Instruction of SR81 Split Pressurized Solar Hot Water System
Page 12 of 59
4. System description (Standard solar system with 1 tank, 1 collector field)
Description:
The controller calculates the temperature difference between collector sensor T1 and tank
sensor T2. If the difference is larger than or identical to the adjusted switch-on temperature
difference, the solar circulation pump (R1) will be switched on and the tank will be loaded
until the switch-off temperature difference or the maximum tank temperature is reached.
Sensor
ports
Description
Relay
outputs
Description
T1
Collector
temperature
sensor PT1000
R1
For solar circuit pump
T2
Temperature sensor on the
bottom
part
of
tank.
NTC10K
R2
1. for DHW circuit function
（
CIRC
）
2.OHDP
（
Thermal energy
transferring, R2,R3 can be
selected
）
T3
Temperature sensor on the
upper part of tank. NTC10K
T4
Temperature
sensor
on
DHW Pipe. NTC10K
R3
1.TIME
（
Timer function
）
2.AH
（
Automatic thermostat
function
3. OPAR ( Parallel relays
function)
T5
Temperature sensor
NTC10K ( function is not
defined)
T6
Temperature sensor for flow
pipe of DHW function
NTC10K
HR
For back-up heating
1.
Note:
Functions AH, TIME, OPAR all are designed to use output R3, when one of these
three functions (AH, TIME, OPAR) is activated, and then the other two will be
deactivated automatically.
