KDB-GOM
Series
- 10 -
2.3.4 Controls of the Domestic Water Temperature
2.3.4.1 Possible use of hot water in heating/not-at-home mode and hot water exclusive mode, according to the
flow volume detection of the hot water sensor.
2.3.4.2 Indirect control of the hot water temperature based on the heating water temperature.
2.3.4.3 Control at 80
℃
when using hot water during heating.
2.3.4.4 Control at 70
℃
when not-at-home or hot water exclusive mode
2.3.4.5 Stand by after hot water use
y
when stopped after hot water use, the fan does not perform post purge and maintain the ON status for 90
seconds.
y
the pump stops after the post purge (60 seconds)
y
when using hot water again and after the hot water sensor detects the flow volume
pre-ignition
Æ
fuel supply
Æ
flame detection
Æ
post-ignition
y
return to the before-hot-water-use status 90 seconds after the use of hot water.
2.3.4.6 Combustion in progress while in stand-by for hot water (90 seconds) or after 12 seconds of the post purge
time ( while in heating mode after the hot water sensor if “OFF”). Hot water stand-by time in progress separately.
3. Equipment Protection and Personal Safety
A. Ignition Failure
If the ignition fails, the gas supply is automatically cut off. An error code will appear as a flashing 2-digit code on the room
thermostat(models FR-5 only). The error codes are discussed in the troubleshooting section of the installation manual.
B. Flame Detection
If the fails and/or the re-ignition attempt fails, the gas supply is automatically cut off. An error code will appear on the room
thermostat(models FR-5 only).
C. Power Interruption
When the power is restored after a power failure, the boiler will automatically start and return to normal
operation(Manual reset is not required).
D. Excessive Air Pressure
Occasionally an excessive gust of wind from outside may be forced into the flue pipe. The air-ratio control module
will detect these strong back-drafts. To prevent any products of combustion from re-entering the building through the
open flue, the gas supply will be automatically cut off. An error code will appear on the room thermostat(models FR-
5 only).
E. Explosive Re-ignition Protection
Abrupt, noisy startups and backfires are prevented by means of
soft ignition
, a trademark of our air-ratio control
module.
F. Overheat Protection
Any overheating of the burners or heat exchanger will automatically shut down the supply of gas to the burners.
An error code will appear on the room thermostat(models FR-5 only).
G. Low Water-Level Safety
Water levels in the heating pipes are continuously monitored to prevent the boiler from operating if there is no
water or a restricted flow through the piping. The boiler will automatically shut down and an error code will appear
on the room thermostat(models FR-5 only).
