Oilon ESi 6-17, Installation And Operation Manual

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2.7.5 Load guard
When the heat pump has been set up for parallel use with an electric immersion
heater, the property’s distribution board needs to be equipped with priority relays.
The purpose of these relays is to step down the output of the heat pump’s electric
immersion heater when the alternating current drawn through the property’s main fuses
is close to the fuses’ rating.
1. Install priority relays downstream from the main fuse. The entire building’s mains
supply needs to be behind the relays.
2. Draw a 4-pole signal cable between the relays in the distribution board and the heat
pump’s control cabinet.
3. Adjust the relays’ settings, and connect the cables to the heat pump’s control
board.
The settings presented here are initial values, and may need
to be adjusted. Always adjust the relays based on the local
circumstances.
DIP switch positions
DIP switch Status Function
1 and 2
ON+OFF
ON+ON
OFF+ON
OFF+OFF
20 A
50 A
100 A
100 A
3
ON
OFF
N.D.
N.E.
4
ON
OFF
6 +/–1
1 +/–1
5
ON
OFF
Latch
Inhibit
6
ON
OFF
Over
Under
a. Select the current range.
● Switch 2 position = ON (when fuse rating < 50 A).
● Switch 1 and 3–6 position: OFF.
b. Adjust the hysteresis, output percentage, and delay from screws in front of the
relay (main fuses: 25 A).
● Hysteresis: 21
● Current: 25–28%
● Delay: 1 s
c. Connect an external supply to terminals A1 and A2.
The relay requires an external voltage of 24–240 V AC.
d. Connect output terminals 15 and 16 to the heat pump’s control board.
If a phase’s power draw exceeds its current limit, the phase’s output
terminal cuts off power to the immersion heater’s power stage that is
connected to that phase.
e. Each relay has an opening for a phase wire. Draw the phase wires through the
openings in the relays as follows:
● L1: relay 1
● L2: relay 2
● L3: relay 3
M8010 2204EN 23 (75)