SR971,SR972 Solar station operation manual
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30
7.5 Main menu - DT Temperature difference function
Description:
Solar circuit pump R1 is triggered by the temperature difference function, so long as the
temperature difference between collector and tank reaches the switch-on DT, solar circuit
pump is triggered.
For example: the switch-on DT is 8
o
C, switch-off DT is 4
o
C, if the temperature in the bottom
of tank is 20
o
C, then just when collector temperature rises up to 28
o
C, pump is triggered, and
when collector temperature drops to 24
o
C, pump is ceased.
Note:
the switch-on/off DT of 8
o
C and 4
o
C are standard system setting according to many
years’ experience, only in special application cases it needs to be changed, (e.g far distance
heat transferring), normally it is recommend to use default set. Switch-on and switch-off DT
are alternating set. To avoid mistake the minimum difference between two temperature
differences (ΔTon –ΔToff) is set as 2
o
C.
Setup the switch-on/ switch - off temperature difference:
Under standby status, access main menu DT
►Press “SET” button, to access settings program of DT ,
“DT 1o 08
℃
” displays on screen, “08
℃
” blinks, the
switch-on temperature difference can be set.
►Press “ ” button, to adjust the value of
switch-on DT, adjustable range (OFF+2
℃）～
20
℃，
factory
setting is 8
℃
►Press “ESC” button to exit this setting, parameter is saved automatically.
►Press “ ” button, to access setting first switch-off
temperature difference
, “DT 1F 04
℃
” displays on screen,
►Press “SET” button, “04
℃
” blinks,
►Press “ ” button to adjust the value of
switch-off DT, adjustable range 0
℃～（
ON-2
℃），
factory
set is 4
℃
.
►Press “ESC” to exit menu, or wait for 20 seconds to exit automatically, the setup
