Fronius Ohmpilot Operating Instructions Manual page 111

(1) INPUT - grid supply 1x 230 V network, spring-loaded terminal 1.5 - 2.5
2
mm
WARNING!
Short circuit
If current-carrying stripped wires touch each other, a short circuit is triggered.
▶
Carry out all connection work in accordance with the applicable electrotech-
nical guidelines and regulations.
▶
Observe the maximum stripping length of 10 mm.
▶
When connecting the phases, tie together the individual wires with a cable tie
directly in front of the terminal.
(2) Multifunctional relay output
OUTPUT up to 3 kW variable, max. 13 A resistive load, spring-loaded ter-
(3)
minal 1.5 - 2.5 mm
(4) Hot water boiler
Temperature sensor PT1000
(5)
(6) Circulating pump auxiliary relay
NOTE!
Relay contacts can oxidise.
The voltage must be at least 15 V and the current at least 2 mA, so that the relay
contacts do not oxidise.
(7) Heating element (max. 3 kW)
(8) Residual-current circuit breaker
(9) Automatic circuit breaker max. B16A
(10) Ferrite (included in scope of supply)
Via the floating contact of the device control, the Ohmpilot can also control a
circulating pump in a heating system in parallel to a heating element. This is pos-
sible with all circulating pumps that have an auxiliary relay.
The designation of the floating contact on the Ohmpilot is NC W NO. The swit-
ching rocker (W) switches from the "normally open" (NO) position to "normally
closed" (NC) when activated.
In heating mode, this contact is activated and the circulating pump runs as "Hea-
ter 2" in parallel to the heating element, which is operated via the "Heater 1" out-
put.
To prevent the auxiliary relay of the circulating pump from switching on and off
continuously in case of low or fluctuating PV power, the Ohmpilot is equipped
with a delay. This has a positive effect on the wear and service life of the relay
and the pump.
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