Honeywell L Manuale Utente

66-1153—03

30

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.

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 

equipment 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 

controller; see the relay module sequencing. The 

program sequence should start the INITIATE sequence.

5. Let the sequence advance through PREPURGE (if 

applicable). 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 R7140 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 

second 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.

c. When the first stage burner flame is established, watch 

for the automatic second stage fuel valve(s) to open. 

Observe that the second stage lights off properly.

d. Make burner adjustments for flame stability and 

input rating.

e. Shut down the system by lowering the setpoint of 

the operating controller. Make sure the burner flame 

goes out and all automatic fuel valves close.

f. Go to step 19.

19. Restart the system by closing the burner switch and/or 

raising the setpoint of the operating controller. Observe 

that the burner flame is established during PILOT IGN, 

within the normal lightoff time specified by the 

equipment manufacturer.

20. 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. Any 

pulsating or unsteady readings require further attention.

21. Make sure all readings are in the required ranges before 

proceeding.

22. Return the system to normal operation.

Perform this check on all installations that use a pilot. The 

purpose of this test is to verify that the main burner can be lit 

by the smallest pilot flame that can hold in the flame amplifier 

and energize the FLAME LED. Clean the flame detector(s) to 

make sure that it detects the smallest acceptable pilot flame. If 

using AMPLI-CHECK™ or self-checking amplifier and 1M 

ohm/volt meter, the flame signal fluctuates every time the 

amplifier does a self-check or a shutter check.

1. Open the master switch.

2. Close the manual main fuel shutoff valve(s).

3. Connect a manometer (or pressure gauge) to measure 

pilot gas pressure during the turndown test.

4. Open the manual pilot shutoff valve(s).

5. Close the master switch and start the system with a call 

for heat. Raise the setpoint of the operating controller. 

The 7800 Series sequence should start, and PRE-

PURGE (if applicable) should begin.