Bird Technologies 8630B Series - Manual (Page 42)

Bird 8630B Series Moduload RF Load Resistor
26
Water Flow Switch To replace the safety control water flow switch, begin with the same
process as described in the RF Resistor Load Disassembly section.
Remove the flow switch carefully or damage to the connections and
fittings may result.
1. With the top cover removed, and the unit drained of coolant,
loosen the clamp bands on the hose connections going to the load
water chamber output and the flow switch input. Remove the
hoses and move them out of the way.
2. Series 8630 only. Remove the 18, 8-32 x 1/4" Phillips head screws
in the perimeter of the pan panel assembly. Pull this panel out
sufficiently towards the rear of the unit to gain access. Usually
connection wires will not have to be disconnected.
3. Disconnect the wires that lead to the flow switch. On the 8630
series, one wire is connected to the thermoswitch located under the
coolant reservoir tank. The other wire is disconnected at a
connector in the wire harness.
4. On the 8630 series, unscrew the input elbow to the flow switch,
counterclockwise. The flow switch can be easily unscrewed
counterclockwise, depending on the orientation of the output elbow
on the load.s water chamber. This elbow may have to be turned or
possibly removed to allow the flow switch to swing freely when
being unsrewed
On the 8630B series, unscrew the input elbow to the flow switch
(counterclockwise).
Note: If the fan interferes when removing the elbow, loosen the set
screw on the water chamber then rotate the water chamber until
the elbow is free from interference.
5. The flow switch is now free for repair or replacement.
6. Replace the flow switch and assemble the unit by reversing the
disassembly directions given above. When replacing the flow
switch on threaded fittings, coat only the external threads
sparingly with an acceptable pipe sealant compound. Coating only
the external threads reduces the chances of contaminating the
coolant.
Time Delay Relay The time delay relay is non-adjustable and is set for a 2 second delay.
The relay contacts can be used to interrupt the transmiter circuit in
the event of inadequate coolant flow or over temperature. The relay is
located on the upper left inside of the front panel.
The relay is not serviceable. To remove the realy perform the
following steps.