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RT-SVX073A-EN
Table 62. Chart A - Manual override mode setup
parameters
Modulating Gas
Heat Actuator
(Service Mode)
Low Fire
(1%)
Mid Fire
(38%) (see
note)
High Fire
(100%)
VDC Signal to actuator
See Table
64, p. 163
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 - NG
6.0” 6.0” 6.0"
Load Line Pressure -
NG
2.0”
Manifold Pressure -
NG
0.8" to 0.9” See chart B
Main Gas Regulator
Pressure - LP
10.0” 10.0” 10.0”
Load Line Pressure -
LP
0.9”
Manifold Pressure - LP 0.12” to 0.17” See chart B
Note: In the manual override mode, adjust the % output until the Load
Line Pressure is correct, then verify/ adjust manifold pressure.
Table 63. Chart B - high fire manifold pressure
Burner size
High Fire Manifold Pressure
NG LP
850 MBh 1.6" to 1.9" 0.68" to 0.72"
1100 MBh 2.4 to 2.8" 0.92" to 0.96"
1800 MBh 3.2 to 3.6" n/a
2500 MBh 3.3 to 3.7" n/a
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 106. Gas Heat Manual Override screen — 2–
stage
Figure 107. Gas Heat Manual Override screen -
modulating
Figure 108. Ratio regulator
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
Unit Startup
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