NA1551 Water-Cooling Unit Controller User’s Guide
Temperature Display Temperature Controlling(Refrigeration)
Fan Controlling Fan Delay Start Fan Delay Shutoff
Water pump controlling Water pressure checking Water lack alarm
Intelligent Defrosting controlling manual defrosting Dripping
Compressor Start Delay Protection Temperature Prober Error Alarm
Outdoor Alarm(high voltage, low voltage, over loading) Alarm Signal Output
Main Technique Index:
O Temperature Display Range: -50~125°C(Step 0.1°C)
O Temperature Setting Range: -45~120°C, adjustable
O Power Supply:9~12V AC
O Output Capacity: 2A/380V
O Drilling Size(mm):106.3x165 (Height*Width)
G How to set the upper limit and lower limit of temperature?
Press the key of select to show the upper limit and lower limit of temperature, then use the key of “∧”or“∨” to change the set value.(The key of “∧”adds 0.1°C, and the key of“∨”minuses 0.1°C, press the keys and hold them over 0.5 seconds can increase and decrease rapidly). Notice that the controller can automatically ensure the "upper limit temperature” is 0.5°C higher than the “lower limit temperature”.
G How to set the defrosting cycle?
Press the select key to show the “defrosting cycle”, then use the key “∧”or“∨” to change the set value(The key "∧” adds 1 hour, and the key “∨”minuses 1 hour, press the key and hold it for more than 0.5 second to increase and decrease rapidly).The set range of defrosting cycle is 0~99 hours,if the set value is 0 means not defrosting.
Notice:After setting the upper limit and lower limit temperature and defrosting cycle, the value cannot be saved until return to the state of setting. The set value also can not be saved if the power is off before returning to the state of setting.
G How to shut off the function of auto defrosting?
If you don’t need the function of defrosting, you can set it to 0, here the prober can be used in other ways, for example, it can be used to detect the environment temperature around.
G How to defrost manually?
Press the key of manual defrosting and hold it for 1 second, then enter the state of defrosting. It will not take effect if you press the key of manual defrosting and leave it at once .When to stop defrosting, press the manual key and hold it for 1 second.
G How to read the temperature of the temperature prober?
Press the key “∨” when it shows the current temperature,then it can show the temperature of the defrosting temperature prober .It return to the current temperature when release the key “∨”.
G How to eliminate the sound of alarm?
Press any key when there is a sound of alarm.
G How to deal with alarm?
The controller will lock the state of alarm during some time when the external alarm occurs, the light of alarm is flashing, if ithappens, you must first find the cause of troubles according to the light of alarm (high pressure, low pressure or overload), then you can press the key of resume to relieve the state of alarm after eliminating the troubles.
The controller can adjust some internal parameter to meet all kinds of need. These parameters are supplied for special technologist, common users don’t need to know. Please don’t change the internal parameter of the controller casually, lest lead to abnormity of the controller. The way to set the internal parameter is as below:
Use the code to enter the state of parameter setting, the code is “up-down-up-down-up-up-down”, press the key of up or down continuously in the state of showing current temperature, and it must be finished within 3 seconds,if the code is right, you can enter the state of parameter setting, here the nixietube shows “Fxx”, xx here is double-digit number,it means parameter code.
Use the key up or down to select the parameter code, press the key of select to show the value of the parameter after you have selected one parameter, here you can use the key up or down again to set the parameter, then press the select key again to return the state of showing parameter code after finishing setting.(The parameter which has been changed can be only saved after returning to the state of “Fxx” by pressing the key of "select”)
Internal parameter code is as follows:
-5 -- +5
Revise temperature bias
Compressor halt protection time
0 -- 10
Compressor running frequency *
0 -- 10
see annotation 1
0 -- 99
0 means no defrosting
Defrosting stop temperature
5 -- 50
Time of defrosting
1 -- 99
0 – 99
Temperature of fan boots
-45 -- 45
Fan start delay
0 -- 240
Fan stop delay
0 -- 240
External alarm lock time*
0 -- 240
see annotation 2
Water lack alarm resuming time*
0 -- 240
see annotation 3
This function can attract all relays in turn, please don’t use it when the controller is running!
