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Unit Startup
Remember that the delay designated in step 6 must
elapse before the fan will begin to operate.
8. Once the system has started, verify that the electric
heat or the hydronic heat system is operating properly
by using appropriate service technics; i.e. amperage
readings, delta tees, etc.
9. Press the STOP key at the User Interface Module in the
unit control panel to stop the system operation.
Gas Furnace Start-Up
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.
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.
WARNING
Hazardous Gases and Flammable
Vapors!
Failure to observe the following instructions could
result in exposure to hazardous gases, fuel
substances, or substances from incomplete
combustion, which could result in death or serious
injury. The state of California has determined that
these substances may cause cancer, birth defects, or
other reproductive harm.
Improper installation, adjustment, alteration, service
or use of this product could cause flammable
mixtures or lead to excessive carbon monoxide. To
avoid hazardous gases and flammable vapors follow
proper installation and setup of this product and all
warnings as provided in this manual.
160
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.
2-stage and Modulating Gas Furnace
2–stage and modulating gas heaters are available for all
heater sizes - 850, 1100, 1800, and 2500 MBh.
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 for modulating gas
heat.
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. For 2-stage
heat, the control signal will have a mid range voltage (4 -
5V DC) for stage one and 10V DC for stage two.
RT-SVX073A-EN
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