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RT-SVX072A-EN
Table 57. Chart A - ultra modulating service mode
setup parameters
Modulating Gas
Heat Actuator
(Service Mode)
Low Fire
(1%)
Mid Fire
(38%)
(see
note)
High Fire
(100%)
VDC Signal to
actuator
2.0 VDC 5.0 VDC 10.0 VDC
Inlet Pressure
7.0" to
14.0”
7.0" to
14.0”
7.0" to
14.0"
Main Gas Regulator
Pressure
6.0” 6.0” 6.0"
Load Line Pressure 2.0”
Manifold Pressure 0.8" to 0.9” See chart B
Note: In the service mode, adjust the % output until the Load
Line Pressure is 2.0", then verify/ adjust manifold
pressure.
Table 58. Chart B - high fire manifold pressure
Burner size
High Fire Manifold Pressure
500 MBh 2.6" to 2.9"
850 MBh 1.6" to 1.9"
1000 MBh 2.1" to 2.4"
Note: If the manifold pressure is not within the range shown on
the chart, then the maximum combustion fan speed (Fhi)
needs adjustment. Contact Large Commercial Technical
Support for assistance.
Figure 103. Gas Heat Manual Override screen -
modulating
Figure 104. Radio regulator — ultra modulating
Low fire bypass
Adjustment screw (under cap) for
manifold pressure adjustment during
low-fire and mid-fire pressure
adjustment only
Tap location for
load line pressure
Connection for
combustion air line
Figure 105. Main gas regulator and inlet pressure tap
locations
Tap location for
inlet pressure
Tap location for outlet
pressure from main gas regulator
Main gas regulator
Pilot gas
regulator
UUnniitt SSttaarrttuupp
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