Solar working station operation manual SR881
- 28 -
►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.
4.4.5 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 to circuit solar liquid reversed. Besides
when tank temperature (T2) drops to 6
o
C, electrical heater is triggered automatically and it is
in operation until T2 is heated up to 21
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 systems, 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
►Press “+”“-” button, to adjust the frost protection function, adjustable range is
（
-10
℃～
10
℃），
after function activated, default set is 4
℃
► Press
“ESC”
button to exit the menu or wait for 20 seconds to exit automatically,
parameters are saved automatically.
CFR signal displays on screen, it indicates that this function is activated.
Note:
this function is only available in special solar system which using no-anti-freezing
