SR971,SR972 Solar station operation manual
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35
7.6.4 Submenu -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. When tank temperature ( T2) drops to 6
o
C, electrical heater is triggered , it works until tank temperature rises up to 20
o
C, or it is
ceased 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
►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, parameters are saved
automatically.
CFR signal displays on screen, it indicates this function is activated.
Note:
this function is only available in special solar system which using no-anti-freezing
liquid; this kind of system is only suitable in area where the ambient temperature is near to
0
o
C in only few days. If safety requirement is very high , then anti-freezing is necessary, we
suggest to use suitable anti-freezing liquid to avoid frost problem
