Chromalox CHPES-6A manual Testing Operation of Sequencer, Boiler Sequence Solid State

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OPTIONAL EQUIPMENT FOR STEAM BOILERS

IF A CONTROLLER SEEMS TO OPERATE IMPROPERLY If the controller is suspected of operating improperly, it may be

further checked as follows:

1.Leave the controller installed where it is, but disconnect all power to the boiler.

2.Loosen the cover screw below the main scaleplate and remove the cover.

3.Disconnect the wires from the controller.

4.Connect an ohmmeter between controller terminals B and W to measure the resistance of the potentiometer in the controller. The ohmmeter should read about 135 ohms on an L91B.

5.Connect the ohmmeter between controller terminals W and R and raise the set point of the controller above the actual pressure being measured. The ohmmeter should read the full value of the poten- tiometer measured in step 4 (135 ohms for an L91B).

6.Slowly lower the set point of the controller while observing the ohmmeter reading. The resistance should drop to zero at some set point below the actual pressure.

7.An approximation of the proportioning range can be made by observing the change in set point required for a resistance change from zero to full value.

8.When the controller is operating properly, reconnect the wires, replace the cover, tighten the cover screw, and reset the controller to the desired value.

9.Reconnect power to the controlled motor.

Main Scale

Proportioning Range

Adjusting

Screw

Adjusting Screw

Main Scale

 

R

 

 

W

Setting

 

B

Indicator

 

 

 

Sequencer (5-Step)

TESTING OPERATION OF SEQUENCER

1.With boiler off, remove wiring from pressure control on sequencer low voltage terminal board.

2.Turn on boiler to supply the voltage to the sequencer. Short ter- minal R and B for counterclockwise rotation and terminal R and W for clockwise rotation.

3.If sequencer operates under this test procedure, but when rewired to pressure controller and does not function, check pressure con- trol. Note that wiring is W-B and B-W-R-R between sequencer and pressure controller

BOILER SEQUENCE — SOLID STATE

Solid State Progressive Sequencer

The solid state progressive sequencer provides accurate elec- tronic control of multi-stage loads of the type used in Chromalox steam boilers. It features progressive sequencing (first on-first off) which equalizes the operating time of each load. This control gives visual indication of each energized stage by means of integral solid state light emitting diodes. In the event of power interruption, all heating elements are immediately de-energized for safety. When power resumes, the control will restage the loads one at a time.

Ohmmeter

Set Point

Increase

W R B

The solid state sequencer operates on 120V AC/60 Hz and each output is relay switched with a load rating of 125 VA at 120V AC.

The input to the sequencer is a 0-135 OHM potentiometer sup- plied on the operating pressure control. The sequencer has a sensi- tivity control which is adjustable from min. to max. This sensitivity control defines the amount of resistance (pressure) deviation allowed before adding or subtracting a load. Potentiometer resis- tance should decrease with increasing pressure. Connections are

Increases to

135 Ohms

Terminals are not Labeled, but Screw-Heads are

Color Coded Red (R), White (W) and Blue (B).

BOILER SEQUENCER (5 STEP) MOTOR DRIVEN RECYCLE FEATURE

The step control is designed to drop out all contactors when con- trol circuit is interrupted. On resumption of power, the camshaft rotates to the counterclockwise (ccw) limit, opening all the load switches. The recycle relay then energizes, pulling in the load con- tact, and finally the camshaft rotates clockwise (cw) to the position called for by the pressure controller energizing, in sequence, the required load stages.

made to red and white terminals of proportional pressure control. See Wiring Diagram 337-300164-452 for Boiler With Solid State Sequencer.

Solid State Sequencer

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Contents Chromalox Model CHPES-6A through CHPES-180A DimensionsModel InstallationTypical Wiring Diagrams WiringBlack Brown Red Orange Yellow Green Blue White Diagram Brown Red Orange Yellow Brown Red Orange Yellow Green Blue White Diagram Red Orange Miller LOW Water Cutoff Control PRE-OPERATION CheckHigh Limit Pressure Control Operation Adjusting Operating Pressure ControlsRecommended START-UP Procedures OperationIf Furnished Automatic Blowdown InstructionsOptional Equipment for Steam Boilers Solid State Progressive Sequencer Testing Operation of SequencerBoiler Sequencer 5 Step Motor Driven Recycle Feature Boiler Sequence Solid StateInstallation Water Feed SystemsHigh Pressure Feed Plumbing MaintenanceInstallation Wiring Condensate Return SystemsRead Completely Before Starting Work Renewal Parts IdentificationCondensate Return Systems Limited Warranty

CHPES-6A specifications

The Chromalox CHPES-6A is a advanced electric heating solution designed to meet the demands of various industrial applications. This equipment boasts exceptional performance, reliability, and efficiency, setting a high standard in the electric heating market.

One of the primary features of the CHPES-6A is its robust construction. Built to withstand challenging environments, it is made from high-quality materials that enhance durability while ensuring effective heat transfer. The unit is engineered to resist corrosion and damage, making it ideal for use in harsh conditions and industries.

The CHPES-6A leverages cutting-edge heating technologies that optimize energy consumption. It incorporates advanced digital controls that provide precise temperature management, enabling users to maintain consistent heating without wastage. This precision not only enhances operational efficiency but also contributes to energy savings over time.

One of the standout characteristics of the CHPES-6A is its compact design, which allows for easy installation in tight spaces where conventional heaters may not fit. Its lightweight nature further simplifies the setup process, reducing labor costs and time.

Moreover, the CHPES-6A features an intuitive user interface that streamlines operation. This modern control system includes programmable functions, allowing users to set specific heating schedules and customize temperature settings according to their operational needs.

Safety is paramount in the design of the CHPES-6A, with multiple integrated safety features. These include thermal protection mechanisms and diagnostic systems that alert operators to any potential issues, minimizing the risk of overheating and equipment failure.

The CHPES-6A is suitable for a vast range of applications, including process heating, fluid heating, and even comfort heating. Its versatility makes it a preferred choice across industries such as food processing, chemicals, and pharmaceuticals.

In summary, the Chromalox CHPES-6A stands out due to its exceptional durability, energy efficiency, and user-friendly interface. With its advanced heating technologies and robust safety features, it is designed to provide reliable performance in various demanding applications, making it an invaluable asset for any industrial operation.
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