SR1128 operation manual
~20~
CMN signal displays on screen, it indicates that this function is activated.
5.3.5 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 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
raises 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 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 ----” 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 temperature of frost
protection function, adjustable range is ˄-10
o
C10
o
C˅ˈ after function activated, default
set is 4
o
C
► 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
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 is necessary,
we suggest using suitable anti-freezing liquid to avoid frost problem.
5.3.6 REC Storage re-cooling function
Description:
If storage temperature rises up to its maximum temperature, and at the same time, collector
temperature is 5
o
C lower than storage temperature, then solar pump can be triggered,
To Next Page