When the equipment is in use inspect the coolant level at regular
intervals. Normally check once or twice a week, more often if it is
used continuously or under high ambient temperatures. The coolant
level should remain at the upper gauge mark on the back panel,
whether the unit is running or not. For test measurement and
addition of liquid if required, Refer to the Coolant paragraph in
chapter 3. Use only distilled water and industrially pure ethylene
glycol. Do not use automotive antifreeze or deionized water.
Flushing the
System
Whenever maintenance work has been performed, including resistor
repair, or there is a reason to suspect that contamination has been
introduced or dislodged into the coolant, the system should be
thoroughly flushed. Do this by:
1. Run the load with coolant but without RF power applied for a
period of three to five minutes.
2. Drain the circulating system as completely as possible.
3. Fill the unit with fresh, clean, distilled water.
4. Repeat the sequence as required until the drained liquid is clear.
5. Fill the unit with distilled water and/or approved ethylene glycol
mixture per the Coolant paragraph.