Roberts Gorden Tubular Unit Heaters 300 - Manual (Page 26)

COMBAT ® UHA U NIT H EATER I NSTALLATION O PERATION AND S ERVICE M ANUAL
20
Figure 10: Automatic Burner Control Sequence
Figure 11: Gas Valve for Models UHA[S] 150 - 400
If at any stage the flame fails, the control will retry
for ignition. The control has four trials for ignition
before a one hour lockout.
½PSI
IN
C
ON
OFF
Regulator
Outlet
Pressure
Gas Inlet
Inlet Pressure
Top View
End View
Description Part Number
Gas Valve 150 - 225 NG 90032505
Gas Valve 150 - 225 LP 90032506
Gas Valve 250 - 400 NG 90032520
Gas Valve 250 - 400 LP 90032521