Installation - Honeywell RM7824A Product Data

7800 SERIES RM7824A RELAY MODULE
Expanded Safe-Start Check
The conventional safe-start check, which prevents burner
start-up if flame is indicated at start-up, is expanded to include
a flame signal check during STANDBY and a safety critical
load check.
Off Cycle (Standby) Flame Signal Check
The flame detection subsystem (flame detector and amplifier)
is monitored during STANDBY. If a flame simulating condition
or an actual flame exists for 40 seconds in STANDBY, a safety
shutdown occurs and startup is prevented. If the flame signal
exists at any time after the 40 seconds during STANDBY, a
safety shutdown occurs and is annunciated. The self-checking
detector is energized for the first 40 seconds during
STANDBY and the last two seconds before exiting STANDBY.
If a flame exists after the first 40 seconds during STANDBY,
the self-checking detector is energized during the last ten
seconds of the 40 second flame detection period. If a flame
exists, a safety shutdown occurs.
Safety and logic timings are inaccessible and cannot be
altered or defeated.
Verified Spark Termination
The ignition terminal is monitored to assure early spark
termination (ten seconds ignition and pilot and ten seconds
pilot and main only).
First-Out Annunciation and Self-Diagnostics
Sequence Status Lights (LEDs) provide positive visual
indication of the program sequence: POWER, PILOT, FLAME,
MAIN and ALARM. The green POWER LED blinks every four
seconds, signifying that the RM7824A hardware is running
correctly.
Optional multi-function Keyboard Display Module shows
elapsed time during PILOT IGNITION. As an additional
troubleshooting aid, it provides sequence timing, diagnostic
information and historical information during normal operation
or when a safety shutdown or hold occurs.
First-out Annunciation reports the cause of a safety shutdown
or identifies the cause of a failure to start or continue the
burner control sequence with an English text and numbered
code via the optional Keyboard Display Module. It monitors all
field input circuits, including the flame signal amplifier. The
system distinguishes 39 modes of failure and detects and
annunciates difficult-to-find intermittent failures.
Self-diagnostics add to the First-out Annunciation by allowing
the RM7824A to distinguish between field (external device)
and internal (system related) problems. Faults associated
within the flame detection subsystem or RM7824A are
isolated and reported by the optional Keyboard Display
Module. See the 7800 SERIES System Annunciation
Diagnostics and Troubleshooting, form 65-0118.
65-0155—2

INSTALLATION

WARNING
Fire or Explosion Hazard.
Can cause severer injury, death or property
damage.
To prevent possible hazardous burner operation,
perform verification of safety requirements each time a
control is installed on a burner.
When Installing this Product...
1. Read these instructions carefully. Failure to follow them
could damage the product or cause a hazardous
condition.
2. Check the ratings given in the instructions and marked
on the product to make sure the product is suitable for
your application.
3. Installer must be a trained, experienced, flame
safeguard service technician.
4. After installation is complete, check out the product
operation as provided in these instructions.
WARNING
Electrical Shock Hazard.
Can cause severe injury, death or property
damage.
To prevent electrical shock and equipment damage,
disconnect the power supply before beginning
installation. More than one power supply disconnect
may be involved.
1. To prevent electrical shock and equipment damage,
disconnect the power supply before beginning
installation. More than one power supply disconnect
may be involved.
2. Wiring connections for the RM7824A are unique;
therefore, refer to Fig. 6 or the correct specifications for
proper subbase wiring.
3. Wiring must comply with all applicable codes,
ordinances and regulations.
4. Wiring, where required, must comply with NEC Class 1
wiring.
5. Loads connected to the RM7824A must not exceed
those listed on the RM7824A label or the specifications
(see Table 1).
6. Limits and interlocks must be rated to carry and break
current simultaneously to the ignition transformer, pilot
valve, and main fuel valve(s).
7. All external timers must be listed or component
recognized by authorities who have jurisdiction for the
specific purpose for which they are used.
6