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RM7890A/B
7800 SERIES Relay Modules
APPLICATION
The Honeywell RM7890A/B Relay Modules are
microprocessor based integrated burner controls for
automatically fired, gas only (if Valve Proving feature is
going to be used), single burner on/off applications. The
RM7890A/B System consists of a relay module, subbase,
and amplifier. Options include keyboard display module
(KDM) and remote display mounting.
Functions the RM7890 provides include automatic on/off
burner sequencing, flame supervision, system status
indication, system or self-diagnostics and
troubleshooting.
This document covers the following 7800 Series Relay
Modules:
RM7890A1056
RM7890B1048
RM7890A2056
RM7890B2048
RM7890A/B Relay Modules offer the following additional
features:
• Preignition Interlock Input
• Selectable Intermittent/Interrupted Pilot Function (full
pilot flame and main flame establishing periods apply if
interrupted pilot feature selected).
• Run/Test Switch for interrupted pilot setup.
• Blinkum fault annunciation on safety shutdown (power
LED blinks a fault code.
• Built-in features set up only using the S7800A1142
display.
• Valve Proving System.
The Valve Proving System feature provides a systematic
way of testing the valve seat integrity to assure the valves
are indeed in the closed state when the system is in
Standby.
Content
APPLICATION ....................................... ......................................... 1
....................................... ......................................... 2
........................................... ......................................... 2
................................... ......................................... 6
V
........................ ......................................... 10
PRINCIPAL TECHNICAL FEATURES ..................................... 14
............................................... ......................................... 14
SETTINGS AND ADJUSTMENTS ... ......................................... 15
At commissioning time, the Valve Proving System may be
scheduled to occur at one of five different times:
1. Never-Device default as received; valve proving
2. Before-Valve proving after standby and safe start
3. After-Valve proving occurs after the Run state
4. Both-Valve proving occurs at both times Before and
5. Split-The downstream (high pressure) seat test is
The following assumptions apply when using the
RM7890A/B Valve Proving testing:
INLET
1 CAUTION: VALVE ENERGIZING TIMING IS BASED ON VALVE OPENING
Fig. 1. Valve Proving System-simplified diagram.
S
I
NITIAL
P
ILOT
I
H
OT
I
GNITION
19
S
AFETY
T
SAFETY AND SECURITY.................... ......................................... 27
SIL
3
Capable
INSTALLATION INSTRUCTIONS
does not occur.
check, prior to ignition trials.
before the device goes to Standby.
After noted above.
performed at the Before time and the upstream (low
pressure) seat test is performed during the After
time.
MV1
VP
SW.
1
TIMES OF 13 SECONDS MAXIMUM.
− FOR VALVES WITH TIMINGS GREATER THAN 13
SECONDS - A BYPASS SOLENOID (RATED AS A SAFETY
SHUTOFF VALVE) VALVE (1/4", 120 VAC) IS REQUIRED TO
OBTAIN THE PROPER TEST PRESSURES.
− THE BYPASS VALVE WILL BE WIRED IN PARALLEL TO THE
VALVE IT IS BYPASSING (TERMINAL 9 FOR MV1 OR
TERMINAL 17 FOR MV2).
C
................................. ......................................... 16
..................... ......................................... 17
........................ ......................................... 19
S
R
T
(A
PARK
ESPONSE
EST
................................. ......................................... 21
MV2
OUTLET
M22660B
U
P
)18
SING A
ILOT
R
).................... 19
ODS
U
D
LL
LTRAVIOLET
ETECTORS
)....................... 20
32-00205-01
)
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