Chromalox®

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Installation Operation

 

 

 

SERVICE REFERENCE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

and

 

 

DIVISION 4

 

 

SECTION NWH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SALES

(Supersedes PE405-5)

PE405-6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RENEWAL PARTS IDENTIFICATION

 

REFERENCE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

161-048380-001

1-3/8” Conduit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DATE

JULY, 1990

 

 

 

 

 

Openings

 

 

 

 

 

 

 

 

 

 

 

 

 

12-5/16”

 

 

 

 

 

 

Type NWH-3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D

 

 

E

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Outlet

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1” Pipe

 

 

 

 

 

 

 

 

 

 

 

 

 

Circulation Heater

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Thermostat

 

for Water Heating

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type AR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A

 

 

B

 

 

 

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Specifications — Table A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Mounting Lugs

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3/8” - 16

Model

Voltage

 

Phase

kW

Watt

Dimensions (In.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Threaded Holes -

 

 

 

 

 

 

 

Density

A

B

 

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1-1/2” Deep

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1-1/4” Centers

NWH-3625

 

 

 

 

1 or 3Δ

6

47.7

32-15/16

22-1/2

 

16-1/2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NWH-3925

240

 

 

1 or 3Δ

9

47.5

32-15/16

22-1/2

 

16-1/2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NWH-31225

or

 

 

1 or 3Δ

12

46.2

42-15/16

32-1/2

 

26-1/2

 

 

 

1” Pipe Inlet

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NWH-31525

480

 

 

1 or 3Δ

15

45.9

55-7/16

45

 

39

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NWH-31825

 

 

 

 

1 or 3Δ

18

45.6

55-7/16

45

 

39

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GENERAL

The NWH-3 series is a general-purpose water or water-based solution circulation heater intended for use indoors. It is designed for 150 psig at 550˚F per ANSI standards.

The 3 copper-sheathed tubular elements are centered in a 3” diameter galvanized steel heating chamber and welded to a removable galvanized steel flange. The assembly is surrounded by 1-1/2” insulation and sheet metal jacket.

Depending upon the order specifications, the NWH-3 may or may not be factory equipped with an AR or other Chromalox

thermostat. Such thermostats function to control outlet tempera- tures and to limit internal temperatures under abnormal flow con- ditions. These controls do not fail safe.

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 essential. Although the safety of the installation is the responsibility of the user, Chromalox will be glad to make equipment recommendations.

INSTALLATION

CAUTION: Hazard of Electric Shock. Disconnect all power before installing heater.

1.Vertical Mounting (Preferred) —

When the heater is vertically mounted, the terminal housing will be at the top of the heater. The water inlet pipe will be located on the side near the bottom of the heater and the outlet pipe at the top.

The axis of the chamber will be in a vertical position as in the photo above, and as in Figure A.

Note: A drain pipe located at the bottom of the heater should

be provided and enough room left, when mounting heater, to allow draining the heater.

2.Horizontal Mounting (Optional) —

When mounting heater horizontally, inlet and outlet pipes must be up. In any other position, heater cannot be purged of air, and elements may be seriously damaged. (See Figure B.)

Correct

Incorrect

Correct Incorrect

Figure A — Vertical Mounting

Figure B — Horizontal Mounting

© 2010 Chromalox, Inc.

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Chromalox NWH-3925, NWH-31825, NWH-31525, NWH-31225, NWH-3625 specifications General, Installation
Page 1 Page 2

NWH-31525, NWH-31825, NWH-31225, NWH-3925, NWH-3625 specifications

Chromalox is a leader in thermal technologies, renowned for manufacturing high-quality heating solutions tailored for various industrial applications. Among their extensive product offerings are the NWH series heaters, which includes models NWH-3625, NWH-3925, NWH-31225, NWH-31825, and NWH-31525. These units are designed to deliver exceptional performance and reliability in demanding environments.

The NWH series heaters feature robust construction and are engineered to withstand challenging conditions. Made from durable materials, these heaters are resistant to corrosion, ensuring long-term operational life. One of the standout characteristics of these models is their ability to provide precise temperature control, which is critical in applications requiring stringent thermal management.

Each model in the NWH series is equipped with advanced heating technologies, including high-efficiency heating elements that allow for rapid heat-up times and consistent temperature maintenance. This efficiency not only improves performance but also reduces energy consumption, making the NWH heaters an environmentally friendly choice.

In terms of operational versatility, the NWH series heaters are designed for a wide range of applications, from process heating and fluid heating to equipment protection. Their compact design enables easy integration into existing systems, while their robust electrical and mechanical configurations provide the necessary flexibility for various installations.

Safety is paramount in the design of Chromalox heaters. The NWH models incorporate multiple safety features, such as built-in thermal cutoffs and over-temperature protection, which safeguard both the equipment and personnel in industrial settings.

Additionally, these heaters are equipped with user-friendly controls, allowing for seamless operation and monitoring. The digital displays provide real-time feedback, facilitating timely adjustments and ensuring optimal performance.

In summary, Chromalox NWH-3625, NWH-3925, NWH-31225, NWH-31825, and NWH-31525 heaters represent the pinnacle of thermal technology. Their combination of efficiency, reliability, and safety features, along with their capacity for precise temperature maintenance, make them ideal solutions for a variety of industrial heating applications. Investing in these models ensures not only effective thermal management but also contributes to a more sustainable operational approach, aligning with modern industrial demands.
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