Instruction of SR91 Split Pressurized Solar Hot Water System
Page 10 of 49
3.3.2 Terminal allocation of controller for electrical heater of 3000W/4000W
Input ports
T1: PT1000 temperature sensor, for measuring the temperature of collector
T2 ~T5: NTC10K, B=3950 temperature sensor, for measuring temperature of tank and
pipe.
FRT: For rotary vane type electronic flowmeter
3000W/4000W Output ports
Input Ports L, N: for power connection, L: live wire, N: zero wire, protective wire, it
is better to use 2.5mm2 cable.
Output R1: Electromagnetic relays, for control pump or valve, Max. Current: 2A
Output R2: Electromagnetic relays, for control pump or valve, Max. Current: 2A
Output R3: Electromagnetic relays, for control pump or valve, Max. Current: 2A
3000W Output HR: Electromagnetic relays, designed for on/off control of back-up
heating device, Max. Current: 15A ( @AC230V, for
3000W electrical heater,
@110VAC, for
1500W electrical heater)
4000W Output HR: Electromagnetic relays, designed for on/off control of back-up
heating device, Max. Current: 20A ( @AC230V, for
4000W electrical heater,
@110VAC, for
2000W electrical heater)
Advice regarding the installation of temperature sensors:
Only original factory equipped Pt1000 temperature sensors are approved for using with
the controller, it is equipped with 1.5m silicon cable and suitable for all weather
conditions, the cable is temperature resistant up to 280
o
C, connect the temperature
sensors to the corresponding terminals with either polarity.
Only original factory equipped NTC10K,B=3950 temperature sensors are approved for
using with tank and pipe, it is equipped with 3m PVC cable, and the cable is
temperature resistant up to 105
o
C, connect the temperature sensors to the
