Chromalox Electric Heater NWHO 33015 User Manual

®
Chromalox  
SERVICE REFERENCE  
Installation  
DIVISION  
SALES  
4
SECTION NHWO  
(Supersedes PE406-4)  
and  
REFERENCE  
PE406-5  
RENEWAL PARTS IDENTIFICATION  
161-048710-001  
DATE  
FEBRUARY, 1999  
1-3/8” Conduit  
Openings  
12-5/16”  
Type NWHO-3 Series Circulation Heaters  
(for Regular and Fuel Oil Heating)  
8-1/32”  
1” Pipe  
Outlet  
Specifications — Table A  
Thermostat  
Type AR  
Regular Oil Heaters  
Dimensions (In.)  
A
Mounting Lugs  
B
C
3/8” - 16  
Model  
Volts  
Phase  
kW  
W/In2  
A
B
C
Threaded Holes -  
1-1/2” Deep  
1-1/4” Centers  
NWHO-33015  
NWHO-34515  
NWHO-36015  
NWHO-37515  
NWHO-39015  
3
4.5  
6
7.5  
9
32-15/16  
32-15/16  
42-15/16  
55-7/16  
55-7/16  
22-1/2  
22-1/2  
32-1/2  
45  
16-1/2  
16-1/2  
26-1/2  
39  
240 or 480  
1 or 3 s  
23  
45  
39  
Fuel Oil Heaters  
1” Pipe  
Inlet  
NWHO-30315  
NWHO-30415  
NWHO-30615  
3
4
6
32-15/16  
42-15/16  
55-7/16  
22-1/2  
32-1/2  
45  
16-1/2  
26-1/2  
39  
240 or 480  
1 or 3 s  
15  
6-1/8”  
GENERAL  
Depending upon the order specifications, the NWHO-3 may or  
may not be factory equipped with 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.  
WARNING: This heater is not intended for use in haz-  
ardous atmospheres where flammable vapors, gases,  
liquids or other combustible atmospheres are present  
as defined in the National Electrical Code. Failure to  
comply can result in explosion or fire.  
The NWHO-3 series is a general-purpose regular and fuel oil solu-  
tion circulation heater intended for use indoors. It is designed for 150  
psig at 550˚F per ANSI standards.  
CAUTION: Users should install adequate back-up controls  
and safety devices with their electric heating equipment.  
Where the consequences of failure may be severe, back-  
up controls are essential. Although the safety of installa-  
tion is the responsibility of the user, Chromalox will be  
glad to make equipment recommendations.  
The 3 steel-sheathed tubular elements are centered in a 3” diame-  
ter steel heating chamber and welded to a removable steel flange. The  
assembly is surrounded by 1-1/2” insulation and sheet metal jacket.  
INSTALLATION  
Note: A drain pipe located at the bottom of the heater should be  
provided and enough room left, when mounting heater, to allow  
draining the heater.  
WARNING: Hazard of 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 ele-  
ments may be seriously damaged. (See Figure B.)  
Correct  
Incorrect  
Correct  
Incorrect  
Figure A — Vertical Mounting  
Figure B — Horizontal Mounting  
© 2010 Chromalox, Inc.  
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RENEWAL PARTS IDENTIFICATION  
Regular Oil Heater  
Phase  
Fuel Oil Heater  
Phase  
Heating  
Elements  
Heating  
Elements  
Model  
Volts  
kW  
Model  
Volts  
kW  
NWHO-33015  
NWHO-33015  
NWHO-33015  
NWHO-33015  
240  
240  
480  
480  
1
3
3
3
3
155-024796-031  
155-024796-032  
155-024796-033  
155-024796-034  
NWHO-30315  
NWHO-30315  
NWHO-30315  
NWHO-30315  
240  
240  
480  
480  
1
3
3
3
3
155-024796-066  
155-024796-067  
155-024796-068  
155-024796-069  
3 s  
1
3 s  
1
3 s  
3 s  
NWHO-34515  
NWHO-34515  
NWHO-34515  
NWHO-34515  
240  
240  
480  
480  
1
4.5  
4.5  
4.5  
4.5  
155-024796-036  
155-024796-037  
155-024796-038  
155-024796-039  
NWHO-30415  
NWHO-30415  
NWHO-30415  
NWHO-30415  
240  
240  
480  
480  
1
4
4
4
4
155-024796-071  
155-024796-072  
155-024796-073  
155-024796-074  
3 s  
1
3 s  
1
3 s  
3 s  
NWHO-36015  
NWHO-36015  
NWHO-36015  
NWHO-36015  
240  
240  
480  
480  
1
6
6
6
6
155-024796-041  
155-024796-042  
155-024796-043  
155-024796-044  
NWHO-30615  
NWHO-30615  
NWHO-30615  
NWHO-30615  
240  
240  
480  
480  
1
6
6
6
6
155-024796-081  
155-024796-082  
155-024796-083  
155-024796-084  
3 s  
1
3 s  
1
3 s  
3 s  
NWHO-37515  
NWHO-37515  
NWHO-37515  
NWHO-37515  
240  
240  
480  
480  
1
7.5  
7.5  
7.5  
7.5  
155-024796-046  
155-024796-047  
155-024796-048  
155-024796-049  
3 s  
1
Parts Common To All Heaters  
3 s  
Standard Gasket . . . . . . . . . . . . . . . . . . . . . . . . . .132-017222-015  
Spiral Wound Gasket . . . . . . . . . . . . . . . . . . . . . . .132-073008-009  
Thermostat (Regular Oil) . . . . . . . . . . . . . . . . . . . .300-057502-015  
Thermostat (Fuel Oil) . . . . . . . . . . . . . . . . . . . . . .300-057502-016  
NWHO-39015  
NWHO-39015  
NWHO-39015  
NWHO-39015  
240  
240  
480  
480  
1
9
9
9
9
155-024796-051  
155-024796-052  
155-024796-053  
155-024796-054  
3 s  
1
3 s  
Note: When ordering parts for Model Numbers suffixed by “XX” or any other 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.  
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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  
Phone: 1-800-368-2493  
99 - 050  
TA - P9 - EF  
Litho in U.S.A.  
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