Thermostat NA1540 Refrigeration Controller Power Supply:9~12 V AC Can be set as "controlled mode"and "free mode"

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Basic Info.
  • Brand Name: NEWASIA 
  • Hole Size(mm): 71*29 
  • Model No.: NA1540 
  • Place of Origin: Jiangsu  
  • Min.Order: 10 Set/Sets
  • Means of Transport: Ocean, Air, Land
Supply Capacity
  • Production Capacity: 3000sets/day
  • Packing:Each set per polybag, then in white box.
  • Delivery Date: 15days
Main Functions:
Temperature control :the temperature display, temperature control, compressor start delay protection,
temperature sensor error alarm.
Fan Controlling: fan delay boot(double controlled by temperature and time), delay shut down of fan. It can be set as "controlled mode" and "free mode".
Defrosting Controlling: Timing to start defrosting, the condition of defrosting finished is double controlled by temperature and time, defrosting and dripping, manual defrosting.
Main Technique Index:
Temperature Display Range:-50°C~125°C
Temperature Setting Range:-45°C~120°C,adjustable
Defrosting cycle: 0~99 hours, adjustable
Power Supply:9~12 V AC   we provide transformer,primary voltage 220V±10% or 380V±10%)
Operation Environment: temperature -10°C~50°C, humidity≤85%.Without congealed hoarfrost, no corrosion.
Relay contact capability: 2A/250VAC
Temperature sensor: NTC R25=5kΩ, B (25/50) =3470K
Executive standard: Q/320585 XYK 01
Operating Guide
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“6”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 “upper limit temperature” is higher for 0.5°C than “lower limit temperature”.
How to set the defrosting cycle?
Press the key of select to show the “defrosting cycle”, then use the key of “∧”or“∨” to change the set value(The key of “∧” adds 1hour, and the key of “∨”minuses 1hour, press the keys and hold them over 0.5 seconds can increase and decrease rapidly).The set range of defrosting cycle is 0~99hours,if set to 0 means not defrosting.
After the upper limit and lower limit of temperature and defrosting cycle has been set, The value can be only saved after exiting the state of setting. The value which has been set can not be saved if the power is off before exiting the state of setting.
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.
How to defrost manually?
Press the key of manual defrosting and hold it for 1 second, and then enter the state of defrosting. It will do nothing if you press the key of manual defrosting and leave it at once .The state of defrosting can be ended forcibly when you press the key of manual and hold it for 1 second again.
How to read the temperature of the temperature prober?
Press the key of down when it shows the current temperature, and it can show the temperature of the defrosting temperature prober .It will show the current temperature when release the key of down.
How to eliminate the sound of alarm?
Press any key when there is a sound of alarm.
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 the statement happens, 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.
Advanced Operation
The controller can adjust some internal parameter to meet all kinds of need. These parameters are supplied for special technologist, and common users don't need to know. Please don’t change the internal parameter of the controller casually, lest lead to the 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”,thereinto xx is a number,it means parameter code.
Use the key of 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 of up or down again to set the parameter, then press the key of select 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:
Parameter Name
Factory Setting
Temperature controlling
Temperature revision
-5 -- +5
Revise temperature bias
Compressor halt protection time
0 -- 10
Compressor running frequency *
0 -- 10
Refer to the annotation 1
Defrosting cycle
0 -- 99
0 means no defrosting
Defrosting stop temperature
5 -- 50
Time of defrosting
1 -- 99
Dripping time
0 – 99
Temperature of fan boots
-45 -- 45
Fan start delay
0 -- 240
Fan stop delay
0 -- 240
External alarm lock time*
0 -- 240
Refer to the annotation 2
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 lets 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.

Operating Principle
1.Temperature Controlling
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.
2.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.)
3.Auto Defrosting
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).
4.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.
5.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.

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Suzhou Newasia Technologies Inc
China (Mainland)
Fax: 86-0512-53107055
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