Bypass Of The Heating System - Bosch Compress 3400i AWS Installation Manual
Indoor unit for air to water heat pump
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11.3.2 Bypass of the heating system
If the heating system is not able to permanently meet the minimum
volume and flow and if the pressure loss in the circuit is more than
allowed, a bypass should be installed according to the instructions.
PC1
1
2
3
Fig. 28 Indoor unit with heating circuit and bypass
[1]
Bypass
[2]
Flow pipe diameter
[3]
Return pipe diameter
1
2
3
Fig. 29 Indoor unit with heating circuit and DHW heating
[1]
Bypass
[2]
Flow pipe diameter
[3]
Return pipe diameter
Compress 3400i AWS – 6721852066 (2023/01)
T
T
0010036801-001
PC1
PC0
SC1
0010036802-001
Fig. 30 Bypass details (
[1] [CS3400iAWS 10 E fig. 28 and 29)
[L]
Minimum bypass length
[D]
Pipe diameter
The bypass must have an outer pipe diameter of 22 mm (Cu) and be
installed between the supply and return. The bypass must be installed
close to the indoor unit (CS3400iAWS 10 E), and no more than 1.5 m
away from it.
([1] fig.
([2] and [3]
fig. 28
28 and 29)
[CS3400iAW
external
Outdoor
S 10 E] and
bypass pipe
unit
29) external
diameter ([D]
fig. 30)
flow/return
pipe diameter
mm
mm
CS3400iA
22
22
WS 4-10
OR-S
Table 12 Pipe diameter and bypass lengths
Fig. 31 Bypass
[A]
Bypass, straight design
[B]
Bypass, U-shaped design
Technical information
Bypass design
([A] fig.
([B] fig.
31)
31)
Minimum
Minimum
bypass
bypass
length ([L]
length ([L]
fig. 30)
fig. 30)
mm
mm
200
100
29
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