Installation - Honeywell 7800 SERIES Manual

during the last 10 seconds of the 40 second flame detection
period. If a flame exists, a safety shutdown occurs. An
AMPLI-CHECK™ Amplifier is energized continually
through STANDBY to detect any possibility of a runaway
detector or a flame. If a flame exists, a safety shutdown
occurs. A standard amplifier is energized continually through
STANDBY, if a flame exists a safety shutdown occurs.
TAMPER RESISTANT TIMING AND LOGIC
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 RM7890
!
WARNING
FIRE OR EXPLOSION HAZARD
CAN CAUSE PROPERTY DAMAGE,
SEVERE INJURY, OR DEATH
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 condi-
tion.
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 safe-
guard service technician.
4. After installation is complete, check out the product
operation as provided in these instructions.
SAFETY PROVISIONS • INSTALLATION
hardware is running correctly.
Optional multi-function Keyboard Display Module shows
elapsed time during PILOT IGN. As an additional trouble-
shooting aid, it provides sequence timing, diagnostic infor-
mation, historical information and expanded annunciator
information during normal operation or when a safety shut-
down or hold occurs.
First-out Annunciation reports the cause of a safety shut-
down 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
failures.
Self-Diagnostics add to the First-out Annunciation by
allowing the RM7890 to distinguish between field (external
device) and internal (system related) problems. Faults asso-
ciated within the flame detection subsystem or RM7890 are
isolated and reported by the optional Keyboard Display
Module. See the 7800 SERIES System Annunciation Diag-
nostics and Troubleshooting, form 65-0118.
!
CAUTION
1. Disconnect the power supply before beginning
installation to prevent electrical shock and equip-
ment damage. More than one power supply
disconnect may be involved.
2. Wiring connections for the RM7890 are unique;
therefore, refer to Fig. 7 or the correct Specifica-
tions 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 (Line Voltage) wiring.
5. Loads connected to the RM7890 must not ex-
ceed those listed on the RM7890 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.
9
RM7890A,B,C
intermittent

Installation

65-0126—2