HARVEY Chemiclave EC5500, Service Manual, Page: 45 / 56

45
M
AINTENANCE AND
S
ERVICING
Figure 27: Pressure Switch
Figure 28: Sterilant Level Switch
Pressure Switch
The pressure switch is set to close at 20 psi (138 kPa). If
it does not, adjust it.
1. Unplug unit from power switch and remove top
cover.
2. Follow steps 1-4 under “Piping Component.”
3. Open pressure relief valve to obtain a pres-
sure of 20 psi (138 kPa).
4. Connect an ohmmeter to the pressure switch
terminals (see Figure 27).
5. Turn adjusting knob of the pressure switch
until its microswitch closes. (The ohmmeter
will read, “O.”) NOTE: Clockwise increases
pressure, counterclockwise decreases pres-
sure.
6. Depressurize the chamber.
7. Reconnect exhaust tube and reinstall reser-
voir.
8. Replace top cover.
Sterilant Level Switch
The float on the sterilant level switch can stick, interfering
with the function of the VAPO indicator.
Testing Sterilant Level & Switch
Replacement
1. Unplug unit from power source.
2. Remove top cover.
3. Remove the level switch from the reservoir,
4. Disconnect the wire leads from Display/
Control PCB.
5. Check the float for free movement and correct
function. When the float is down (Against “C”
cup) there should be continuity. If not, replace.
6. Reinstall level switch and connect wire leads
to display/timer PC board.
7. Replace top cover.
Note
Be sure unit is cool and at room
temperature.
Adjustment
Knob
Connect
Voltmeter
Here