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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
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.
Regular Oil Heaters
Model
Volts
NWHO-61215
240
NWHO-61215
480
NWHO-61515
240
NWHO-61515
480
NWHO-62015
240
NWHO-62015
480
NWHO-62515
240
NWHO-62515
480
NWHO-63015
240
NWHO-63015
480
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.
OPERATION
MAINTENANCE
RENEWAL PARTS IDENTIFICATION
Phase
kW
Heating Element
L L
3
12
155-115846-028
L L
3
12
155-115846-030
L L
3
15
155-115846-035
L L
3
15
155-115846-037
L L
2-3
20
155-115846-042
L L
3
20
155-115846-044
L L
2-3
25
155-115846-047
L L
3
25
155-115846-049
L L
2-3
30
155-115846-051
L L
3
30
155-115846-053
PARTS COMMON TO ALL HEATERS
Gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132-017222-016
Thermostat (AR2525) . . . . . . . . . . . . . . . . . . .300-013863-038
Thermostat (AR5525) . . . . . . . . . . . . . . . . . . .300-013863-039
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.
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.
Fuel Oil Heaters
Model
Volts
NWHO-60825
240
NWHO-60825
240
NWHO-60825
480
NWHO-60825
480
NWHO-61025
240
NWHO-61025
480
NWHO-61025
240
NWHO-61025
480
NWHO-61525
240
NWHO-61525
480
NWHO-61525
240
NWHO-61525
480
Phase
kW
Heating Element
1
8
155-115844-004
3 Δ
8
155-115844-005
1
8
155-115844-006
3 Δ
8
155-115844-007
3 Δ
10
155-115844-012
3 Δ
10
155-115844-014
3 Δ
12
155-115844-019
3 Δ
12
155-115844-021
3 Δ
15
155-115844-023
3 Δ
15
155-115844-025
3 Δ
18
155-115844-027
3 Δ
18
155-115844-029
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