32
6.
Boiler operation by user
6.1
Control, regulation and security elements
6.1.1 Saphir regulator
SAPHIR ACX 38 is the regulator destined for solid fuel boiler control, heating circuit control and hot water
preparation by means of external reservoir control. The regulator is equipped with boiler sensor, hot water
sensor or hot water thermostat (depending on the pump or mixing heating circuit), heating branch sensor
(mixing heating circuit), sensor against the fire penetration and outside sensor. The regulator co-operates
with QAA 88 device that can be used as space device or boiler display.
The regulator is equipped with two software regimes (pump or mixing heating circuit) that can be switched
over by means of system reverser of S1 regulator. The regulator system reverser is installed in the regulator
in its right-hand lower part.
A. Pump heating circuit
The right-hand segment of S1 switch is in position off.
•
heating circuit (HC) – at the pump heating circuit there is not used the three-way mixing valve
SQK 34. If the outside sensor is installed the boiler operation is controlled equithermally. The heating
water temperature varies in the range of setting from the min. boiler temperature to the max heating
circuit temperature. If the outside sensor is not installed (it must be deactivated) the boiler operation
is controlled by the space device. In case of outside sensor fault the boiler heats to the fixed
temperature (set by manufacturer to 70
o
C).
•
warm water (HW) – HW preparation is solved by means of HW sensor, three-way valve and HW
external reservoir. In case of HW preparation the boiler temperature is increased (set by
manufacturer to 15
o
C) against the desired warm water temperature.
•
boiler
a)
automatic regime – the boiler is controlled by the heat requirement (heating branch, warm
water and min. boiler temperature). The boiler output is given by the current heat requirement
modulated in the sphere of output range. The ventilator output is controlled by the change in
revolutions and the fuel quantity is allocated adequately to the air volume. The boiler
temperature increase against the heating branch desired temperature is 5 °C (set by the
manufacturer).
b) attenuation regime – after the requirement for heat has ceased the boiler goes over to the
attenuation regime. The minimum boiler temperature is kept in the attenuation regime.
•
Boiler pump – the pump is switched on when 55°C has been reached (set by the manufacturer).
The pump is switched off when the temperature has dropped by 5°C against the setting by the
manufacturer. In the attenuation regime the pump is switched on at the temperature 70 °C and
switched off when the temperature has dropped by 5°C.
•
boiler antifreeze protection- it depends on the actual water temperature in the boiler. In case the
water temperature in the boiler has dropped below 5°C the boiler pump will switch on.
B. Mixing heating circuit
The right-hand segment of S1 switch is in position on.
•
heating circuit (HC) – at the mixing heating circuit there is used the three-way mixing valve SQK 34.
If the outside sensor is installed the boiler is controlled equithermally. The heating water temperature
varies in the range of setting from the min. heating circuit temperature to the maximum set heating
circuit temperature. The three-way mixing valve is mixing the heating water to the desired
temperature. If the outside sensor is not installed (it must be deactivated) the boiler operation is
controlled by the space device. In case of outside sensor fault the boiler heats to the fixed
temperature (set by manufacturer to 70
o
C).
•
warm water (HW) – HW preparation is solved by means of HW thermostat, charging pump and HW
external reservoir. In case of HW preparation the boiler temperature is increased (set by
manufacturer to 15
o
C) against the desired warm water temperature. The temperature set on the
reservoir thermostat must correspond to the set desired temperature in the table of parameters. HW
pump is switched on by the requirement for warm water. After the requirement for warm water has
ceased the pump is in slowing-down regime. If the boiler temperature drops at least by 3 °C against
the desired HW temperature plus the increase (set by manufacturer to 15
o
C) HW pump will not
operate. If this limitation is active then HC pump will not operate either.
•
boiler
a) automatic regime – boiler is controlled by the heat requirement (heating branch, warm water and
minimum boiler temperature). The boiler output is given by the actual heat requirement modulated
in the sphere of output range. The ventilator output is controlled by the change in revolutions and
