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
| Terminal No. |
Abbreviation |
Description |
Ratings |
| G |
- |
Flame Sensor Ground 1 |
- |
| Earth G |
- |
Earth Ground1 |
- |
| N |
- |
Line Voltage Common
(Neutral) |
- |
| 3 |
AL |
Alarm (Normally Open) |
220/230/240 Vac, 1A, 10A inrush for 5000 cycles. |
| 4 |
L1 |
Line Voltage Supply (L1) |
220-240 Vac (+10/-15%), 50/60 Hz (+/- 10%). 2,5 |
| 5 |
FAN |
Burner/Blower Motor |
220/230/240 Vac, 4A at P.F. = 0.5, 20A inrush. |
| 6 |
RT |
Limits and Burner Control |
220/230/240 Vac, 5 A (maximum). |
| 7 |
LD2 |
Airflow Switch Input |
220/230/240 Vac, 1 mA. |
| 8 |
PV1 |
Pilot Valve 1 (Interrupted) |
220/230/240 Vac, 4A at P.F. = 0.5, 20A inrush.3 |
| 9 |
MV |
Main Fuel Valve |
220/230/240 Vac, 4A at P.F. = 0.5, 20A inrush.3 |
| 10 |
IGN |
Ignition |
220/230/240 Vac, 2A at P.F. = 0.2.3 |
| F(11) |
- |
Flame Signal |
136 to 220 Vac, current limited. |
| 12 |
HI |
Firing Rate High Fire |
220/230/240 Vac, 0.5A at P.F. = 0.5.4 |
| 13 |
COM |
Firing Rate Common |
220/230/240 Vac, 0.5A at P.F. = 0.5.4 |
| 14 |
MOD |
Firing Rate Modulate |
220/230/240 Vac, 0.5A at P.F. = 0.5.4 |
| 15 |
LO |
Firing Rate Low Fire |
220/230/240 Vac, 0.5A at P.F. = 0.5.4 |
| 16 |
- |
Control Voltage |
230 Vac (+15/-19%)2 |
| 17 |
ES2 |
Preignition Interlock Input |
220/230/240 Vac, 1 mA. |
| 18 |
ES1 |
Low Fire Switch Input |
220/230/240 Vac, 1 mA. |
| 19 |
ES3 |
High Fire Switch Input |
220/230/240 Vac, 1 mA. |
| 20 |
LOS |
Lockout Input |
220/230/240 Vac, 1 mA. |
| 21 |
PV2 |
Pilot Valve 2 (Intermittent) |
220/230/240 Vac, 4A at P.F. = 0.5, 20A inrush.3 |
| 22 |
SHTR |
Shutter |
Shutter Drive for Dynamic Self-Check flame sensor. |
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.
Accessories:
Optional:
ControlBus 5-Wire Electrical Connector-part no.203541.
Dust Cover-part no. 221729.
Flame Simulators:
- part no. 203659 UV Flame Simulator.
- part no. 123514A Rectification Simulator.
Keyboard Display Module:
- part no. S7800A1001 English language display
- part no. S7800A1035 French language display
- part no. S7800A1043 German language display
- part no. S7800A1050 Italian language display
- part no. S7800A1068 Spanish language display
- part no. S7800A1126 Portuguese language display
DATA CONTROLBUS MODULE™ - part no. S7810A1009.
Remote Reset Module-part no. S7820A1007.
Remote Display Mounting Bracket-part no. 203765.
1.5 meter Extension Cable Assembly-part no.221818A.
NEMA 4 Cover Assembly for S7800A
Keyboard Display Module-part no. 204718A.
Sequence Timing for Normal Operation
| Device |
Initiate |
Standby |
Purge or
Waiting |
Preignition |
First Safety
Time |
Pilot
Stab. |
Main Trial
Time*** |
Main
Stab. |
Run |
| EC7830A1033 |
2 sec |
* |
** |
3 sec |
3 or 5 sec |
5 sec |
3 or 5 sec |
5 sec |
* |
| EC7830A1041 |
2 sec |
* |
** |
3 sec |
3 or 5 sec |
5 sec |
3 or 5 sec |
5 sec |
* |
| EC7830A1066 |
2 sec |
* |
** |
3 sec |
3 or 5 sec |
5 sec |
3 or 5 sec |
5 sec |
* |
| EC7850A1064 a |
2 sec |
* |
** |
3 sec |
3 or 5 sec |
5 sec |
3 or 5 sec |
5 sec |
* |
EC7850A1072
EC7850A1072/U |
2 sec |
* |
** |
3 sec |
3 or 5 sec |
5 sec |
3 or 5 sec |
5 sec |
* |
| EC7850A1080b |
2 sec |
* |
** |
3 sec |
3 or 5 sec |
5 sec |
3 or 5 sec |
5 sec |
* |
| EC7850A1106b |
2 sec |
* |
** |
3 sec |
3 or 5 sec |
5 sec |
3 or 5 sec |
5 sec |
* |
| EC7850A1114 |
2 sec |
* |
** |
3 sec |
3 or 5 sec |
5 sec |
3 or 5 sec |
5 sec |
* |
EC7850A1122
EC7850A1122/U |
2 sec |
* |
** |
3 sec |
3 or 5 sec |
5 sec |
3 or 5 sec |
5 sec |
* |
* 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.
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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.
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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
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