Operation manual of solar water controller SR868C8/SR868C8Q
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- 21 -
exceeds switch-
on temperature difference, solar pump doesn’t work yet. When
temperature of collector is 3
o
C higher that the preset CMN temperature, solar circuit
pump is restarted, controller exits this program.
Setup steps
:
To access main menu TEMP, then select submenu CMN, “CMN
- - -
” displays on
screen, default set is off.
►Press “SET” button, default off signal “- - -” blinks on screen.
►Repress “SET” button, to activate and deactivate this function
►Press “+”“-” button, to adjust the low protection temperature of collector CMN,
adjustable range (00
℃～
90
℃
), after activate the function, factory set is 10
℃
► Press “ESC” button to exit the menu or wait for 20 seconds to exit automatically,
parameters are saved automatically.
CMN signal displays on screen, it indicates that this function is in activated.
4.5.4 CFR frost protection of collector
Description:
In winter when the temperature of collector is below the preset frost protection
temperature (factory set is 4
o
C), Solar circuit pump is triggered. Besides when tank
temperature (T2) drops to 4
o
C, electrical heater is triggered automatically and it is in
operation until T2 is heated up to 20
o
C or it is stopped when program of CFR is exited.
When collector temperature rises up to 7
o
C, solar circuit pump is ceased, program of
CFR exits automatically.
This function is used in system, which use water as heat transfer liquid, to avoid the
freezing of solar heat transfer fluid.
Setup steps:
To access main menu TEMP, then select submenu CFR, “CFR
- - -
” displays on screen,
default set is off.
►Press “SET” button, default off “- - -” blinks.
►Repress “SET” button, to activate or
deactivate this function
