Potter Releasing Systems - Manual (Page 20)

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This is the same type of system except this one uses a pressure switch with a built-in retard instead of installing
the pressure switch on top of the retard chamber. In this case, the retard chamber is only being used to delay the
water motor gong. If there is no water motor gong, the retard chamber can be eliminated.
The retard time will start when the pressure at the WFSR-F reaches 6 psi. The pressure must remain there for
the length of time the retard is set in order for the device to trip.
Pressure type flow switches can be installed without disabling the sprinkler system. Since they are installed on
the alarm port, there is no pressure or water present under normal conditions. The sprinkler system does not
have to be drained, they can be installed without shutting off the water supply. Therefore, the sprinkler system is
never out of service.
A pressure switch with a built-in retard allows the system to remain operational at all times, and eliminates the
maintenance required on the retard chamber. An automatic drain is still required to relieve the pressure on the line.