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Installation of accessories
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Compress 3400i AWS – 6721852066 (2023/01)
9.3 External inputs
Route all low voltage cables (measuring current) separately from cables
carrying 230 V or 400 V to avoid inductive interference (minimum
separation of 100 mm).
When extending temperature sensor cables, use the following conductor
diameters:
Cable up to 20 m in length: 0.75 to 1.50 mm2
Cable up to 30 m in length: 1.0 to 1.50 mm2
The relay output PK2 is active in cooling mode and can be used to control
the cooling/heating mode of a fan convector or a heating pump, or to
control underfloor heating circuits in humid rooms.
Maximum load at relay outputs: 2 A, cosϕ > 0.4. If the load is higher, it
will be necessary to use an intermediate relay.
WARNING
Material damage from incorrect connection!
The electrical components may become damaged if connected to the
wrong voltage or current.
Only make connections that are adapted for 5 V and 1 mA to the
external connections of the indoor unit.
If coupling relays are required, only use relays with gold contacts.
9.4 Installation of the domestic hot water cylinder
If the domestic hot water cylinder (DHW) is installed lower than the
outdoor unit (e.g. in the cellar), a natural circulation may occur that leads
to heat loss in the cylinder.
Install a non-return valve in the circuit to prevent natural circulation if
the installation height of the DHW cylinder is below the outdoor unit.
Fig. 19 Domestic hot water cylinder
[1] Non-return valve
Follow the mounting and connection instructions from the DHW cylinder
documentation.
The selection of the volume of the DHW cylinder depends on the type of
consumption, as showed in the following table:
CW1
TW1
1
DHW output for CS3400iAWS 4 OR-S1)
Time2) 5 minutes 10 minutes 20 minutes
Tap consumption (l/min)3) 5 10 15 5 10 15 5 10 15
1 shower
Total consumption volume (l)4) 25 50 75 50 100 150 100 200 300
Possible tank volume (l)5) 100 100 100 100 100 100 100 160 160
2 showers
Total consumption volume (l)4) 50 100 150 100 200 300 200 400 600
Possible tank volume (l)5) 100 100 120 100 160 200 160 300 500
4 showers
Total consumption volume (l)4) 100 200 300 200 400 600 400 800 1200
Possible tank volume (l)5) 100 160 200 160 300 500 300 600 1000
1) DHW set to 60 °C and inlet temperature 15 °C
2) Time per shower
3) Maximum tap flow
4) Maximum volume of water consumed during a shower for one time period and type of tap flow
5) Optimized cylinder volume to the domestic hot water consumption profile
23


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