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What causes a furnace limit switch to trip repeatedly

How can I prevent the glass from breaking during installation

This gasket is specifically sized at 14

UCS-621E Control Module 30067439-890 000 to 290Upgrade your systems response profile with the UCS 621E Sequencer Control Module, a solid state powerhouse designed for high precision multistage HVAC control. This veteran grade six stage sequencer functions as a direct replacement for the legacy UCS 621, offering seamless integration into existing building automation systems (BAS). Built to handle a dual 24 VAC VDC supply voltage, the module accepts a wide range 0 20 mA or 0 15 VDC input signal,