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Installation
1. Vertical mounting (axis of chamber vertical) is pre-
ferred. Check factory for constructions suitable for
horizontal mounting.
2. Mount heater with terminal enclosure at top, and
use lower nozzle as inlet to the circulating fluid.
3. The NWHO-45, 72 and 108 series of circulation
heaters are provided with mounting lugs to support
the heater chamber. Refer to Figure A for one sug-
gested mode of support.
Wiring
HAZARD OF ELECTRIC SHOCK. Any installation
involving electric heaters must be grounded to
earth to eliminate shock hazard.
1. Electric wiring to heater must be installed in accor-
dance with National Electrical Code and with local
codes.
2. Because of high operating temperatures expected,
aluminum wiring is not recommended.
3. Refer to Wiring Diagram Figure B for the typical wir-
ing used for connecting the NWHO-45 series heat-
er.
4. Three 3 phase circuits is a typical design for these
heaters. Other circuit arrangements are often sup-
plied depending upon customer specifications or
amperage rating.
Figure A
4. Mount heaters to permit unrestrained expansion of
chamber due to temperature. The large flange lug
should be bolted solidly; however, the remaining lug
should be bolted loosely to allow freedom of move-
ment with expansion.
5. DANGER: Hazard of Fire. Provide minimum of 6"
spacing from chamber and related piping to near-
est combustible material. Avoid operation of heater
near combustible fluids or in combustible vapor or
gas laden atmosphere. Note: Contact factory for
heaters suitable for use in hazardous locations.
6. Provide adequate space at terminal end to permit
withdrawal of the heater from chamber should ser-
vicing be required.
7. If two or more heaters are needed to provide the
needed heating capacity, arrange them for series
flow.
8. DANGER: Possible Explosion. A pressure relief
valve should be provided by customer at outlet of
vessel. There should be no valving between vessel
and relief valve.
Figure B
3
Fuses
1L1
1L2
1L3
Contactor
Fuses
2L1
2L2
2L3
Thermostat
Contactor
Fuses
3L1
3L2
Over-Temp
3L3
Cutout
Contactor
120V
or
240V
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