Hello, and advice.
For some time I have been trying to master a furnace that overheats in work with the room regulator attached and in boiler priority mode. 19 kW SAS Solid eco-coal furnace, house 245 m2, 205 m2 of usable space (garage and boiler room virtually unheated ...), 25 m2 flooring on two levels altogether, a well-insulated house was built last year, efficient heaters with thermostatic heads, ST-550 controller with PID, Tech ST-298 controller, 140 l boiler with coil, closed circuit, manual mixing valve ...
The problem is not noticeable when the room regulator control is turned off, when the furnace temperature is low 53-55 degrees, temperature fluctuations up to 6-7 degrees above the set point. There is nothing disturbing even when it has been warmer recently and the house takes on a hill temperature (over 22 degrees), it was not exceeded on the stove. But even when it was recently to about - 15 degrees and I tried to turn on the room regulator control, or turn on the boiler priority to make the water warm up faster, the effect is overheating of the furnace to several degrees above the set temperature. The furnace works in PID mode. I had a problem and worries when the oven was set at 60 degrees ... I have already checked various combinations of settings and nothing without switching off the controller has no effect. Currently, after plumber advice, I have a 55-degree oven, 50-degree DHW with 4-degree hysteresis, a mixing valve at 4 on a scale of 10, I tried to reduce the furnace rating by 83%, at -2 outside today I observed 63 degrees CO, and certainly there is no question of switching on the regulator (total failure with CO control) and I can not use the boiler priority ... Is lowering the furnace nominal is a good lead, anyone have any idea ?? The eco-peas burns out nicely, a sack went a day in cold weather, less than half lately, probably quite well with a new home ...
For some time I have been trying to master a furnace that overheats in work with the room regulator attached and in boiler priority mode. 19 kW SAS Solid eco-coal furnace, house 245 m2, 205 m2 of usable space (garage and boiler room virtually unheated ...), 25 m2 flooring on two levels altogether, a well-insulated house was built last year, efficient heaters with thermostatic heads, ST-550 controller with PID, Tech ST-298 controller, 140 l boiler with coil, closed circuit, manual mixing valve ...
The problem is not noticeable when the room regulator control is turned off, when the furnace temperature is low 53-55 degrees, temperature fluctuations up to 6-7 degrees above the set point. There is nothing disturbing even when it has been warmer recently and the house takes on a hill temperature (over 22 degrees), it was not exceeded on the stove. But even when it was recently to about - 15 degrees and I tried to turn on the room regulator control, or turn on the boiler priority to make the water warm up faster, the effect is overheating of the furnace to several degrees above the set temperature. The furnace works in PID mode. I had a problem and worries when the oven was set at 60 degrees ... I have already checked various combinations of settings and nothing without switching off the controller has no effect. Currently, after plumber advice, I have a 55-degree oven, 50-degree DHW with 4-degree hysteresis, a mixing valve at 4 on a scale of 10, I tried to reduce the furnace rating by 83%, at -2 outside today I observed 63 degrees CO, and certainly there is no question of switching on the regulator (total failure with CO control) and I can not use the boiler priority ... Is lowering the furnace nominal is a good lead, anyone have any idea ?? The eco-peas burns out nicely, a sack went a day in cold weather, less than half lately, probably quite well with a new home ...
