Trane IntelliPak with Symbio 800 Installation, Operation And Maintenance Manual page 46

Installation
Figure 27. Unit gas trains 250/350 MBh 2 stage/
modulating
Modulating valve
(not on 2-stage)
One stage valve on
Modulating, two stage
valve on 2-stage
Manual shutoff
valve
1" field
connection elbow
46
Figure 28. Unit gas trains 250/350 MBh ultra
modulating and 500 MBh 2 stage/modulating
Modulating valve
(not on 2-stage)
One stage
valves
1" field
connection elbow
Manual shutoff
valve
RT-SVX063G-EN