Parr Instrument 4857 - Manual (Page 31)

4857 Reactor Controllers
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C
LEANING AND
M
AINTENANCE
Periodic cleaning may be performed on the exterior surfaces of the controller with a lightly dampened
cloth containing mild soap solution. All power should be disconnected and the power cord should be
unplugged when cleaning the controller.
There are no user serviceable parts inside the product other than what is specifically called out in this
manual. Advanced troubleshooting instructions beyond the scope of this manual can be obtained by
calling Parr Instrument Company in order to determine which part(s) may be replaced or serviced.
Fuses
Description Parr No. Type Ratings
For 4857
Instruments fuse 139E24 Fast-Acting 3 Amp, 250VAC
For 4875
Heater fuse 139E23 Fast-Acting 15 Amp, 250 VAC
Cooling fuse 139E10 Fast-Acting .25 Amp, 250 VAC
For 230 VAC model:
Fuse (A+) on motor control circuit board 959E5 Very Fast-Acting 8 Amp, 250VAC
Fuse (L) on motor control circuit board 185E2 Fast-Acting 10 Amp, 250VAC
Access to the Controller Cabinet
To open the controller cabinet, turn off the power switch, unplug the power cord and locate the four
screws on the upper half of the chassis, and the eight screws on the lower half of the chassis. The
four screws on the upper half should be removed first, and then the four screws on the upper row on
the lower half of the chassis should be removed. Then lift the top panel away.
WARNING:
The inside of the controller cabinet should be accessed by qualified personnel only
.
Diagram 3: 4857 Process Controller
Side View showing screws
Remove these screws
(total of 8)