solenoid valve cut-in duration > status transition delay (A3), the solenoid valve cuts off.
When the compressor stops operating, the solenoid valve cuts in. When the compressor
starts to operate (switched on), the solenoid valve must be in the cut-off status.
Water Temperature
In constant temperature control mode, the controller works as ordinary controller with water
temperature set-point at F0 constantly.
In intelligent temperature control mode, water temperature set-point changes as follows:
When room temperature + F1 < F9, water temperature set-point = F9;
When room temperature + F1 > F8, water temperature set-point = F8;
When room temperature + F1 ≤ F8 or ≥ F9, water temperature set-point = room
temperature + F1.
Alarm
1. Alarm Code
E1
E2
E3
E4
E5
High room te High water Low water tem Room temperatur Water temperatur
mperature
temperatur perature
e sensor failure e sensor failure
e
When an alarm occurs, all error codes and water temperature are displayed in turns.
2. Alarm Conditions
E1：Room temperature ﹥High air temperature alarm (F6 set-point) ；
E2 ： Water temperature ﹥Temperature set-point + Cooling differential (F2) + High
water temperature alarm (F4)
E3 ： Water temperature ﹤Temperature set-point - Heating differential (A0) - Low
temperature alarm (F5)
E4：Room temperature sensor is short-circuited or open-circuited (check if the sensor
loosens or replace the sensor)
E5：Water temperature sensor is short-circuited or open-circuited (check if the sensor
loosens or replace the sensor)
E2 and E3 alarm will be valid after power-on alarm delay (A1) elapses or water
temperature has entered the target temperature range (i.e., between the temperature
set-point and the temperature set-point + cooling differential F2).
3. Control Status in Alarm
When E1, E2, and E3 alarms are triggered, the cooling and heating relays operate according
to normal control requirements.
When E4 alarm is triggered, water temperature set-point (F0) equals to the factory default.
(In constant temperature control mode, E4 will not be triggered.)
When E5 alarm is triggered, the system should switch to cooling status regardless of the
status in which it operates.
4. Buzzer
Press any button to mute the buzzer, but alarm display remains until the alarm is canceled.
LED Indicator
The red LED (D1) above is always on, indicating that the controller is operating in the
