The Honeywell RM7840 is a microprocessor based integrated burner control for automatically fired gas, oil or combination fuel single burner applications. The RM7840 system consists of a Relay Module, Subbase, Amplifier and Purge Card. Options include Keyboard Display Module, Modbus Module™, DATA CONTROLBUS MODULE™, Remote Display Mounting, and First-Out Expanded Annunciator.
The RM7840 is programmed to provide a level of safety, functional capability and features beyond the capacity of conventional controls.
Functions provided by the RM7840 include automatic burner sequencing, flame supervision, system status indication, system or self-diagnostics and troubleshooting.
RM7840G1022, RM7840L1075, RM7840L1091 and EC7840L1014 offer Valve Proving Feature.
RM7840L1091 has a 4 second main flame establishing period.
Using the S7800A1142 Keyboard Display (standard on RM7800L1087) the following features can be set up:
• Post Purge time-Up to 60 minutes-Device shipped with 15 seconds Post purge.
• Valve Proving features including:
- VPS test time
- When (Never, Before, After, Split or Both)
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.
- Internal hardware status monitoring.
- Low Fire Start Switch test.
- Tamper resistant timing and logic.
• Access for external electrical voltage checks.
• Application flexibility.
• 0.8 or 3.0 second Flame Failure Response Time (FFRT), depending on amplifier selected.
• Communication interface capability using Modbus.
• Dependable, long-term operation provided by microcomputer technology .
• First-out annunciation and system diagnostics are provided by an optional 2 row by 20 column Vacuum Fluorescent Display (VFD) located on the Keyboard Display Module (optional).
• First-out expanded annunciation with 26 Light Emitting Diodes (LEDs) for limits and interlocks (optional).
• Five LEDs for sequence information. See Fig. 1.
• Five function Run/Test Switch. • Interchangeable plug-in flame amplifiers.
• Local or remote annunciation of RM7840 operation and fault information (optional).
• Nonvolatile memory RM7840 retains history files and sequencing status after loss of power.
• Remote reset (optional).
• Burner controller data (optional):
- Expanded annunciator status.
- Flame signal strength.
- Hold status.
- Lockout/alarm status.
- Sequence status.
- Sequence time.
- Total cycles of operation.
- Total hours of operation.
- Fault history, providing for the six most recent faults:
• Cycles of operation at the time of the fault.
• Expanded annunciator data at the time of the fault.
• Fault message and code.
• Hours of operation at the time of the fault.
• Sequence status at the time of the fault.
• Sequence time at the time of the 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
Specification
Electrical Ratings (See Table 1):
Voltage and Frequency: 120 Vac (+10/-15%), 50 or 60 Hz (+/- 10%).5
Power Dissipation: RM7840: 10W maximum.
Maximum Total Connected Load: 2000 VA.
Fusing: Total Connected Load: 15A fast blow, type SC or equivalent.
Environmental Ratings:
Ambient Temperature:
Operating: -40°F to 140°F (-40°C to 60°C).
Storage: -40°F to 150°F (-40°C to 66°C).
Humidity: 85% RH continuous, noncondensing.
Vibration: 0.5G environment.
Weight: RM7840 with Dust Cover: 1 pound 13 ounces, unpacked.
Dimensions: See Fig. 2.
Approval Bodies:
Underwriters Laboratories Inc. listed, File No. MP268, Guide No. MCCZ.
Canadian Standards Association certified, LR9S329-3.
Factory Mutual approved: Report No. 1V9A0.AF.
SwissRe (formerly IRI) acceptable.
Federal Communications Commission: Part 15, Class A-Emissions.
Mounting: Q7800A for panel mount or Q7800B for wall or burner mount.
Required Components:
Plug-in Flame Signal Amplifier, see Table 2.
ST7800A:
Plug-in Purge Timer Cards: selectable two seconds to 30 minutes.
Q7800A or Q7800B Wiring Subbase.
Accessories:
Keyboard Display Modules (KDM):
S7800A1001 English language.
S7800A1035 French language.
S7800A1043 German language.
S7800A1050 Italian language.
S7800A1068 Spanish language.
S7800A1118 Katakana (Japanese) language.
S7800A1126 Portuguese language.
S7800A1142 English language (to program VPS feature).
S7800A1167 Spanish language (to program VPS feature).
Communications:
S7810A1009 Data ControlBus™ Module
S7810M1003 ModBus™ Module.
Miscellaneous:
A7800A1010 7800 SERIES Tester.
S7820A1007 Remote Reset Module.
S7830A1005 Expanded Annunciator, 120 Vac, 50/60 Hz.
203541 Data ControlBus Connector, 5-wire.
203765 Remote Display Mounting Bracket.
221729 Dust Cover, Relay Module.
50023821-001 Keyboard Display Module Cover, NEMA 4, clear.
204718B Keyboard Display Module Cover, NEMA 1, clear.
50023821-002 Keyboard Display Module Cover, NEMA 4, clear with reset button.
205321B Flush Display mounting kit.
221818A Extension Cable, display, 5 ft (1524 mm).
221818C Extension Cable, display, 10 ft (3048 mm).
123514A Rectification Flame Simulator.
203659 Ultraviolet Flame Simulator.
https://bnsens.en.made-in-china.com/product/NfTUhjyAXbVp/China-Honeywell-Midas-Gas-Detector-MIDAS-K-O3X.html
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.
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