Chromalox NWHO-6 Operation, Maintenance, Renewal Parts Identification, Regular Oil Heaters

OPERATION

1.Do not heat solutions that are corrosive to the heating element sheath or the heating chamber.

WARNING: Type NWHO Circulation Heaters are equipped with steel heating elements and galva- nized-steel heating chambers. It is the responsibil- ity of the user to know the chemical composition of the corrosive solution and the character of the materials entering the solution as well as the cor- rosive effect of the solution upon the heating ele- ments and chamber. Chromalox cannot warrant

any electric circulation heater against failure by sheath corrosion if such failure is the result of operating conditions beyond our control.

2.Terminal ends of heater must be protected from drippings, condensation, spray or direct spill-over of material. Their presence at the terminals may damage heater electrical insula- tion. Liquid-tight terminal enclosures are available to protect heater. Contact your Local Chromalox Sales office.

3.If foreign material is carried by the liquid flow, install suitable filters in the inlet pipe line to the heater.

4.Do not allow heater to operate when liquid flow is interrupted.

MAINTENANCE

1.WARNING: Hazard of Electric Shock. Disconnect all power before servicing heater.

2.Remove heating element assembly periodically to check heater sheath for scaling, corrosion or excessive oxidation. Correct operating conditions to minimize sheath deterioration.

3.Periodically check temperature control and limit control oper- ation to insure accurate and safe process operations.

4.Check all electrical connections periodically and retighten connections which may have loosened in service. Replace wire and wire terminals which show signs of oxidation which would interfere with establishment of reliable electrical connections.

RENEWAL PARTS IDENTIFICATION

Regular Oil Heaters

Model	Volts	Phase	kW	Heating Element
NWHO-61215	240	3 ▲	12	155-115846-028
NWHO-61215	480	3 ▲	12	155-115846-030
NWHO-61515	240	3 ▲	15	155-115846-035
NWHO-61515	480	3 ▲	15	155-115846-037
NWHO-62015	240	2-3 ▲	20	155-115846-042
NWHO-62015	480	3 ▲	20	155-115846-044
NWHO-62515	240	2-3 ▲	25	155-115846-047
NWHO-62515	480	3 ▲	25	155-115846-049
NWHO-63015	240	2-3 ▲	30	155-115846-051
NWHO-63015	480	3 ▲	30	155-115846-053

Fuel Oil Heaters

Model	Volts	Phase	kW	Heating Element
NWHO-60825	240	1	8	155-115844-004
NWHO-60825	240	3 Δ	8	155-115844-005
NWHO-60825	480	1	8	155-115844-006
NWHO-60825	480	3 Δ	8	155-115844-007
NWHO-61025	240	3 Δ	10	155-115844-012
NWHO-61025	480	3 Δ	10	155-115844-014
NWHO-61025	240	3 Δ	12	155-115844-019
NWHO-61025	480	3 Δ	12	155-115844-021
NWHO-61525	240	3 Δ	15	155-115844-023
NWHO-61525	480	3 Δ	15	155-115844-025
NWHO-61525	240	3 Δ	18	155-115844-027
NWHO-61525	480	3 Δ	18	155-115844-029

Note: When ordering parts for Model Numbers suffixed by “XX” or any other letter or letters not specifically identified on this instruction sheet, order Renewal Parts on special order basis, giving name of part, part number, model number and description.

PARTS COMMON TO ALL HEATERS

Gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132-017222-016

Thermostat (AR2525) . . . . . . . . . . . . . . . . . . .300-013863-038

Thermostat (AR5525) . . . . . . . . . . . . . . . . . . .300-013863-039