Double Door Deep Freezer Wiring Diagram Explained | Complete Electrical Guide| by HELPER7.COM

Double door deep freezer wiring diagram with thermostat, door switch, cooling light, condenser fan, and compressor relay explained simply.

Double Door Deep Freezer Wiring Diagram – Complete Technician Guide

A double door deep freezer uses a simple but well-structured electrical system that controls cooling, lighting, and compressor operation. Understanding this wiring diagram helps technicians diagnose problems such as no cooling, fan not running, light failure, or compressor tripping on overload.

This article explains every component shown in the wiring diagram and how they work together in a 220–240V AC freezer.

---

1. Power Supply Section

The freezer operates on 220–240V AC, 50Hz.
The wiring uses three main lines:

• Red – Live (L)

• Blue – Neutral (N)

• Yellow/Green – Earth (Ground)

These wires distribute power to lights, switches, thermostat, and compressor system.

---

2. Door Lamp & Door Switch System

Each door has its own door switch connected to a door lamp.

• When the door opens → switch closes → light turns ON.

• When the door closes → switch opens → light turns OFF.

Red wire supplies power to the switches, while black wire returns power to the lamp.

This simple circuit ensures both compartments illuminate independently.

---

3. Cooling Light

The cooling chamber has a dedicated cooling light, also powered through a door switch.
This helps the user check products inside without opening the freezer fully.

The green wire is the main line used for cooling light and thermostat connection.

---

4. Thermostat Wiring

The thermostat controls the compressor operation.

• Red wire → thermostat input

• Green wire → thermostat output to compressor circuit

When internal temperature rises, the thermostat passes current to start the cooling cycle.
When set temperature is reached, the thermostat cuts the live supply.

---

5. Condenser Fan Motor

The condenser fan is connected using black wires.

This fan runs whenever the compressor is operating.
It removes heat from the condenser coil to maintain proper cooling efficiency.

---

6. Compressor Circuit

The compressor has three terminals:

• R – Run

• S – Start

• C – Common

The compressor is protected by an Overload Protector (O/L) placed between the common terminal and supply line.
This protects the compressor from high current and overheating.

---

7. Current Relay (Starting Relay)

The current relay wires:

• Terminal 12 → Start circuit

• Terminal 11 → Run circuit

• Terminal 13 → Coil connection

• Terminal 14 → Output to compressor

The relay helps the compressor start by connecting the start winding during initial current surge.
After the compressor starts, the relay automatically disconnects the start winding.

---

8. System Operation Summary

1. Power enters thermostat.

2. Thermostat sends power to compressor and fan when cooling is needed.

3. Relay starts the compressor.

4. OLP protects the compressor from overload.

5. Door switches independently control lights.

6. Condenser fan runs with compressor for heat removal.

This design keeps the deep freezer efficient, safe, and reliable.

---

Conclusion

This double door deep freezer wiring diagram is essential for technicians who repair or install refrigeration equipment. Understanding each wire color, switch, and relay connection makes troubleshooting fast and accurate. Use this guide while repairing, servicing, or installing similar freezers.

#DoubleDoorFreezer #DeepFreezerDiagram #FreezerWiring #RefrigerationElectrical #CoolingSystem #CompressorRelay #Thermostat #Helper7