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EC7820A 7800 SERIES RELAY MODULES
Run/Test Switch
The Run/Test Switch is located on the top side of the 7800
SERIES Relay Module, see Fig. 4. The Run/Test Switch
1. In the measured PURGE sequence, the Run/Test
Switch, when placed in the TEST position, causes the
PURGE timing to stop.
2. During the PILOT STAB. period, the Run/Test Switch,
when placed in the TEST position, stops the timer,
allowing for pilot turn-down test and other burner adjust-
ments. This activates a fifteen-second flameout timer
that permits pilot flame adjustment without nuisance
safety shutdowns.
3. During Run, the Run/Test Switch, when placed in the
TEST position, drives the firing rate motor to the OPEN
position.
NOTE: When the 7800 SERIES Relay Module is switched
to the TEST mode, it stops and holds at the next
Run/Test Switch point in the operating sequence.
Make sure that the Run/Test Switch is in the RUN
position before leaving the installation.
SETTINGS AND ADJUSTMENTS
Selectable Site-Configurable Jumpers
The EC7820A Relay Module has three site-configurable
jumper options, see Fig. 4 and Table 5. If necessary, clip the
site configurable jumper with side cutters and remove the
resistors from the relay module. The relay module reads the
settings of these configuration jumpers at startup. After 200
hours of main valve operation, the relay module locks the
jumper settings into internal memory. If these jumpers are
changed after the lockin occurs, the relay module will lock out.
This safety function assures that the relay module cannot be
modified after it is installed in a particular location.
If JR3 (Airflow Switch) is intact (no Airflow Switch), then a
jumper must be installed between terminals 6 and 7 of the
wiring subbase. If jumper JR3 is clipped (Airflow Switch is
present), the relay module locks out if it detects a jumper
between terminals 6 and 7.
NOTE: Clipping and removing a site-configurable
jumper enhances the level of safety
CAUTION
Equipment Shutdown Hazard. Improper procedure
causes lockout.
Clipping and removing a Site Configurable Jumper after 200
hours of operation results in a hard lockout (Code 110)
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
customer.honeywell.com
RUN/TEST SWITCH
Fig. 4.
Selectable site-configurable jumpers.
Table 5. Site configurable jumper options.
Jumper
Number
Description
JR1
First Safety Time
JR2
Main Trial Time
JR3
Airflow Switch
WARNING
Explosion Hazard.
Can cause serious injury or death.
Be sure all manual fuel shutoff valves are closed.
® U.S. Registered Trademark
© 2013 Honeywell International Inc.
66-1091—08
M.S. Rev. 08-13
Printed in United States
SELECTABLE CONFIGURATION
JUMPERS
M7701C
Intact
Clipped
10 seconds
5 seconds
8 seconds
5 seconds
No
Yes
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