York AHU, Operation And Maintenance

Page: 38 / 118

JOHNSON CONTROLS
38
FORM 102.20-OM2
ISSUE DATE: 6/01/2015
SECTION 2 - START-UP AND OPERATION
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 33 on page 38 . 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/damp-
er actuator operation as shown in Figure 34 on
page 38 .
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
CO
2
should be between 8-1/2% and 10%; the 0
2
should be between 7-1/2% and 4%. With these
ranges, efficiency is 80% plus or minus 2% as
shown in Figure 33 on page 38 .
16. Contact the contractor, facilities manager or cus-
tomer to inform them that the start-up was com-
pleted successfully.
17. In the unlikely event that adjustment is required;
it is done at high fire and must NOT retard low
fire light-off.
Do not change the set up of factory pre-
set air inlet dampers on the power flame
burner.
18. Direct any questions to the Johnson Controls
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 an-
nually.
FIGURE 32 - DRAFT OVER FIRE TEST PORT
LD12908
FIGURE 33 - FLUE COMBUSTION TEMPERATURE
AND EFFICIENCY TEST PORT- ID BLOWER
LD12906
FIGURE 34 - DAMPER ACTUATOR
LD12909