RM7895A RELAY MODULE
32-00122-01
12
Fig. 8. Dust Cover mounting.
Fig. 9. Flame Signal amplifier mounting.
Fig. 10. Flame detector wiring.
OPERATION
Sequence of Operation
The RM7895 has the following operating sequences, see
Fig. 11. Sequence status LEDs are shown in Fig. 12.
INITIATE
The RM7895 enters the INITIATE sequence when the
Relay Module is powered. The RM7895 can also enter the
INITIATE sequence if the Relay Module verifies voltage
fluctuations of +10/-15% or frequency fluctuations of
±10% during any part of the operating sequence. The
INITIATE sequence lasts for ten seconds unless the
voltage or frequency tolerances are not met. When the
tolerances are not met, a hold condition will be initiated
and will be displayed on the optional KDM for at least five
seconds. When the tolerances are met, the INITIATE
sequence will restart. If the condition is not corrected and
the hold condition exists for four minutes, the RM7895
will lockout. Causes for hold conditions in the INITIATE
sequence are:
• AC line dropout is detected.
• AC line frequency error caused by using a 60 Hz
device
on a 50 Hz line, or vice versa (devices with a date code
prior to 9804).
• AC line noise that can prevent a sufficient reading of
the
line voltage inputs.
• Brownouts caused by a low line voltage.
The INITIATE sequence also delays the burner motor
starter from being energized and de-energized from an
intermittent AC line input or control input.
M3514B
BLUE
WHITE
F
G
ULTRAVIOLET (C7027/C7035/C7044)
BLUE
YELLOW
BLACK
BLACK
F
G
L1
L2
SOLID STATE ULTRAVIOLET
(C7012A,C)
1
2
G
F
X
X
FLAME ROD
1 FLAME DETECTOR LEADS ARE COLOR CODED. THE BLUE LEAD MUST BE CONNECTED TO THE F TERMINAL
AND THE WHITE MUST BE CONNECTED TO THE G TERMINAL. THE UV SENSING TUBE IS POLARITY SENSITIVE.
REVERSING THE LEADS EVEN MOMENTARILY CAN DAMAGE OR DESTROY THE UV TUBE.
FLAME DETECTOR LEADS ARE COLOR CODED. THE BLUE LEAD MUST BE CONNECTED TO THE F TERMINAL
AND THE YELLOW MUST BE CONNECTED TO THE G TERMINAL. THE UV SENSING TUBE IS POLARITY SENSITIVE.
REVERSING THE LEADS EVEN MOMENTARILY CAN DAMAGE OR DESTROY THE UV TUBE.
2
