36
Controller settings
The Firebird solar controller is factory-set and there should be little need to change system settings.
Factory settings for key parameters are:
Anti Legionella function
The controller supplied with the Firebird control pump station has an anti-Legionella function that monitors the
temperature through the sensor at the top of the tank. This records if the temperature of the water within the
tank has reached the desired 60˚C requirement within a specific period of time. If the temperature is not reached,
then a back up heat source is activated, heating the tank until the required temperature is reached, hence
eliminating the risk of Legionella risk.
It is necessary that the second relay (R2) is connected to a heat source i.e. immersion or boiler pump for this
function to operate. For additional details please refer to the Firebird Controller Installation Manual.
9.9
Installing Expansion Vessel
9.9.1 Expansion vessel
As with any sealed system, the pumped circulation solar system has to have an
expansion capability to cope with fluid expanding as the temperature increases. A
suitably sized expansion vessel must be selected, large enough to accommodate
the content of the collector when steam forms (stagnation). This is to ensure that
no heat transfer medium can escape from the safety valve.
Installation of expansion vessel:
•
The vessel must only be installed in a vertical position.
•
The vessel connection must face upwards.
•
The charge pressure of the vessel should be checked and set at the required
pressure for the size of the system.
•
The fill pressure of the system should be approximately 0.3 bar greater than
the charge pressure of the vessel.
Parameter
Description
Factory setting
DT 0
Switch ON temp. differential
6˚C
DT F
Switch OFF temp. differential
4˚C
S Mx
Maximum store temperature
60˚C
AH 0
Switch ON temperature for
40˚C
back-up heat source, i.e. boiler
(based on upper tank temp. S3)
AH F
Switch OFF temperature for
45˚C
back-up heat source, i.e. boiler
Vessel (litre)
Charge pressure (bar)
System pressure (bar)
24
2
2.3
35
2
2.3
INSTALLATION
