RM7838B,C 7800 SERIES RELAY MODULE
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Table 8. Site Configurable Jumper Options.
a
Unclipped: RM7838B,C waits indefinitely for a 120V
Manual Open Valve input. When input is received, 10
second MFEP begins. The RM7838B,C also turns on ter-
minal 9.
b
Clipped: After the required PFEP, the RM7838B,C
immediately goes to MFEP by outputting 120 Vac to the
Main Valve terminal 9. At the end of the 10 second MFEP,
if there is not an input on the Manual Open Valve
terminal 17, the RM7838B,C goes to safety shutdown. If
automatic main valves are used, a jumper is required
between terminals 4 and 17.
c
RM7838C1020/RM7838C2020 does not have JR3.
NOTE: SERVICE NOTE: Clipping and removing a
site-configurable jumper enhances the level of
safety.
IMPORTANT
Clipping and removing a site-configurable jumper
after 200 hours of operation results in a
nonresettable Fault 110 and a lockout.
SAFETY AND SECURITY
Physical device protection
Device shall be accessible to authorized personnel only –
Installation on publicly accessible places is not
recommended as this could lead to unwanted and
potentially unsafe changes to device (wiring,
configuration, etc).
It is recommended to lock the device in an enclosed
cabinet with access allowed only to approved and trained
personnel. Also, it is strongly advised to keep all the wiring
of device physically secure.
Physical protection of the device is applied via Run/Test
switch label/seal. It is intended to prevent and detect
unauthorized access.
Modbus & DDL Interface security
Any conducts critical to device functionality (DDL,
Modbus lines etc.) shall be physically protected (installed
outside public access) since they could be damaged or
tampered-with by unauthorized people, either
accidentally or for purpose.
Modbus RS-485 & DDL protocols do not support security
features. For DDL interface - only DDL devices shall be
connected to the Burner Controller DDL line.
License agreement
Copying and reverse engineering is prohibited by the law.
Jumper
Number Description Intact Clipped
JR1 Pilot Flame
Establishing Period
(PFEP)
10 seconds 4 seconds
JR2 Pilot Valve Intermitten
t
Interrupte
d
JR3
a,b,c
Deferred or
immediate Main
Flame
Deferred Immediate
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