Aftercooler Water Supply: Check to make sure that water is flowing to the
aftercooler. Make sure the valve is open and clean the strainer at least twice a
year. To clean the strainer, shut off the water valve, and remove the strainer nut
at the bottom of the strainer. Remove the strainer and clean it of debris and any
corrosion. Replace the strainer and tighten the nut.
STRAINER MAINTENANCE
REMOVE AND CLEAN STRAINER
Magnetic Heater Contactors: The heater contactors should be checked on a
monthly basis to ensure proper operation. Typically there are two Heater
contactors, although some high heat models may have three or four. There are
two ways to check a contactor. In either case, you will need a Multi-Meter to
properly check operation.
VOLTAGE CHECK:
Electrical maintenance should only be performed by individuals with
proper electrical knowledge and training
The first check, the voltage check, can be done with the machine running.
Always use extreme caution when working on and around the high voltage
inside the electrical cabinet.
1) Set the Multi-meter to the proper AC voltage setting that corresponds to
the voltage rating of your machine.
2) Confirm that the proper voltage is being supplied to the “line” side of the
contactor by checking the “line” side leads horizontally, between each pair
of “line “ leads, (L1&L2, L1&L3 and L2&L3). This voltage should be the
same as the plant voltage. (See fig. 1)
3) Next, repeat this process on the “load” side leads of the contactor. Keep
in mind you will only get a voltage reading when the contactor is active,
(contacts pulled in). The voltage should be the same across the “load”
side (T1&T2, T1&T3 and T2&T3) as it is on the “line” side. (See fig 2) If
one or more of the leads has substantially lower or no voltage, this is
indicative of a defective contactor. Be sure to shut off the power at the
breaker or buildings disconnect before replacing the contactor.
7
To Next Page
