Checkout - Honeywell RM7824A Product Data

7800 SERIES RM7824A RELAY MODULE
RM7824A
Test No. Models
4 All
5 All
6 All
Final All

CHECKOUT

WARNING
Explosion or Fire Hazard.
Can cause severe injury, death or property
damage.
Do not allow fuel to accumulate in the combustion
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
shutoff valve(s) if the flame is not burning at the end of
the specified time.
WARNING
Electrical Shock Hazard, Fire or Explosion Hazard.
Can cause severe injury, death or property
damage.
1. Use extreme care while testing the system. Voltage
is present on most terminal connections when
power is on.
2. Open the master switch before removing or
installing the RM7824A.
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.
65-0155—2
Test
Jumpers Voltmeter
3-8 —
NOTE: Refer to wiring diagram
3-9 — Automatic fuel vaive(s) open(s).
If using direct spark ignition,
check the first stage fuel valve(s)
instead of the pilot valve.
3-4 — Alarm (if used) turns on.
CAUTION
Equipment Damage Hazard.
Failure to remove jumpers can damage equipment.
After completing these tests, open the master switch and remove all test jumpers from the
subbase terminals. Also remove bypass jumpers from the low fuel pressure limits (if used).
Normal Operation
1. Ignition spark (if ignition
transformer relay is con-
nected to terminal 8.
2. Automatic pilot valve opens
(if connected to terminal 8).
of system being tested.
CAUTION
Equipment Damage Hazard.
Improper replacement of relay module will cause
equipment failure.
If an RM7824A 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 65-0118.
2. Repeat ALL required Checkout tests after all
adjustments are made. ALL tests must be satisfied
with the flame detector(s) in FINAL position.
Equipment Required
Volt-ohmmeter (1M ohm/volt minimum sensitivity):
• 0-6000 ohm capability.
• 0-30 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 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.
14
If Operation is Abnormal, Check the
Item Listed Below
1. Watch for spark or listen for buzz.
a. Ignition electrodes are clean.
b. Ignition transformer is okay.
2. Listen for click or feel head of valve
for activation.
a. Actuator if used.
b. Pilot valve.
Same as test no. 4. If using direct spark
ignition, check the first stage fuel
valve(s) instead of the pilot valve.
1. Alarm.