Baxi MULTIFIT Evacuated Tube Collector Kit Instructions page 38

"Basic adjustment"
---
Thermostat
T[ºC]
(Storage top)
dT
10k
TTh
40ºC
on
A3
off
"Basic adjustment"
14 -- 2
15 -- 5
"Basic adjustment"
14 -- 1
15 -- 5
38 © Baxi Heating UK Ltd 2011
Corresponding values in menu
Heating on (A3)
Corresponding values in menu
Corresponding values in menu
14.0 Commissioning of solar controller
14.13 Rotational speed regulation
The solar circulation pump on 230V-outputs A1 and A2 can be
operated either in switch-mode (two-point controller) or in a
rotational speed regulated way.
If the rotational speed regulation is activated the pump power
is adjusted by a controller so that switch-on temperature
difference "Storage tank dTmax" is kept constant as much as
possible. At lower deviation of "Storage tank dTmax" the
pump is operated with the lowest power till the switch-off
wave is reached.
"Programming"
Rotational speed min <100%
14.14 Thermostat (heating)
The thermostat is a control circuit that's independent from the
storage loading. Thus an auxiliary heating in
the top area of the storage cylinder is made possible.
The output A3 will be:
t
• Switched on, when the temperature falls below the adjusted
start level.
• Switched off, when the temperature reaches the adjusted
start level + hysteresis.
"Programming"
Start temperature max ºC
Hysteresis dT in K
Time period (1...3) Start: min time
Time period (1...3) Stop: max time
14.15 Thermostat (cooling)
In order to optimise the energy yield, it could be useful to
"redirect" the solar energy, or to take it away from the storage
when the storage temperature reaches a pre-set level.
When the sensor reaches the start temperature, output A3
will be switched on. When the temperature level falls below
the start temperature hysteresis, the output A3 will be
switched off.
"Programming"
Start temperature max ºC
Hysteresis dT in K
Time period (1...3) Start: min time
Time period (1...3) Stop: max time