Bradley Keltech HL Serie Manuel D'installation page 18

HL-Series Tankless Heater
Special Instructions and Operating Instructions
Tankless Water Heaters with Optional D1 or DC Controller Options
Pin-Out Diagram for Electrical Wiring
The controller is shipped with the D1 option deactivated. Contact the factory to get the unlock code
to activate the option.
DC Option Pin-Out
Pin Name
2 T+/R+
3 Signal Ground Signal Ground
4 T-/R-
1, 5, --
6-9
18
2 3 4
DC Option Pin-Out
Description
RS-485 Transmit/Receive
Non-Inverting Input/Output
RS-485 Transmit/Receive
Inverting Input/Output
No Connection
3/29/2018
D1 Option Pin-Out
Pin Name
3 Negative
4 +Current
7 Negative
8 +Current
1, 2, 5,
6, 9
Bradley • 215-1823 Rev. F; ECN 18-17-017
Installation
3 4
7
8
D1 Option Pin Out
Description
Return Current Path for
+Current, Pin 4
Supply 4-20mA Current to
Set Heater Temperature
Return Current Path for
+Current, Pin 8
Supply 4-20mA Current to
Monitor Heater Temperature
No Connection