Honeywell EC7820A User Manual
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
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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
66-2040
2
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.
3
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