GENERAL

7.Installation in duct larger than heater. For installation where the duct dimensions exceed the insert type heater dimensions, the area beyond the heater dimensions must be filled with wire mesh, expanded or perforated sheet metal of 50% open area as shown in Figure 11. This will maintain a uniform air velocity across the face of the duct.

Inner Baffle

Insert Type

Perforated Metal

 

Duct Heater

(50% Open Area)

Remove Bracket and

 

Oversized Duct

Use Sheetmetal Screws

 

 

Thru Same Holes into Duct.

 

 

Figure 11

8.Installation with flexible duct. Where a duct heater must be installed near a flexible duct connection, be certain that a 4’ minimum distance between the duct heater and the flexible connector exists and that the connector is suitable for 195°F temperature. (Refer to Figure 12).

9.Do not install duct heater outdoors. Duct heaters cannot be installed with rooftop equipment where they are exposed to the weather.

Flexible Duct

(Must be suitable

for 195°F)

Air

Flow

Duct Heater

4 Ft.

Min.

Figure 12

10.Installation with dampers or filters. Maintain at least 4’ dis- tance between duct heater and damper, filter frames, or other similar obstructions. (Refer to Figure 13).

 

4 Ft.

 

 

Min.

 

Damper

Duct

Air Flow

 

Heater

 

 

Top of Duct

 

 

 

Figure 13

 

Clearance: Zero clearance between duct heater and combustible materials such as wood is permissible. However, adequate clear- ance must be provided around terminal box for proper ventilation and future service accessibility.

AIR FLOW

Flow through duct heater must never drop below the minimum air velocity shown on duct heater nameplate. If the air handling system includes filters, they must be cleaned whenever necessary in order to maintain air flow above the minimum, otherwise poor temperature control and discomfort will result.

If air flow is poorly distributed within the duct, deflector vanes must be added to provide correction.

The minimum air velocities shown on the nameplate are not to be considered average readings. Do not add various velocities taken across the face of the duct, find an average value, and com- pare it to the minimum velocity shown on the heater nameplate.

The minimum air velocity refers to any point along the face of the duct heater when checking duct velocities, no velocity can be below that sown on the heater nameplate (remembering inlet air temperature). Velocities are best checked with an anemometer, tak- ing numerous readings along the horizontal and vertical centerline of the duct heater at the location prior to installation or slightly up stream from the heater after installation. (Refer to Figure 14). Large ducts will require additional readings taken at locations in addition to the centerline.

Duct Heater

Air

Flow

Velocity

 

 

Profile

Figure 14

Incoming Air Temperature: Incoming air temperature entering the duct heater must not exceed 100°F.

Example: 500 FT./MIN. Minimum Air Velocity on Heater Nameplate.

 

600

 

 

 

200x

 

500

 

 

 

400x

 

700

 

 

 

800

 

Velocity

600

Velocity

 

 

900

 

Profile

900

Profile

 

 

600

 

FT./MIN.

700

FT./MIN.

 

 

700

 

 

600

 

 

 

200x

 

500

 

 

 

300x

 

 

 

 

 

400x

RIGHT:

 

WRONG:

 

 

 

 

500 FT./MIN. MINIMUM

9

 

4500 = 500 FT./MIN. AVERAGE

 

 

X – below 500 FT./MIN.

 

 

-3-

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Chromalox PF455-3 manual AIR Flow

PF455-3 specifications

The Chromalox PF455-3 is a cutting-edge process feedback controller designed to optimize industrial heating applications. As part of Chromalox’s commitment to providing advanced heating solutions, the PF455-3 model stands out due to its robust features, precision control, and user-friendly design.

One of the main features of the PF455-3 is its versatile temperature control capabilities. It operates through a wide temperature range, accommodating various industrial processes that require precise thermal management. The controller employs advanced PID (Proportional, Integral, Derivative) control technology, allowing users to achieve optimal temperature settings with minimal fluctuations. This results in enhanced efficiency and productivity across heating applications.

The PF455-3 is equipped with a large, easy-to-read digital display that allows operators to monitor and adjust temperature settings effortlessly. The intuitive user interface simplifies navigation through various settings and configurations, ensuring that even less experienced personnel can operate the system with confidence. This feature significantly reduces the learning curve associated with similar devices, making it an ideal choice for diverse industries.

Additionally, the PF455-3 places a strong emphasis on safety and reliability. The device includes built-in alarm systems that notify users of any deviations from preset parameters, ensuring immediate action can be taken to prevent potential issues. The unit also features robust construction designed to withstand harsh industrial environments, providing longevity and minimizing downtime.

Moreover, the PF455-3 supports advanced communication technologies. It can be easily integrated into existing control systems via various communication protocols, including Modbus, which facilitates real-time data exchange and remote monitoring capabilities. This connectivity not only enhances operational oversight but also allows for proactive maintenance interventions.

In terms of energy efficiency, the PF455-3 excels by utilizing a unique energy-saving mode. This mode intelligently adjusts heating output based on process requirements, resulting in reduced energy consumption and lower operational costs. Users can expect significant savings on energy bills while maintaining process quality.

In summary, the Chromalox PF455-3 controller represents the forefront of industrial heating technology. With its advanced PID control, user-friendly interface, extensive safety features, and energy efficiency capabilities, it is a reliable choice for businesses looking to enhance their thermal processes. Whether in food processing, oil and gas, or chemical manufacturing, the PF455-3 stands out as a vital tool for achieving precise and efficient temperature control.