CleaverBrooks ProFire Q Series, Установка, эксплуатация и обслуживание

Страница: 61 / 88

750-437
Q Series Full Modulation
6-3
Troubleshooting
6.3 — Troubleshooting - General
TABLE 6- 1.
Troubleshooting
Problem Possible Causes
Burner Does Not Start 1. No voltage at the LMV3 power input terminals.
a. Main disconnect switch open.
b. Blown control circuit fuse.
c. Loose or broken electrical connection.
2. LMV3 requires resetting.
3. Limit circuit not completed - no voltage at end of limit circuit program relay terminal.
a. Pressure or temperature is above setting of operation control
b. Water below required level. Low-water light (and alarm horn) should indicate this
condition. Check manual reset button, if provided, on low-water control.
c. Fuel pressure must be within settings of low pressure and high pressure switches.
d. Check burner air proving switch and high-fire limit switch.
4. Fuel valve interlock circuit not completed.
a. Fuel valve auxiliary switch not closed.
5. Blower motor not operating.
a. Blower motor fuse is blown.
No Ignition 1. Lack of spark.
a. Electrode grounded or porcelain cracked.
b. Improper electrode setting.
c. Loose terminal on ignition cable, cable shorted.
d. Inoperative ignition transformer.
e. Insufficient or no voltage at ignition circuit terminal.
2. Spark but no flame.
a. Lack of fuel - no gas pressure, closed valve, broken line, etc.
b. V48A valve is closed due to closed vent valve. The bleed valve screw should be
open one (1) turn counterclockwise from the fully closed position as a starting
point. See 4.2.1.
3. Running interlock circuit not completed.
a. Combustion air proving switch defective or not properly set.
Problem Possible Causes
No Main Flame 1. Gas train:
a. Manual gas cock closed.
b. Safety shutoff valve inoperative.
c. Gas pressure regulator inoperative.
2. Flame detector defective, sight tube obstructed or lens dirty.
3. Insufficient or no voltage at main fuel valve circuit terminal.