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KAH Operation & Maintenance Guide
Page: 24 of 88
SECTION 2 - START-UP & OPERATION (CONTINUED)
Checking the Burner
1. Open the fuse disconnects before working on burner as shown
in Figure 23 (right).
2. Check all wire terminations for tightness.
3. Check that the incoming voltage(s) are correct. Compare the
measured voltages to the burner motor and ID motor nameplates,
and the burner test report. Reset the fuse disconnects.
4. Check for the correct rotation of the three phase burner and ID motors.
5. Verify that the contractor purged the new gas lines of air up to
the manual valve on the gas train.
6. Open the valves, which were closed for shipping. Check that all
manual valves operate without leaks.
7. The flue (stack) damper is located at the discharge of the ID
blower and was closed for shipping. Release the locking
mechanism, and set the damper to match the position indicated
by the scribed markings. Lock it in place as shown in Figure 24
(right).
8. Inspect the condensate drain trap to see that it is large enough.
9. Measure the gas supply pressure coming into the gas train as
shown in Figure 25 (right). Gas pressure can be greater than
shown on the burner test report, but it must be between the min.
/ max. values listed in Table 6 on page 28.
10. Visually check that the high temperature safety limit is set for a
200-230°F range. The limit switch is typically mounted behind
the burner control panel.
11. Connect a 0-15” gas pressure gauge or other suitable instrument
to the gas manifold port. The gas pressure will be measured
when running. Refer to Step 4 in Starting the Burner.
12. On Powerflame burners, the test port is downstream of the main
regulator, typically on a standard tee fitting in the main gas line.
13. On Eclipse burners, the test port is located on the backside of
the burner below the spark igniter. A small valve is provided at
this test port.
14. Connect a manometer or other suitable device to the heat
exchanger draft port located on the side of the AHU near the
burner. The expected draft should read slightly negative about
-0.03 inches WC. The draft port is typically made of 3/4” steel
pipe and may be plugged. Remove plug and add a small stop
valve and a nipple for a rubber tube.
15. Install the Honeywell S7800 Test Module, if available.
16. Connect the signal generator (0-20mA) to terminals in place
of modulation control signal (for 2-10 VDC signal add a 500 Ω
resistor in series).
17. Visually check that the flue (stack) is secure and connected
properly. Typical connections are shown at the end of these
instructions.
18. The burner panel’s ON/OFF switch should be off.
19. The system is now ready for start up.
FIGURE 23 - OPEN FUSE DISCONNECTS
BURNER
CONTROL
PANEL
FIGURE 25 - CHECK MAIN GAS SUPPLY
PRESSURE
FIGURE 24 - SET ID FAN DAMPER
