Heatrae Sadia Megaflo Eco SolaReady, Instructions Manual

Page: 32 / 52

COMMISSIONING
32
PROTECTIVE FUNCTIONS
The controller is equipped with the following protective functions.
1. COLLECTOR PROTECTION
If the storage tank has reached the set maximum temperature and the
collector temperature exceeds the set collector protection temperature
(line 1), the solar circuit pump is switched on. The solar circuit pump is
switched off once the collector temperature is 10 K below the maximum
value.
In this case, the storage tank is charged to 95° C, regardless of the set
maximum temperature.
2. RECOOLING (HOLIDAY FUNCTION)
The collector protection function is only effective if the storage tank
temperature is below the temperature limit (95°). During a holiday period,
for example, the storage tank must therefore be discharged at night to the
set recooling temperature.
WARNING:
do not activate this function at the same time as backup
heating!
“Basic Setup” menu
Display
Meaning
Value
range
Factory
setting
Line Value
3 0
Collector protection function on/off 0 = Off
1 = On
0
4 120ºC
Temperature at which the
collector protection function
activates
110-150ºC 120ºC
5 0
Recooling protection function
on/off (only if collector
protection is on)
0 = Off
1 = On
0
6 40ºC
Temperature to which the
storage tank is recooled with
collector protection function
activated
30-90ºC 40ºC
3. SYSTEM PROTECTION
To protect system components, the solar circuit pump is switched off if the
collector temperature exceeds the collector protection temperature (see
Recooling (Holiday function)) by 10 K. If the temperature drops below the
collector protection temperature, the solar circuit pump is switched on.
This function is always activated.
4. ANTI-FREEZE PROTECTION
This function must be activated if the water or glycol mixture can freeze.
If the temperature at the anti-freeze sensor (line 12) drops below the set
value, the solar circuit pump is activated and heats the solar circuit using
the heat exchanger in the storage tank.
“Basic Setup” menu
Display
Meaning Value range Factory
setting
Line Value
14 0
Anti-freeze protection
functional on/off
0 = Off
1 = On
0
15 6
Selects the sensor for the
anti-freeze protection function
1-6 6
16 3
Temperature at which the
anti-freeze protection function
activates
-20ºC - +7ºC 0
ADDITIONAL FUNCTION
1. ENERGY YIELD MEASUREMENT
The energy yield of the solar power system is calculated and displayed
using the temperature difference between the collector and collector
return temperature, plus the measured flow rate.
Accessories required:
Energy yield set
(consists of flow transmitter and tube sensor) or Grun -
dfos sensor.
“Basic Setup” menu
Display
Meaning Value range
Factory
setting
Line Value
8 0
Energy yield
measurement function
on/off (sensor selection)
0 = Off
1 = Flow transmitter
2 = VFS
0 = Off
9 1,0
Show if flow transmitter on
(6-1): Litres/pulse
0,5 - 25l/pulse
0.5 increments
1,0
10 20
Shown id VFS on (6-2):
VFS type 1-20 or 2-40
20 = 1-20
40 = 2-40
20
Please note: The tube sensor (T4) is only necessary when measuring
energy yield with a flow transmitter (DFG).
With a Grundfos sensor (VFS), the sensor is already integrated and se-
lection is automatic.
SYSTEM MONITORING
The occurrence of errors is generally indicated by a flashing
!
symbol.
1. SENSOR MONITORING
The connected sensors and sensor cables are monitored for interruptions
and short-circuits. Errors are indicated by the
!
symbol. The source of
the error can be found by scrolling up or down in the Info menu.
2. FLOW MONITORING
The controllers are programmed so as to display a message if the flow
is interrupted, e.g. via pump fault or vapour in the system. However, this
notification does not switch off the pump.
“Basic Setup” menu
Display Meaning
+ No circulation in solar circuit
!