Chromalox Electric Heater PE426 2 User Manual

®
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.  
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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.  
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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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