Checkout - Honeywell 7800 Series Manual

!
WARNING
Do not allow fuel to accumulate in the combus-
tion chamber. If fuel is allowed to enter the
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 to 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 valve(s) if the flame is not burning at the
end of the specified time.
!
CAUTION
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 RM7800 or Keyboard Display
Module connector.
3. Make sure all manual fuel shutoff valve(s) are
closed before starting the initial lightoff check
and the Pilot Turndown tests.
4. Do not put the system in service until you have
satisfactorily completed all applicable tests in
this section and any others required by the
equipment manufacturer.
!
CAUTION
If an RM7800 is replaced with a lower functioning
7800 SERIES Relay Module, the burner will not
sequence unless wiring changes are made.
IMPORTANT:
1. If the system fails to perform properly, note the fault
code, fault message, equipment status, and sequence
time on the display. Refer to the Troubleshooting
section and 7800 SERIES System Annunciation Diag-
nostics 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 Figs. 1 and 2 for location of component parts and
Figs. 8, 9, 10 and 11 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, and 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.
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 is reset, (push in reset button) only if the
Relay Module is powered, see Figs. 1 and 2.
9. Run/Test Switch is in RUN position.
10. System is in the STANDBY condition. STANDBY
message is viewable in the VFD.
11. All limits and interlocks are reset.
FLAME SIGNAL MEASUREMENT
(Table 8 and Fig. 33)
Measure the flame signal at the appropriate times as
defined in the following Checkout tests. Read the flame
signal in volts dc at the flame amplifier test jacks + and
(Com) or at the Keyboard Display Module.
1. Use 20 kohm/volt meter with a 0 to 10 Vdc capability.
2. Set the 20 kohm/volt meter to the 0 to 10 Vdc range.
35
RM7800E,G,L,M

CHECKOUT

Checkout
65-0117—2