Table of Contents
Advertisement
S
XT I
, O
ERIES
NSTALLATION
PERATION AND
2. Air Flow - This indicator comes on at the same
time as the one above. This is because the
actual circuit is not used and is jumped out. It
can be used as a troubleshooting guide, that
power is present to terminals #6 and #8 in the
flame safeguard.
3. PTFI - This acronym stands for Pilot Trial For
Ignition. This indicator is on only during the trial
for ignition period. It indicates that terminal #3
(pilot valve) and terminal #4 (ignition module),
in the flame safeguard, have been turned on.
4. Flame On - This indicator comes on after the
flame safeguard has proven out the flame sig-
nal. It also shows that the main valves have
been activated in the equipment. On the safe-
guard control, terminal #5 is powered up.
5. Alarm - This indicates that a safety lockout has
occurred, whether by loss of flame signal or
failure to ignite.
17.3.2.1 Fireye
®
M4RT1 Flame Safeguard Opera-
tion (ANSI, FM < 2.5MBH and XL < 1MBH)
The following will describe the internal operation of a
flame safeguard and the external functions that will
take place. We will just trace the electromechanical
steps and not the electronic network.
• All interlocks, control relays and safety limits are
closed. Power is supplied to terminal #7 of the
flame safeguard.
• The Operating Control LED illuminates.
• The electronic network is now powered up which
illuminates the Air Flow LED.
NOTE: The airflow circuit of the safeguard control is
not used and is jumped. This is why the Air Flow LED
illuminates with the Operating Control LED.
• Following a short time delay period (purge cycle)
determined by the jumpers, See Page 53, Figure
28 and Page 53, Table 13. The electronic network
closes a contact that powers up terminal #3 and
terminal #4 in the safeguard control.
• Terminal #3 powers up the equipment's pilot gas
solenoid valve which opens allowing gas to flow.
• Terminal #4 powers up the ignition module
creating the spark at the burner.
• This lasts for 10 seconds. This cycle is called trial
for ignition. During this time period, the PTFI LED
is illuminated.
52
S
M
ERVICE
ANUAL
• When the flame sensor detects a pilot flame, the
signal is sent back to the safeguard control. The
electronic network illuminates the FLAME LED.
• It closes a contact, which powers up terminal #5
in the control. This terminal powers up the main
gas valves allowing the main burner to come on.
• At the same time the electronic network opens a
contact which removes power from terminal #4.
This shuts off the power to the ignition module,
which stops the spark at the burner. The
safeguard control at this point monitors the flame.
NOTE: If a pilot flame is not detected during the 10
second trial for ignition, the pilot gas solenoid valve
and the ignition module are turned off. A safety
lockout occurs which shuts down the electronic
network. The only LED that will be illuminated at this
time will be the OPERATING CONTROL. 30 seconds
after the lockout occurs, the alarm circuit is powered
up, illuminating the ALARM LED. Manual reset is
now required. Wait 10 seconds before resetting the
control to allow the lockout switch to cool down.
NOTE: If the flame signal is lost while the burner is
on, the ignition module will be turned back on. A 10-
second re-light trial for ignition is started. The PTFI
LED will illuminate during this time.If a flame signal is
detected, the main gas valves will turn back on and
the ignition module will turn off. If a flame is not
detected during this re-light trial, the pilot gas
solenoid valve and ignition module will shut off. A
safety lockout occurs which shuts down the
electronic network. The only LED that will be
illuminated at this time will be the OPERATING
CONTROL. Thirty seconds after the alarm lockout
happens the alarm circuit is powered up, illuminating
the ALARM LED. Manual reset is now required. Wait
10 seconds before resetting the control to allow the
lockout switch to cool down.
17.3.2.2 Fireye® M4RT1 Flame Safeguard (FM ≥
2.5MBH and XL ≥ 1MBH)
If the equipment is ordered with a FM compliant
Manifold equal or over 2.5M BTU or XL compliant
equal to or over 1M BTU, certain sequences must be
provided in the flame safeguard control. There is a
specified time for pre-purge, trial for ignition, and non
recycle.
1.
Timed pre-purge
This must be a separate purge from the rest of
Advertisement
Table of Contents
