44
RT-SVX072A-EN
Table 18. LP gas – 2-stage and modulating gas heat settings (continued)
Propane
850 MBH Mod
0 1150 1150 10 3920 2.5 5 0.516
1000 MBH 2-stg n/a 2600 2600 10 4430 2 5 0.516
1000 MBH Mod 0 1150 1150 10 4430 2 5 0.516
Note: P0, P1, and P2 are fan speed settings in the Seimens controller. The default speeds have been preset at the factory and normally do not
need field adjustment.
(a)
binary input for 2-stage
(b)
800MBH is Horizontal Discharge. MBH is listed on gas heat rating plate.
Figure 20. 2-stage and Mod gas train for 235 to 500
MBh
High gas switch
Ratio regulator
Manual shut-off valve
To combustion
air sensor
Main gas
solenoid
valves
Manual shut-off
vavle with 3/4” field
connection
Low gas
switch
Figure 21. 2-stage and Mod gas train for 850 MBh
High gas switch
Ratio regulator
Manual shut-off valve
To combustion
air sensor
Main gas
solenoid
valves
Manual shut-off
vavle with 1” field
connection
Low gas
switch
Figure 22. 2-stage and Mod gas train for 1000 MBh
High gas switch
Ratio regulator
Manual shut-off valve
To combustion
air sensor
Main gas
solenoid
valves
Manual shut-off
vavle with 1” field
connection
Low gas
switch
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