126
RT-SVX072A-EN
Figure 99. Flue gas carbon dioxide and oxygen
measurements
Test Probe
Minimum
Flue Vent
Figure 100. Ratio regulator - 2-stage and modulating
Adjustment screw (under
cap) for manifold pressure
adjustment (during Low Fire
O2 adjustment only)
Connection for
combustion
blower tubing
Tap location for load line
pressure
Connection for
combustion air
switch tubing
Figure 101. Manifold pressure tap location - 2-stage
and modulating
Tap location for manifold pressure
Figure 102. Air Damper location - 2-stage and
modulating
Ultra Modulating Gas Furnace
Ultra modulating gas heaters are available for the 500,
850 and 1000 MBh heater sizes.
Unit Control
The unit is controlled by a supply air temperature
sensor located in the supply air stream for Discharge
Temperature Control units. Zone Temperature Control
units have two sensors, one located in the supply air
stream and the zone sensor. The temperature sensor
signal is sent to the Symbio controller of the IntelliPak
unit. The control signal from the Symbio controller is 2-
10V DC. The higher the voltage signal, the higher the
call for heat.
The 2 -10V DC signal the heat output of the gas heat
controller. The greater DC voltage, the greater the call
for gas and the higher the firing rate of the heater. As
the temperature setpoint is reached, the modulating
heat controller will cause the combustion air speed to
change to a lower firing rate that matches the heat load
of the space.
NNoottee:: See figures in “Ultra Modulating Burner
Setup,” p. 127 for 500/850MBh representation.
UUnniitt SSttaarrttuupp
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