How to Wire a Temperature Switch (Thermostat)?

Here's the professional English translation of the temperature switch wiring guide:

How to Wire a Temperature Switch (Thermostat)?

The wiring of a temperature switch (thermostat) depends on its type and function. Below are universal wiring methods and key considerations:

I. Power Supply Wiring?

Confirm Supply Voltage?

Most thermostats operate on ?220V AC?. Connect power wires to terminals marked "AC 220V," "Power," "L/N," or equivalent (typically terminals 8-9, 2-3, or L/N) 123??.

Wiring Standards?

Line (L) and Neutral (N) wires don’t require strict polarity but must be securely fastened ?.

For high-power devices (>1000W), use a ?contactor? for control—the thermostat only provides a control signal ??.

II. Output Control Wiring?

1. Relay Output Type?

Controlling Heating Devices?:

Connect ?Normally Open (NO) contacts? (e.g., terminals 7-8, 12-13) in series with the contactor coil circuit 3??.

Contacts ?close? to start heating when temperature falls below the setpoint; ?open? when temperature is reached 23.

Alarm Function?:

Alarm terminals (e.g., 10-11, 4-5) are typically ?NO contacts? that ?close? during overtemperature to activate alarms 3?.

2. Solid-State Relay (SSR) Control Type?

Output terminals? (e.g., 12-13) require polarity:

Terminal 12 → SSR positive (+)

Terminal 13 → SSR negative (–) 23.

The thermostat outputs a ?DC voltage signal? to drive the SSR 3.

For direct control of low-power devices, connect the output in series with the load and power supply ?.

III. Temperature Sensor Wiring?

Thermocouple/RTD Sensors?

Connect 2-wire sensors according to polarity to designated terminals (e.g., 9-10: Terminal 10 → red wire/positive; Terminal 9 → blue wire/negative) 12.

Terminals are labeled "Temp," "Sensor," or equivalent—ensure secure connections to avoid measurement errors 12.

IV. Wiring Precautions?

Power Off?: Always disconnect power before wiring ?.

Power Matching?:

Relay outputs typically support ≤10A load current. Exceeding this requires an external contactor ??.

SSR control must match the drive voltage 3.

Functional Verification?:

After power-up, set temperature values and test whether output contacts activate correctly during heating/cooling 12.

?? Critical Note?: Terminal definitions vary significantly by model. Always consult the device manual or on-body wiring diagram before proceeding 3??.

Key Terminology?:

常開觸點 (cháng kāi chù diǎn) → Normally Open (NO) contacts

接觸器 (jiēchù qì) → Contactor

固態(tài)繼電器 (gùtài jìdiànqì) → Solid State Relay (SSR)

復位 (fùwèi) → Reset

火線/零線 (huǒ xiàn/líng xiàn) → Line (L)/Neutral (N)