Honeywell 7800 Series Installation Instruction page 12

RM7800E,G,L,M; RM7840E,G,L,M 7800 SERIES RELAY MODULES
Ignition Trials
1. Pilot Flame Establishing Period (PFEP):
a. With the firing rate motor at the low fire position:
(1) The pilot valve and ignition transformer,
terminals 8, 10 and 21, are energized. The
RM7800M has an intermittent pilot valve,
terminal 21. The RM7800/RM7840G has an
interrupted or intermittent pilot valve, terminal
21, depending on the selection of configuration
jumper 2. The RM7800/RM7840E,L has a
fifteen-second interrupted pilot valve, terminal
21. All of the RM7800/RM7840s have a
ten-second interrupted pilot valve/ignition,
terminal 8.
(2) During PFEP, the Low Fire Switch must remain
closed. If it opens, a safety shutdown occurs.
(3) The Preignition Interlock input is ignored
throughout the Ignition Trial state.
b. Flame must be proven by the end of the ten-second
PFEP (four if JR1 is clipped) to allow the sequence
to continue. If flame is not proven by the end of
PFEP, a safety shutdown occurs.
c. After five seconds, the ignition, terminal 10, is
de-energized for early spark termination.
2. Main Flame Establishing Period (MFEP):
a. Terminal 9 is energized when the presence of flame
is verified at the end of a 10-second Pilot Flame
Establishing Period (PFEP) (four seconds if JR1 is
clipped).
b. Terminal 8 is turned off 10 seconds after Terminal 9
is energized.
c. Terminal 21 action:
(1) RM7800E,L/RM7840E,L: De-energized
15 seconds after Terminal 9 is energized.
(2) RM7840G:
Device Initiate Standby Purge
RM7800E/ 10 sec.. *
RM7840E
RM7800G/
RM7840G
RM7800L/
RM7840L
RM7800M/
RM7840M
* STANDBY and RUN can be an infinite time period.
**PURGE determined by which ST7800A purge card is selected.
a
The MFEP is determined by which terminal is used, configuration jumper selected or jumper wire added.
See Fig. 2, 3, 4, 5 and 6.
b
RM7800L1053, RM7840L1026: 10 second or intermittent.
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Table 6. Sequence Timing for Normal Operation.
Flame Establishing
Period
a
Pilot Main
** 4 or 10 10 or 15
sec. sec.
10, 15 sec.
or
intermittent
10 or 15
b
sec.
10 sec. or
intermittent
12
(a) Not turned off, or
(b)15 seconds after Terminal 9 is energized and
JR2 is clipped, or
(c)30 seconds after Terminal 9 is energized and
Terminals 5 and 19 are jumpered and jumper
JR2 is clipped.
(3) RM7800L1053, RM7840L1026,
RM7800M/RM7840M: Remain energized as
long as call for heat is present.
Run
1. A ten-second stabilization period occurs at the
beginning of the RUN period.
2. The firing rate motor releases to modulation
(RM7800/RM7840E,G,L). Damper motor is energized
(RM7800/RM7840M).
3. The RM7800/RM7840 is now in RUN and remains in
RUN until the controller input, terminal 6, opens,
indicating that the demand is satisfied or a limit opened.
Postpurge
The RM7800/RM7840 provides a fifteen-second
POSTPURGE following the completion of the RUN period.
The blower motor output is powered to drive all products of
combustion and any unburned fuel from the combustion
chamber. It also supplies combustion air to burn fuel being
purged from the fuel line downstream of the fuel shutoff valve.
1. The main fuel valve and intermittent pilot valve,
Terminals 9 and 21, are de-energized and the firing rate
motor is commanded to the low fire position to begin the
POSTPURGE period.
2. The Preignition Interlock closes within the first five
seconds of POSTPURGE.
Post-
Purge Interlock
Run Timing Circuits
* 15 sec. Preignition, 4-wire
Lockout, modulating
High and
Low Fire
Preignition,
Running,
Low Fire
Preignition,
Lockout,
High and
Low Fire
Preignition, 2-wire
Running, isolated
Low Fire On-Off-On
contacts
Firing Energy Approval
Rate Saving Code
Circuit Prepurge Bodies
Yes FM/IRI
Modulating
UL/CSA
No
Modulating
FM/IRI
Modulating
UL/CSA
On-Off