1. “Compressor running frequency” is used when temperature sensor is error. This function makes compressor run in the state of protecting. In this state, the cycle is 30 minutes, then compressor runs for F22*3 minutes, and stops for 30-(F22*3) minutes. For example, if the parameter of F22 is set to 3, then the compressor runs for 9 minutes, and stops for 21 minutes, and all that. If you don’t need this function, F22 can be set to 0.
2. “External alarm lock time” means that when outdoor alarm occurred, even if the outdoor alarm is removed, the controller will keep the state of alarm for a few time. Press the key “resume” can cleanup alarm forcibly.
3. “Water lack alarm resuming time” means that the controller will give a water lack alarm and turn off the compressor and the water pump when the water pressure is abnormal. But after the water pump has been turned off, the water pressure can not be checked and the controller can not know when the water supply will resume. The purpose of the parameter is to repeal the water lack alarm automatically after some time, and make the water pump starts up again. Pressing the “resume” key can clear the water lack alarm immediately.
Temperature controlling is based on “Upper limit temperature” and “Lower limit temperature” .If “Upper limit temperature” is 20°C, “Lower limit temperature” is 18°C, when temperature prober (refrigerator sensor) apperceives that the temperature is higher than 20°C, compressor turns on, then if the temperature is lower than 18°C, compressor stops. Thus temperature can be controlled between 18°C and 20°C.
Compressor delay time
The controller contains a “compress halt calculagraph”,it begins to time when compressor stops, the program first check the calculagraph before booting the compressor next time, the program will immediately boot the compressor if the calculagraph reach 3 minutes ,if the calculagraph doesn’t reach 3 minutes ,it will boot later when the calculagraph reaches 3 minutes. In addition, the controller doesn’t turn on the compressor within 3 minutes after the power supply is on.(The introduction above is based on that the ”boot delay protection of compressor” is 3 minutes, this parameter can be set, if you don’t need delay, it can be set to 0.)
The controller starts defrosting according to “defrosting cycle”. After defrosted, the controller can check the defrosting effect by defrosting temperature prober. If the temperature reaches the “Defrosting end temperature”, defrosting will stop. If the time is longer than “defrosting time”, Micro-controller will finish defrosting, and open the alarm of defrosting failure (the light of defrosting cycle is flashing).
Defrosting and dripping
Set a time of dripping, for example, 5 minutes, thus the compressor doesn’t start to refrigerate again for 5 minutes after finishing defrosting, here the indicator light of defrosting will flash. Yet controller can not enter the state of dripping in two conditions: one is that finishing the defrosting.
manually, the other is the error of defrosting sensor.
About Fan Controlling
Fan doesn’t start immediately after cooling, controller can detect the evaporator temperature by defrosting temperature prober, fan will boot when evaporator temperature is lower than “Fan startup temperature”. If the evaporator temperature doesn’t lower for a long time after cooling, and over the time of “Fan startup delay”, fan will run compulsively. If you want to start up the fan immediately, set the time of “Fan startup delay” to become 0. Fan also doesn’t stop immediately after stopping refrigeration, it will delay for some time, the time can be set in the parameter of “Fan stop delay”, if you don’t need the function of delay, set the parameter to become 0.
Water pump controlling
The controller will turn on the water pump and check the water pressure signal when it starts up. The compressor will not be turned on until the water pressure is normal (Water pressure switch close).If the water pressure is abnormal after the water pump starts up for 1 minute, or the water pressure signal is being interrupted for above 5 seconds, the controller gives a water lack alarm and turns off the water pump and the compressor. The water lack alarm can be repealed after some time, and the time can be set (Please refer to the senior operation).
1. Please place the temperature prober to air return of the air cooler, the prober of defrosting must be fixed on the muffler of the air cooler.
2. The earth terminal of the controller should be connected with the earth terminal of the electric cabinet reliably,be sure to connect the earth well.
3. Please use power supply transformer and temperature sensors with the controller which is supplied by our company. Manually, the other is the error of defrosting sensor.