95
Rev 2.1
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
x
is less
than 15 ppm at 90% firing rate. Adjust c
ounter-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.
Throttle Screw
Pressure Regulator
Screw
Summary of Contents for A050-A300
Page 28: ...28 Rev 2 1 ...
Page 31: ...31 Rev 2 1 Figure 2 10 One Atlas One Tank Suggest Piping Diagram ...
Page 32: ...32 Rev 2 1 Figure 2 11 One Atlas Two Tank Piping Diagram ...
Page 33: ...33 Rev 2 1 Figure 2 12 Two Atlas One Tank Piping Diagram ...
Page 34: ...34 Rev 2 1 Figure 2 13 Two Atlas Two Tank Piping Diagram ...
Page 36: ...36 Rev 2 1 Figure 2 15 Two Atlas in Primary Secondary Loop Piping Diagram ...
Page 113: ...113 Rev 2 1 ...
