Rapid Engineering 2000 Series, Installation, Operation & Service Manual

Page: 63 / 101

SECTION 17: S
EQUENCE OF
O
PERATION
57
Pilot Trial for I g nition
• J u mpers JP6 and JP7 are u sed by the factory
only to select the PTFI for the M4RT1. The factory
set, defa
u lt PTFI time is 10 seconds (JP6
installed, JP7 not installed). The PTFI time may
only be set by the factory.
Recycle/Non-recycle Operation
• J u mper JP8 is u sed to select either Recycle or
Non-Recycle operation of the M4RT1. The factory
set, defa
u lt is Recycle operation (JP8 installed).
To select Non-Recycle operation, c u t j u mper JP8.
17.4.2.3 Fireye® M4RT1 Flame Safe g uard Opera-
tion (FM ≥ 2.5MBH and XL ≥ 1MBH)
The follo w ing w ill describe the internal operation of a
flame safeg u ard control (that has had its j u mpers
changed to comply w ith the agency req u irements)
and the external f u nctions that w ill take place. Refer
to the dra w ing belo w to follo w the steps. We w ill j u st
trace the electromechanical steps and not the
electronic net
w ork.
• All interlocks, control relays and safety limits are
closed. Po w er is s u pplied to terminal #7 of the
flame safeg u ard.
• The Operating Control LED ill u minates.
• The electronic net w ork is no w po w ered u p w hich
ill u minates the Air Flo w LED.
• Follo w ing a time delay period (p u rge cycle) 7
seconds. The electronic net w ork closes a contact
that po w ers u p terminal #3 and terminal #4 in the
safeg u ard control.
• Terminal #3 po w ers u p the eq u ipment's pilot gas
solenoid v al v e w hich opens allo w ing gas to flo w .
• Terminal #4 po w ers u p the ignition mod u le
creating the spark at the b u rner.
• This lasts for 10 seconds. This cycle is called trial
for ignition. D u ring this time period, the PTFI LED
is ill u minated.
• When the flame sensor detects a pilot flame, the
signal is sent back to the safeg u ard control. The
electronic net w ork ill u minates the FLAME LED.
• It closes an internal contact, w hich po w ers u p
terminal #5 in the control. This terminal po w ers u p
the main gas v al v es allo w ing the main b u rner to
come on.
• At the same time that the contact in step b closes,
the electronic net w ork opens a contact, w hich
po w ers terminal #4. This sh u ts off the po w er to
the ignition mod u le, w hich stops the spark at the
b u rner. The safeg u ard control at this point
monitors the flame.
NOTE: If a pilot flame is not detected d u ring the 10
second trial for ignition, the pilot gas solenoid v al v e
and the ignition mod u le are t u rned off. A safety
locko u t occ u rs w hich sh u ts do w n the electronic
net w ork. The only LED that w ill be ill u minated at this
time w ill be the OPERATING CONTROL. 30 seconds
after the locko u t has acti v ated, the alarm circ u it is
po w ered u p, ill u minating the ALARM LED. Man u al
reset is no w req u ired. Wait 10 seconds before
resetting the control to allo w the locko u t s w itch to
cool do w n.