Installation - Honeywell 7800 Series Installation Instructions Manual

amplifier and output circuits. The system distinguishes
modes of failure and detects and annunciates difficult-to-
find intermittent failures.
Self-diagnostics add to the First-out Annunciation by
allowing the RM7888A to distinguish between field
(external device) and internal (system related) problems.
Faults associated within the flame detection subsystem or
the RM7888A are isolated and reported by the optional
Keyboard Display Module. See Hold and Fault Message
Summary in the Checkout and Test, form 65-0229.
Interlock Requirements
The following interlock inputs are provided.
Limits Complete (Terminal 7)
This input provides an indication of the status of an
interlock string. If this input is energized, it is permissible
to operate through a burner sequence. The burner
sequence does not leave the Standby state if the Limits
Complete signal is de-energized. If this input becomes de-
energized after leaving the Standby state, one or more
interlocks are open and the burner sequence is either
recycled or a lockout occurs as defined for the particular
burner state.
@Low Fire (Terminal 18)
This input will provide an indication of the low firing rate
position. If this input is energized, the motor position is
assumed by the relay module to be at the Low Fire position;
otherwise, the motor position cannot be determined if this
input is de-energized.
This signal is readable in any burner operating state
without regard to the status of the special function signals
or the Limits Complete signal. The RM7888 does not
perform a test to assure that the Low Fire input signal
becomes energized when the High Fire motor control is
commanded. For example, the RM7888 will not detect a
Low Fire input that is jumpered or continuously energized
without regard to the actual motor position.
The High Fire position is not confirmed by a separate high
fire input at the RM7888. The system master control is
responsible for the High Fire proving and purging of the
combustion unit.

INSTALLATION

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.
RM7888A 7800 SERIES RELAY MODULE
When Installing This Product...
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazard-
ous 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 safe-
guard service technician.
4. After installation is complete, check out the product
operation as provided in these instructions.
CAUTION
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 RM7888A are unique;
therefore, refer to Fig. 11 or the correct specifica-
tions for proper subbase wiring.
3. Wiring must comply with all applicable codes, ordi-
nances and regulations.
4. Wiring, where required, must comply with NEC Class
1 (Line Voltage) wiring.
5. Loads connected to the RM7888A must not exceed
those listed on the RM7888A label or the specifica-
tions (see Table 1).
6. Limits and interlocks must be rated to carry and
break current simultaneously to the ignition trans-
former, pilot valve, and main fuel valve(s).
7. All external timers must be listed or component rec-
ognized by authorities who have jurisdiction for the
specific application.
11 32-00214—01