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Changing water pumps and motors
The chiller has two water pumps and associated motors. When
you get no water flow (R-AXIS will shut down) or get temperatures above
what you set, they might be damaged. To change them, first drain the water
in the tank and then lift the top cover and take off front panel. Dismount
the pump and the motor together (remember to mark the
hoses and wires before dismounting them!!). There are three screws
fixing them together and between (inside) them is a brass coupling. If the
coupling is completely worn out, you have either or both of them bad. Usually,
the pump is for sure bad. If you can still turn the shaft of the motor easily
with your bare fingures, the motor is probably still okay. You can actually
reconnect the motor to the chiller and turn on the power for a couple of
second without the pump. If the motor still rotates, it's okay and you need
to change the pump only.
You may wonder before doing all this which pump/motor set is bad. Touch
a pump with the tip of a screw driver and put your ear on the other end
of the screw driver, and you should be able to tell. If the coupling is
bad inside, you can tell by looking at a small hole on the motor (three
of them about 2mm in diameter and near the pump end). You should see black
metal powders if the coupling is worn out while it should be absolutely
clean otherwise.
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