INSTALLATION INSTRUCTIONS
RM7800L1087, RM7840G1022, RM7840L1075, EC7840L1014
RM7800L2087, RM7840G2022, RM7840GL2075, EC7840L2014
Relay Modules with Valve Proving
APPLICATION
The Honeywell RM7800L/40G,L and EC7840L Relay
Modules are microprocessor-based integrated burner
controls for automatically fired gas, oil, or combination fuel
single burner applications. The RM7800L/40G,L and
EC7840L Relay Modules are used for UL/CSA Modulating
and FM/IRI Modulating burner applications. The
RM7800L/40G,L, EC7840L
system consists of a Relay
Module. Keyboard Display Modules (standard with
RM7800), Dust Cover (standard with RM7840/EC7840L),
Subbase, Amplifier, and Purge Card. Options include DATA
CONTROLBUS MODULE™, Remote Display Mounting,
First-Out Expanded Annunciator and Modbus™
communications capable.
Functions provided by the RM7800L/40G,L, EC7840L
include automatic burner sequencing, flame supervision,
system status indication, system or self-diagnostics and
troubleshooting.
Using the S7800A2142 Keyboard Display (standard on
RM7800L2087) the following features can be set up:
• Post Purge time—Up to 60 minutes—Device shipped
with 15 seconds Post purge.
• Valve Proving features including:
— VPS test time
— When (Never, Before, After, Split or Both)
• See S7800A1142 Instructions (65-0288), also see
S7800A2142 Instructions. Series 5 can be
programmed for Modbus communication.
At commissioning time, the Valve Proving System may be
scheduled to occur at one of five different times:
• Never—Device default as received—Valve proving
does not occur.
• Before—Valve proving before run concurrent with Pre-
Purge.
• After—Valve proving occurs after the Run state,
before the device goes to Standby (Concurrent with
Post-Purge, if selected.)
• Both—Valve proving occurs at both times Before and
After, noted above.
• Split—The main valve 2 (MV2) (high pressure) seat
test is performed at the Before time and the main
valve 1 (MV1) (low pressure) seat test is performed
during the After time.
The following assumptions apply when using the
RM7840G,L, RM7800L, EC7840L:
Fig. 1. The valve proving system.
MV1—Wired to terminal 9. It is located in the most
upstream position of the main gas valve train.
VPS—Valve Proving Switch: Setpoint at 1/2 of Main Valve
inlet pressure.
MV2—Wired to terminal 21. It is the main valve located
closest to the burner.
The PII—Pre-Ignition Interlock (or Proof of Closure Switch)
for terminal 20 can be installed on MV1, MV2, or as a
series connection through both valves.
Appendix B lists many wiring options for single and dual
fuel along with the Valve Proving options.
MV1
MV2
VP
SW.
M24161A
OUTLET
INLET
1
CAUTION: VALVE ENERGIZING TIMING IS BASED ON HONEYWELL VALVE
OPENING TIMES OF 13 SECONDS MAXIMUM.
− FOR VALVES WITH TIMINGS GREATER THAN 13
SECONDS OR THOSE THAT DO NOT OPEN THE ACTIVE
VALVE WITHIN THE ENERGIZED TIME, A BYPASS SSOV
RATED SOLENOID 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 21 FOR MV2).
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