Operation manual of SR528Q wireless controller
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CMX sign displays on the screen, it indicates that collector cooling function is
activated.
6.4.4 CMN Low temperature protection of collector
Description:
When the actual temperature of collector is below the preset CMN temperature, solar circuit
pump is ceased, even when the temperature difference between collector and storage
exceeds switch-
on temperature difference, solar pump doesn’t work yet. When the
temperature of collector is 3
o
C higher than the preset CMN temperature, solar circuit pump
is standby to work, controller exits this program.
Setup steps
:
To access main menu TEMP, then select submenu CMN
, “CMN - - -” shows on the screen,
default set is OFF.
►Press “Set” button, default off sign “- - -” blinks on the
screen.
►Repress “Set” button to activate and deactivate this
function.
►Press
“▲ ▼
” button to adjust the low protection temperature of collector CMN,
adjustable range (00
o
C
～
90
o
C ), after activate the function, factory set is 10
o
C
► Press “Esc” button to exit the menu or wait for 20 seconds to exit automatically,
parameters are saved automatically.
CMN sign displays on the screen, it indicates that this function is activated.
6.4.5 CFR frost protection temperature 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
rises 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
