SR882 operation manual
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4. Controller functions and parameters setup (engineer grade)
4.1 Access main menu
Under standby status, doing like following to access main menu
►Press “SET” button and then press “+” three times, “PWD 0000”displays on screen, then
press “SET” button again, the left first digital blinks, ask for entering password, factory
default password is “ 0000”
►Press “+”“-” button to enter first digital of password.
►Press “SET” button again, the second digital blinks
►Press “+”“-” button, to enter second digital of
password
►Press “SET” button again, the third digital blinks
►Press “+”“-” button to enter the third digital of password
►Press “SET” button again, the fourth digital blinks
►Press “+”“-” button, to enter the fourth digital of password
►Press “SET” button again to access main menu
►Press “+”“-” button, to select the desired main menu for parameter setting
►Press “ESC” button to exit main menu
Note: factory set password is “0000”, if don’t set new password, then continuously press
“SET” button four times to access main menu.
4.2 DT Temperature difference function
Description:
Solar circuit pump P1 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
part 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 recommended using 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.
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