Cleaver-Brooks Profire E Series, Установка, эксплуатация и обслуживание, Страница: 62 / 84

Maintenance
5-8 750-297
Profire E/LNE Series Manual
Should it become necessary to replace the complete valve, be sure that the flow is in the direction of the arrow on the
body.
Test for gas leaks and check valve action several times to ensure proper operation before attempting to relight the
burner.
5.13.3 — Gas Pressure Regulators
Check the gas pressure at the outlet of the regulator on the main and pilot lines. Check for abnormal reading and against
original pressures set at initial start-up.
5.13.4 — Gas Pressure Switches
Inspect the low and high gas pressure switch settings and correct response to pressure variations.
5.14 — Electrical System
Because of the many types of flame safeguard systems applicable to this equipment, complete descriptions of all burner
electrical systems are beyond the scope of this manual. An individual electrical schematic drawing is shipped with each
burner and complete operation and troubleshooting instructions are available from the various flame safeguard system
manufacturers.
5.14.1 — Electric Motors
Motor supply voltage must not vary more than 10 percent from nameplate ratings. At initial startup and at least once a
year thereafter, check the motor current with a meter while the burner is in high fire position. If the reading exceeds the
nameplate rating plus service factor, determine the cause and correct it immediately. In dusty locations, clean the motor
regularly to assure adequate cooling. Lubricate in accordance with the manufacturer's instructions.
5.15 — Checking Flame Failure
5.15.1 — Pilot Flame Failure
1.
Shut off the main fuel supply and close the gas pilot shutoff cock.
2.
The pilot ignition circuit will be energized at the end of the pre-purge period. There should be an ignition spark, but
no flame. Since there is no flame to be detected, the program relay will signal the condition.
3.
The ignition circuit will de-energize and the control will lock out on a safety shutdown and the flame failure light
will be activated.
4.
The blower will run through post-purge and stop. Turn the burner switch off and reset the safety switch. Re-open the
gas pilot shutoff cock and re-establish main fuel supply.
5.15.2 — Failure to Light Main Flame
1.
Shut off the main fuel supply and leave the gas pilot shutoff cock open.
2.
Turn the switch on. The pilot will light upon completion of the pre-purge period. The main fuel valves will be
energized, but there should be no main flame.