Honeywell 7800 Series Product Data page 19

POST PURGE
After demand is satisfied or a limit opens, de-energizing
terminal 6, the Ignition/Pilot valve, main valve and delayed
main valve, terminals 8, 9, and 21 are de-energized. The
blower motor, terminal 4, remains powered for 15 seconds.
See Table 6 for further details of Hold conditions.
Run/Test Switch Functions
The Run/Test Switch is located on the top side of the
RM7896C,D, see Fig. 17. The Run/Test Switch allows the
burner sequence to be altered as follows:
1. In the measured PREPURGE sequence, the Run/Test
Switch, when placed in the TEST position, causes the
PREPURGE timing to stop.
2. In the Pilot Flame Establishing Period, the Run/Test
Switch, when placed in the TEST position, stops the
timer during the first eight seconds of a ten second PFEP
selection or during the first three seconds of a four sec-
ond PFEP selection. It also allows for pilot turn-down test
and other burner adjustments. This activates a fifteen
second flameout timer that permits pilot flame adjust-
ment without nuisance safety shutdowns. The Run/Test
Switch is ignored during PFEP for RM7896C,D if termi-
nals 8 and 9 or 9 and 21 are jumpered.
NOTE When the RM7896C,D is switched to the Test mode,
it stops and holds at the next Run/Test Switch point
in the operating sequence. Make sure that the Run/
Test Switch is in the Run position before leaving the
installation.
WARNING
Do not use the Run/Test Switch during Pilot Flame
Establishing Period for the RM7896C,D when using
direct spark ignition.
Selectable site-configurable jumpers
The RM7896 has three site-configurable jumper options, see
Fig. 19 and Table 3. The site-configurable jumpers should be
clipped with side cutters and the resistors removed from the
Relay Module.
SELECTABLE CONFIGURATION JUMPERS
RUN/TEST SWITCH
(RM7896C,D)
Fig. 19. Selectable site-configurable jumpers.
7800 SERIES RM7896A,B,C,D RELAY MODULE
SERVICE
NOTE: Clipping and removing a site-configurable jumper
enhances the level of safety.
Static Checkout
CAUTION
1. Use extreme care while testing the system. Line
2. Open the master switch before installing or
3. Before continuing to the next test, be sure to
4. Replace all limits and interlocks not operating
5. Close all manual fuel shutoff valve(s) before
After checking all wiring, perform this checkout before
installing the RM7896 on the subbase. These tests verify the
Q7800 Wiring Subbase is wired correctly, and that the
external controllers, limits, interlocks, actuators, valves,
transformers, motors and other devices are operating
properly.
NOTE: Do not perform a dielectric test with the RM7896
installed. Internal surge protectors will break down
and conduct a current. This could cause the
RM7896 to fail the dielectric test or possibly destroy
the internal lightning and high current transient
protection components.
Equipment Recommended
1. Voltmeter (20K ohm/volt minimum sensitivity) set on the
0-300 Vac scale.
2. Two jumper wires; no. 14 wire, insulated, 12 inches
(304.8 mm) long, with insulated alligator clips at both
ends.
Table 3. Site configurable jumper options.
Jumper
Number Description
JR1
JR2
JR3
General Instructions
1. Perform all applicable tests listed in Static Checkout,
Table 4, in the order listed.
2. Make sure that all manual fuel shutoff valves are
closed.
3. Perform only those tests designated for the specific
M7553
RM7896 model being tested.
19
voltage is present on most terminal connections
when power is on.
removing a jumper on the subbase.
remove test jumper(s) used in the previous tests.
properly. Do not bypass limits and interlocks.
starting these tests.
Intact
Pilot Flame 10 seconds 4 seconds
Establishing
Period
Flame Failure Recycle
Action
Airflow Switch Recycle
(ILK) Failure
RM7896
Clipped Type
(All)
Lockout (All)
Lockout (All)
65-0193