Chromalox Electric Heater PE429 1 User Manual

Installation, Operation  
and  
4
NWHO  
(Supersedes PE429)  
PE429-1  
161-058065-001  
RENEWAL PARTS IDENTIFICATION  
FEBRUARY, 1986  
Type NWHO-45, 72, 108  
Circulation Heaters for  
Regular and Fuel Oil  
Heating  
E
2 x 3/  
Slot  
4
1”  
B
Specifications – Table A  
Dimensions (In.)  
No. 3Ø  
813/16”  
Model  
NWHO-4590  
NWHO-45125 240 or 480 125  
NWHO-45150 240 or 480 150  
NWHO-45175 240 or 480 175  
NWHO-45200 240 or 480 200  
Volts 3Ø  
240 or 480  
kW  
90  
Circuits  
A
B
C
D
E
D
5
5
5
5
5
721/  
871/  
1021/  
1171/  
125 251/  
2
251/  
251/  
251/  
251/  
2
635/  
785/  
935/  
1085/  
1161/  
8
1813/  
1813/  
1813/  
16  
16  
16  
16  
16  
121/  
121/  
121/  
121/  
121/  
2
2
2
8
2
5 Conduit  
Outlets  
2
2
8
2
2
2
8
1813/  
2
72° Apart  
or  
2
8
1813/  
2
C
A
6” Outlet  
NWHO-77220 240 or 480 200  
NWHO-77225 240 or 480 225  
NWHO-77250 240 or 480 250  
6
6
6
971/ 273/  
1051/ 273/  
1131/ 273/  
981/ 291/  
1041/ 291/  
1101/ 291/  
2
4
885/  
965/  
1045/  
8
19  
19  
19  
193/  
193/  
193/  
133/  
133/  
133/  
141/  
141/  
141/  
4
6 Conduit  
Outlets  
Mounting  
Lug Centers  
2
4
8
4
2
4
8
4
60° Apart  
Temperature  
Control  
NWHO-108300 240 or 480 300  
NWHO-108325 240 or 480 325  
NWHO-108350 240 or 480 350  
6
6
6
2
2
895/  
955/  
1011/  
16  
16  
16  
8
2
2
2
8
2
2
2
8
2
These Dimensions are typical. Check factory for dimensions of a particular unit.  
6” Inlet  
GENERAL  
The high capacity NWHO-45, 72 or 108 series are intended for  
indoor use and are used primarily for oil heating.  
temperatures and to limit internal temperatures under abnormal  
flow conditions. These controls do not fail-safe.  
The 45, 72 or 108 steel sheathed tubular elements are centered  
in a 14”, 16” or 18” diameter steel heating chamber, respectively,  
and welded to a removable steel flange. The assembly is sur-  
rounded by 2” of insulation and a sheet metal jacket.  
Depending upon the order specifications, the NWHO-45, 72 or  
108 may or may not be factory equipped with an MF2 or other  
Chromalox thermostat. Such thermostats function to control outlet  
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 essen-  
tial. Although the safety of the installation is the  
responsibility of the user, Chromalox will be glad to  
make equipment recommendations.  
INSTALLATION  
1. Vertical mounting (axis of chamber  
vertical) is preferred. Check factory  
for constructions suitable for hori-  
zontal mounting.  
2. Mount heater with terminal enclo-  
sure at top, and use lower nozzle as  
inlet to the circulating fluid.  
should be bolted solidly; however, the remaining lug should be  
bolted loosely to allow freedom of movement with expansion.  
5. DANGER: Hazard of Fire. Provide minimum of 6” spac-  
ing from chamber and related piping to nearest combustible  
material. Avoid operation of heater near combustible fluids or  
in combustible vapor or gas laden atmosphere. Note: Contact  
factory for heaters suitable for use in hazardous locations.  
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 heat-  
ing capacity, arrange them for series flow.  
8. DANGER: Possible Explosion. A pressure relief valve  
should be provided by customer at outlet of vessel. There  
should be no valving between vessel and relief valve.  
3. The NWHO-45, 72 and 108 series  
of circulation heaters are provided  
with mounting lugs to support the  
heater chamber. Refer to Figure A  
for one suggested mode of support.  
4. Mount heaters to permit unre-  
strained expansion of chamber due  
Figure A  
to temperature. The large flange lug  
© 2010 Chromalox, Inc.  
 

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