Supplement 4987 Page 4
The following instructions will help resolve the majority of field service problems encountered with Series 4987 Zephyr ™ Burners.
PROBLEM
REMEDY
I. Blower motor will not start
(a) Magnetic starters tripped out.
Reset starter overloads. Check motor amps and size of heater coils.
(b) Fuse in disconnect blown.
Replace fuse(s). Check blower motor amps. Check wiring to blower motor.
(c) Motor inoperative.
Repair or replace motor.
(d) Flame supervision.
Press reset switch.
II. Burner will not ignite
(a) Manual gas valve is closed.
Open the valve.
(b) Main gas safety shutoff valve not open (c) Insufficient gas pressure.
Check terminals at valve. If valve is powered and will not open, replace valve.
Gas regulator outlet pressure should be 5" to 10"w.c. Adjust if necessary.
(d) Gas mod. motor not at low fire.
A low fire limit switch in the control motor must be made before automatic safety shutoff valves will open. Remove plug and holder from burner. Attach ignition wire and lay on burner. Shut manual gas valves and power the transformer. The spark should easily jump the plug gap. Remove plug and holder from burner. Attach ignition wire and lay on burner. Energize ignition transformer and check to see that spark is not inside spark plug holder. If spark is arcing to the plug holder, replace the wire. Remove plug wire, energize the transformer, and using an insulated screwdriver, short the high voltage termi- nal to ground. If the spark jumps less than ¼ ", replace transformer. Use caution, the ignition transformer delivers 6000 volts.
(e) Spark plug not arcing.
(f) Ignition lead shorting out.
(g) Ignition transformer inoperative.
III. Main Flame is long and yellow at high fire (a) Main gas regulator outlet
Check gas pressure either at the burner gas inlet tap or at the metering orifice if so equipped.
pressure set too high.
Readjust regulator per step 11 of the start-up instructions if necessary.
(b) Air damper incorrectly set.
With only the circulating fan and the burner blower on, reset the manual air damper to give a 1”w.c. air pressure differential between the burner and duct as per step 5 of the start-up instructions.
(c) Blower running backwards.
Open and lockout disconnect switch at starter and switch any two motor lead wires.
(d) Blower impeller dirty.
Remove motor and impeller as a unit and clean. It is normally not necessary to remove impeller from motor shaft .
PERIODIC CHECK AS DETERMINED BY APPLICATION AND IN ACCORDANCE WITH NFPA 86 (a) With the burner in operation, close the manual gas valve downstream of the second SSOV. The automatic safety shutoff valves should de-energize and close in 3 seconds or less, indicating that the flame supervisory system is operating normally. Note : It will be necessary to reset the flame supervisory switch after this test. (b) Manually confirm that each safety limit switch, one at a time, is functioning properly and shuts down (i.e. de-energize SSOV)the burner. (c) If the burner is equipped with an air filter, clean or replace the element depending on whether it is of a permanent or disposable type. (d) Clean blower impeller. Lock out motor starter before removing blower motor and impeller from burner. Clean impeller and reinstall in burner. It is nor- mally not necessary to remove impeller from motor shaft. (e) Remove and clean the spark plug and the flame rod or UV sensor bulb. Note: This is a special ærated spark plug. Using a standard plug will result in frequent fouling and create lighting problems.
WARNING: Situations dangerous to personnel and property may exist with the operation and maintenance of any combustion equipment. The presence of fuels, oxidants, hot and cold combustion products, hot surfaces, electrical power in control and ignition circuits, etc., are inherent with any combustion application. Components in combustion systems may exceed 160°F (71°C) surface temperatures and present hot surface contact hazard. Fives North American Combustion, Inc. suggests the use of combustion systems that are in compliance with all Safety Codes, Standards, Regulations and Directives; and care in operation.
CONTACT fna.sales@fivesgroup.com T +1 800 626 3477 - F +1 216 373 4237
Fives North American Combustion, Inc. 4455 East 71st Street - Cleveland, OH 44105 - USA www.fivesgroup.com
Made with FlippingBook flipbook maker