Trane IntelliPak 1 with Symbio 800 Installation, Operation And Maintenance Manual page 43

Table 19. Natural gas – ultra modulating gas heat settings
Heater Size
500 MBH
800 MBH (c)
850 MBH (c)
1000 MBh
(a) Number of counterclockwise (CCW) turns for ratio regulator is counted from starting position of all the way in.
(b) FHi and FLo Fan speed is adjustable by calling Technical Support. The default speed keeps the fan furnace from over-firing. FLo is 10% for EBM and 15% for Fasco.
(c) For Horizontal MBH, refer to gas heat rating plate for actual capacity.
Table 20. LP gas – ultra modulating gas heat settings
Heater Size
500 MBH
800 MBH (c)
850 MBH (c)
1000 MBH
(a) Number of counterclockwise (CCW) turns for ratio regulator is counted from starting position of all the way in.
(b) FHi and FLo Fan speed is adjustable by calling Technical Support. The default speed keeps the fan furnace from over-firing. FLo is 10% for EBM and 15% for Fasco.
(c) For Horizontal MBH, refer to gas heat rating plate for actual capacity.
Note: The FHi fan speed setting on the SCEBM is set to
the default Natural Gas settings. Fan speed is
adjustable by calling Technical Support.
Figure 23. Two-stage and Mod gas train for 235 to 500
MBh
Ratio regulator
Manual shut-off valve
To combustion
air sensor
Main gas
solenoid
valves
Manual shut-off
vavle with 3/4" field
connection
RT-SVX072D-EN
Natural Gas
VDC Signal
High Fire
10
10
10
10
Propane
VDC Signal
High Fire
10
10
10
10
High gas switch
Low gas
switch
Ratio Regulator
Turns (a)
Low Fire
2 10 – 12 CCW
2 10 – 12 CCW
2 10 – 12 CCW
2 10 – 12 CCW
Ratio Regulator
Turns (a)
Low Fire
2 10 – 12 CCW
10 – 12 CCW
2
2 10 – 12 CCW
2 10 – 12 CCW
Figure 24. Two-stage and Mod gas train for 850 MBh
Ratio regulator
Manual shut-off valve
To combustion
air sensor
Main gas
solenoid
valves
Manual shut-off
vavle with 1" field
connection
Installation
FHi Fan Speed (b)
EBM Fasco
41% 41%
48% 47%
50% 49%
72% 55%
FHi Fan Speed (b)
EBM Fasco
34% TBD
46% TBD
48% TBD
61% TBD
High gas switch
Low gas
switch
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