Honeywell R7120D, Руководство по установке, Страница: 14 / 40

R7120D BURNER CONTROL MODULES
66-1196EF—01 14
i. If the pilot does not ignite and if the ignition spark is
still continuous, adjust the pressure regulator until a
pilot is established.
j. When the pilot ignites properly and stays ignited,
open the master switch and remove the jumper(s)
from the terminals of the subbase.
k. Check for adequate bleeding of the fuel line.
l. Reinstall the Relay Module on the subbase, close the
master switch and then return to step 4.
7. When pilot ignites, measure the flame signal. If the pilot
flame signal is unsteady or approaching the 1.25 Vdc
minimum value, adjust the pilot flame size or detector
sighting to provide a maximum and steady flame signal.
8. Recycle the system to recheck lightoff and pilot flame signal.
9. When the MAIN LED turns on, make sure the automatic
main fuel valve is open; then smoothly open the manual
main fuel shutoff valve(s) and watch for main burner
flame ignition. When the main burner flame is estab-
lished, go to step 16.
10. If the main burner flame is not established within five
seconds or the normal lightoff time as specified by the
equipment manufacturer, close the manual main fuel
shutoff valve(s).
11. Recycle the system to recheck the lightoff and pilot
flame signal.
12. Smoothly open the manual fuel shutoff valve(s) and try
lightoff again. (The first re-attempt may have been required
to purge the lines and bring sufficient fuel to the burner.)
13. If the main burner flame is not established within five
seconds or the normal lightoff time specified by the
equipment manufacturer, close the manual main fuel
shutoff valve(s). Check all burner adjustments.
14. If the main burner flame is not established after two attempts:
a. Check for improper pilot size.
b. Check for excess combustion air at low fire.
c. Check for adequate low fire fuel flow.
d. Check for proper gas supply pressure.
e. Check for proper valve operation.
f. Check for proper pilot flame positioning.
15. Repeat steps 8 and 9 to establish the main burner
flame; then go to step 16.
16. With the sequence in RUN, make burner adjustments
for flame stability and Btu input rating.
17. Shut down the system by opening the burner switch or
by lowering the setpoint of the operating controller.
Make sure the main flame goes out. There may be a
delay due to gas trapped between the valve(s) and
burner. Make sure all automatic fuel valve(s) close.
18. Restart the system by closing the burner switch and/or
raising the setpoint of the operating controller. Observe
that the pilot is established during PILOT IGN and the
main burner flame is established during MAIN IGN
within the normal lightoff time.
19. Measure the flame signal. Continue to check for the
proper signal through the RUN period. Check the signal
at both High and Low Firing Rate positions and while
modulating, if applicable.
20. Run the burner through another sequence, observing
the flame signal for:
a. Pilot flame alone.
b. Pilot and main flame together.
c. Main flame alone (unless monitoring an intermittent
pilot). Also observe the time it takes to light the main
flame. Ignition of main flame should be smooth.
21. Make sure all readings are in the required ranges
before proceeding.
22. Return the system to normal operation.
NOTE: After completing these tests, open the master switch
and remove all test jumpers from the subbase termi-
nals, limits/controls or switches.
Direct Spark Ignition Systems
This check applies to gas and oil burners not using a pilot. It
should immediately follow the preliminary inspection. Refer to
the appropriate sample block diagram of field wiring for the
ignition transformer and fuel valve(s) hookup.
NOTE: Low fuel pressure limits, if used, could be open. If so,
bypass them with jumpers during this check.
1. Open the master switch.
2. Complete the normal ready-to-fire checkout of the fuel
supply and equipment as recommended by the equip-
ment manufacturer.
3. Close all manual main fuel shutoff valve(s). Check that
the automatic fuel valve(s) is closed. Make sure fuel is
not entering the combustion chamber.
4. Close the master switch and start the system with a call
for heat by raising the setpoint of the operating control-
ler; see the relay module sequencing. The program
sequence should start the INITIATE sequence.
5. Let the sequence advance through PREPURGE (if applica-
ble). Ignition spark should occur when the PILOT LED turns
on. Listen for the click of the first stage fuel solenoid valve(s).
The Relay Module locks out and the ALARM LED turns on.
6. Let the Relay Module complete its cycle.
7. Open the manual fuel shutoff valve(s).
8. Push the reset button and the relay module recycles the
program sequence through PREPURGE (if applicable).
9. When the PILOT LED turns on, make sure that the first
stage burner flame is established. If it is, go to step 15.
10. If the first stage burner flame is not established within
four seconds, or within the normal lightoff time specified
by the equipment manufacturer, close the manual fuel
shutoff valve(s), and open the master switch.
11. Check all burner adjustments.
12. Wait about three minutes. Close the master switch,
open the manual fuel shutoff valve(s), and try to light off
the burner again. The first attempt may be required to
purge the lines and bring sufficient fuel to the burner.
13. If the first stage burner flame is not established within
four seconds, or within the normal lightoff time specified
by the equipment manufacturer, close the manual fuel
shutoff valve(s), and open the master switch.
14. If necessary, repeat steps 11 through 13 to establish
the first stage burner flame. Then go to step 15.
15. When the first stage burner flame is established, the
sequence advances to RUN. Make burner adjustments
for flame stability and input rating. If a second stage is
used, go to step 18.
16. Shut down the system by opening the burner switch or
by lowering the setpoint of the operating controller.
Make sure the burner flame goes out and all automatic
fuel valves close.
17. If used, remove the bypass jumpers from the low fuel
pressure limit and subbase.
18. If a second stage is used, make sure the automatic sec-
ond stage fuel valve(s) opened. Check the lightoff as
follows (or go to step 19):
a. Open the manual second stage fuel valve(s).
b. Restart the system by raising the setpoint of the
operating controller.