Chromalox Electric Heater NWHO 6 User Manual

®
Chromalox  
SERVICE REFERENCE  
Installation Instructions  
DIVISION  
SALES  
4
SECTION NWHO  
(Supersedes PE408-3)  
and  
REFERENCE  
PE408-4  
RENEWAL PARTS IDENTIFICATION  
161-048341-001  
DATE  
JULY, 1990  
1-3/8” Conduit  
Openings  
16-1/16  
Type NWHO-6  
2” Pipe  
Outlet  
C
Circulation Heaters (for  
Thermostat  
Type AR  
Regular and Fuel Oil Heating)  
Specifications — Table A  
Regular Oil Heaters  
A
B
25”  
Dimensions (In.)  
Model  
Volts  
Phase  
kW  
W/In2  
Mounting Lugs  
A
B
C
3/8” - 16  
Threaded Holes -  
1-1/2” Deep  
NWHO-61215  
NWHO-61515  
NWHO-62015  
NWHO-62515  
NWHO-63015  
240 or 480  
240 or 480  
240 or 480  
240 or 480  
240 or 480  
3 Δ  
3 Δ  
3 Δ  
3 Δ  
3 Δ  
12  
15  
20  
25  
30  
23  
23  
23  
23  
23  
41-3/4  
48-3/4  
60-1/4  
73-5/8  
86-5/8  
30  
37  
48-1/2  
61-7/8  
74-7/8  
11-3/8  
14-1/8  
20-5/8  
27-5/16  
33-7/8  
1-1/4” Centers  
Fuel Oil Heaters  
2” Pipe Inlet  
NWHO-60825  
NWHO-61025  
NWHO-61225  
NWHO-61525  
NWHO-61825  
240 or 480  
240 or 480  
240 or 480  
240 or 480  
240 or 480  
1 or 3 Δ  
8
15  
15  
15  
15  
15  
41-3/4  
48-3/4  
60-1/4  
73-5/8  
86-5/8  
30  
37  
48-1/2  
61-7/8  
74-7/8  
11-3/8  
14-1/8  
20-5/8  
27-5/16  
33-7/8  
3 Δ  
3 Δ  
3 Δ  
3 Δ  
10  
12  
15  
18  
8-5/8  
GENERAL  
The NWHO-6 series is a general-purpose regular and fuel oil  
solution circulation heater intended for use indoors. It is designed  
for 150 psig at 550˚F per ANSI standards.  
212˚F limit stop.) Such thermostats function to control outlet tem-  
peratures and to limit internal temperatures under abnormal flow  
conditions. These controls do not fail safe.  
The 6 steel-sheathed tubular elements are centered in a 5”  
diameter galvanized steel heating chamber and welded to a  
removable galvanized steel flange. The assembly is surrounded  
by 1-1/2” insulation and sheet metal jacket.  
Depending upon the order specifications, the NWHO-6 may  
or may not be factory equipped with an AR or other Chromalox  
thermostat. (Note: UL listed models are factory pre-set with a  
WARNING: Users should install adequate back-up con-  
trols and safety devices with their electric heating equip-  
ment. Where the consequences of failure may be severe,  
back-up controls are essential. Although the safety of the  
installation is the responsibility of the user, Chromalox  
will be glad to make equipment recommendations.  
INSTALLATION  
Note: A drain pipe located at the bottom of the heater should be pro-  
vided and enough room left, when mounting heater, to allow draining  
the heater.  
Caution: Hazard of Electric Shock. Disconnect all  
power before installing heater.  
1. Vertical Mounting (Preferred) —  
When the heater is vertically mounted, the terminal housing will  
be at the top of the heater. The inlet pipe will be located on the side  
near the bottom of the heater and the outlet pipe at the top.  
The axis of the chamber will be in a vertical position as in the  
photo above and as in Figure A.  
2. Horizontal Mounting (Optional) —  
When mounting heater horizontally, inlet and outlet pipes must  
be up. In any other position, heater cannot be purged of air, and  
elements may be seriously damaged. (See Figure B.)  
Correct  
Incorrect  
Correct  
Incorrect  
Figure B — Horizontal Mounting  
Figure A — Vertical Mounting  
© 2010 Chromalox, Inc.  
 
OPERATION  
1. Do not heat solutions that are corrosive to the heating element  
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.  
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  
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  
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.  
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.  
RENEWAL PARTS IDENTIFICATION  
Fuel Oil Heaters  
Regular Oil Heaters  
Model  
Volts  
Phase  
kW  
Heating Element  
Model  
Volts  
Phase  
kW  
Heating Element  
NWHO-60825  
NWHO-60825  
NWHO-60825  
NWHO-60825  
240  
240  
480  
480  
1
3 Δ  
1
8
8
8
8
155-115844-004  
155-115844-005  
155-115844-006  
155-115844-007  
NWHO-61215  
NWHO-61215  
240  
480  
3 L  
3 L  
12  
12  
155-115846-028  
155-115846-030  
3 Δ  
NWHO-61515  
NWHO-61515  
240  
480  
3 L  
3 L  
15  
15  
155-115846-035  
155-115846-037  
NWHO-61025  
NWHO-61025  
NWHO-61025  
NWHO-61025  
240  
480  
240  
480  
3 Δ  
3 Δ  
3 Δ  
3 Δ  
10  
10  
12  
12  
155-115844-012  
155-115844-014  
155-115844-019  
155-115844-021  
NWHO-62015  
NWHO-62015  
240  
480  
2-3 L  
3 L  
20  
20  
155-115846-042  
155-115846-044  
NWHO-62515  
NWHO-62515  
240  
480  
2-3 L  
3 L  
25  
25  
155-115846-047  
155-115846-049  
NWHO-61525  
NWHO-61525  
NWHO-61525  
NWHO-61525  
240  
480  
240  
480  
3 Δ  
3 Δ  
3 Δ  
3 Δ  
15  
15  
18  
18  
155-115844-023  
155-115844-025  
155-115844-027  
155-115844-029  
NWHO-63015  
NWHO-63015  
240  
480  
2-3 L  
3 L  
30  
30  
155-115846-051  
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.  
PARTS COMMON TO ALL HEATERS  
Gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132-017222-016  
Thermostat (AR2525) . . . . . . . . . . . . . . . . . . .300-013863-038  
Thermostat (AR5525) . . . . . . . . . . . . . . . . . . .300-013863-039  
 
Limited Warranty:  
Please refer to the Chromalox limited warranty applicable to this product at  
2150 N. RULON WHITE BLVD., OGDEN, UT 84404  
Phone: 1-800-368-2493  
99 - 063  
TA - R9 - EF  
Litho in U.S.A.  
 

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