Staged, Modulating, And Ultra; Modulating; Two Stage Gas Furnace - Trane IntelliPak 1 with Symbio 800 Installation, Operation And Maintenance Manual

WARNING
Explosion Hazard!
Failure to properly regulate pressure could result in a
violent explosion, which could result in death, serious
injury, or equipment or property-only-damage.
When using dry nitrogen cylinders for pressurizing
units for leak testing, always provide a pressure
regulator on the cylinder to prevent excessively high
unit pressures. Never pressurize unit above the
maximum recommended unit test pressure as
specified in applicable unit literature.
WARNING
Rotating Components!
Failure to disconnect power before servicing could
result in rotating components cutting and slashing
technician which could result in death or serious
injury.
During installation, testing, servicing and
troubleshooting of this product it may be necessary
to work with live and exposed rotating components.
Have a qualified or licensed service individual who
has been properly trained in handling exposed
rotating components, perform these tasks.

Staged, Modulating, and Ultra

Modulating

It is important to establish and maintain the appropriate air/
fuel mixture to assure that the gas furnace operates safely
and efficiently.
Since the proper manifold gas pressure for a particular
installation will vary due to the specific BTU content of the
local gas supply, adjust the burner based on carbon dioxide
and oxygen levels rather than manifold pressure alone.
The volume of air supplied by the combustion blower
determines the amount of oxygen available for combustion,
while the manifold gas pressure establishes fuel input. By
measuring the percentage of carbon dioxide produced as a
by-product of combustion, the operator can estimate the
amount of oxygen used and modify the air volume or the
gas pressure to obtain the proper air/fuel ratio.
Confirming the correct air/fuel mixture for a furnace results
in rated burner output, limited production of carbon
monoxide, and a steady flame that minimizes nuisance
shutdowns.
Note: Prior to startup, ensure the gas supply line
installation is adequate to maintain 7" w.c. for natural
gas while the furnace is operating at full capacity.

Two Stage Gas Furnace

Two-stage gas heaters are available for the 235, 350, 500,
850, and 1000 MBh heater sizes.
RT-SVX072D-EN
Modulating Gas Furnace
Modulating gas heaters are available for the 500, 850, and
1000 MBh heater sizes.
Unit Control
The unit is controlled by at 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 0 – 10V DC for modulating
gas heat. The higher the voltage signal, the higher the call
for heat. For two stage heat, a relay is energized per stage
of heat requested.
The gas heat controller manages the speed of the
combustion blower. The greater the combustion air speed,
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.
Two-Stage and Modulating Burner Setup
Important: : It is necessary to measure gas pressure at the
following points listed below. Install the
necessary fittings prior to starting the burner in
the Manual Override.
• Inlet pressure
• Manifold pressure (see
Important: The flue reading should be taken from center of
the flue and at least 4 inches down from the
outlet. See Figure 102, p. 122
Program the following system components for operation by
scrolling through the User interface displays:
1. Gas Heat
a. Open the manual gas valve, located in the gas heat
section.
b. Set toggle switch located on heater control box to
ON.
c. Press Stop button on User interface.
d. Navigate to the Gas Heat Manual override screen.
See Figure 101, p. 121
106, p. 124 for modulating. Set the modulating
percentage to 1% and/or enable the 1
Touch the Auto button in the top right corner of the
screen.
e. Turn the Supply Fan ON by the navigating to the
Manual Override Screen. Set the Fan speed to
100%.
2. Low Fire O2 Adjustment: After the initial purge
sequence and once the burner has started, run the
burner at low fire for 10 minutes to allow the burner to
stabilize.
Unit Start-up
Figure 104, p. 122)
.
for two–stage and Figure
st
stage.
119