Chromalox Water Heater NWHMT User Manual

®
Chromalox  
SERVICE REFERENCE  
Installation, Operation  
and  
MAINTENANCE INSTRUCTIONS  
DIVISION  
SALES  
4
SECTION NWHMT  
(Supersedes PE439-1)  
REFERENCE  
PE439-2  
161-303186-001  
DATE  
APRIL, 1999  
Type NWHMT Circulation Heater  
(for Water Heating)  
1-1/16” Dia. K.O.  
for 3/4” Conduit  
Internal  
Thermostat  
9-1/4”  
Specifications — Table A  
1” Pipe  
Outlet (Std.)  
Dimensions (In.)  
3”  
C
Model  
Volts  
Phase  
kW  
W/In2  
A
B
C
NWHMT-3305  
NWHMT-3455  
NWHMT-3605  
NWHMT-3905  
NWHMT-31205  
NWHMT-31505  
NWHMT-31805  
1
20, 240 or 480  
240 or 480  
240 or 480  
240 or 480  
240 or 480  
240 or 480  
240 or 480  
1 or 3  
1 or 3  
1 or 3  
1 or 3  
1 or 3  
1 or 3  
1 or 3  
3
4.5  
6
50  
50  
50  
50  
50  
50  
50  
21-5/8  
21-5/8  
34-3/4  
34-3/4  
57-1/2  
57-1/2  
57-1/2  
9-3/8  
2 Mtg. Lugs ea. with  
two 3/8” - 16 x 1-1/2”  
deep holes on 1-1/4”  
centers  
9-3/8  
B
A
22-1/2  
22-1/2  
45-1/4  
45-1/4  
45-1/4  
16-1/2  
16-1/2  
39-1/4  
39-1/4  
39-1/4  
9
12  
15  
18  
1” Pipe  
Inlet (Std.)  
3”  
3/8” NPT  
Pipe Plug  
7”  
GENERAL  
metal jacket.  
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.  
Depending upon the specifications, the NWHMT may or may not  
be factory equipped with AR or other Chromalox thermostats. Such  
thermostats function to control outlet temperatures and limits internal  
temperatures under abnormal flow conditions. These controls do not  
fail-safe.  
Hazardous area terminal housings are available, consult your  
Local Chromalox representative for details.  
The NWHMT series is a general-purpose water circulation heater  
intended for use indoors.  
The three Copper sheathed tubular elements are centered in a 2-  
1/2” diameter galvanized heating chamber and sealed in a removable  
screwplug. The assembly is surrounded by 1-1/2” insulation and sheet  
CAUTION: Users should install adequate back-up con-  
trols 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 rec-  
ommendations.  
INSTALLATION  
ments may be seriously damaged (Figure 2).  
WARNING: Hazard of Shock. Disconnect all power  
3. The NWHMT series of circulation heaters are provided with  
mounting lugs to support the heater chamber. Refer to drawing  
above for location of these mounting lugs.  
before installing heater.  
1. Vertical mounting (axis of chamber vertical, see above drawing.)  
is preferred with terminal housing at top of heater (Figure 1).  
2. When mounting heater horizontally, inlet and outlet pipes must be  
up. In any other position, heater cannot be purged of air and ele-  
4. Mount heaters to permit unrestrained expansion of chamber due to  
temperature. This can be accomplished by using a slotted mount-  
ing assembly on either of the lugs.  
Correct  
Incorrect  
Correct  
Incorrect  
Figure 2 — Horizontal Mounting  
Figure 1 — Vertical Mounting  
© 2010 Chromalox, Inc.  
 

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