Recommendation for refrigerator control

A. Use SYL-2342
The most commonly used controller for refrigerator or freezer is SYL-2342. This controller has a 10 amp relay output. Since most house hold freezer and refrigerator draw less than 7 Amp, they can be directly connected to the controller without using any external relay for the interface. The controller has two additional alarm outputs with 3 amp rating. User can use one of them to drive a 100-300 watts lamp for the heating.

Application example
Assume you want heater to turn on when temperature drops to below 60 F and turns off at 64 F. You also want to refrigerator to turn on when temperature is above 69 F and turn off at 65 F.
Set up for the controller
1) Wiring of the controller


2) Parameter setting
a.Hy = 2.0. Set both hysteresis bands for heater and cooler to 2 degree.
b.COOL=9. Set the controller to cooling mode, no alarm suppression, Fahrenheit temperature unit display.
c.AT=0. Set the controller main output to on/off control mode for refrigerator compressor control.
d.ALM2=62. Set the low limit alarm to 62 F. The heater (the bulb) will be on at 60 F (ALM2-Hy) and off at 64 F (ALM2+Hy).
e.SV=67. Refrigerator will be on at 69 F (SV+Hy) and off at 65 F (SV-Hy).
f.All of the rest of parameters of the controller should remain the same as the initial setting.
3) Product Links:
Controller:SYL-2342
Thermocouple:TC-K3MMorTC-K6A
Project Box (optional):CPTbox16

B. Use SYL-2362
1) Wiring of the controller


2) Parameter setting.
a. SV=65.
b. rd=1. Control Function: Cooling.
c. Outy=3. Relay J, J2 as alarm output; SSR On/off control output.
d.Hy=4. Fridge will be on at 69 F (SV+Hy) and off at 65 F (SV).
e.AH1=60, AL1=64. The heater (the bulb) will be on at 60 F and off at 64 F.
f.All of the rest of parameters of the controller should remain the same as the initial setting.
3. Product Links
Controller:SYL-2362
Thermocouple:TC-K3MMorTC-K6A
SSR:25A SSR
Project Box (optional):CPTbox16

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