Chromalox Water Heater NWH 185015 User Manual

Installation, Operation  
and  
4
NWH  
(Supersedes PE424)  
PE424-1  
161-058005-001  
RENEWAL PARTS IDENTIFICATION  
APRIL, 1999  
151/8”  
Type NWH-18 Circulation  
Heater for Water Heating  
2 1/2” Pipe  
Outlet  
(150 Pound Construction)  
Specifications — Table A  
Dimensions (In.)  
A
Model  
Volts  
Phase kW W/In2  
A
B
C
3/4-10 Tap  
Mounting  
Lugs  
B
457/  
8
2411/  
3211/  
3911/  
475/  
5613/  
6513/  
7513/  
16  
16  
16  
16  
16  
16  
16  
213/  
293/  
363/  
4313/  
535/  
625/  
725/  
16  
16  
16  
16  
16  
16  
16  
C
NWH-185015  
NWH-187515  
240 or 480  
240 or 480  
3
3
3
3
3
3
3
50  
75  
42  
45  
537/  
8
NWH-1810015 240 or 480  
NWH-1812515 240 or 480  
NWH-1815015 240 or 480  
NWH-1817515 240 or 480  
NWH-1820015 240 or 480  
100 49  
125 50  
150 50  
175 50  
200 50  
607/  
8
681/  
78  
2
87  
97  
2 1/2” Pipe  
Inlet  
GENERAL  
WARNING: This heater is not intended for use in  
hazardous 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.  
Depending upon the order specifications, the NWH-18 may or  
may not be factory equipped with an AR or other Chromalox  
thermostat. Such thermostats function to control outlet tempera-  
tures and to limit internal temperatures under abnormal flow con-  
ditions. These controls do not fail-safe.  
WARNING: 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 essen-  
tial. Although the safety of the installation is the  
responsibility of the user, Chromalox will be glad  
to make equipment recommendations.  
The NWH-18 series is a general-purpose water or water-based  
solution circulation heater intended for use indoors. It is designed  
for 150 psig at 550°F per ANSI standards.  
The 18 copper-sheathed tubular elements are centered in a 8”  
diameter galvanized steel heating chamber and welded to a  
removable galvanized steel flange. The assembly is surrounded  
by 3” insulation and sheet metal jacket.  
INSTALLATION  
WARNING: Hazard of Shock. Disconnect all power  
before installing heater.  
1. Vertical Mounting (Preferred) —  
Incorrect  
Correct  
When the heater is vertically mounted, the terminal housing  
will be at the top of the heater. The water 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.  
Figure A — Vertical Mounting  
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.  
© 2010 Chromalox, Inc.  
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MAINTENANCE  
1. WARNING: Hazard of 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.  
3. Periodically check temperature control and limit control oper-  
ation to insure accurate and safe process operation.  
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 con-  
nections.  
RENEWAL PARTS IDENTIFICATION  
Parts Common To All Heaters  
Replacement  
Element  
Assembly  
Flexitallic Gasket . . . . . . . . . . . . . . . . . . . . . . . . . . .132-019779-007  
Standard Gasket . . . . . . . . . . . . . . . . . . . . . . . . . . .132-017222-007  
Model  
Volts  
Phase  
kW  
NWH-185015  
NWH-185015  
240  
480  
3
3
50  
50  
155-013185-046  
155-013185-047  
NWH-187515  
NWH-187515  
240  
480  
3
3
75  
75  
155-013185-049  
155-013185-050  
NWH-1810015  
NWH-1810015  
240  
480  
3
3
100  
100  
155-013185-052  
155-013185-053  
NWH-1812515  
NWH-1812515  
240  
480  
3
3
125  
125  
155-013185-058  
155-013185-059  
NWH-1815015  
NWH-1815015  
240  
480  
3
3
150  
150  
155-013185-061  
155-013185-062  
NWH-1817515  
NWH-1817515  
240  
480  
3
3
175  
175  
155-013185-064  
155-013185-065  
NWH-1820015  
NWH-1820015  
240  
480  
3
3
200  
200  
155-013185-067  
155-013185-068  
Note: When ordering parts for Model Numbers suffixed by “XX” or any other letter or letters not specifi-  
cally 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  
TA - U0 - EF  
Litho in U.S.A.  
Phone: 1-800-368-2493  
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