Table 5-1. Troubleshooting - Continued
10. Low operating tem-
perature - Continued
d. Scale buildup in cod - Continued
pressure gage and outlet pressure
gage exceeds 100 psi unit should be
e. Soot buildup in coil.
e. Inspect coil and remove burner and
heater shell hat. Wash soot off coil.
f. Combustion air adjusted incorrectly.
f. See malfunction 3, step h.
g. Copper tube lines or regulator are
leaking or cracked.
g. Locate and repair leaks or replace
h. Improper venting of combustion
chamber (excessive wind).
h. Check for excessive downdraft vent
11. Excessive smoke in burner
a. Combustion air adjusted in-
a. See malfunction 3, step h.
b. Blower inlet dirty or obstructed, or
b. Inspect blower inlet. Clean inlet and
remove obstruction. Clean blower.
c. Incorrect blower rotation.
c. See malfunction 3, step f.
d. Dirty fuel strainer.
d. See malfunction 6, step d.
e. Water in fuel.
e. See malfunction 8, step k.
f. Dirty or worn burner nozzles.
f. See malfunction 8, step g.
g. Improper fuel being used.
g. Use only fuels having 30-38 API
h. Excessive soot buildup in coil or
h. See malfunction 10, step e.
12. Unit operates rough, coil hammers
a. Air dome needs draining.
a. Coil outlet and back pressure gages
pulsate. Drain air dome every 4
hours. (see daily maintenance in-
b. Back pressure in heating coils
excessive (scale buildup).
b. Coil outlet and back pressure gages
pulsate. Run back pressure check.
c. Faulty bearings in water pump.
c. Coil outlet and back pressure gages
pulsate. See malfunction 9, step h.
d. Pump and motor belts are slipping.
d. Refer to belt adjustment and
tighten in accordance with recom-
Section III. GENERAL MAINTENANCE
Maintenance and Adjustments
This section provides the procedures for main-
tenance and adjustments that are required to keep
the steam cleaner operating properly.
Coil Descaling Procedure (Acid Washing)
a. Under all operating conditions, natural
mineral deposits in water will form scale deposits
within the heating coils, requiring periodic removal.
b. The descaling procedure is accomplished as
(1) Remove nozzle from cleaning gun. Turn
off water supply to cleaner and close soap solution
(2) Disconnect coil inlet hose (water supply
hose from water pump to air dome inlet pipe
assembly) and attach auxiliary descale pump and
tank. (Not required when using unit water supply
For extremely frequent descaling, it is advisable
to use auxiliary descale pump and tank.
(3) Fill auxiliary or unit tank 1/3 full of water
and affix cleaning gun in a manner that, with descale
pump in operation, water is circulating from descale
tank through heating coil, steam hose and cleaning
gun back to descale tank.
(4) Be sure there is adequate water level in
descale tank to maintain acid pump prime.
Returning water is filtered through the screening to
avoid recirculating scale chips during acid wash