Start System - Honeywell R8991 Manual

External Action
Connect line voltage power.
There is no call for heat.
Thermostat calls for heat.
Cad cell senses flame within lockout
time.
Thermostat call for heat is satisfied.
Burner fails to ignite on call for heat. Burner motor and ignition are turned off at end of lockout time.
Burner ignites, but flame fails prior
to lockout time.
Burner ignites, but flame fails after
lockout time and during Ignition
Carryover.
Flame fails during burner-on cycle.
Power fails during call for heat.
Power fails during recycle mode.
Power fails during lockout mode.
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During lockout, the green diagnostic light starts flashing at 2 Hz (1/4 second on, 1/4 second off). Reset R8991 by pushing in
and releasing the red reset button. The green diagnostic light stops flashing and goes off. If there is a call for heat, the R8991
returns to a try for ignition.
CAUTION
To prevent damage to the R8991, do not use an
ignition tester to check out the R8991 Ignition
Source. Iron core transformer ignition testers can
damage solid state ignitors.
CAUTION
When using R8991 with a 24V thermostat, discon-
nect at least one lead wire from the T1-T2 ter-
minals on R8991 before jumpering T1-T2 to
simulate a call for heat or damage to thermostat
heat anticipator can result.
IMPORTANT: Only a trained, experienced service tech-
nician should perform the checkout procedure.
NOTE: The reset button can also be used to return the
R8991 to the idle mode during trial for ignition, ignition
carryover, or run mode by pressing in and holding down
the button. When the reset button is released, the R8991
TABLE 1—R8991 OPERATION.
R8991 is energized if limit switch is closed.
Green diagnostic light is on if cad cell senses flame. Green light is off if cad
cell does not sense flame.
R8991 does not try for ignition if cad cell senses flame. If cad cell does not
sense flame, burner is energized after a one second delay and ignition is on.
NOTE: The ignition on is a pulsing action. See description above this table.
Diagnostic light and ignition are on. Ignition continues for 45 seconds after
cad cell senses flame (Ignition Carryover), then turns off. Burner is running.
Burner stops. Diagnostic light turns off.
Green diagnostic light turns off.
Ignition remains on until either cad cell senses flame or lockout time ends.
If flame was not re-established, the R8991 locks out.
Burner shuts off. R8991 enters recycle mode and the green diagnostic light
flashes at 1/4 Hz (2 seconds on, 2 seconds off). The control waits 60 seconds
before attempting to restart.
Burner shuts off. R8991 enters recycle mode and the green diagnostic light
flashes at 1/4 Hz (2 seconds on, 2 seconds off). The control waits 60 seconds
before attempting to restart.
Burner shuts off safely. R8991 automatically attempts to relight with all safety
checks when power is restored.
When power is restored, R8991 will not respond to a call for heat until a full
60 second recycle period is complete.
R8991 remains locked out.
When power is restored, R8991 stays in lockout mode.
Checkout
3
R8991 Action
initiates a trial for ignition if a call for heat continues.
This facilitates system checkout by simulating that the
thermostat is not calling for heat (pressing in and holding
down the button) without changing the thermostat setting.

START SYSTEM

WARNING
FIRE OR EXPLOSION HAZARD.
CAN CAUSE PROPERTY DAMAGE,
SEVERE INJURY OR DEATH.
Make sure combustion chamber is free of oil or oil
vapor before starting the system.
1. Make sure the system is powered. Check the circuit
breaker or fuse and close the system switch, if provided. If
indicator light is flashing at 1/4 Hz (2 seconds on, 2 seconds
off), this indicates that the control is in the recycle mode. Wait
60 seconds for the recycle period to end. After 60 seconds,
the indicator light stops flashing.
2. If indicator light is flashing at 2 Hz (1/4 second on,
1/4 second off), indicating that the control is locked out, push
in and release the red reset button on the R8991 Interrupted
Ignition Recycle Oil Primary and Ignitor. The light should
stop flashing.
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a
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69-0669B—2