Takagi 110U Indoor (T-KJr2U-IN) Installation Manual And Owner's Manual page 23

3. "Fork terminals" "Remote controller terminal"
(Fig. C-1)
4. (Fig. C-2)
5. Main body "Back plate" "Remote controller cable"
Fig. C-1
Fig. C-2
<How to connect the remote controller to the water heater>
1.
2.
110U (T-KJr2U) and 310U (T-K4U) models
3.
9008172005
(TM-RE40)
4.
Connect other end to these terminals Front of remote