6-4.6 Blocked Drain Test - (Optional); Startup Component Adjustments; 6-5.1 Firing Rate Check/Fuel Air Ratio Gas Valve - Ace Heating Solutions Atlas A050 Operating And Maintenance Manual

6-4.6 Blocked Drain Test - (Optional)

The blocked drain safety feature checks to make sure the drain does not have any blockage by ensuring the water level
from the condensate does not exceed a specific level. This check is not necessary, but is recommended. To check if the
safety device is operating properly:
1) Close off the end of the condensate pipe with a ½" ball valve.
2) Turn on the unit, and set the setpoint below 120 degrees.
3) When the water level becomes too high, a hold code of 63 will appear on the control panel screen.
4) When the hold code does appear, open the ball valve on the end of the condensate drain and press the blocked
drain reset located on the top right on the outside of the control box.

6-5 Startup Component Adjustments

6-5.1 Firing Rate Check/Fuel Air Ratio Gas Valve ADJUSTMENT
All Atlas Series Condensing Boilers have been factory
fire tested and tuned to operate at sea-level standard
conditions with up to 60 ft of equivalent exhaust venting.
Installations with a standard heating value fuel and at elevations
below 2,000 feet will generally only require adjustment of the
fuel-air ratio valve and air flow switch to correct firing rate at
appropriate fuel-air ratios. These adjustments should be done for
each fuel valve on combination fuel units.
Procedure for Atlas A Series High Efficiency
Boiler equipped with Basic Panel
To adjust fuel air ratio valve at high-fire (90%):
1. Turn off unit by setting the burner cutoff switch to the
off position.
2. Remove the plastic cover over the Throttle screw.
3. Using the Basic Panel, activate boiler demand temporally adjusting setpoint (about 40F) above normal operating
setpoint.
4. Set the burner cutoff switch to ON position to start the unit.
5. Wait for the boiler to cycle on. Run icon will be displayed on the Basic Panel.
6. Enter Diagnostic Mode by pressing Next button on the Basic Panel for 3 seconds. Once in Diagnostic Mode and
press Next button until Max icon is flashing and Diag icon is
solid. Unit will now be running at 90% firing rate.
7. Using the combustion analyzer, adjust the Throttle screw to achieve
30%- 45% excess air, CO is less than 100 ppm, and NO
than 15 ppm at 90% firing rate. Adjust counter-clockwise for more gas and
clockwise for less gas. Make sure boiler is in manual firing mode throughout the
adjustment period. In manual firing mode, firing rate value display is alternated
with Outlet/DHW temperature display.
8. Press the Done button on the Basic Panel to exit the manual firing mode.
9. Readjust setpoint to normal operating setpoint.
10. Replace the plastic cover over the Throttle screw.
To adjust fuel air ratio valve at low-fire (10%):
1. Turn off unit by setting the burner cutoff switch to the OFF position.
2. Remove aluminum protection screw on the pressure regulator.
3. Using the Basic Panel, activate boiler demand by temporally adjusting setpoint (about 40F) above normal
operating setpoint.
4. Set the burner cutoff switch to ON position to start the unit.
5. Wait for the boiler to cycle on. Run icon will be displayed on the Basic Panel.
is less
x
95
Throttle Screw
Pressure Regulator
Screw
Rev 2.1