Refrigerant Pipe; Safety Considerations To Handle R32 Refrigerant; Systems; Pipework Connections - General - Bosch Compress 3400i AWS Installation Manual

Installation
5.2

Refrigerant pipe

5.2.1 Safety considerations to handle R32 refrigerant systems
CAUTION
Risk of frostbite and poisoning from refrigerant leaks!
Refrigerant can cause frostbite. If the refrigerant leaks, do not touch any
part of the outdoor unit.
▶ Avoid eye and skin exposure to the refrigerant.
▶ Ventilate the room immediately.
DANGER
Risk of malfunction, fire and explosion!
Malfunctions, fire and explosions may occur if the refrigerant system is
not properly operated during installation.
▶ Only authorized installer or service person are allowed to work on the
refrigerant system.
▶ Ignition sources of all kind must be kept away from the working area.
▶ Only use tools and pipe components specifically made for R32
refrigerant.
▶ Check for leaks in the refrigerant system with an appropriate
refrigerant detector.
NOTICE
Risk of environmental hazard!
▶ Never release refrigerant to the atmosphere.
WARNING
Risk of explosion
Abnormal substances in the refrigerant pipes might cause lower
capacity, high pressure in the refrigerant cycle, explosion and injury.
▶ Do not let other substances other than the specified refrigerant get
into the refrigeration system.
Ensure that all pipes and connections are protected against physical
damage. Mechanical connections to the indoor unit must be accessible
for maintenance purposes.
Pipe size (mm : inch)
(Diameter : Ø )
Unit Gas
CS3400iAWS 4 OR- 12.7 (1/2")
S
CS3400iAWS 6 OR- 15.88 (5/8")
S
CS3400iAWS 8 OR- 15.88 (5/8")
S
CS3400iAWS 10 15.88 (5/8")
OR-S
1) Check for the (1) marked in Fig. 11
2) Check for the (2) marked in Fig. 11
3) Oil traps are required every 3 meters
Table 6 Pipe length, elevation and refrigerant charge
12
1)
Single pipe length
Liquid Standard Max. (m) Standard
(m)
6.35 (1/4") 10 30
6.35 (1/4") 10 30
6.35 (1/4") 10 30
6.35 (1/4") 10 30
To minimize output losses and waste of energy:
▶ Reduce the pipe movements, avoid sharp angles and twists as much
as possible.
Use copper piping designed for refrigerant with a high-quality internal
finish and without oil residues.
Use tools and pipe components specifically indicated for the refrigerant
specified on the type plate.
5.2.2

Pipework connections - general

CAUTION
Risk of abnormal operation!
Pipe length between indoor and outdoor unit influences the operation of
the appliance by reducing the thermal capacity and the efficiency of the
unit.
▶ Keep pipe length to a minimum (≥ 3m).
▶ Do not exceed the maximum pipe length.
▶ Charge the refrigerant properly and notice the maximum allowed
charge which must never be exceeded.
▶ If the pipe length is longer than 10m, add additional charge of the
refrigerant according to the following table.
The single pipe length without necessary additional filling is 10m.
Additional filling of refrigerant is not required up to this length.
To calculate the amount of additional refrigerant charge needed when
the pipe length is more than 10m, observe this example: if the split unit
with a single pipe length of 30m is installed, fill with an additional 400g
refrigerant. The following applies: (single pipe length - standard single
pipe length) x additional refrigerant change = (30-10) x 20g = 400g
2)
Pipe elevation Refrigerant
Max.
3)
(m) (m)
0 15 R32
0 15 R32
0 15 R32
0 15 R32
Compress 3400i AWS – 6721825369 (2021/11)
Standard *Additional Maximum
charge charge (kg)
Refrigerant
(g/m)
single pipe
length
1.10 20
1.30 20
1.30 20
1.30 20
1.50
1.70
1.70
1.70