Munters R Series, Operating And Maintenance Manual

Page: 53 / 141

Manual# I27028 6-16 Rev. 2 – 11/22/2017
Figure 6-6
AIR WINGS
10. Adjust the burner gas pressure regulator such that when the gas butterfly valve is in
its maximum open position (gas heat cv of 100% from the PLC) that the difference
in pressure between ports C and B is at the "Full Rate Manifold Pressure" as stated
on the Munters rating plate.
The differential pressure switch is set at the factory, and monitors the gas pressure
in the gas manifold. This switch limits the minimum firing rate of the burner and
should not be field adjusted.
11. If the pressure difference between C and B is higher than the value listed on the
rating plate, reduce the gas supply pressure to the butterfly valve by adjusting the
gas regulator. If the pressure is less than the number on the rating plate, increase
the gas supply pressure to the butterfly valve. To adjust the "Full Rate Manifold
Pressure," use the regulator supplied with the Munters equipment gas train, not the
supply pressure regulator that is part of the site's gas utilities.
12. Recheck for gas leaks at the end of the test using a bubble test with a non-corrosive
soapy solution. If leaks are found, isolate the main gas supply from the equipment
and correct the leaks.
13. Verify that when the power is removed from the "call for heat" terminal on the
ignition module, the main and pilot gas valves close, and the main and pilot flames
extinguish.
14. If this procedure does not result in a properly operating burner, or the maximum
firing rate cannot be achieved, consult the factory.