EC7850A1072

Product Description

The Honeywell EC7830A or EC7850A Relay Module is a microprocessor based integrated burner control for automatically fired

gas, oil, or combination fuel single burner full modulation (EC7850A) or on/off (EC7830A) power burner applications. The EC7830A or EC7850A consists of a Relay Module. Subbase, Amplifier, and Purge Card are required to complete the system. The Keyboard Display, which is optional, can be mounted on the Relay Module or on the face of a panel door. The Keyboard Display can also be mounted remotely from the panel, provided this is approved for the application.

The Honeywell 7800 SERIES is programmed to provide a level of safety, functional capability and features beyond the capacity of conventional controls.

Functions provided by the 7800 SERIES include automatic burner sequencing, flame supervision, system status indication, system or self-diagnostics and troubleshooting. Text readout for the Keyboard Display Module is available in English, Spanish, Portuguese, French, German and Italian languages.

FEATURES

• Safety features:

- Interlock check.

- Closed loop logic test.

- Dynamic AMPLI-CHECK™

- Dynamic input check.

- Dynamic safety relay test.

- Dynamic self-check logic.

- Expanded safe-start check.

- High Fire Purge Switch test (EC7850A).

- Internal hardware status monitoring.

- Low Fire Start Switch test (EC7850A).

- Tamper resistant timing and logic.

• First-out annunciation and system diagnostics provided by a 2 row by 20 column Vacuum Fluorescent Display (VFD) located on the Keyboard Display Module. Text readout for this unique Keyboard Display Module is available in English, Spanish, Portuguese, French, German and Italian languages.

• Access for external electrical voltage checks.

• Application flexibility.

• Dependable, long-term operation provided by microcomputer technology.

• Five sequence information Light Emitting Diodes (LEDs)- Power, Pilot, Flame, Main, Alarm (see Fig. 17).

• Five function Run/Test Switch.

• Interchangeable plug-in flame amplifiers.

• Nonvolatile memory for retaining history files and sequencing status after loss of power.

• Remote mounting of the Keyboard Display Module (subject to application approval).

• Remote reset (subject to application approval).

• Burner controller data available on the Keyboard Display

Module:

- Sequence status.

- Sequence time.

- Hold status.

- Lockout/alarm status.

- Flame signal strength.

- Total cycles of operation.

- Total hours of operation.

- Fault history of six most recent faults:

• Cycles of operation at time of fault.

• Fault message and code.

• Hours of operation at time of fault.

• Sequence status at time of fault.

• Sequence time at time of fault.

- Diagnostic information:

• Device type.

• Flame amplifier type.

• Flame failure response time.

• Manufacturing code.

• On/Off status of all digital inputs and outputs.

• Selected prepurge time.

• Software revision and version of Relay Module and Keyboard Display Module.

• Status of configuration jumpers.

• Status of Run/Test Switch.
Terminal Ratings for EC7850A

¹ The EC7850A must have an earth ground providing a connection between the subbase and the control panel or the equipment. The earth ground wire must be capable of conducting the current to blow the 20A fuse in event of an internal short circuit. It is recommended that the EC7850A have a low impedance ground connection to the equipment frame which, in turn, needs a low impedance connection to earth ground. For a ground path to be low impedance at RF frequencies, the connection must be made by minimum length conductors having maximum surface areas. Wide straps or brackets are preferred rather than leadwires. Be careful to ensure that mechanically tightened joints along the ground path, such as pipe or conduit threads or surfaces held together with fasteners, are free of nonconductive coatings and are protected against mating surface corrosion.

^{2 2000 VA maximum connected load to EC7850A Assembly.}

^{3 Total load current, excluding Burner/Boiler Motor and Firing Rate Outputs cannot exceed 5A, 25A inrush.}

^{4 Can also be 24 Vac, 3A at P.F. = 0.5.}

^{5 50/60 Hz frequency selection by OS number.}

Sequence Timing for Normal Operation

* STANDBY and RUN can be an infinite time period.

** Waiting Time will be determined by which ST7800A purge card is selected.

*** Second Safety Time is Main Trial Time plus Flame Failure Response Time.

^{a Dynamic Damper Check.}

^{b 60 Hz models.}

BNSENS (Nanjing) Sensor Technology Co., Ltd. is located in Nanjing, China. It is a high-tech enterprise specializing in the development, manufacturing and trade of sensor products. The company has brought together a group of outstanding technical experts in various fields such as automation, electronics, machinery and computers. All employees of the company have college degrees or above. It adopts the world-class management and operation model and 6 sigma quality system. At present, the company's main products are pressure, liquid level, flow, current, switches, etc. The company's users are all over the country, and some products have been exported to Japan, South Korea and Southeast Asia.

Since its inception, the company has been based on the technical accumulation and management standards of American sensor giants. It is composed of senior engineers and managers who have served in multinational companies for many years, and has rapidly developed various pressure sensors, transmitters, liquid level, flow meters, pressure switches, digital meters, current sensors, proximity switches and other products. After years of unremitting efforts, it has become one of the leading suppliers in the domestic automation industry. Our pressure transmitters can achieve an accuracy of more than 3/10, 000. The products have been widely used in oil, natural gas, electricity, chemical industry, metallurgy, building materials, food, light industry, environmental protection, aerospace, tap water, municipal and other industries.

It is a sensor science and technology innovation company that masters the core technology of MEMS chips. The company has a research and development center in Minnesota, USA. The leader is Dr. Pan Hanjin, a famous scientist in the sensor industry. Dr. Pan Hanjin has been deeply involved in the sensor industry for more than 20 years and is an expert in the sensor industry.

The company has a number of ASIC chips independently developed, which are widely used in industrial, automotive, home appliance and other markets.

BNSENS (Nanjing) Sensing Technology Co., Ltd. is a strategic partner of Honeywell in China. The two parties proposed a plan of East serving East and jointly developed several sensors specifically for the Chinese market. These sensors will be widely used in intelligent manufacturing, Internet of Things, artificial intelligence, and smart home fields. These sensors include: Magnetic sensors, temperature sensors, humidity sensors, force sensors, fire water pressure sensors, equipment vibration sensors, human body status monitoring sensors, motion sensors, etc.

History of BNSENS Company:

BNSENS is a company focusing on sensors, instruments, and electronic components. We are a young company, founded in 1999, just 25 years old, and we are still growing.

1999: The company's first pressure sensor was launched, mainly for the petroleum and petrochemical industries.

2002: The company expanded its product line and launched temperature sensors

2005: Started producing high-precision pressure sensors for the test and measurement market

2006: Became an official authorized agent of Honeywell

2009: Introduced the Six Sigma management system, and the product qualification rate was greatly improved

2010: Became a supplier of Emerson

2011: We started selling SICK sensors

2014: Introduced the sensor production line from Germany, developed more industrial control sensors, and cooperated with TSMC

2015: Cooperated with Siemens in Vietnam

2017: The factory moved to Nanjing High-tech Zone

2019: Became a national high-tech enterprise in China

2023: We started selling products from Infineon and Rohm

BNSENS, The Future Starts Here.