Honeywell RM7800L1087 Installation Instructions Manual page 19

c. If Before, Split or Both Valve Proving tests are
selected (and demand input T17 is used), the
RM7800L/40G,L, EC7840L will sequence the
main valves to conduct the VP tests concurrently
with Pre-Purge (beginning at 10 seconds into the
purge time).
d. The Pre-Ignition Interlock input must remain
closed throughout PREPURGE (except during VP
testing); otherwise, control returns to the
STANDBY state and holds (30 seconds) for the
RM7840G or safety shutdown occurs for the
RM7800L/40L, EC7840L.
e. The Lockout Interlock or Running Interlock
inputs (interlock circuit including Airflow Switch)
must close by ten seconds after demand;
otherwise, a recycle to the beginning of
PREPURGE for the RM7840G will happen or a
safety shutdown for the RM7800L/40L,
EC7840L occurs.
f. When PREPURGE timing is complete, the firing
rate motor drives to the low fire position,
RM7800L/40G,L, EC7840L.
g. When the firing rate motor reaches low fire posi-
tion, the Low Fire Switch, terminal 18, input must
be energized before entering the Ignition Trial
state.
Ignition Trials—Pilot Lighted System (Non
VP Operation System) (demand into
terminal 6)
1. Pilot Flame Establishing Period (PFEP):
a. With the firing rate motor at the low fire position
(Low Fire Start Switch-terminal 18 enabled):
b. Terminals 8, 10 and 21, are energized.
NOTE: Low Fire Start Switch-terminal 18 enabled
must remain closed until the
RM7800L/40G,L, EC7840L releases to
modulation - or a safety shutdown will
occur.
The Pre-Ignition Interlock input is ignored
throughout the Ignition Trial state.
c. After five seconds, the ignition, terminal 10, is
de-energized for early spark termination.
d. Flame must be proven by the end of the ten-sec-
ond PFEP (four-seconds if JR1 is clipped). If
flame is not proven by the end of the PFEP, a
safety shutdown occurs.
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).
b. Terminal 8 is turned off 10 seconds after Termi-
nal 9 is energized.
RELAY MODULES WITH VALVE PROVING
c. Terminal 21 action:
(1) RM7800/40L, EC7840L - turned off15-sec-
onds after Terminal 9 is energized.
(2) The RM7840G:
(a) Not turned off, (intermittent pilot).
(b)Turns off 15-seconds after Terminal 9 is
energized (if configuration jumper 2
removed).
(c)Turns off 30-seconds after Terminal 9 is
energized (if configuration jumper 2
removed and terminal 5 is jumpered to ter-
minal 19).
d. The RM78XX releases to modulation (RUN) 15-
seconds (30 seconds for RM7840G with terminal
5 to 19 jumpered) after terminal 9 is energized if
flame is present.
Valve Proving Ignition Trials (demand on
terminal 17) -Pilot Lighted System (Not
VP DSI). (Configuration jumper 2 on
RM7800L/40L, EC7840L or Jumper 3 on
RM7840G MUST be removed).
1. Pilot Flame Establishing Period (PFEP):
a. With the firing rate motor at the low fire position
(Low Fire Start Switch-terminal 18 enabled):
b. Terminals 8, 10, are energized.
NOTE: Low Fire Start Switch-terminal 18 enabled
must remain closed until the
RM7800L/40G, L, EC7840L releases to
modulation - or a safety shutdown will
occur.
The Pre-Ignition Interlock input is ignored
throughout the Ignition Trial state.
c. After five seconds, the ignition, terminal 10, is
de-energized for early spark termination.
d. Flame must be proven by the end of the ten-sec-
ond PFEP (four-seconds if JR1 is clipped). If
flame is not proven by the end of the PFEP, a
safety shutdown occurs.
2. Main Flame Establishing Period (MFEP):
a. Terminal 9 and 21 are energized when the pres-
ence of flame is verified at the end of a 10- sec-
ond Pilot Flame Establishing Period (PFEP) (four
seconds if JR1 is clipped).
b. Terminal 8 is turned off 10 seconds after Termi-
nal 9 and 21 are energized.
c. The RM7800L/40G, L, EC7840L releases to
modulation (RUN) 15-seconds terminal 9 and 21
are energized if flame is present.
19 32-00142—01