SolarAttic FAQ – PCS3 Wiring Questions

If you're installing or troubleshooting a SolarAttic PCS3 solar pool heater, one of the most common areas of confusion is wiring. Whether you're connecting to an automation system, integrating with a controller like the GL-235, or adding optional components like float switches, understanding the correct wiring setup is critical for proper system operation.

This guide compiles and simplifies the most important PCS3 wiring FAQs, helping homeowners, installers, and technicians confidently wire and troubleshoot their system.

Understanding PCS3 Wiring Basics

The SolarAttic PCS3 is designed to integrate with standard solar pool control systems. Most commonly, it is wired to a controller such as the Goldline GL-235 or equivalent automation system.

At its core, the PCS3 wiring setup involves:

• Power supply to the blower motor

• Sensor wiring (attic temperature + pool water temperature)

• Control wiring to automation systems

• Optional safety devices (like float switches)

Proper wiring ensures that the system activates only when there is usable heat in the attic and shuts down safely when conditions are not ideal.

How Does PCS3 Connect to a Solar Controller?

The PCS3 is typically controlled by a solar controller that compares attic temperature to pool water temperature.

• When the attic is warmer than the pool water, the system turns ON

• When the attic is cooler, the system shuts OFF

The wiring must connect the PCS3 to the controller so it can respond to these signals.

📌 Important:

• The PCS3 must be wired correctly to allow the controller to regulate operation

• Incorrect wiring can cause the system to run continuously or not at all

According to SolarAttic documentation, reviewing the automation wiring diagrams is essential to ensure proper control functionality.

What Sensors Are Required?

The PCS3 system relies on two primary sensors:

1. Attic (Solar) Temperature Sensor

• Typically a 10K ohm thermistor

• Installed at the peak of the attic

• Measures available heat

2. Pool Water Temperature Sensor

• Installed in plumbing line

• Measures current pool temperature

These sensors are wired directly to the solar controller—not the PCS3 itself—but they determine when the PCS3 operates.

Optional Float Switch Wiring (Important Safety Feature)

One of the most important wiring-related features is the optional float switch, which protects your home from potential water issues.

How It Works:

• Installed inside the PCS3 base pan

• Detects water accumulation (condensation or leak)

• When triggered, it opens the sensor circuit

This causes the controller to interpret the attic as “cold,” automatically shutting down the system.

👉 In practical terms:

• System turns OFF immediately if water is detected

• Prevents damage to attic and equipment

Wiring Configuration:

• Float switch wires are connected in series with the attic sensor circuit

• Uses a normally closed switch

• Requires compatible 10K thermistor system

If triggered:

• The controller may show a “check sensor” warning

• System will not operate until the issue is resolved

This safety integration is a key part of PCS3 wiring design.

What Size Wire Should Be Used?

For proper installation:

• Recommended: 18/2 low-voltage wire

• Minimum: 22/2 wire

Using the correct wire size ensures:

• Reliable signal transmission

• Reduced interference

• Long-term durability

Can PCS3 Be Wired to Automation Systems?

Yes — the PCS3 is designed to work with automation systems.

Common integrations include:

• Solar controllers (GL-235 or similar)

• Pool automation systems

• Motorized valves and actuators

Key Considerations:

• PCS3 must operate in AUTO mode for full functionality

• Automation must correctly interpret sensor signals

• Wiring must match controller specifications

Improper automation wiring can result in:

• Incorrect temperature readings

• System short cycling

• Failure to activate

Common PCS3 Wiring Mistakes to Avoid

Here are the most frequent wiring issues seen in the field:

❌ Incorrect Sensor Placement

• Attic sensor not at peak → inaccurate readings

• Water sensor installed incorrectly

❌ Not Wiring Float Switch in Series

• Float protection won’t work

• Potential water damage risk

❌ Using Wrong Wire Type

• Signal loss or interference

• System instability

❌ Incorrect Controller Configuration

• PCS3 won’t turn on/off properly

• System runs inefficiently

Troubleshooting PCS3 Wiring Issues

If your system is not working properly, check the following:

System Not Turning On

• Verify attic temp is higher than pool temp

• Check sensor wiring connections

• Confirm controller is powered and configured

System Shuts Off Unexpectedly

• Inspect float switch (possible water detected)

• Check for loose sensor wiring

• Look for controller error messages

“Check Sensor” Error

• Often indicates:

  • Open circuit (float switch triggered)

  • Faulty or disconnected sensor

Pro Tips for Installers

• Always follow wiring diagrams from the manual

• Label all wires during installation

• Test system before finalizing installation

• Use weather-resistant wiring where applicable

• Keep wiring neat and organized for future service

Final Thoughts

Proper wiring is one of the most important aspects of a successful SolarAttic PCS3 installation. When installed correctly, the PCS3 system:

• Automatically captures attic heat

• Efficiently transfers it to your pool

• Operates safely with built-in protections

Taking the time to wire the system correctly ensures:

✔ Maximum performance✔ Long system life✔ Safe operation