Harken HYDRO 2 Power Unit - Manual (Page 12)

12 Hydro 2
Electrical Installation
Harken Hydro Units include 24 volt DC motors standard. 12 VDC motors are available by special order. If a 12VDC motor was specified
with system, refer to 12VDC motor electrical installation supplement for additional information.
Electrical installation is intended to be straight forward. For instance, connections internal to the ECB are prewired. At the time of installation
the user is only required to make the necessary connections between the switches, valves, ECB, HPU and power supply/battery.
To ease installation, the ECB terminals for switches, valves, 24V power and ground are labeled. For quick reference, terminal
and valve port labeling follows a corresponding numbering scheme. For the wires routing from switches on the deck or valves on the
manifold, waterproof integrity is maintained by passage through a sealed gland. Electrical installation is divided into five basic steps:
1. Connect the deck switches to the ECB
2. Connect a ECB to power supply
3. Connect HPU motor to the ECB
4. Connect valves to the ECB
5. Connect the HPU to the battery
IMPORTANT! Adhere to electrical standards per the National Boatbuilding Regulatory Bureau.
CAUTION! DO NOT connect the cable from the battery to the HPU until all of the other steps are complete.
CAUTION! Be extremely careful when connecting the battery cables. Short circuiting the battery connections can
damage the HPU and/or motor and possibly cause damage to the boat, a fire and/or personal injury.
CAUTION! Never run the HPU pump without oil. This can cause serious damage to the pump and/or motor and will void
the HPU warranty.
Wire Selection
Three types of wire cables are required for installation:
1. Wires to connect switches to the ECB.
2. Wires to connect the power supply to the ECB.
3. Wires to connect the HPU to the battery.
Minimize voltage loss on battery and power supply cables by sizing wire gauge for a length of wire. Refer to the Wire Sizing Table below
for a given length of wire.
At the HPU motor contactor, the positive terminal is an 8 mm stud, and the common ground terminal is a 10 mm stud. Install end
terminals using proper crimping tool.
16 ft (5 m) 33 ft (10 m) 49 ft (15 m)
Switch or Valve to ECB 16 AWG 1.31 mm 2 14 AWG 2.08 mm 2 12 AWG 3.31 mm 2
Power Supply to ECB 12 AWG 3.31 mm 2 10 AWG 5.26 mm 2 10 AWG 5.26 mm 2
Battery to HPU Motor 00 AWG 67.4 mm 2 0000 AWG 108 mm 2 — —
Wire Sizing Table