GH10NA USER MANUAL
PAGE
17
Issue I
AUGUST 2017
10.
TEMPERATURE LIMITER (STB)
The GH10NA Controller can be equipped with an additional independent temperature limiter STB via
terminals 15 and 16.
WHEN THE TEMPERATURE LIMITER IS NOT USED, TERMINALS 15
AND 16 SHOULD BE SHORTED.
If due to boiler temperature rise the temperature limiter is activated and opens its terminals, it will disable
feeder and fan power supply in order to stop fuel and air delivery do the boiler. After approximately 5s from
limiter activation the Controller indicates the AL1 alarm.
Return to normal boiler operation is possible when the boiler temperature drops to a level enabling limiter
reset (temperature level depends on the limiter model used).
For safety reasons the Controller does not resume automatic operation on its own.
For the Controller to resume operation you have to, after resetting the limiter, press
twice:
– pressing
for the first time cancels the alarm and disables the Controller,
– pressing
for the second time reactivates the Controller,
– pressing
causes the Controller to switch to automatic operation mode.
CAPILLARY TUBE PUNCTURE OR BREAKAGE INDICATES THAT
TEMPERATURE LIMITER FILLED WITH LIQUID LEAKS, WHICH RESULTS IN
ABNORMAL OPERATION OF THE GH10NA CONTROLLER.
IN CASE IF THE ABOVE-MENTIONED DEFECT IS FOUND, IT WILL BE
NECESSARY TO DISCONNECT TEMPERATURE LIMITER FROM THE
GH10NA CONTROLLER, REMOVE IT AND REPLACE WITH A NEW DEVICE.
