6.0Trouble-Shooting
Symptom | Cause | Check | Remedy |
|
|
|
|
1. Burner does not | a) Air pressure switches | a) Check pressures in | a) Change pressure |
start initially. | not making. | duct at location of | connections where |
|
| switch connections. | a more positive |
| b) Faulty pressure | b) Check electrical | pressure is present. |
| switches. | portion of switch. |
|
|
|
|
|
2. Burner kicks out | a) Low gas pressure | a) Check low pressure | a) Reset |
shortly after | switch set too high. | switch setting. |
|
|
|
|
|
3. Pilot will not ignite on | a) Raw gas fed into pilot | a) Check spark plug for | a) Adjust pilot gas cock by |
initial | causing carbon hair on | carbon hair; also check | first screwing needle |
| spark plug. | gap on plug (should be | closed, then with trans- |
|
| 3/64" - 3/32". | former powered, open |
|
|
| needle slowly 1/4 turn |
|
|
| at a time. |
|
|
|
|
4. Flame failure when | a) Gas pressure to pilot | a) Check pilot gas pressure | a) Relocate pilot gas line or |
burner goes to high fire. | regulator too high. | to regulator (should be | use second pilot |
|
| 1 PSIG maximum). | regulator. |
| b) Bolts which fasten pilot | b) Check tightness of bolts. | b) Tighten bolts. |
| casting to burner are not |
| c) Clean impulse line of any |
| tight enough. | c) Check impulse line for | dirt particles and relocate |
| c) Pilot regulator not react- | possible dirt clogging; | duct connection to trans- |
| ing fast enough to duct | also check impulse line | mit maximum duct |
| pressure changes. | duct connection to | pressure. |
| d) Check valve stuck open. | determine if an effective | d) Clean check valve. |
|
| pressure is being trans- |
|
| e) Too much pilot gas. | mitted to regulator. | e) Reduce pilot gas flow. |
|
|
|
|
5. Flame failure when main | a) Gas pressure to pilot | a) See Check 4a. | a) See Remedy 4a. |
burner returns from high | regulator. |
|
|
to low fire. | b) | b) Check pilot regulator | b) Open needle on pilot |
|
| inlet and outlet gas | adjusting cock slowly |
|
| pressures; also check | 1/4 turn at a time. |
|
| pilot flame. |
|
|
| c) See Check 4c. | c) See Remedy 4c. |
|
|
|
|
6. Main flame too large at | a) Gas pressure too high | a) Check gas pressures. | a) Screw out on main gas |
high fire. | at burner inlet. |
| pressure regulator. |
|
|
| Adjust linkage on gas |
| b) Combustion air pressure | b) Check air pressure | control valve to hold |
| too low. | differential. | valve less than full open |
|
|
| when at high fire. |
| c) Check valve stuck open. |
| b) Open air shutter on |
|
|
| makeup air blower. |
|
|
| c) Clean check valve. |
|
|
|
|
7. Main flame not | a) Air pressure | a) Check air pressure | a) Close air shutter on |
extending beyond face | differential too high. | differential between | makeup air blower. |
of burner at high fire. | b) Burner not firing rated | combustion air manifold | b) Screw in on main gas |
| input. | and main duct. | pressure regulator to |
|
| b) Check gas pressure | provide more gas. |
| c) Burner gas holes | differential. | c) Clean gas holes with #42 |
| plugged. | c) Check gas holes for dirt | MTD drill. Clean air |
|
| or lint. | holes with #27 MTD |
|
|
| drill. |
|
|
|
|
8. Main flame long and | a) Velocity past burner | a) Check velocities and | a) Open shutter on |
yellow. | lower than 500 FPM. | rotation of main | makeup air blower. |
| b) Check valve stuck open. | circulating fan. | b) Clean check valve. |
|
|
|
|
Info 140 11/4/03