33
®
EXTENDED PREPURGE
With EPD programmers, it may be necessary to extend the pre-purge timing on the Flame Safeguard
Control to greater than 30 seconds. This can be accomplished by adding a time delay relay in the L2/
M and D/8 circuit and wired in the following manner:
The maximum extended purge time will be 10 minutes. The maximum time delay setting should be
9
1
/
2
minutes. If the time delay relay does not close the D-8 circuit within 10 minutes of the start, the
Flame-Monitor control will LOCKOUT and the message will be LOCKOUT D-8 HI PURGE
OPEN.
EP-style programmers provide this feature via dipswitches 3, 4, and 5.
Auxiliary Device in M-D-8 Circuit at Flame Monitor Control
The function of the low fire start and high fire purge interlock circuits internally in a new
Fireye Flame-Monitor unit is accomplished by highly reliable solid state electronic circuitry.
This prohibits the connection of power consuming devices (i.e. lamps, annunciators, relays,
timers, etc.) to the D or 8 terminals.
COMBINATION FUEL BURNERS
Note: An important safety feature of the FLAME-MONITOR system is the ability to monitor the
proper timed operation of critical terminals; fuel valve terminals 5, 6 and 7 for instance. Jumpering
of these terminals could therefore cause the control to sense an unusual condition and LOCKOUT.
When changing fuels on combination fuel burners if DIRECT SPARK IGNITION is used, it is nor-
mal to jumper these terminals. To assure that burner operation is not interrupted in this situation, you
must do one of the following:
1.
Interrupt power to Ll/L2 momentarily when changing fuels, before the initial burner cycle on
the new fuel. Follow the diagram on page 34.
OR
2.
Install a time delay relay contact in the jumper circuit which is timed to close 3 seconds (mini-
mum) after terminal 6 is energized. This method is only acceptable on programmers labeled
“12” or higher (i.e. datecode 8710-12).
H
N
110V
HIGH FIRE
INTERLOCK
N.O. TIME DELAY CONTACT
TIME DELAY RELAY.
ADJUSTABLE TIMING UP
TO 9 1/2 MINUTES
FLAME MONITOR
WIRING BASE
L1
L2
M
8
D
5
6
7
L2
3 SEC. (MINIMUM)
DELAY CLOSED
