RM7895A RELAY MODULE
5
32-00122-01
Fig. 3. Ultraviolet detectors.
PRINCIPAL TECHNICAL
FEATURES
The RM7895 provides all customary flame safeguard
functions while providing significant advancements in the
areas of safety, annunciation and system diagnostics.
Safety Shutdown (Lockout) Occurs
If:
1.
INITIATE PERIOD
a. Purge card is not installed or is removed.
b. Purge card is bad.
c. Configuration jumpers have been changed after
200 hours of operation.
d. Ac line power errors occurred, see Operation.
e. Four minute INITIATE period has been exceeded.
2.
STANDBY PERIOD
a. Flame signal is present after 40 seconds.
b. Ignition/pilot valve/intermittent pilot valve ter-
minal is energized.
c. Main valve terminal is energized.
d. Internal system fault occurred.
e. Purge card is not installed or is removed.
f.
Purge card is bad.
3.
PREPURGE PERIOD
a. Airflow lockout feature is enabled and the airflow
switch does not close after ten seconds or within
the specified purge card timing.
b. Flame signal is detected after 30 seconds.
c. Ignition/pilot valve/intermittent pilot valve ter-
minal is energized.
d. Main valve terminal is energized.
e. Internal system fault occurred.
f.
Purge card is removed.\
g. Purge card is bad.
4.
PILOT FLAME ESTABLISHING PERIOD (PFEP)
a. Airflow lockout feature is enabled and the airflow
switch opens.
b. Ignition/pilot valve terminal is not energized.
c. No flame present at end of PFEP.
d. Main valve terminal is energized.
e. Internal system fault occurred.
f.
Purge card is removed.
g. Purge card is bad.
5.
RUN PERIOD
a. No flame present.
b. Airflow lockout feature is enabled and the airflow
switch opens.
c. Main valve terminal is not energized.
d. Internal system fault occurred.
e. Purge card is remove.
f.
Purge card is bad.
SAFETY PROVISIONS
Internal Hardware Status
Monitoring
The RM7895 checks the purge card for correct parity to
prevent purge timing shifts and circuitry failures. It also
analyzes the integrity of the configuration jumpers and
internal hardware. The POWER LED will blink every four
seconds, signifying an internal hardware check.
COLLAR WITH 1/2-14 NPSM
INTERNAL THREADS
4 (102)
8 FOOT (2.44 METER)
LEADWIRES (2)
M1943F
C7027A1064 HAS 24 FOOT (7.32 METER) LEADWIRES.
C7027A1114 HAS 44 IN. (1.118 M) LEADWIRES WITH
22 IN. (558 MM) FLEXIBLE CONDUIT.
1
2
2
3-1/2 (89)
1-1/16
(27)
1
MODELS AVAILABLE WITH SPUD CONNECTOR (1/2-14 NPSM INTERNAL
THREADS) INSTEAD OF CLAMP TYPE CONNECTOR.
1/2-14 NPSM
INTERNAL THREADS
2
2 (51)
COLLAR WITH
1 - 1-1/2 NPSM
INTERNAL
THREADS
1
1
DIN APPROVED C7035A1064 HAS 1-11 BSP.P1 INTERNAL MOUNTING THREADS.
DIN APPROVED C7035A1064 HAS 1/2-14 BSP-F INTERNAL MOUNTING THREADS.
C7035A1056 HAS 12 FOOT (3.66 METER) LEADWIRES.
2
3
INSERTION DEPTH
6 FOOT
[1.83 METER]
LEADWIRES (2)
3
M1945D
2-5/8 (67)
1-1/2
(38)
31/32
(25)
4-1/8 (105)
1-3/16
(30)
6 FOOT [1.83 METER]
LEADWIRES (2)
MOUNTING BRACKET
3-5/8 (92)
1/2
(13)
1-27/64
(36)
3/8
(10)
7/8
(22)
9/16
(14)
M1944B
