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EC7820A 7800 SERIES RELAY MODULES
IMPORTANT
To comply with EN60730 for remote mounting of the
display and/or remote reset, provide electrical sepa-
ration using insulation at least equivalent to double or
use reinforced insulation. Accomplish this by opti-
cally isolating the communication and/or remote
reset lines from the control cabinet, or providing
physical separation from the communication and/or
remote reset lines using electrical conduit and part
number 204718A Remote Display Cover Assembly
or other suitable enclosure that meets IP40 class of
protection.
IMPORTANT
A Flame Detection System is required for operation
and must be ordered separately. Select the applica-
ble Flame Signal Amplifier and matching Flame
Detector from form number 65-0109.
INSTALLATION
When Installing this Product...
1.
Read these instructions carefully. Failure to follow them
could damage the product or cause a hazardous condi-
tion.
2. Check the ratings given in the instructions and marked
on the product to make sure the product is suitable for
the application.
3. Installer must be a trained, experienced, flame safe-
guard service technician.
4. After installation is complete, check out the product
operation as provided in these instructions.
WARNING
Explosion or Fire Hazard. Can cause severe injury,
death or property damage.
Observe applicable local safety requirements each time a
control is installed on a burner.
WARNING
Electrical Hazard or Equipment Damage Hazard.
Can cause electrical shock or equipment and
control damage.
Disconnect the power supply before beginning installation.
More than one power supply disconnect may be required.
66-1091—08
IMPORTANT
1. Wiring connections for the relay modules are unique;
refer to Fig. 2 and 3 or the correct Specifications for
proper subbase wiring.
2. Wiring must comply with all applicable codes, ordi-
nances and regulations.
3. Wiring must comply with NEC Class 1 (Line Voltage)
wiring.
4. Loads connected to the 7800 SERIES Relay Module
must not exceed those listed on the 7800 SERIES
Relay Module label or the Specifications;
see Table 4.
5. Limits and interlocks must be rated to simultaneously
carry and break current to the ignition transformer,
pilot valve, and main fuel valve(s).
6. All external timers must be listed or component rec-
ognized by authorities who have proper jurisdiction.
7. For on-off gas-fired systems, some authorities who
have jurisdiction prohibit the wiring of any limit or
operating contacts in series between the flame safe-
guard control and the main fuel valve(s).
8. Two Flame Detectors can be connected in parallel
with the exception of C7015 or C7915 Infrared Flame
Detectors C7927, C7961 Ultraviolet Flame Detector,
and C7962 Visible Light Detector.
9. This equipment generates, uses and can radiate
radio frequency energy and, if not installed and used
in accordance with the instructions, can cause inter-
ference with radio communications. The EC7820A
complies with the requirements of EN 50081 (Euro-
pean Radiated Emission Standard). It has been
tested and found to provide reasonable protection
against such interference when operated in a com-
mercial environment. Operation of this equipment in
a residential area may cause interference; in which
case, the users at their own expense may be
required to take whatever measures are required to
correct this interference.
10.This digital apparatus complies with the require-
ments of EN 50081 (European Radiated Emission
Standard).
See Fig. 1 for the internal block diagrams of the EC7820A
Relay Modules.
Location
Humidity
Install the relay module where the relative humidity never
reaches the saturation point. The relay module is designed to
operate in a maximum 85 percent relative humidity
continuous, noncondensing, moisture environment.
Condensing moisture may cause a safety shutdown.
Vibration
Do not install the relay module where it could be subjected to
vibration in excess of 0.5G continuous maximum vibration.
Weather
The relay module is not designed to be weather tight. When
installed outdoors, the relay module must be protected by an
approved weather-tight enclosure.
2
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