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WATLOW IND. WATROD Modular Duct Heater Installation & Maintenance Manual
I&M NUMBER: 316-42-15-1 Page: 5
Date:6/11/2008 Rev: 2
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WATLOW IND.n # 6 INDUSTRIAL LOOP RD. n HANNIBAL MO, 63401n PHONE 314-221-2816 n FAX 314-221-3723
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.
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
Air not heating to desired Not enough Kw or incorrect voltage being applied
temperature Too much heat loss, higher wattage heater may be required
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. Re tighten 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.
Replacement Parts
Reference the duct heater part number on the nameplate when ordering replacement parts.
Recommended spare parts would be : a Modular Duct Heater, replacement module, and high limit
thermocouple or high limit thermocouple kit.
To replace individual heater module:
a) Disconnect power and then feeder wire
b) Remove terminal hardware connecting module to be replaced and other adjacent modules.
c) Remove the two Allen head screws and split washers holding module to main flange.
d) Pull module through main flange as shown below.