160
RT-SVX36G-EN
Unit Start Up
pressure that is sensed by the modulating gas valve. The greater the combustion air pressure, the
greater the call for gas and the higher the firing rate of the heater. As the temperature setpoint is
reached, the Modulating Heat control will cause the combustion air actuator to change the damper
position to a lower firing rate that matches the heat load of the space.
1.
Use
Table 35, p. 108
to program the following system components for operation by scrolling
through the Human Interface displays;
•
Gas Heat
–
Supply Fan (On)
–
Variable Frequency Drive (100% Output, if applicable)
–
RTM Occ/Unocc Output (Unoccupied)
–
High Fire (90%)
–
Turn the 115 volt control circuit switch 4S24 located in the heater control panel to the “On”
position.
–
Open the manual gas valve, located in the gas heat section.
2. Once the configuration for the appropriate heating system is complete, press the NEXT key
until the LCD displays the “Start test in __Sec.” screen. Press the + key to designate the delay
before the test is to start. This service test will begin after the TEST START key is pressed and
the delay designated in this step has elapsed. Press the ENTER key to confirm this choice.
3. Press the TEST START key to start the test. Remember that the delay designated in step 2 must
elapse before the system will begin to operate.
4. Once the system has started, check the appearance of the flame through the sight glass
provided on the front of the heat exchanger. In appearance, a normal flame has a clearly defined
shape, and is primarily (75%) blue in color with an orange tip.
5. Check the inlet gas pressure at the modulating gas valve. The inlet pressure should be 6" to 8"
w.c.
6. Use a carbon dioxide analyzer and measure the percentage of carbon dioxide in the flue gas.
. Take several samples to assure that an accurate
reading is obtained. If the measured carbon dioxide level is between 8.0% and 9.5%, no
adjustment is necessary. If the CO
2
is outside this range, it indicates incomplete combustion
due to inadequate air or excessive gas.
The pressure ratio and bias adjustment screws are located on top of the regulator under a sealed
plate. The actual settings can be seen through windows on each side of the regulator. Refer to the
illustration in
Note:
The burner capacity is controlled by the movement of the air damper. This has been preset
at the factory and normally does not need field adjustment. The combustion quality (air/gas)
is controlled by the settings on the regulator (the plus (+) and minus (-) indications relate
to the change in gas flow.
7.
Set the air/gas ratio to the desired value using the #1 adjustment screw until the optimum
values between (8.0 and 9.5%) are obtained (course setting).
WARNING
Rotating Components!
During installation, testing, servicing and troubleshooting of this product it may be necessary
to measure the speed of rotating components. Have a qualified or licensed service individual
who has been properly trained in handling exposed rotating components, perform these tasks.
Failure to follow all safety precautions could result in rotating components cutting and
slashing technician which could result in death or serious injury.
