Watlow FIREBAR Circulation Heater - Manual (Page 5)

WATLOW IND.
FIREBAR® Circulation Heater Installation & Maintenance Manual
I&M Number: 316-42-1-1 Page: 5
Date: 06-11-08 Rev: 2.00
________________________________________________________________________________________________________________________________________________________________________________________________________________________
WATLOW IND.n # 6 INDUSTRIAL LOOP RD. n HANNIBAL MO, 63401n PHONE 573-221-2816 n FAX 573-221-3723
4. Megohm is within acceptable limits
5. Proper temperature controls and safety limiting devices are in place
6. Heater is securely installed in tank header and no leaks are visible
Before energizing heater, correct fluid flow should be maintained over the heater bundle to ensure that
heater elements do not overheat and fail.
After applying power to the heater make sure that the system is being controlled properly before leaving it to
run unattended. Failure to do this could result in overheating resulting in personnel danger and fire.
Thermal cycling may cause the gasket or sealed joints to relax causing a leak. On flange units, tighten bolts
to re-seat the gasket. If the leak persists, consult the factory for a new gasket. On screw plug units, tighten
threaded plug. If leak persists, remove heating unit and add teflon tape or sealing compound to threads and
reinstall. When the heater is removed or tightened, take care to orient the "TOP" again on the nozzle
side of the tank. The element supports are installed to create a baffling effect so it's important that
this orientation be maintained.
Troubleshooting
PROBLEM Cause / Correction
No power available to heater Check disconnect switch to ensure it is in the "ON" position
and that fuses are not blown. Replace fuses if they are blown
Fuses blowing Check heater electrical rating. Applied voltage may be wrong
Check fuse rating. Fuses should be at least 25% more than full
load amperage.
Disconnect heater power source. Check the heater resistance
to ground. This should be no less than 1 Megohm. Refer to
Megohm checking.
Not enough power Check line voltage to ensure it is within specification
Check full line current if voltage is correct. If line current is lower,
the heater may be wired wrong or has open elements
Fluid not heating to desired Not enough Kw
temperature Too much heat loss
High limit tripping / alarm Not enough fluid flow
Too much Kw
Line voltage higher than designed / allowable
Preventative Maintenance
CAUTION: HAZARD OF ELECTRIC SHOCK. TURN ALL POWER TO HEATER OFF, USE
APPROPRIATE DISCONNECT LOCKOUTS AND ALLOW SYSTEM/HEATER TO COOL BEFORE
PERFORMING ANY MAINTENANCE
!
Check line connections to make sure they are tight, free of oxide build-up, and that no dust or dirt build-up is
present. Retighten to 20 in-lbs as necessary.
Check enclosure (inside) for rust, dirt or dust. Remove rust if present, with steel wool (or equal) and
thoroughly blow clean with dry, oil-free air.