![background image](http://html1.mh-extra.com/html/hamworthy/dorchester-dr-sg-20-210/dorchester-dr-sg-20-210_installation-commissioning-and-servicing-instructions_3490087033.webp)
4.8.1. Change from G20 to G31
Refer to section 4.8.1.3 for instructions on how to implement the settings changes as the
last step of this process
4.8.1.1.
Installing the propane injector Dorchester DR-SG XX-210 models
IMPORTANT:
ONLY on 20 to 30kW storage tanks
AA031256 - DR-SG 20-210, AA031257 - DR-SG 25-210, AA031258 - DR-
SG 30-210
IMPORTANT:
Complete the modification before connecting the gas line
Change the type of gas by installing an injector at the gas valve outlet.
Remove the fixing clip (4) downstream of the valve.
Remove the versilic tubes from the air hose.
Unscrew the air hose collars and remove it.
Unscrew the fan screws (6).
Remove the fan + venturi sub-assembly.
Position the injector (7) in the valve (see figure).
Replace the gas valve O-ring (3) with the additional supplied seal.
Replace the fan seal (5)
Install the assembly.
4.8.1.2.
Installing the propane injector Dorchester DR-SG XX-538 models
figure 8 - installing the propane injector
IMPORTANT:
Always replace seals after disassembly.
IMPERATIVELY check the different seals after assembly.
5.5Nm
13.01.2023
Page 33 / 104
DORCHESTER DR-SG -
Installation, Operation and Maintenance