Installation, Operation & Maintenance Manual
IM-895
12
Check, Test & Start-Up Procedure
(cont.)
If the actual measured pressure is within (+/-) 0.50" w.c. of the calculated burner pressure above, adjust the gas valve regulator
until the measured pressure matches the calculated pressure.
If the actual measured pressure is greater than 0.50" w.c. from the calculated burner pressure above, check the inlet gas
pressure to the unit. Adjust the main gas valve regulator to the correct inlet pressure within the range indicated on the unit
rating plate. Once corrected, repeat step #13 to measure the burner pressure.
e. With the high fire manifold pressure set to match the setting on the unit serial plate, observe the flame while in high fire.
The flame should be stable and burning clean. The flame should be predominantly blue, although a slight orange tip may be
present and is acceptable.
f. After the high fire pressure is correctly set, check the low fire burner flame. Install the wires removed in “d” above. Low
fire can be achieved by removing CR12 from its relay base.
g. Recycle the ignition sequence to make sure the burner lights smoothly and the flame is present across the entire length of
the burner.
14. With the unit off, close the main gas manual hand valve. If applicable, remove the "U" tube manometer and replace the 1/8"
pipe plug test port at the burner.
15. Test the gas seal of the safety shut-off valve(s) with the following steps:
a. While the unit is off, close the main gas hand valve and attach a pressure gauge to the downstream side of the last safety
shut-off valve (SSOV) closest to burner.
b. Open the main gas hand valve and following the startup procedure described in this manual, turn the unit on and allow the
burner to go to main flame.
c. Shut the unit off and let the pressure drop to zero.
d. Close the manual gas hand valve closest to the burner and wait 5 minutes. The main gas manual hand valve should remain
open.
e. There should be no changes in pressure. If the pressure increases, the second SSOV needs to be replaced.
f. Open the main gas manual hand valve.
Commissioning
After all the initial start-up procedures have been performed, the unit is ready for commissioning. Check the unit operation in
all modes against the General Sequence of Operation on the following pages or refer to the job specific sequence of operation
included with the unit as shipped.