Honeywell 7800 Series Manual page 37

CAUTION
If an RM7888A is replaced with a lower function-
ing 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 the
Troubleshooting section and 7800 SERIES System
Annunciation and Troubleshooting, form 65-0118.
2. Repeat ALL required Checkout tests after all adjust-
ments are made. ALL tests must be satisfied with the
flame detector(s) in its FINAL position.
EQUIPMENT RECOMMENDED
Volt-ohmmeter (20 kohm/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 saturation test—all installations using
Infrared (lead sulfide) Flame Detectors.
• Hot refractory hold-in test—all installations.
• Ignition interference test—all installations using flame
rods.
• Ignition spark pickup—all installations using Ultra-
violet Flame Detectors.
• Response to other ultraviolet sources—all installa-
tions using Ultraviolet Flame Detectors.
• Flame signal with hot combustion chamber—all
installations.
• Safety shutdown tests—all installations.
See Fig. 24 for location of component parts and see Figs. 7,
8, 9, and 10 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 clean, installed and positioned
properly. Consult the applicable Instructions.
3. Correct combination of amplifier and flame detector(s)
is used. See Table 2 in the Specifications section.
4. Plug-in amplifier is 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 (push in reset button), only if the
RM7888A is powered, see Fig. 24.
9. System is in the Standby condition. POWER LED is
energized.
10. All limits and interlocks are reset.
FLAME SIGNAL MEASUREMENT (TABLE 11
AND FIG. 29)
Fig. 29—Flame signal measurement.
NEGATIVE (-)
METER LEAD
37
RM7888A
CHECKOUT
POSITIVE (+)
METER LEAD
ONE
MEGOHM/VOLT
METER
M7382
65-0175