EC7810A, EC7820A Relay Modules
GENERAL
The Honeywell EC7810/EC7820A Relay Module is a
microprocessor-based integrated burner control for
automatically fired gas, oil or combination fuel single burner
atmospheric (EC7810A) or atmospheric with fan (EC7820A)
applications. The EC7810A/EC7820A system consists of the
relay module, wiring subbase, amplifier and purge card. The
optional keyboard display module (KDM) can be mounted on
the relay module or on the face of a panel door. The KDM can
also be mounted remotely from the panel if this is approved
for the application.
The EC7810/EC7820 is programmed to provide a level of
safety, functional capability and features beyond the capacity
of conventional controls.
The basic functions of the EC7810/EC7820A include
automatic burner sequencing, flame supervision, system
status indication, system or self-diagnostics and
troubleshooting.
7800 SERIES
SPECIFICATION DATA
FEATURES
• Safety features:
— Interlock check.
— Dynamic AMPLI-CHECK™
— Closed loop logic test.
— Dynamic input check.
— Dynamic safety relay test.
— Dynamic self-check logic.
— Expanded safe-start check.
— Internal hardware status monitoring.
— Low Fire Start Switch test.
— Tamper resistant timing and logic.
• Ignition attempts: 1 or 5. Selectable by model number.
• Access for external electrical voltage checks.
• Application flexibility.
• Dependable, long-term operation provided by microcomputer
technology.
• First-out annunciation and system diagnostics provided by a
2 row by 20 column vacuum fluorescent display (VFD)
located on the KDM (optional).
• Five sequence information light emitting diodes (LED)with
symbols for Power, Pilot, Flame, Main and Alarm (see Fig. 1).
• Interchangeable plug-in flame amplifiers.
• Nonvolatile memory; EC7810/EC7820 retain history files and
sequencing status after loss of power.
• Remote reset (subject to application approval; optional).
• Remote mounting of KDM (subject to application approval).
• Burner control data available on the optional KDM:
— Flame signal strength.
— Hold status.
— Lockout/alarm status.
— Sequence status.
— Sequence time.
— Total cycles of operation.
— Total hours of operation.
— Fault history providing the six most recent faults:
• Cycles of operation 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 (FFRT).
• Manufacturing code.
• On/off status of all digital inputs and outputs.
• Selected prepurge time.
• Software revision and version of relay module and
optional KDM.
• Status of configuration jumper.
• Status of Run/Test Switch.
® U.S. Registered Trademark
Copyright © 1998 Honeywell Inc. • All Rights Reserved
66-2040
7800 SERIES EC7810A, EC7820A RELAY MODULES
BURNER CONTROL
1
127
127
REMOVE ONLY FOR TERMINAL TEST ACCESS.
1
133
Fig. 1 Mounting dimensions of relay module and wiring subbase in millimeters only.
SPECIFICATIONS
Table 1A. EC7810A Terminal Ratings.
Terminal No. Abbreviation Description Ratings
G Flame Sensor Ground
Earth G Earth Ground
a
N Line Voltage Common
(Neutral)
3 L1 Line Voltage Supply (L1) 220-240 Vac (+10%/-15%), 50/60 Hz (±10%).
4 AL Alarm (Normally Open) 220/230/240 Vac, 1A, 10A inrush for 5000 cycles.
6 RT Limits and Burner Control 220/230/240 Vac, 5A (maximum).
7 LD2 Airflow Switch Input 220/230/240 Vac, 1 mA.
8 PV1 Pilot Valve 1 (interrupted) 220/230/240 Vac, 4A at PF = 0.5, 20A inrush.
9 MV Main Fuel Valve 220/230/240 Vac, 4A at PF = 0.5, 20A inrush.
10 IGN Ignition 220/230/240 Vac, 4A at PF = 0.2.
F(11) Flame Signal 136 to 220 Vac, current limited.
