Part 3 Determination of Water Temperature Set Value (Page 4 / 6) 5200 Chiller Temperature Controller RY1005A Manual

Part 3：Determination of Water Temperature Set Value:

When the temperature controller operates in constant temperature mode, similar to a regular temperature controller, the

water temperature set value remains constant as F0.

When the temperature controller operates in smart mode, the water temperature set value is variable. (As follows)

If the room temperature + F1 is less than F9, the water temperature set value is equal to F9.

If the room temperature + F1 is greater than F8, the water temperature set value is equal to F8.

If the room temperature + F1 is less than or equal to F8 and greater than or equal to F9, the water temperature set value

is equal to the room temperature + F1.

Part 4：Control in Abnormal States

1.Alarm Display

Code

Description High room High water Low water Room

Water

temperature temperature temperature temperature temperature flow

sensor

alarm

malfunction malfunction

When an alarm is triggered, all the error codes will be displayed in rotation with the water temperature.

2. Alarm Conditions:

Refer to the set code table.

E1: Room temperature > High room temperature alarm value (F6 setting).

E2: Water temperature > Set temperature + Cooling hysteresis (F2) + High water temperature alarm (F4).

E3: Water temperature < Set temperature - Heating hysteresis (A0) - Low water temperature alarm (F5).

E4: Room temperature sensor short circuit or open circuit (check if the sensor is loose or replace the sensor).

E5: Water temperature sensor short circuit or open circuit (check if the sensor is loose or replace the sensor).

Alarms E2 and E3 will be effective only after the power-on delay (A1) or when the water temperature enters the target

temperature range (between the set temperature and set temperature + cooling hysteresis F2).

3. Control Status during Alarms:

When E1, E2, or E3 alarms occur, both the cooling and heating relays will operate according to normal control

requirements.

When E4 alarm occurs, the water temperature set value (F0) will operate according to the factory default settings. (E4

alarm will not occur if the controller is operating in constant temperature mode.)

When E5 alarm occurs, the system should transition to a shutdown state regardless of the current operating mode.

4. Alarm Silencing: In the alarm state of the temperature controller, pressing any key will silence the alarm buzzer, but the

alarm display will continue until the alarm conditions are resolved.

5. External Input Alarm: When an external input alarm signal is received and meets the time set by A9, the system will be

controlled to stop or operate normally according to A12. The buzzer will sound. When the alarm is restored, it will return

to normal operation after a delay of A13 time, and the buzzer will stop sounding. The corresponding indicator light will not

illuminate.