Chromalox®

Installation

and

RENWEAL PARTS IDENTIFICATION

SERVICE REFERENCE

DIVISION 4

 

SECTION NWHMTO

SALES

(Supersedes PE438)

PE438-1

REFERENCE

 

 

 

161-303185-001

DATE MAY, 1999

Type NWHMTO Circulation Heater (for Regular and

 

 

 

1-1/16" Dia. K.O.

Fuel Oil Heating)

 

 

 

 

 

 

 

 

for 3/4" Conduit

 

Specifications — Table A

 

 

 

 

 

 

Internal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Thermostat

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Dimensions (In.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1" Pipe

 

9-

1/

4"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Model

Volts

Phase

kW

W/In2

A

B

C

Outlet (Std.)

 

 

 

 

 

 

 

 

 

 

 

3"

 

 

 

 

 

 

2 Mtg. Lugs Ea.

 

 

 

 

 

 

NWHMTO-3015

120

1 or 3

1

15

25-5/8

9-3/8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NWHMTO-3015

240 or 480

23

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

with Two 3/8" - 16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NWHMTO-3035

 

 

 

15

 

 

 

x1-1/2" Deep

 

 

 

C

 

B

 

A

 

240 or 480

1 or 3

3

34-3/4

22-1/2

16-1/2

Holes on 1-1/4"

 

 

 

 

 

 

 

 

 

 

 

NWHMTO-3305

23

Centers

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1" Pipe

 

 

 

 

 

 

 

 

 

 

 

NWHMTO-3355

240 or 480

1 or 3

5

15

57-1/2

45-1/4

39-1/4

 

 

 

 

 

 

 

 

 

 

 

NWHMTO-3505

23

34-3/4

22-1/2

16-1/2

Inlet

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3"

 

 

 

 

 

 

 

 

 

(Std.)

 

 

 

 

 

 

NWHMTO-3505

240 or 480

1 or 3

7.5

15

68-1/4

56

50

 

 

 

 

 

 

 

 

 

 

 

 

3/8" NPT

 

 

 

 

 

 

 

 

 

 

 

NWHMTO-3075

23

57-3/8

45-1/4

39-1/4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NWHMTO-3095

240 or 480

1 or 3

9

15

79-1/4

67

61

Pipe Plug

 

7"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NWHMTO-3905

23

57-1/2

45-1/4

39-1/4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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 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.

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.

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.

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.

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Chromalox specifications General, Installation, Specifications Table a, NWHMTO-3305, NWHMTO-3505 240 or 68-1/4

NWHMTO specifications

Chromalox NWHMTO is an innovative product designed to meet the needs of various industrial heating applications. As part of Chromalox's esteemed range of products, the NWHMTO model stands out due to its advanced features, robust design, and versatile technologies.

One of the main features of the NWHMTO is its high efficiency. This heater is designed to provide maximum thermal transfer while minimizing energy consumption. With a built-in control system, users can easily adjust the temperature settings to optimize heating processes, leading to significant savings on energy costs. The variable watt density capability further enhances its efficiency, allowing for precise temperature control according to the specific requirements of various applications.

The NWHMTO employs cutting-edge technology to ensure optimal performance. It integrates advanced materials that are engineered to withstand high temperatures and harsh environments. This characteristic not only prolongs the lifespan of the heater but also ensures reliable performance even under demanding conditions. The robust construction of the NWHMTO allows it to operate in a variety of industrial settings, including chemical processing, food production, and plastic fabrication.

Safety is a paramount consideration in the design of the NWHMTO. It incorporates multiple safety features, including over-temperature protection and leak detection systems. These features work together to mitigate risks and provide operators with peace of mind while using the heater. Additionally, the NWHMTO is designed for easy integration into existing systems, making it a practical choice for upgrading or replacing outdated heating equipment.

Another characteristic of the NWHMTO is its flexibility. It can be configured for a broad range of applications, including process heating, thawing, and melt-out services. The modular design allows for customization based on the user's specific heating needs. As a result, the NWHMTO can adapt to various industrial processes, making it a versatile tool for engineers and operators alike.

In summary, the Chromalox NWHMTO represents a significant advancement in industrial heating technology. With its high efficiency, robust construction, advanced safety features, and versatility, it meets the diverse demands of modern industrial applications. Companies seeking to enhance their heating processes will find the NWHMTO to be a reliable and effective solution.