Rapid 7500 136, Инструкция по установке, эксплуатации и обслуживанию

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SECTION 19: T
ROUBLESHOOTING
131 of 143
Burner (continued)
19.4 Gas Operation
PROBLEM POSSIBLE CAUSE SOLUTION
Occasional Locko u ts for No
Apparent Reason
Occasional lo w v oltage s u pply. Ha v e local u tility correct.
Occasional lo w gas s u pply press u re. Ha v e local u tility correct.
Air leak in oil s u ction line or check v al v e not
holding.
Correct as req u ired.
PROBLEM POSSIBLE CAUSE SOLUTION
B u rner Motor R u ns, bu t
Pilot Does Not Light
Gas s u pply to bu rner sh u t off. Make s u re all man u al gas s u pply v al v es
are open. A u tomatic high press u re.
Pilot solenoid v al v e not opening. Listen and feel for v al v e act u ation. Sole-
noid v al v e not b eing po w ered--check elec-
trical circ u itry. Replace coil or entire v al v e
if coil is bu rned o u t.
Defecti v e gas pilot reg u lator. Replace.
Gas press u re too high or too lo w at pilot orifice. Refer to gas pilot adj u stments for correct
settings. Readj u st as req u ired.
Defecti v e ignition transformer. Replace.
Incorrect ignition electrode settings. Refer to gas pilot adj u stments for correct
settings.
Defecti v e flame safeg u ard control or pl u g in
p u rge timing card.
Replace as req u ired.
Air flo w s w itch not making circ u it. Check o u t electrically and correct pres-
s u re adj u stment on s w itch If req u ired.
Defecti v e air flo w s w itch. Replace.
Air s w itch negati v e press u re sensing t ub e o u t
of position.
Reposition as necessary.
B u rner Motor R u ns and
Pilot Lights, bu t Main Gas
Flame is Not Esta b lished.
Main sh u t off or test cock closed. Check to make certain f u lly open.
Pilot flame signal reading too lo w to p u ll in
flame safeg u ard relay.
Refer to gas pilot settings section and
readj
u st as req u ired.
Defecti v e a u tomatic main or a u xiliary gas sh u t
off v al v es.
Check electrical circ u itry to v al v es.
Replace v al v es or correct circ u itry as
req u ired.
Defecti v e flame safeg u ard control or pl u g in
amplifier.
Check and replace as req u ired.
B u tterfly v al v e set incorrectly on mod u lating
bu rner.
Readj u st as req u ired.
Main gas press u re reg u lator atmospheric v ent
line o b str u cted.
Correct.
Defecti v e main gas press u re reg u lator Replace.
Misadj u sted main gas press u re reg u lator Readj u st to meet req u ired operational v al-
u es.