Chromalox®
Installation
and
RENWEAL PARTS IDENTIFICATIONDIVISION 4 |
| SECTION NWHMTO | |
SALES | (Supersedes PE438) |
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REFERENCE | |||
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Type NWHMTO Circulation Heater (for Regular and
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| Fuel Oil Heating) |
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| for 3/4" Conduit |
| Specifications — Table A |
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Internal |
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Thermostat |
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| Dimensions (In.) | ||
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1" Pipe |
| 9- | 1/ | 4" |
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| Model | Volts | Phase | kW | W/In2 | A | B | C | |
Outlet (Std.) |
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3" |
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2 Mtg. Lugs Ea. |
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| 120 | 1 or 3 | 1 | 15 | — | ||||||||
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| 240 or 480 | 23 | |||||||
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with Two 3/8" - 16 |
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| 15 |
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Holes on |
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Centers |
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1" Pipe |
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| 240 or 480 | 1 or 3 | 5 | 15 | ||||
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Inlet |
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3" |
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(Std.) |
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| 240 or 480 | 1 or 3 | 7.5 | 15 | 56 | 50 | |||||||
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3/8" NPT |
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| 240 or 480 | 1 or 3 | 9 | 15 | 67 | 61 | |||
Pipe Plug |
| 7" |
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GENERAL
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 local Chromalox representative for details.
The NWHMTO series is a
The 3 steel sheathed tubular elements are centered in a
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
CAUTION: Users should install adequate
INSTALLATION
WARNING: Hazard of Shock. Disconnect all power 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.
4.Mount heaters to permit unrestrained expansion of chamber due to temperature. This can be accomplished by using a slotted mount-
Incorrect
Correct
ing assembly on either of the lugs.
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.
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.
Correct
Incorrect
Figure A — Vertical Mounting
Figure B — Horizontal Mounting
© 2010 Chromalox, Inc.