RM7895A RELAY MODULE
32-00122-01
16
CHECKOUT
WARNING
Fire or Explosion Hazard.
Can cause serious injury, death or property
damage.
Do not allow fuel to accumulate in the combustion
chamber. If fuel is allowed to enter the combustion
chamber for longer than a few seconds without
igniting, an explosive mixture could result.
It is recommended that you limit the trial for pilot to
ten seconds, and limit the attempt to light the main
burner two seconds from the time the fuel has
reached the burner nozzle. In any case, do not
exceed the nominal lightoff time specified by the
equipment manufacturer. Close the manual fuel
shutoff valves if the flame is not burning at the end
of the specified time.
WARNING
Electrical Shock Hazard.
Can cause serious injury or death.
1. Use extreme care while testing the system. Line
voltage is present on most terminal connections
when power is on.
2. Open the master switch before removing or
installing the RM7895.
3. Make sure all manual fuel shutoff valves are
closed before starting the initial lightoff check
and the Pilot Turndown tests.
4. Do not put system in service until you have
satisfactorily completed all applicable tests in
this section and any others required by the
equipment manufacturer.
CAUTION
Equipment Damage Hazard.
Can damage equipment or cause improper
operation.
If an RM7895 is replaced with a lower or higher
functioning 7800 SERIES Relay Module, the
burner will not sequence unless wiring changes are
made.
IMPORTANT
1. If the system fails to perform properly, refer to
7800 SERIES System Annunciation Diagnostics
and Troubleshooting, form 65-0233.
2. Repeat ALL required Checkout tests after all
adjustments are made. ALL tests must be satisfied
with the flame detector(s) in the FINAL position.
Equipment Recommended
Volt-ohmmeter (1 Mohm/volt minimum sensitivity) with:
• 0-300 Vac capability.
• 0-6000 ohm capability.
• 0-10 Vdc capability.
Checkout Summary
• Preliminary inspection—all installations.
• Flame signal measurement—all installations.
• Initial lightoff check for proved pilot—all installations
using
a pilot.
• Initial lightoff check for direct spark ignition of oil—all
burners using DSI.
• Pilot turndown test—all installations using a pilot.
• Hot refractory hold-in test—all installations.
• Ignition interference test—all installations using
flame rods.
• Ignition spark pickup—all installations using
Ultraviolet
Flame Detectors.
• Response to other ultraviolet sources—all
installations
using Ultraviolet Flame Detectors.
• Flame signal with hot combustion chamber—all
installations.
• Safety shutdown tests—all installations.
See Fig. 1 for location of component parts and see Fig. 5 or
Q7800 Specifications for terminal locations.
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 (are) clean, installed and
positioned properly. Consult the applicable
Instructions.
3.
Correct combination of flame amplifier and flame
detector(s) is used. See Table 2 in the Specifications
section.
4.
Plug-in amplifier and purge card are securely in
place.
5.
Burner is completely installed and ready to fire; con-
sult 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 switch is reset (push in reset push button)
only if the RM7895 is powered, see Fig. 1.
9.
System is in the STANDBY condition. POWER LED is
energized.
10.
All limits and interlocks are reset.
Flame Signal Measurement (Fig. 17 and Table 8).
