VMP-IOMM-2018-2
Fulton Ltd
Page 38
OPERATION - 4
4.2.3 STEAM PRESSURE CONTROLS
Pressure controls are mounted on the side of the control box.
Pressure controls are as follows:
Controls the ON/OFF cycle of the burner, switching the burner off when the desired steam
pressure is reached and switching it on when steam pressure falls.
Allows the burner to continuously operate between limits by switching the control from high
ametolowameasrequired.Ifthepressuregoesoutsideofthelimitsthenthestandard
operating pressure switch will then operate to turn the burner on & off as required.
Operating Pressure Transducer
Replaces Operating Pressure Switch. Sends a signal to the load controller to control the
operating pressure in the boiler by modulating the burner output and turning the burner off
when max operating pressure is achieved.
High Pressure Limiter
Should the operating Pressure Switch fail, the steam pressure will raise above the pre-set limit
causing the High Pressure Limiter (set at least 0.5 barg higher than the Operating Pressure
Switch) to switch off and lock out the burner.
A High Steam Pressure Indicator will illuminate and an alarm will sound.
Should this happen, switch the Boiler OFF/ON switch to OFF and wait until the steam pressure
is discharged. Check the connection to the pressure switch, replace as required.
Figure. 18 - Pressure Control (modulating) Figure. 19 -
Operating Pressure
Transducer
High Pressure
Limiter
Operating Pressure
Switch
High Pressure
Limiter
High/Low Operating
Pressure Switch
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