Ok, I'm going to assume you want to use this 2-stage controller to simultaneously manage a chiller and a heater.
Refer to Figure 3. This is the mode you're going to set up. You should draw up a similar figure and annotate it with your target chamber temperature, the differentials for both Cooling (Stage 1) and Heating (Stage 2) modes, and some small range for the Deadband (between the two stages).
For this exercise, we'll aim for 38°F, with 2 degrees of differential for both stages, and 2 degrees of Deadband. The chiller will turn on at 40°F and cool back down to 38°F where it will turn off. If the chamber goes below 34°F, the heater will warm it back up to 36°F. That leaves the 2° of deadband between the two modes.
So, plug the controller in, and follow the 7 steps shown on page 3. Note that Steps 2-4 set up Stage 1 and Steps 5-7 set up Stage 2.
1. Press the SET key to choose between F and C. Press the up or down arrow key to select the Fahrenheit scale.
2. Press the SET key. The LCD will show the current Stage 1 setpoint. Use the up and down arrows to select 38°F.
3. Press the SET key. The LCD will show the current Stage 1 differential. Use the up and down arrows to select 2°.
4. Press the SET key. The LCD will show the current Stage 1 mode. C1 is cooling, H1 is heating. You want C1, so use the up and down arrows to get that to appear.
5. Press the SET key. The LCD will show the current Stage 2 setpoint. Use the up and down arrows to select 34°F.
6. Press the SET key. The LCD will show the current Stage 2 differential. Use the up and down arrows to select 2°.
7. Press the SET key. The LCD will show the current Stage 2 mode. You want H2, so use the up and down arrows to get that to appear.
8. Press the SET key to activate the program. (<= the instructions have you do this at the end of Step 7. I put it here instead for clarity).
Cheers!