9
USER’S INFORMATION MANUAL
TANKLESS WATER HEATER 199
SEQUENCE OF OPERATION
When the unit is powered up the controller enters a self-diagnostic mode, and
displays the controller software version in the main display.
The Sequence of Operation is as follows:
1. The unit receives a call from Domestic Hot Water heating from the internal
ow sensor.
2. The unit performs a safety check and energizes the fan for a pre-purge
(Service Display = 3).
3. Once the 5-second pre-purge is compete, the unit enters a 5-second trial for
ignition (Service Display = 4). If the unit fails to ignite, the unit will complete a
5-second inter-purge then another 5-second trial for ignition. This is repeated
4 times before a hard lock-out occurs. The Return button must be pressed to
reset the controller and to allow for another attempt.
4. Once the burner is lit and ame has been proven the boiler operates as it is
programmed (Service Display = for Domestic Hot Water).
5. If the unit exceeds its target temperature and there is still a call for hot water
the burner will turn o. (Service Display = 1)
6. If the burner is on to maintain the heat exchanger temperature for DHW
Comfort mode (Service Display = 7).
7. If the burner is on for frost protection (Service Display = 9).
MAIN
DISPLAY
LIT
DISPLAY
DESCRIPTION
OFF - The unit is OFF. Press the space above the Dot for 2
seconds to turn on the unit
.
(blank) (blank) No Call for Hot Water - Standby
XXX 2 Self-test – When power is applied to the unit the
controller enters a self diagnostic mode for 5 seconds
XXX 3 Fan Pre-purge and Post-purge
XXX 4 Trial for Ignition and Flame Proving
XXX + Heating – DHW
XXX 7 Burner on for Comfort mode
XXX
9
Freeze Protection mode
Table 2: Operating Display and Service Display Codes.
NOTE
The unit is equipped with a
Frost Protection feature. This
feature will operate the unit’s
burner to help protect the unit
from freezing. If the unit is
in a hard lock-out condition
the burner will not operate.
We are not responsible for
damages to the unit, and/
or related components,
nor property damages that
may result from freezing
conditions.
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