GAS SOLENOID VALVES
Model SIT 840 (single stage)
31
Model SIT 843 (two stage)
PM
Main inlet pressure test point
PV
Head pressure test point
RP
Pressure adjusting screws
RP1
Cross cut screw low fire adjuster
RP2
Hexagonal screw high fire adjuster
GAS CONVERSION
The heaters are supplied ready for use with (G20) Natural Gas set as per the table below. Conversion kits are available
from the manufacturer
Natural Gas H (G20)
TYPE
1 2 3 4 5 6 7
Number
of
injectors
1 1 1 1 2 2 4 N°
Diameter
of
injector
310 410 480 555 500 540 450
mm/100
Gas supply pressure
20
mBar
Head pressure high fire
12,0
13,0 13,0 13,0 10,0 13,0 10,5 mBar
Head pressure low fire
(two stage–dual
power)
6,0 7,0 6,5 6,5 7,0 6,5 5,0 mBar
BEFORE CHANGING INJECTORS ENSURE GAS SUPPLY IS ISOLATED
To convert to Propane G31
1.
Change injectors
2.
Adjust the inlet gas pressure
3.
Adjust the head pressure gas
4.
Fit primary air diaphragm (if required)
5.
Fit adhesive label indicating gas type
6.
Ensure settings are correct as per manual.
