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R7795A,B,C,D
CHECKOUT
INITIAL LIGHTOFF CHECK FOR DIRECT
SPARK IGNITION OF OIL (Oil Burners Not
Using a Pilot)
This check applies to oil burners not using a pilot. It
should immediately follow the preliminary inspection.
NOTE: Low fuel pressure limits, if used, could be open. If
so, bypass them with jumpers during this test.
1. Open the master switch.
2. Complete the normal ready to fire checkout of the oil
supply and equipment as recommended by the oil burner
manufacturer.
3. Close all manual fuel shutoff valves. Check that the
automatic fuel valve(s) are closed. Make sure oil is not
entering the combustion chamber.
4. Close the master switch and start the system with a
call for heat. (Raise the setpoint of the controller.) The
program sequence will start.
5. Let the sequence advance through prepurge. When
entering the ignition trial period, watch for ignition spark
and listen for the click of the first stage oil solenoid.
6. Let the program sequence complete its cycle.
7. Open the manual first stage oil valve.
8. Reset the lockout switch and recycle the system
through prepurge.
9. When entering the ignition trials, watch for the first
stage burner flame to establish. If the first stage oil burner
flame does not establish within five seconds (or the normal
lightoff time specified by the manufacturer, close the manual
first stage oil valve and open the master switch, and continue
with step 10. If flame is established, proceed to step 14.
10. Purge the combustion chamber to remove any un-
burned oil; check all burner adjustments.
11. Wait about three minutes, close the master switch,
open the manual first stage oil valve, and try lightoff
again. The first attempt may have been necessary to purge
the fuel lines and bring sufficient fuel to the burner.
12. If the first stage oil burner flame is not established
within five seconds (or the time specified by the burner
manufacturer), close the manual first stage oil valve and
open the master switch.
13. If necessary, repeat steps 10 through 12 to establish
the first stage burner flame. Then proceed to step 14.
14. When the first stage oil burner flame is established,
the sequence advances to the normal burner run period.
Make burner adjustments for flame stability and input
rating. If a second stage is used, make sure the automatic
second stage oil valve has opened.
15. Shut down the system by lowering the setpoint of the
burner controller. Make sure that the flame has gone out
and all automatic oil valves close.
16. If used, remove the bypass jumpers from the low fuel
pressure limits.
17. If a second stage oil valve is used, check the lightoff
as follows. Otherwise go to step 18.
a. Open the manual second stage oil valve.
b. Restart the system by raising the setpoint of the
burner controller.
c. When the first stage burner flame is estab-
lished, watch for the automatic second stage oil
valve to open. Observe that the second stage
flame lights off properly.
d. Make burner adjustments for flame stability and
input rating.
e. Shut down the system by lowering the setpoint of
the burner controller. Make sure the burner flames
go out and all of the automatic oil valves close.
18. Restart the system by raising the setpoint of the
burner controller. Observe that the burner flame is estab-
lished during the ignition trial period within the normal
lightoff period specified by the burner manufacturer.
19. Measure the flame signal. Continue to check for the
proper signal (Table 3) into the normal run period. Check
the signal at the high and low firing rate positions, if
applicable. Any pulsating or unsteady readings require
further adjustments.
20. Make sure all readings are in the required ranges
before proceeding.
PILOT TURNDOWN TEST (All Installations
Using a Pilot)
Perform this check on all installations using a pilot.
This test makes sure that the main burner can be lighted by
the smallest pilot flame that will hold in the flame relay.
Clean the detector to assure that it will detect the smallest
acceptable pilot flame.
NOTE: Low fuel pressure limits, if used, could be open.
If so, bypass them with jumpers during this test.
1. Open the master switch.
2. Close the manual main fuel shutoff valve(s).
3. Connect a manometer or pressure gauge to measure
the pilot gas pressure during the turndown test.
4. Open the manual pilot shutoff valve.
5. Close the master switch and start the system with a
call for heat (raise the setpoint of the burner controller). The
sequence should start.
NOTE: INTERMITTENT PILOT MODELS should con-
tinue with step 6. INTERRUPTED PILOT MODELS
should proceed to step 7.
6. INTERMITTENT PILOT MODELS—After the se-
quence has entered the normal burner run period, very
slowly turn down the pilot gas pressure, reading the ma-
nometer (or gauge) as the pressure drops. Stop immedi-
ately when the Flame Indicator LED goes out. Note the
pressure at this point.
a. If the orange jumper IS NOT CLIPPED: allow
the R7795 to recycle through prepurge. If the
orange jumper IS CLIPPED: reset the safety switch
and allow the R7795 to recycle through prepurge.
b. As the control attempts to relight the pilot, turn
the pilot gas pressure back up slowly until the
Flame Indicator LED comes on. (Complete this
step within the four or ten second pilot flame
establishing period or lockout will occur.)
c. Turn the pilot back down slightly but not enough
to cause the Flame Indicator LED to go out. (Keep
the pilot gas pressure just above the reading noted
in step 6 above.)
14
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