| Terminal | Function | |----------|----------| | 1 & 2 | Power input (110V/220V AC) | | 3 & 4 | Sensor probe (NTC 10K) | | 5 & 6 | Cooling relay (Normally Open) | | 7 & 8 | Heating relay (Normally Open) |
Even with a perfect , controllers drift over time. fourtech temperature controller manual