2nd Ave. Honeywell Relay Modules 7800 Series - Manual (Page 2)

2
7800 SERIES RELAY MODULES
65-0229—1
Table 1. Checkout Steps and Applicable 7800 Series Systems.
Checkout Step
Piloted
Systems DSI Systems
Infrared Flame
Detectors
Flame Rod
Systems
Ultraviolet Flame
Detectors
Preliminary Inspection X X X X X
Flame Signal Measurement X X X X X
Initial Lightoff Check for
Proved Pilot
X
Initial Lightoff Check for
Direct Spark Ignition
X
Pilot Turndown Test X
Ignition Interference Test X
Hot Refractory Saturation
Test
X
Hot Refractory Hold-in
Test
X X X X X
Ignition Spark Pickup X
Response to Other
Ultraviolet Sources X
Flame Signal with Hot
Combustion Chamber X X X X X
Safety Shutdown Tests X X X X X
Preliminary Inspection
Perform the following inspections to avoid common problems.
Make certain that:
1. Wiring connections are correct and all terminal screws
are tight.
2. Flame detector(s) is clean, installed and positioned
properly. Consult the applicable Instructions.
3. Combination of amplifier and flame detector(s) is
correctly used. See the amplifier specifications.
4. Plug-in amplifier and purge card (if required) are
securely in place.
5. Burner is completely installed and ready to fire; consult
equipment manufacturer instructions. Fuel lines are
purged of air.
6. Combustion chamber and flues are clear of fuel and
fuel vapor.
7. Power is connected to the system disconnect switch
(master switch).
8. Lockout is reset (reset button) only if the Relay Module
is powered.
9. Run/Test Switch (if present) is in RUN position.
10. System is in STANDBY condition. STANDBY message
is displayed in the S7800 Keyboard Display Module.
11. All limits and interlocks are reset.
Flame Signal Measurement
See instructions provided with the amplifer.
INITIAL LIGHTOFF CHECKS
Proved Pilot Systems
Perform this check on all installations that use a pilot. It
should immediately follow the preliminary inspection.
NOTE: Low fuel pressure limits, if used, could be open. If so,
bypass them with jumpers during this check.
1. Open the master switch.
2. Make sure that the manual main fuel shutoff valve(s) is
closed. Open the manual pilot shutoff valve. If the pilot
takeoff is downstream from the manual main fuel
shutoff valve(s), slightly open the manual main valve to
supply pilot gas flow. Make sure the main fuel is shut off
just upstream from the burner inlet, or disconnect power
from the automatic main fuel valve(s).
3. Close the master switch and start the system with a call
for heat by raising the setpoint of the operating
controller, see the relay module sequence. The 7800
Series Relay Module should start the INITIATE
sequence.
4. Let the sequence advance to PILOT IGN (status is
displayed on the Keyboard Display Module, if used),
PILOT LED turns on, ignition spark should occur and
the pilot should light. If the pilot ignites, the FLAME LED
is energized. Go to step 7.
5. If the pilot flame is not established in ten seconds (four
seconds if configuration jumper JR1 is clipped), safety
shutdown occurs. Let the sequence complete its cycle.
6. Push the reset pushbutton, and let the system recycle
once. If the pilot still does not ignite, make the following
ignition/pilot adjustments:
a. Open the master switch and remove the 7800
Series Relay Module from the subbase.