Bosch Compress 7001i AW, Руководство по установке

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Regulations
Compress 7001i AW – 6721835318 (2021/09) 4
2.1 Water quality
Water quality in the heating system
Heat pumps operate at lower temperatures than other heating systems
which means that the thermal de-airing is not as effective and oxygen
levels are never as low as with a system incorporating an electric/oil/ gas
boiler. This means that the heating system will be more susceptible to
corrosion when exposed to aggressive water.
Preventive actions are required if the heating systems require recurrent
filling or where a heating water sample does not show clear water.
Preventive actions can be to supplement the heating system with a
magnetite filter and a de-airing valve.
Actions when the heating system requires recurrent filling:
▶ Check that the volume of the expansion vessel is sufficient for the
heating system volume.
▶ Replace the expansion vessel.
▶ Check the heating system for leakages.
A system separation with the help of a heat exchanger may be required if
the limits in table 2 can not be achieved.
The limits stated in table 2 are required to ensure the output data and
operation of the heat pump throughout its entire life span.
Table 2 Water quality
Additional water treatment to prevent lime-scale deposits
Poor quality of the heating water promotes the formation of sludge and
lime-scale. This can lead to malfunctions and damage of the heat
exchanger in the heat pump. According to the current guideline VDI
2035 “Avoidance of Damage in hot water heating systems” and
depending on the degree of hardness of the filling water, the system
volume and the total output of the system, water treatment may be
required to avoid damage due to the formation of lime-scale.
NOTICE
Risk of damage to system or appliance!
Debris from the system can damage the appliance and reduce efficiency.
▶ Follow the guidance of BS7593 for treatment of water in domestic
hot water heating systems
1)
.
▶ Do not use anti-freeze/glycol products.
Suitable water treatment products (inhibitors/cleaners) can be
obtained from the following manufacturers:
Table 3
If the limits for water hardness stated in table 2 are exceeded, the
performance of the heat pump will deteriorate over time. If this
performance degradation can be accepted, the limits in figure 1 are
required to ensure the operation of the heat pump throughout its entire
life span.
Table 4 Table for heat pumps
Fig. 1 Limits for water treatment in heat pump systems
A Use completely de-mineralized fill water above the curve,
conductivity ≤ 10 microsiemens /cm.
B Use untreated tap water below the curve. Fill according to the
drinking water regulation.
H
w
Water hardness.
V Total water volume: Fill volume of the heating system and top-up
volume over the life span of the heat pump.
If the total water volume is above the limit curve in the diagram (

Fig. 1)
suitable measures are required for water treatment.
Suitable measures are:
• Use of fully de-mineralized fill water with a Conductivity of ≤ 10
microsiemens / cm.
To prevent oxygen from entering the heating water, the expansion vessel
must be adequately dimensioned.
When installing diffusion open pipes, a system separation with the help
of a heat exchanger is required.
Water quality
Hardness <3 °dH
Oxygen content <1 mg/l
Carbon dioxide, CO
2
<1 mg/l
Chloride ions, CL
-
<250 mg/l
Sulphate, SO
4
<100 mg/l
Conductivity <350 μS/cm
pH 7,5 – 9
1) Only applicable in the United Kingdom.
ADEY 01242 546700
www.adey.com
FERNOX 0330 100 7750
www.fernox.com
SENTINEL 01928 704330
www.sentinelprotects.com/uk
Heat pump
output [kW] Total alkalinity
/ total hardness
of the filling
water [°dh]
Maximum fill and top-up water
volume V
max
[m
3
]
Q < 50 Requirements
according to
figure 1
Requirements according to
figure 1
0,00
0,20
0,40
0,60
0,80
1,00
1,20
1,40
1,60
1,80
2,00
2,20
2,40
2,60
0 5 10 15
0010036248-002
V [m 3 ]
H
W
[°dH]
A
B