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WATLOW IND.
I&M NUMBER: 316-42-5-1
Date: 6/11/2008
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plug. If leak persists, remove heating unit and add teflon tape or sealing compound to threads and re-install.
Care should be taken to observe the orientation of the flange or plug to its original position.
Troubleshooting
PROBLEM
No power available to heater
Fuses blowing
Not enough power
Fluid not heating to desired
temperature
High limit tripping / alarm
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.
If enclosure is moisture resistant, check condition of cover gasket. A replacement can be obtained from the
factory.
Liquid immersed units should be removed from tank and checked periodically for scale build-up. Clean as
required. Scale can cause high sheath temperature and result in inefficiency and shortened life. When the
heater is removed or tightened, take care to orient the heater in the position it was originally
oriented.
Replacement Parts
Reference the Circulation heater part number on the nameplate when ordering replacement parts.
Recommended spare parts would be : an immersion heater, flange gasket, and thermostat (if supplied).
WATLOW IND.n # 6 INDUSTRIAL LOOP RD. n HANNIBAL MO, 63401n PHONE 573-221-2816 n FAX 573-221-3723
WATROD Circulation Heater Installation & Maintenance Manual
Check disconnect switch to ensure it is in the "ON" position
and that fuses are not blown. Replace fuses if they are blown
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.
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
Not enough Kw
Too much heat loss
Not enough fluid flow
Too much Kw
Line voltage higher than designed / allowable
Cause / Correction
Page: 5
Rev: 2.00
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