46
Water connections
The total volume of water in the system must be less than that indicated, otherwise an additional expansion
tank will be required.
The additional expansion tank must be adjusted to the Pg pressure and must have a volume sized with the
formula:
VADD = 0.0693 x (VSYS / (2.5-Pg)) - VSTD [l]
VADD: additional expansion tank volume
VSYS: system water volume
VSTD: volume of the expansion tank supplied with the unit
Example 1:
Unit 8.1, installed 5m below the highest point of the water circuit → H = 5m
Total volume of water in the water circuit of 150l
respects the minimum water content (40l)
VEXP. VESSEL
SYST
Fig. 38
VADDITIONAL = VEXP. VESSEL - 4.8 [l] = 9-4.8 = 4.2l → additional 4.2l expansion tank required
Example 2:
Unit 10.1, installed at the highest point of the water circuit → H = 0m
Total volume of water in the water circuit of 250l
Pg = 0.3 + (0/10) = 0.3 bar
respects the minimum water content (60l)
H ≤ 7m - Water content > 230l → expansion tank should be adjusted to the Pg pressure
A2
A1
Fig. 39
Maximum water content: 310l → respects the maximum water content
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