Why Am I Getting Hot Water First Out Of A Rite-Temp Bath/Shower Valve?
The valve may be installed upside down; therefore the mixer cap assembly is mixing water "backwards."
While observing the cap assembly, find the red/black collar and tab. This red tab needs to touching the stationary black tab on the cap and in the up position, pointed upwards towards 12:00. In the picture below, the red tab is facing downward, and in the 5:00 position.
To correct the problem:
1. Turn off the water supply.
2. Remove the screws on the left & right side of cap, and the remove the collar.
3. Pull out and rotate the cap until the stationary tab and collar are in the upward position.