Chromalox Water Heater NWH 31225 User Manual

®
Chromalox  
SERVICE REFERENCE  
Installation Operation  
DIVISION  
SALES  
4
SECTION NWH  
and  
(Supersedes PE405-5)  
REFERENCE  
PE405-6  
RENEWAL PARTS IDENTIFICATION  
161-048380-001  
DATE  
JULY, 1990  
1-3/8” Conduit  
Openings  
12-5/16”  
1” Pipe  
Outlet  
Type NWH-3  
Circulation Heater  
for Water Heating  
D
E
Thermostat  
Type AR  
A
B
C
Specifications — Table A  
Mounting Lugs  
3/8” - 16  
Threaded Holes -  
1-1/2” Deep  
Dimensions (In.)  
Watt  
Density  
Model  
Voltage Phase  
kW  
A
B
C
1-1/4” Centers  
NWH-3625  
NWH-3925  
NWH-31225  
NWH-31525  
NWH-31825  
1 or 3Δ  
6
47.7  
47.5  
46.2  
45.9  
45.6  
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  
1 or 3Δ  
1 or 3Δ  
1 or 3Δ  
1 or 3Δ  
9
12  
15  
18  
1” Pipe Inlet  
480  
45  
39  
F
GENERAL  
The NWH-3 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.  
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.  
The 3 copper-sheathed tubular elements are centered in a 3”  
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 NWH-3 may or  
may not be factory equipped with an AR or other Chromalox  
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 the  
installation is the responsibility of the user, Chromalox  
will be glad to make equipment recommendations.  
INSTALLATION  
CAUTION: Hazard of Electric Shock. Disconnect all  
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.  
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 water inlet pipe will be located on  
the side near the bottom of the heater and the outlet pipe at the top.  
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.)  
The axis of the chamber will be in a vertical position as in  
the photo above, and as in Figure A.  
Correct  
Incorrect  
Correct  
Incorrect  
Figure B — Horizontal Mounting  
Figure A — Vertical Mounting  
© 2010 Chromalox, Inc.  
 
RENEWAL PARTS IDENTIFICATION  
AR2525  
Thermostat Assembly  
MF7  
Model  
Volts  
Phase  
kW  
Heating Elements  
Thermostat Assembly  
NWH-3625  
NWH-3625  
NWH-3625  
NWH-3625  
240  
240  
480  
480  
1
3Δ  
1
6
6
6
6
155-024796-001  
155-024796-002  
155-024796-003  
155-024796-004  
300-057560-007  
300-057560-007  
300-057560-007  
300-057560-007  
300-048481-006  
300-048481-006  
300-048481-006  
300-048481-006  
3Δ  
NWH-3925  
NWH-3925  
NWH-3925  
NWH-3925  
240  
240  
480  
480  
1
3Δ  
1
9
9
9
9
155-024796-006  
155-024796-007  
155-024796-008  
155-024796-009  
300-057560-007  
300-057560-007  
300-057560-007  
300-057560-007  
300-048481-006  
300-048481-006  
300-048481-006  
300-048481-006  
3Δ  
NWH-31225  
NWH-31225  
NWH-31225  
NWH-31225  
240  
240  
480  
480  
1
3Δ  
1
12  
12  
12  
12  
155-024796-011  
155-024796-012  
155-024796-013  
155-024796-014  
300-057560-007  
300-057560-007  
300-057560-007  
300-057560-007  
300-048481-006  
300-048481-006  
300-048481-006  
3Δ  
NWH-31525  
NWH-31525  
NWH-31525  
NWH-31525  
240  
240  
480  
480  
1
3Δ  
1
15  
15  
15  
15  
155-024796-016  
155-024796-017  
155-024796-018  
155-024796-019  
300-057560-007  
300-057560-007  
300-057560-007  
300-057560-007  
300-048481-006  
300-048481-006  
300-048481-006  
300-048481-006  
3Δ  
NWH-31825  
NWH-31825  
NWH-31825  
NWH-31825  
240  
240  
480  
480  
1
3Δ  
1
18  
18  
18  
18  
155-024796-021  
155-024796-022  
155-024796-023  
155-024796-024  
300-057560-007  
300-057560-007  
300-057560-007  
300-057560-007  
300-048481-006  
300-048481-006  
300-048481-006  
300-048481-006  
3Δ  
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  
AR Mounting Bracket . . . . . . . . . . . . . . . . .027-011378-001 (2)  
Flexitallic Gasket . . . . . . . . . . . . . . . . . . . . . .132-019779-001  
Standard Gasket . . . . . . . . . . . . . . . . . . . . . . .132-017222-001  
Note: Number in ( ) indicates quantity of same part number used.  
 
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  
PL - U0 - T3  
Litho in U.S.A.  
 

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