Getting the Blue Point Temp 10 Up and Running
I've installed half a dozen of these across shop floors and small refrigeration setups. They're straightforward but have a few quirks that will trip you up if you're new to them. Let me walk through the basics and then cover what actually matters. You can grab the PDF from Blue Point's support page or third-party manual archives. But honestly, the manual glosses over some things that matter in practice. I'll cover those below. Wiring is simple enough. You've got line voltage going to the power terminals and a low-voltage output for the relay contactor or valve. The sensor type switches between thermistor and RTD depending on the model variant, so double-check which one you're working with before you start cutting wires. Getting this wrong means your temperature readings will be consistently off, and you won't notice until something freezes or overheats.
The display defaults to Celsius in most factory configurations. If you're running this in the US, you'll want to switch it immediately. Hold the mode button for about five seconds until the °F/°C indicator flashes, then press it again to toggle. That one isn't well documented in the manual. Setting the setpoint is the next step. Press the up or down arrow to reach your desired temperature. The unit has an adjustable hysteresis band, usually set to something like 2°F at the factory, which means the relay will kick on when the temperature drifts that far from your setpoint. For most refrigeration applications you want that tighter — maybe 1°F — but for general heating duty the default works fine.
Calibration and the Offset Trap
Here's where most people go wrong. The manual tells you about the calibration offset parameter, but doesn't really explain when you need it. I ran into this on a walk-in cooler install where the probe was reading about three degrees lower than a calibrated reference thermometer placed at the same location. The unit had been sitting in a warehouse for months before I got it, and somewhere along the way the sensor drift happened. My workaround: I accessed the calibration menu by holding the reset button while powering up the unit, which drops you into the service parameters. Then I adjusted the offset by the difference between the two readings. In my case that was +3 degrees. The manual doesn't tell you how to enter the service menu, so you learn that the hard way if you don't already know. This offset sticks even through power cycles. That's useful. It's also something I wish I'd known before going back and forth between the cooler and a temp gun for an hour trying to figure out why everything felt warm even though the display looked right.
Get the Full Details
Relay Behavior and Common Pitfalls
The Temp 10 uses a single relay output. That means it can either control cooling OR heating, not both simultaneously. If you're trying to build a unit that does both with one controller, you're going to need an external relay board or a different controller entirely. The manual mentions this in passing but doesn't lead with it, and I've seen a few people burn through trying to wire it around. Another thing the manual buries: the lockout timer. When the unit first powers on or recovers from a power loss, there's a built-in delay before the relay can engage. This is normally three minutes for compressor protection, but you can adjust it down to about thirty seconds in the service parameters. If you're controlling something non-compressor related like a heating element or fan, that three-minute delay is annoying. Drop it down. The sensor input has a known limitation with long wire runs. If your temperature probe is more than fifty feet away from the controller, you'll start seeing noise and instability in the readings. This isn't a bug — it's just how the input circuit works. For longer runs you want to use shielded cable and keep it away from any power wiring. I learned this when installing a Temp 10 in a meat locker where the probe had to run through the ceiling cavity alongside a 240V supply line. The temperature would jump around randomly until I pulled the sensor wiring into its own conduit.
When This Controller Falls Apart
Be honest about what this thing isn't. The Temp 10 is a basic single-stage controller. It doesn't do PID tuning. It doesn't communicate over any network. It doesn't have multiple setpoints or scheduling built in. If you need any of that, look elsewhere. There are controllers in the same price range that offer Modbus output, programmable ramps, and multi-stage compression control that would serve you better. The display is also backlight-free, which sounds minor until you're working in a dark freezer at 2 AM and can't read the screen without leaning directly against it. Not a dealbreaker but worth knowing. The interface itself is responsive enough for what it does, but navigating the menus takes some getting used to. You press mode to cycle through parameters, up and down to change values, and hold to confirm. It's functional but not intuitive. After a week it becomes second nature. Before that, expect to fumble through it once or twice.
Download the manual, read the wiring diagram section twice, check your sensor type before you install anything, and remember that the offset calibration is your friend when the readings don't match reality. That's pretty much all of it.
