Roberts Gorden HF 30 v4 Installation, Commissioning, Service & User Instructions page 23

CABINET HEATER
Models 015 to 030 - all types of valve
Automatic
gas valve &
regulator
TP1
GAS
INLET
1 = START GAS
2 = MAIN GAS
Fig 2.5 Gas Train Circuit for All Models with Dungs Gas Valves
Fig 2.6 Dungs Main Gas Valve Details for All Models
TO BURNER
Automatic
gas valve
TP3
TP2
Note orifice plate
fitted into union
between valve and
burner where required
TP1 = Inlet Pressure
TP2 = Pressure between main gas valves
TP3 = Valve outlet pressure
Burner pressure TP on burner
Models 040 to 0100 - all types of valve
Regulator
TP2
TP1
GAS
INLET
Automatic
gas valve &
regulator
Automatic
TO BURNER
Burner
gas valves
flange
Union
TP3
Automatic
Note orifice fitted into
gas valve
union between valve
and burner for models
40/50, and burner
flange for models 60
and over.