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Technical information
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Compress 3400i AWS – 6721852066 (2023/01)
Table 10 Indoor unit with integrated electric booster heater
11.2 Primary circulation pump diagram (PC0)
Primary circulation pump diagram (PC0) for the heating system
CS3400iAWS 10 E.
Fig. 27 Capacity curve of the primary circulation pump (PC0)
11.3 System solutions
The outdoor unit and the indoor unit may only be installed according to
the manufacturer's official system solutions.
Deviating system solutions are impermissible. Warranty may be voided
in the case of damage and problems resulting from impermissible
installation.
The indoor unit is prepared to work without bypass/buffer, if the volume
and minimum flow declared in chapter 4.2 are permanently met and if
the pressure drop in the circuit is below the pressure available from the
primary circulation pump (PC0) as stated in table 10.
If the appliance is directly connected to the heating circuit (without
bypass or buffer tank) and consequently no heating circulation pump
(PC1) is installed, the primary circulation pump (PC0) must be set to
continuous operation mode. Use the control unit to select: Service menu
> Heat pump > Pumps > Prim. heating pump mode > On.
Some system configurations require accessories (buffer cylinder, 3-way
valve, mixing valve, DHW circulation pump). If a heating circulation pump
(PC1) is installed, this is controlled by the controller in the indoor unit.
The following table shows different system solutions:
Minimum flow (during defrosting)4) l/min 15
Minimum/maximum water operating temperature
(cooling5)/heating mode)
°C 7/80
Pump type Grundfos UPM2K 25-75 PWM (EEI≤0,23)6)
General Information
Installation altitude up to 2000m above sea level
IP rating IPX1
Dimensions (width x depth x height) mm 485 x 398 x 700
Weight kg 41
1) 400V 3N ~ AC 50 Hz. The outdoor unit must have a separate power supply.
2) For 230V ~1N AC 50 Hz. The outdoor unit must have a separate power supply.
3) Fuse characteristic gL/C.
4) If the minimum flow rate in the system cannot be ensured, a buffer cylinder is essential.
5) If cooling is available.
6) The benchmark for the most efficient circulators is EEI ≤ 0,20.
CS3400iAWS 10 E Unit CS3400iAWS 4
OR-S
CS3400iAWS 6
OR-S
CS3400iAWS 8
OR-S
CS3400iAWS 10
OR-S
0
1
2
3
4
5
6
7
8
0.0 0.5 1.0 1.5 2.0 2.5 3.0
H [m]
Q [m³/h]
0010039797-001
Heat distribution
system
Type of valves in
system
Outdoor unit Open system size (l) Electric booster
heater On/Off
System solution
UF heating/ Fan coils No auto control valves
or on/off valves with
open circuits
CS3400iAWS 4 OR-S <13 - Buffer1)
13<35 Electric booster heater
on
Direct system2) or
bypass
Electric booster heater
off
Buffer1)
>35 - Direct system2) or
bypass
On/off valves with no
open circuits
--Buffer
1)
No open circuits and
differential pressure
- - Serial buffer1)
27


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