Figure 1-2 Timing Coil For Pressure Switch - Siemens Maxum II PD PA AP Service Manual

The air pressure switch is connected to the oven air flow using an extension that runs parallel
to the oven air flow line. This extension line is equipped with a restrictor coil. The coil is
necessary in order to create a short delay between the start of air flow and the activation of
the pressure switch. This delay forces the oven heater to purge for a short time before the
heater is powered up. See the photo below.
Figure 1-2
Maxum II Valves and Oven Components
Service Manual, 10/2018, A5E42019844001
1.1 Isothermal Air Bath Oven Heater System (Single and Split)
Timing Coil for Pressure Switch
Oven Types
9