SR981S/SR982S operation manual of solar pump station
Page 50 of 85
parameters are saved automatically.
CMN sign displays on the screen, it indicates that this function is activated.
8.4.4 CFR frost protection temperature of collector
Description:
In winter when the temperature of collector is below the preset frost protection temperature
(CFR) (factory set is 4
o
C), solar circuit pump is triggered to transfer hot water from tank to
collector and to heat collector by this reversed circuit. And when tank temperature (T2)
drops to 6
o
C, electrical heater is triggered automatically and it keeps running until tank
temperature T2 rises up to 20
o
C or it is stopped when program of CFR is exited. And 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 uses 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 - - -” shows on the 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 temperature of frost protection function,
adjustable range is
（
-10
o
C
～
10
o
C
）
, after function is activated, default set is 4
o
C
► Press “ESC” button to exit the menu or wait for 20 seconds to exit, parameters are
saved automatically.
CFR sign shows on the screen, it indicates that this function is activated.
Note:
this function is only available in special solar system which using un-anti-freezing
liquid; this kind of system is only suitable in area where the ambient temperature is near to
0
o
C only for a few days. If safety requirement is very high, then anti-freezing liquid is
necessary, we suggest using suitable anti-freezing liquid to avoid frost problem.