13 COM Firing Rate Common 220/230/240 Vac, 4A at PF = 0.5.
14 MOD Firing Rate Modulate 220/230/240 Vac, 4A at PF = 0.5.
16 Control Voltage 220-240 Vac (+10%/-15%).
17 ES2 Preignition Interlock Input 220/230/240 Vac, 1 mA.
18 ES1 Low 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.
22 SHTR Shutter 220-240 Vac, 0.25A.
a
See Table 2.
b
2000 VA maximum connected load to 7800 SERIES Relay Module Assembly.
c
Total load current, excluding burner/boiler motor and firing rate outputs cannot exceed 5A, 25A inrush.
d
Can also be 24 Vac, 3A at PF = 0.5.
e
220-240 Vac to 120 Vac, 10 VA (minimum) stepdown transformer (not provided) required to drive shutter.
a
e
M12821
b
c
c
c
d
d
c
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7800 SERIES EC7810A, EC7820A RELAY MODULES
Table 1B. EC7820A Terminal Ratings.
Terminal No. Abbreviation Description Ratings
G Flame Sensor Ground
Earth G Earth Ground
a
N Line Voltage Common (Neutral)
3 AL Alarm (Normally Open) 220/230/240 Vac, 1A, 10A inrush for 5000 cycles.
4 FAN Burner/Blower Motor 220/230/240 Vac, 4A at P.F. = 0.5, 20A inrush.
5 L1 Line Voltage Supply (L1) 220-240 Vac (+10%/-15%), 50/60 Hz (±10%).
6 RT Limits and Burner Control 220/230/240 Vac, 5A (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.
9 MV Main Fuel Valve 220/230/240 Vac, 4A at P.F. = 0.5, 20A inrush.
10 IGN Ignition 220/230/240 Vac, 4A at P.F. = 0.2.
F(11) Flame Signal 135 to 220 Vac, current limited.
13 COM Firing Rate Common 220/230/240 Vac, 4A at P.F. = 0.5.
14 MOD Firing Rate Modulate 220/230/240 Vac, 4A at P.F. = 0.5.
16 Control Voltage 220-240 Vac (+10%/-15%).
17 ES2 Preignition Interlock Input 220/230/240 Vac, 1 mA.
18 ES1 Low 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.
22 SHTR Shutter 220-240 Vac, 0.25A.
a
See Table 2.
b
2000 VA maximum connected load to 7800 SERIES Relay Module Assembly.
c
Total load current, excluding burner/boiler motor and firing rate outputs cannot exceed 5A, 25A inrush.
d
Can also be 24 Vac, 3A at PF = 0.5.
e
220-240 Vac to 120 Vac, 10 VA (minimum) stepdown transformer (not provided) required to drive shutter.
a
e
b
c
c
c
d
d
c
Table 2. Recommended grounding practices.
Ground type Recommended Practice
Earth ground (subbase and relay module). 1. Use to provide a connection between the subbase and the control panel of
the equipment. Earth ground must be capable of conducting enough current
to blow the 20A fuse (or breaker) in the event of an internal short circuit.
2. Use wide straps or brackets to provide minimum length, maximum surface
area ground conductors. If a leadwire must be used, use 14 AWG copper
wire.
3. Make sure that mechanically-tightened joints along the ground path are free
of nonconductive coatings and protected against corrosion on mating
surfaces.
Signal ground (KDM, Data ControlBus
Module™, Communications Interface
ControlBus™ Module).
Use the shield of the signal wire to ground the device to the signal ground
terminal 3(c) of each device. Connect the shield at both ends of the daisy chain
to earth ground.
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66-2040
7800 SERIES EC7810A, EC7820A RELAY MODULES
Table 3. Sequence Timing for Normal Operation.
Device Initiate Standby
Purge or
Waiting Preignition
First
Safety
Time
Pilot
Stab.
