SR882 operation manual
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4.3.5 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 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 temperature of 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
liquid; this kind of system is only suitable in area where the ambient temperature is near to
0
o
C for only 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.
4.3.6 REC Tank re-cooling function
Description:
If tank temperature is over tank’s maximum temperature, and at the same time, collector
temperature is 5
o
C lower than tank temperature, then solar pump can be triggered, through
this reversed circulation, tank temperature is decreased by heat loss occurs in collector,
solar pump keeps in working until tank temperature drops below its maximum temperature.
