C437D,E GAS PRESSURE SWITCHES
68-0286 6
Completing the Installation
1. Remove the pressure gauge or manometer used for
testing. Visually recheck the piping, wiring, and setting.
2. Replace the cover glass and retainers.
3. Return the system pressure to normal.
4. Push the manual reset button (C437D,E only).
Installing a Pressure Orifice (Fig. 5)
To compensate for momentary surges in gas pressure, install a
restrictive orifice in the inlet pressure channel of the pressure
switch. (Refer to Accessories in the Specification section for
the orifice sizes available.)
Align pressure orifice into reset located inside of the main
pressure tapping at the bottom. Press orifice into place using
1/8 in. dowel rod.
Fig. 5. Installing a pressure orifice to compensate for
pressure surges.
MAIN PRESSURE
TAPPING
PRESSURE
ORIFICE
(SELECTED)
1/8 IN. DOWEL ROD
M7191A
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