®
Chromalox
SERVICE REFERENCE
Installation, Operation
DIVISION
SALES
4
SECTION NWHO
and
(Supersedes PE426-1)
PE426-2
REFERENCE
RENEWAL PARTS IDENTIFICATION
161-058063-001
DATE
JANUARY, 2003
NWHO(F)-18 Circulation Heaters
(for Regular and Fuel Oil Heating)
15-1/8”
Specifications — Table A
2-1/2” Pipe
Outlet
Regular Oil Heaters
Dimensions (In.)
Model
Volts
Phase
kW
W/In2
A
B
C
NWHO-1830R15
NWHO-1840R15
NWHO-1850R15
NWHO-1860R15
NWHO-1870R15
NWHO-1880R15
240 or 480
240 or 480
240 or 480
240 or 480
240 or 480
240 or 480
3 L
3 L
3 L
3 L
3 L
3 L
30
40
50
60
70
80
20
20
20
20
20
20
53-7/8
60-7/8
68-1/2
78
87
97
32-11/16
39-11/16
47-5/16
56-13/16
65-13/16
75-13/16
29-3/16
36-3/16
43-13/16
53-5/16
62-5/16
72-5/16
A
3/4-10 Tap
Mounting
Lugs
B
C
Fuel Oil Heaters
NWHO-1820F15
NWHO-1825F15
NWHO-1830F15
NWHO-1835F15
NWHO-1840F15
NWHO-1845F15
240 or 480
240 or 480
240 or 480
240 or 480
240 or 480
240 or 480
3 L
20
25
30
35
40
45
12
53-7/8
60-7/8
68-1/2
78
87
97
32-11/16
39-11/16
47-5/16
56-13/16
65-13/16
75-13/16
29-3/16
36-3/16
43-13/16
53-5/16
62-5/16
72-5/16
3 L
3 L
3 L
3 L
3 L
12
12
12
12
12
2-1/2” Pipe
Inlet
GENERAL
Depending upon the order specifications, the NWHO(F)-18
may or may not be factory equipped with an AR or other
Chromalox thermostat. Such thermostats function to control outlet
temperatures and to limit internal temperatures under abnormal
flow conditions. These controls do not fail-safe.
FIRE/EXPLOSION HAZARD. This heater is not intend-
ed for use in hazardous atmospheres where flamma-
ble vapors, gases, liquids or other combustible atmos-
pheres are present as defined in the National
Electrical Code. Failure to comply can result in per-
sonal injury or property damage
The system designer is responsible for the safety of
this equipment and should install adequate back-up
controls and safety devices with their electric heating
equipment. Where the consequences of failure could
result in personal injury or property damage, back-up
controls are essential.
The NWHO(F)-18 series is a general purpose regular and fuel
oil solution circulation heater intended for use indoors.
The steel-sheathed tubular elements are centered in a steel
heating chamber and sealed into a removable steel flange. The
assembly is surrounded by insulation and a sheet metal jacket.
© 2010 Chromalox, Inc.
OPERATION
Sheath corrosion can result in a ground fault
FIRE/EXPLOSION HAZARD. Do not exceed the
Pressure-Temperature rating of the flange as listed in
ANSI B16.5.
which, depending upon the solution being heated,
can cause an explosion or fire.
1. Do not heat solutions that are corrosive to the heating element
sheath or the heating chamber.
IMPORTANT: It is the responsibility of the purchas-
er of the heater to make the ultimate choice of
sheath material based upon his knowledge of the
chemical composition of the corrosive solution,
character of the materials entering the solution,
and controls which he maintains on the process.
2. Terminal ends of heater must be protected from drippings, con-
densation, spray or direct spill-over of material. Their presence at
the terminals may damage heater electrical insulation. Liquid-tight
terminal enclosures are available to protect heater. Check with
local sales office.
3. If foreign material is carried by the liquid flow, install suitable fil-
ters in the inlet pipe line to the heater.
4. Do not allow heater to operate when liquid flow is interrupted.
MAINTENANCE
1. Remove heating element assembly periodically to check heater
sheath for scaling, corrosion or excessive oxidation. Correct oper-
ating conditions to minimize sheath deterioration.
ELECTRIC SHOCK HAZARD. Disconnect all power
before installing or servicing heater. Failure to do so
could result in personal injury or property damage.
