Key facts
- Brand
- Goldline
- Model
- GL-235
- Category
- Other
- Industry
- Appliances
- Documents
- 2
- Languages
- EN
- Last added
- 2026-10-03
Start here
Goldline Controls GL-235 Solar Pool Controller Installation and Operation Manual
The document provides installation instructions for the GL-235 differential temperature control used in solar heating systems for pools, spas, and hot tubs. It details requirements for mounting the unit outdoors at a minimum distance of 5 feet from the pool or spa, as well as specific wiring procedures for power input (115VAC or 240VAC) and low/high voltage outputs.
Read onlineGoldline GL-235 specifications
| Power input voltage | 105‑130 VAC, .5 A 50/60 Hz or 195‑250 VAC, .3 A 50/60 Hz |
|---|---|
| Selectable low‑voltage output | 24 VAC, 20 VA, .85 A or 12 VAC, 20 VA, 1.7 A |
| High‑voltage output rating | 115 VAC 1 HP or 240 VAC 2 HP |
| Sensors required | Two 10 kΩ thermistor sensors (10 kΩ @ 25 °C) |
| Differential temperature control | On at 4 °F, off at 1.5 °F |
| Desired pool temperature range | 70‑104 °F |
| Recirculate freeze protection activation | On below 40 °F, off above 42 °F |
Source: Goldline GL-235 Solar Pool Controller Installation & Operation Manual
All Goldline GL-235 documents by type
Mounting, wiring and first power-up. Read it before the hardware goes in.
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Questions answered in these manuals
How do I install the GL-235 controller?
Mount the box vertically with the knockouts facing downward, keep it at least 5 feet away from the pool or spa, turn off power at the circuit breaker, remove the internal panel, and follow the wiring diagram for power and sensor connections.
From: Goldline GL-235 Solar Pool Controller Installation & Operation Manual
How can I enable recirculate freeze protection?
Install the jumper across both pins marked “RECIRC” on the main circuit board and optionally wire GC‑3 freeze snap switches in series with the collector sensor.
From: Goldline GL-235 Solar Pool Controller Installation & Operation Manual
What is the minimum distance required between the controller and the pool?
The GL-235 must be mounted a minimum of 5 feet horizontally from the pool or spa.
From: Goldline Controls GL-235 Solar Pool Controller Installation and Operation Manual
How do I enable recirculate freeze protection?
Install the jumper across both pins marked 'RECIRC' located near the top right of the main circuit board.
From: Goldline Controls GL-235 Solar Pool Controller Installation and Operation Manual