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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
PARTS COMMON TO ALL HEATERS
Gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132-017222-016
Thermostat (AR2525) . . . . . . . . . . . . . . . . . . .300-013863-038
Thermostat (AR5525) . . . . . . . . . . . . . . . . . . .300-013863-039
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
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.
Regular 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
Fuel Oil Heaters