Main
Trial
Time***
Main
Stab. Run
Ignition
Attempts
EC7810A1027 2 sec * ** 3 sec 5 or 10 sec 5 sec 5 or 8 sec 5 sec * 1
EC7810A1035 2 sec * ** 3 sec 5 or 10 sec 5 sec 5 or 8 sec 5 sec * 5
EC7820A1026 2 sec * ** 3 sec 5 or 10 sec 5 sec 5 or 8 sec 5 sec * 1
EC7820A1034 2 sec * ** 3 sec 5 or 10 sec 5 sec 5 or 8 sec 5 sec * 5
* Standby and Run can be an infinite period.
** Waiting Time is determined by the ST7800A Purge Card selected.
*** Second Safety Time is Main Trial Time plus Flame Failure Response Time.
Electrical Ratings (See Tables 1A and 1B):
Voltage and Frequency: 220 to 240 Vac (+10%/-15%),
50/60 Hz (±10%).
Keyboard Display Module (Optional): 13 Vdc peak
fullwave rectified (+20%/-15%).
Oil Approvals:
EC7810A1027: DIN-5F104/96.
EC7820A1026: DIN-5F105/96.
EN298: “Automatic gas burner systems for gas burners
and gas burning appliances with or without fans.”
Power Dissipation:
Relay Module: 10W maximum.
KDM: 3W maximum.
Maximum Total Connected Load: 2000 VA.
Fusing (Total Connected Load): 20A, type FRN or
equivalent.
Please note the following to comply with EN60730 for remote
mounting of the KDM and/or remote reset. It is necessary to
provide electrical separation using insulation at least
equivalent to double or reinforced insulation. Accomplish this
by either:
• Optically isolating the communication and/or remote
Environmental Ratings:
Ambient Temperatures:
Operating: -40°C to 60°C (-40°F to 140°F).
Storage: -40°C to 66°C. (-40°F to 150°F).
Humidity: 85% RH continuous, noncondensing.
Vibration: 0.5G environment.
reset lines from the control cabinet or
• Providing physical separation from the communication
and/or remote reset lines using electrical conduit and a
remote display cover assembly (part no. 204718A) or
other suitable enclosure that meets IP40 class of
protection.
Dimensions:
See Fig. 1 and 2.
Weight:
Relay Module: 0,730 kg unpacked.
KDM: 0,113 kg unpacked.
IMPORTANT
Flame Detection System available for use with
EC7810/EC7820. Select your plug-in Flame Signal
Amplifier and applicable Flame Detector from Table 4.
Approvals:
This product complies with the following European directives:
Gas Appliance Directive (90/269/EEG).
Low Voltage Directive (73/23/EEG).
EMC Directive (89/336/EEG).
GASTEC (CE-63AP3070/1).
Factory Mutual: J.I.0Y0A9.AF.
Mounting:
Q7800A Wiring Subbase for Panel Mount: To meet EN60730
requirements, mount the relay module in a secured panel
which meets IP40 class of protection.
Required Components:
Plug-in Flame Signal Amplifier: See Table 2.
ST7800A Plug-in Purge Timer Cards: Selectable from two
seconds to 30 minutes.
Q7800A Wiring Subbase.
Accessories:
Keyboard Display Modules (KDM) (Optional):
S7800A1001 English language.
S7800A1035 French language.
S7800A1043 German language.
S7800A1050 Italian language.
S7800A1068 Spanish language.
S7800A1118 Katakana (Japanese) language.
S7800A1126 Portuguese language.
S7800B1009 Chinese language.
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7800 SERIES EC7810A, EC7820A RELAY MODULES
Communications:
Q7700B1004 Network Interface Unit with universal 100 to
250 Vac, 50/60 Hz external power supply, external
modem required.
QS7800A1001 ControlBus Module, standard.
QS7800B1000 ControlBus Module, multidrop.
QS7800C1009 ControlBus Module, data acquisition
modules.
QS7800D1008 ControlBus Module, Armstrong.
QS7800E1007 ControlBus Module, Pulsafeeder.
QS7850A1006 ControlBus Module, General Purpose
Interface.
