Chromalox Air Conditioner NWHMTO User Manual

®
Chromalox  
SERVICE REFERENCE  
Installation  
DIVISION  
SALES  
4
SECTION NWHMTO  
(Supersedes PE438)  
and  
REFERENCE  
PE438-1  
RENWEAL PARTS IDENTIFICATION  
161-303185-001  
DATE  
MAY, 1999  
Type NWHMTO Circulation Heater (for Regular and  
Fuel Oil Heating)  
1-1/16" Dia. K.O.  
for 3/4" Conduit  
Specifications — Table A  
Internal  
Thermostat  
Dimensions (In.)  
9-1/4"  
1" Pipe  
Outlet (Std.)  
Model  
Volts  
Phase  
kW  
W/In2  
A
B
C
3"  
C
NWHMTO-3015  
NWHMTO-3015  
NWHMTO-3035  
NWHMTO-3305  
NWHMTO-3355  
NWHMTO-3505  
NWHMTO-3505  
NWHMTO-3075  
NWHMTO-3095  
NWHMTO-3905  
120  
240 or 480  
15  
23  
15  
23  
15  
23  
15  
23  
15  
23  
1 or 3  
1
25-5/8  
9-3/8  
2 Mtg. Lugs Ea.  
with Two 3/8" - 16  
x1-1/2" Deep  
Holes on 1-1/4"  
Centers  
A
B
240 or 480  
240 or 480  
240 or 480  
240 or 480  
1 or 3  
1 or 3  
1 or 3  
1 or 3  
3
5
34-3/4  
22-1/2  
16-1/2  
57-1/2  
34-3/4  
68-1/4  
57-3/8  
79-1/4  
57-1/2  
45-1/4  
22-1/2  
56  
45-1/4  
67  
39-1/4  
16-1/2  
50  
39-1/4  
61  
1" Pipe  
Inlet  
(Std.)  
3"  
7.5  
9
3/8" NPT  
Pipe Plug  
7"  
45-1/4  
39-1/4  
GENERAL  
Depending upon the specifications, the NWHMTO 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.  
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.  
Hazardous area terminal enclosures are available, consult your  
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 installation is the responsibility of the user,  
Chromalox will be glad to make equipment recom-  
mendations.  
local Chromalox representative for details.  
The NWHMTO series is a general-purpose oil circulation heater  
intended for use indoors.  
The 3 steel sheathed tubular elements are centered in a 2-1/2” diam-  
eter steel heating chamber and welded to a removable screw plug. The  
assembly is surrounded by 1-1/2” insulation and sheet metal jacket.  
INSTALLATION  
ing assembly on either of the lugs.  
WARNING: Hazard of Shock. Disconnect all power  
5. DANGER: Hazard of Fire. Provide minimum of 6” spacing  
from a chamber and related piping to nearest combustible materi-  
al. Avoid operation of heater near combustible fluids or in com-  
bustible vapor or gas laden atmosphere.  
before installing heater.  
1. Vertical mounting (axis of chamber vertical as in sketch above) is  
preferred. (Terminal housing at top of heater)  
2. When mounting heater horizontally, inlet and outlet MUST be up.  
In any other position, heater cannot be purged of air and elements  
may be seriously damaged. (See Figure B below)  
3. The NWHMTO series of circulation heaters are provided with  
mounting lugs to support the heater chamber. Refer to sketch  
above for location of these mounting lugs.  
6. Provide adequate space at terminal end to permit withdrawal of the  
heater from chamber should servicing be required.  
7. If two or more heaters are needed to provide the needed heating  
capacity, arrange them for series oil flow.  
8. DANGER: Possible Explosion. A pressure relief valve  
should be provided by customer at outlet of vessel. There should  
be no other valving between vessel and valve.  
4. Mount heaters to permit unrestrained expansion of chamber due to  
temperature. This can be accomplished by using a slotted mount-  
Correct  
Incorrect  
Correct  
Incorrect  
Figure A — Vertical Mounting  
Figure B — Horizontal Mounting  
© 2010 Chromalox, Inc.  
 

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