RT-SVX36G-EN 157
Unit Start Up
– Variable Frequency Drive (100% Output, if applicable)
– RTM Occ/Unocc Output (Unoccupied)
– Heat Stages 1 & 2 (On)
– 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 manifold gas pressure by using the manifold pressure port on the gas valve. Refer
to Tabl e 52 for the required manifold pressure for high-fire operation. If it needs adjusting,
remove the cap covering the high-fire adjustment screw on the gas valve. Refer to Figure 84 for
the adjustment screw location. Turn the screw clockwise to increase the gas pressure or
counterclockwise to decrease the gas pressure.
6. Use a carbon dioxide analyzer and measure the percentage of carbon dioxide in the flue gas.
Refer to the illustration in Figure 83. Take several samples to assure that an accurate reading
is obtained. Refer to Tab le 5 2 for the proper carbon dioxide levels. A carbon dioxide level
exceeding the listed range indicates incomplete combustion due to inadequate air or excessive
gas.
Combustion Air Adjustment (O
2
)
7. Use an oxygen analyzer and measure the percentage of oxygen in the flue gas. Take several
samples to assure an accurate reading. Compare the measured oxygen level to the combustion
curve in Figure 84, p. 159. The oxygen content of the flue gas should be 4% to 5%. If the oxygen
level is outside this range, adjust the combustion air damper to increase or decrease the
amount of air entering the combustion chamber. Refer to Figure 87, p. 162 for the location of the
combustion air damper.
8. Recheck the oxygen and carbon dioxide levels after each adjustment. After completing the high-
fire checkout and adjustment procedure, the low-fire setting may require adjusting.
Low-Fire Adjustment (500 MBH, 850 & 1,000 MBH only)
1. Use the TEST initiation procedures outlined in the previous section to operate the furnace in
the low-fire state (1st Stage).
2. Use a carbon dioxide analyzer and measure the percentage of carbon dioxide in the flue gas.
Refer to the illustration in Figure 83, p. 158. Take several samples to assure that an accurate
reading is obtained. Refer to Figure 84, p. 159 for the proper carbon dioxide levels. If the
measured carbon dioxide level is within the listed values, no adjustment is necessary. A carbon
dioxide level exceeding the listed range indicates incomplete combustion due to inadequate air
or excessive gas.
3. Check the manifold gas pressure by using the manifold pressure port on the gas valve. Refer
to Figure 84 for the required manifold pressure during low-fire operation. If it needs adjusting,
remove the cap covering the low-fire adjustment screw on the gas valve. Refer to Figure 84 for
the adjustment screw location. Turn the screw clockwise to increase the gas pressure or
counterclockwise to decrease the gas pressure.
Note: Do not adjust the combustion air damper while the furnace is operating at low-fire.
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