ZM7850A1001 Combustion System Manager™ Software.
ZM7850B1000 SYSNet™ Facilities Integration Software.
S7810A1009 Data ControlBus™ Module (if no KDM is
Miscellaneous:
S7820A1007 Remote Reset Module.
203541 Data ControlBus Connector, 5-wire.
203765 Remote Display Mounting Bracket.
221729 Relay Module Dust Cover.
204718A Keyboard Display Module Cover, NEMA 4, clear.
204718B Keyboard Display Module Cover, NEMA 1, clear.
204718C Keyboard Display Module Cover, NEMA 4, clear
with reset button.
205321B Flush Display Mounting Kit.
221818A Extension Cable, display, (1524 mm).
221818C Extension Cable, display, (3048 mm).
123514A Rectification Flame Simulator.
203659 Ultraviolet Flame Simulator.
203968A Remote Display Power Supply, 13 Vdc, plug-in.
used).
S7810B1007 Data ControlBus™ Module, Multi-Drop
Switch Module.
Table 4. Flame Detection System
Plug-in Flame Signal Amplifiers Applicable Flame Detectors
Flame Failure
Response
Type Color Self-Checking Model
Rectification Green No R7847A 1 or 2 sec
No R7847A 1 or 2 sec
Dynamic
R7847B 1 or 2 sec
Ampli-Check™
Dynamic
R7847B 1 or 2 sec
Ampli-Check™
Ultraviolet Purple No
c
Dynamic
R7849A 1 or 2 sec
R7849B 1 or 2 sec
Ampli-Check™
Dynamic
R7861A
c,f
Self-Check
Blue Dynamic
R7886A
c,f
Self-Check
Time Fuel Type Models
maximum.
maximum.
maximum.
maximum.
maximum.
maximum.
1 or 2 sec
Gas Rectifying
Flame Rod
Holders
a
Oil Rectifying
Photocell
Gas Rectifying
Flame Rod
Holders
a
Oil Rectifying
Photocell
d
Gas, oil Ultraviolet
(Minipeeper)
Gas, oil Ultraviolet
(Minipeeper)
Gas, oil Ultraviolet C7061.
C7004, C7007, C7011.
Complete Assemblies:
C7008, C7009, Q179.
C7003, C7010, C7013,
b
C7014.
C7004, C7007, C7011.
Complete Assemblies:
C7008, C7009, Q179.
C7003, C7010, C7013,
b
C7014.
C7027,C7035, C7044d.
C7027,C7035, C7044d.
g
maximum.
2 sec
maximum.
Gas, oil,
coal
Ultraviolet
(Adjustable
C7076.
g
Sensitivity)
a
Order flame rod separately; see holder instructions.
b
Use only Honeywell Photocell part number 38316.
c
Dynamic Self-Check ultraviolet amplifiers should be used only on burners that cycle on-off at least once every 24 hours.
Appliances with burners that remain on continuously for 24 hours or longer should use C7061A Flame Detector with R7861A
Amplifier.
d
C7027, C7035 and C7044 Flame Detectors should be used only on burners that cycle on-off at least once every 24 hours.
Appliances with burners that remain on continuously for 24 hours or longer should use C7061A Flame Detector with R7861A
Amplifier as ultraviolet flame detection system.
e
Circuitry tests the flame signal amplifier at least 12 times a minute during burner operation and shuts down the boiler if the
amplifier fails.
f
Circuitry tests all electronic components in the flame detection system (amplifier and detector) 12 times a minute during
burner operation and shuts down the burner if the detection system fails.
g
A 220/240 Vac to 120 Vac 10 VA step-down transformer (not provided) must be used to drive the shutter.
5
66-2040
7800 SERIES EC7810A, EC7820A RELAY MODULES
66-2040
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7800 SERIES EC7810A, EC7820A RELAY MODULES
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66-2040
7800 SERIES EC7810A, EC7820A RELAY MODULES
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66-2040
66-2040 G.R. 3-98
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