31
Part No. 6-847703-00 Rev. C00
Operation
Reserve Header Master Valve Multi-turn high
pressure valve allows flow from high-pressure
cylinders to be shut off. Master valve uses
metallic seating surfaces. Master valve should
always be turned to fully open, maximum
counterclockwise position.
Reserve Header High-Pressure Regulator A
single stage, diaphragm type regulator. Used to
reduce incoming cylinder pressure to 70 PSI (200
PSI for some models). Two gauges are mounted
on regulator body. 3000 PSI gauge reads high-
pressure cylinder contents pressure, 300 PSI
gauge reads regulator outlet pressure.
Reserve Low Pressure Switch An adjustable,
single pole, normally open pressure switch.
Monitors contents pressure of high-pressure
cylinders connected to reserve header. When
adequate pressure is applied, switch contacts are
held closed. When cylinder contents pressure
drops to switch setting of 1500 PSI (400 PSI for
some models), switch contacts will open.
Activation of switch indicates that contents of
high-pressure cylinders has been partially
depleted either by use or leakage.
Front Panel Indicators Six front panel indicators
monitor status of manifold. Indicators are 24 VDC
LED (Light Emitting Diode) type.
Control Board An electronic circuit board that
controls manifold switchover. Control board
monitors pressure switches and controls solenoid
valve in order to initiate manifold switchover.
Control board illuminates appropriate front panel
indicators and provides dry contacts for activation
of external master alarms. Power to control board
is provided by external power supply.
Power Supply (Not Shown) An external NEMA
3R rated enclosure contains a 120 VAC to 24 VAC
transformer. 24 VAC is routed to manifold control
board via a detachable six-conductor cable and
connector. An in-line 0.25 amp slow-blow fuse is
provided in 120 VAC power line (0.125 amp for
240 VAC models). Terminal blocks inside power
supply allow for connection of AC input power,
reserve low switch input and master alarm panel
normally closed dry contact outputs. Refer to
Figure 14 for power supply wiring.
