KDB-GOM
Series
- 33 -
ON/OFF Control Range
Set Temperatures (“T” set)
ON
OFF
80
℃
“T” set - (18
±
2)
℃
“T” set - (5
±
2)
℃
70 ~ 77
℃
“T” set - (14
±
2)
℃
“T” set - (7
±
2)
℃
60 ~ 69
℃
“T” set - (12
±
2)
℃
“T” set - (6
±
2)
℃
50 ~ 59
℃
“T” set - (10
±
2)
℃
“T” set - (5
±
2)
℃
40 ~ 49
℃
“T” set - (8
±
2)
℃
“T” set - (4
±
2)
℃
30 ~ 39
℃
“T” set - (6
±
2)
℃
“T” set - (3
±
2)
℃
If the combustion is delayed due to the temperature increase as above, the pump will be continuously run and the
resumption of combustion will be delayed for 300
±
30 seconds. (If the combustion stops at 85
℃
, the forced delay of 300
seconds will not be executed.)
If other functions than the heating, such as a different function or change in the set temperature, is performed during the
heating time or forced stop time, the time should be changed to the initial value.(In the case of heating domestic hot water
supply, the boiler will not be stopped.)
4.18.2.21 Re-Use Standby after Use Domestic Hot Water
When hot water flow switch is OFF by stopping use of hot water, fuel supply stop. Fan doesn’t perform Post-Purge
caused by stopping fuel supply and maintains ON status for 90
±
9 seconds. If hot water flow switch is ON within this time,
performs pre-Ignition, fuel supply, flame detection, and Post-Ignition. And return the status as before when expires 90
±
9
seconds after using hot water.
Only if the heating signal is input in the temperature controller during hot water standby (90
±
9 seconds) or after hot
flow switch is OFF, turn immediately to heating. At this time, combustion should start always from the beginning after
combustion is OFF, and Post-Purge time is 15
±
3 seconds and hot water standby time progress separately.
4.18.2.22 Freezing Prevention
When heating water temperature is lowered less than 10
±
2.0
℃
, circulation pump operates for 30
±
2 seconds by the
interval of one hour. If circulated water temperature is lowered less than 6
±
2.0
℃
, operates circulation pump and starts
combustion for freezing prevention after output of freezing running in temperature controller. When the heating water
temperature is more than 21
±
2.0
℃
, the circulation pump and combustion stop.
4.18.2.23 The Number of Fan Rotation Trouble
The RPM signal monitors after running fan and the related status is indicated in the temperature controller as follows.
- After reaching within ignition rpm
±
200rpm during ignition, ignition is started by controlling gas valve. If it doesn’t reach
within 13
±
2 seconds, consider as one time failure of ignition. When re-ignition is performed and it doesn’t reach for 3
times in series within 13
±
2 seconds, stop the ignition. After perform purge for 15
±
2 seconds, start re-ignition again.
(Only if repeats for 10 times of the above operation and doesn’t ignite, consider as the number of rotation trouble.)
- If ignite normally and progress the combustion, initialize the count of above operation.
- If the number of rotation maintains less than 400
±
200rpm or more than 3200
±
200rpm for 12
±
1 seconds during
normal combustion, consider as the RPM trouble.
- When the RPM trouble is happens by the above mention, re-check trouble of blower for 30
±
3 seconds after indicating
first the trouble status in the temperature controller. If decide as normal status (1000
±
200rpm), release it automatically
and return to normal status.
4.18.2.24 Bimetal (Mechanical Type) Overheat Control
When overheat signal is monitored continuously for 1
±
1 second from mechanical overheat sensor during combustion
and stopping, transmits bimetal overheat status to the temperature controller and safety shut-off performs. Fan and
circulation pump operate continuously and stop when heating water temperature is less than 80
±
2.0
℃
.
4.18.2.25 DIP Switch Setting Trouble
The voltage of wind pressure switch is always monitored during combustion and stopping of the boiler, and it is
compared with current setting of DIP switch. When finds trouble, indicates trouble status in the temperature controller and
stops combustion. (Only if set normal status, release automatically.)