Heater must be installed by a qualified person in
accordance with the National Electrical Code, NFPA
70.
2. Periodically check temperature control and limit control operation
to insure accurate and safe process operation.
3. Check all electrical connections periodically and retighten connec-
tions 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
Fuel Oil Heaters
Model
Volts
Phase
kW
Heating Element
Model
Volts
Phase
kW
Heating Element
NWHO-1830R15
NWHO(F)-1830R15
NWHO-1830R15
NWHO(F)-1830R15
240
240
480
480
3 L
3 L
3 L
3 L
30
30
30
30
155-013185-331
155-045301-013
155-013185-332
155-045301-014
NWHO-1820F15
NWHO(F)-1820F15
NWHO-1820F15
NWHO(F)-1820F15
240
240
480
480
3 L
3 L
3 L
3 L
20
20
20
20
155-013185-019
155-045301-001
155-013185-020
155-045301-002
NWHO-1840R15
NWHO(F)-1840R15
NWHO-1840R15
NWHO(F)-1840R15
240
240
480
480
3 L
3 L
3 L
3 L
40
40
40
40
155-013185-004
155-045301-016
155-013185-005
155-045301-017
NWHO-1825F15
NWHO(F)-1825F15
NWHO-1825F15
NWHO(F)-1825F15
240
240
480
480
3 L
3 L
3 L
3 L
25
25
25
25
155-013185-022
155-045301-004
155-013185-023
155-045301-005
NWHO-1850R15
NWHO(F)-1850R15
NWHO-1850R15
NWHO(F)-1850R15
240
240
480
480
3 L
3 L
3 L
3 L
50
50
50
50
155-013185-007
155-045301-019
155-013185-008
155-045301-020
NWHO-1830F15
NWHO(F)-1830F15
NWHO-1830F15
NWHO(F)-1830F15
240
240
480
480
3 L
3 L
3 L
3 L
30
30
30
30
155-013185-025
155-045301-007
155-013185-026
155-045301-008
NWHO-1860R15
NWHO(F)-1860R15
NWHO-1860R15
NWHO(F)-1860R15
240
240
480
480
3 L
3 L
3 L
3 L
60
60
60
60
155-013185-010
155-045301-022
155-013185-011
155-045301-023
NWHO-1835F15
NWHO(F)-1835F15
NWHO-1835F15
NWHO(F)-1835F15
240
240
480
480
3 L
3 L
3 L
3 L
35
35
35
35
155-013185-028
155-045301-010
155-013185-029
155-045301-011
NWHO-1870R15
NWHO(F)-1870R15
NWHO-1870R15
NWHO(F)-1870R15
240
240
480
480
3 L
3 L
3 L
3 L
70
70
70
70
155-013185-013
155-045301-025
155-013185-014
155-045301-026
NWHO-1840F15
NWHO(F)-1840F15
NWHO-1840F15
NWHO(F)-1840F15
240
240
480
480
3 L
3 L
3 L
3 L
40
40
40
40
155-013185-031
155-045301-031
155-013185-032
155-045301-032
NWHO-1880R15
NWHO(F)-1880R15
NWHO-1880R15
NWHO(F)-1880R15
240
240
480
480
3 L
3 L
3 L
3 L
80
80
80
80
155-013185-016
155-045301-028
155-013185-017
155-045301-029
NWHO-1845F15
NWHO(F)-1845F15
NWHO-1845F15
NWHO(F)-1845F15
240
240
480
480
3 L
3 L
3 L
3 L
45
45
45
45
155-013185-034
155-045301-034
155-013185-035
155-045301-035
Note: The “F” in NWHO(F) means forced circulation (ie: equipped with baffles.) When replacing the heating element, care must be taken that the baffles line up properly with the inlet and outlet pipes. The top of the
flange of replacement heating elements for forced circulation heaters is stamped near one edge with the letter “P”. The sub-assembly is positioned correctly when the “P” on the flange is in line with the inlet and out-
let pipe. Incorrect placement will result in hindered circulation and possible failure of the element.
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 and description.
Limited Warranty:
Please refer to the Chromalox limited warranty applicable to this product at
2150 N. RULON WHITE BLVD., OGDEN, UT 84404
TA - U0 - EF
Litho in U.S.A.
Phone: 1-800-368-2493
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