KAH Operation & Maintenance Guide
Page: 25 of 88
Krueger | 1401 N Plano Rd | Richardson, TX 75081 | 972.680.9136 | [email protected] | www.krueger-hvac.com
SECTION 2 - START-UP & OPERATION (CONTINUED)
Starting the Burner
1. Prior to starting the burner, the technician must verify
the incoming gas pressure. A minimum pressure
is listed on the burner test report. The maximum
pressure is listed as well.
2. Open the manual gas valves on gas supply and pilot
line.
3. Initiate a call for heat or use jumper to create a call for
heat.
4. Turn the burner panel on/off switch to on.
5. Once there is a call for heat, a 30-second pre-purge
period is initiated to remove any gases from the heat
exchanger. The burner will go through a second
purge before ignition.
6. The burner will automatically go to low fire at start-
up. After proof of low fire, the burner will modulate
up to high fire, which may take 15 seconds for a
Powerflame burner, and 90-180 seconds for the
Eclipse burner. After the burner operates at High Fire
use the manometer connected to the Heat Exchanger
Draft Port as shown in Figure 31 on page 37, observe
the reading. A pressure of -0.03” WC is expected for
draft overfire. Readings may differ slightly from those
shown on the Burner Test Report.
7. For valid readings before making any adjustments,
allow the burner to fire at least 20 minutes to allow the
heat exchanger to rise to the operating temperature.
8. Observe the gas manifold pressure and compare to
the data on the Burner Test Report under both high
and low fire conditions.
9. Check the flue (stack) combustion temperature at the
ID blower housing test port. Make sure the test probe
is inserted halfway into the ID inlet tube as shown in
Figure 27 on the next page. Compare the results to
the Burner Test Report.
10. The ignition transformer is intermittent. Pilot continues
to burn after ignition transformer is de-energized.
11. Using the signal generator, cycle the burner to check
capacity modulation. Observe valve/damper actuator
operation as shown in Figure 28 on the next page.
12. Using the standard operating controls, cycle the
burner several times to assure proper sequencing
of start-up, firing, and capacity modulation, plus
operation of all safety and monitoring controls.
13. Test the 180°F high temperature safety by running the
burner with the airflow off or diverted. The burner will
shut down at 180°F. Turn the AHU on as quickly as
possible to remove the heat from the heat exchanger.
14. Test the burner efficiency last. The burner should
be running at high fire rate for 30 minutes before
efficiency testing is done.
15. Efficiency at high fire is pre-determined, but may be
checked by flue gas analysis at the entrance to the
ID Blower Housing Test Port. At high fire, the CO2
should be between 8-1/2% and 10%; the 02 should
be between 7-1/2% and 4%. With these ranges,
efficiency is 80% plus or minus 2% as shown in
Figure 27 on the next page.
16. Contact the contractor, facilities manager or customer
to inform them that the start-up was completed
successfully.
17. In the unlikely event that adjustment is required; it is
done at high fire and must NOT retard low fire light-
off.
18. Direct any questions to the Krueger Field Service
Office or Product Technical Support before contacting
the burner manufacturer.
19. When operated at low fire for extended periods, more
condensate is generated and with it deposits of solids
in the condensate drainage system.
20. Provide the ability to prime the trap. During initial
and seasonal start up, trap inspection and priming
is required. Condensate in the trap will evaporate
during long periods of non-use.
21. Trap and drainage system should be cleaned
annually.
CAUTION -
Do not change the set up of factory
pre-set air inlet dampers on the power flame
burner.
FIGURE 26 - DRAFT OVER FIRE TEST PORT
