Maintenance and Troubleshooting
4–6
M/C 4200 The pressure switch is factory set and should not need adjustment.
However, if the switch should be out of adjustment the switch can be reset
as follows:
TOOLS REQUIRED
• 0 to 50 psia pressure meter accurate to ±0.05 psia. (Must be an absolute
pressure meter.) Refer to Appendix B in the Sterilizer Service Manual.
• 120VAC volt meter or test lamp.
SHOCK HAZARD: AC line voltage is present on the pressure
switch terminals. Turn OFF power to the sterilizer when
connecting the test lamp and adjusting the pressure switch.
PROCEDURE
1. Connect the pressure meter to the pressure meter
connection on the sterilizer control box.
Air should be used to pressurize the chamber when
making the pressure switch adjustment.
2. Raise the sterilizer control bezel and open the control box.
Switch the controls switch on the control p.c. board from
AUTO to MANual. Using the necessary dip switch,
pressurize the sterilizer chamber to 2 psi above
atmospheric.
3. Connect the voltmeter or the test lamp between the
common (C) and the normally closed (NC) terminals on the
water-saver pressure switch.
Figure 4–2. PRESSURE SWITCH ADJUSTMENT (MP-129 C&D)
4. Using the adjustment wheel on the pressure switch (see
Figure 4–2), adjust the wheel so the voltmeter reads no
continuity (or the test lamp goes OFF) when the pressure
gauge reads 2 psi above atmospheric.
WARNING
ADJUSTMENT
WHEEL
2 x 2 x4
OUTLET BOX
350545-L
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