Water Volume And Expansion Vessel Pressure; The Method Of Calculating The Charging Pressure Of Expansion Vessel - Gree Versati GRS-CQ4.0PdG/NhH-E Owner's Manual

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7.6 Water volume and expansion vessel pressure

Notes
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pressure should be adjusted to secure proper operation. If the indoor unit is located at the highest position,
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7.7 The method of calculating the charging pressure of expansion vessel

The method of calculating the charging pressure of expansion vessel needed to be adjusted is as follows.
During installation, if the volume of water system has changed, please check if the pre-set pressure of the
expansion vessel needs to be adjusted according to the following formula:
Pg=(H/10+0.3) Bar (H ---the difference between installing location of indoor unit and the highest spot of
water system.)
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exceeds the range, the expansion vessel does not meet the installing requirement.
Installation height
difference
7m
＞ 7m
Installation height difference: the difference between installing location of indoor unit and the highest spot of
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considered 0m.
Example 1: The indoor unit is installed 5m below the outdoor unit and the total volume of the water system is
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280L
Adjustment is not necessary
1. Pre-set pressure needs to be
adjusted according to the above
formula.
2. Check if the water volume is lower
than the maximum water volume. (with
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Water volume
＞ 280L
1. Pre-set pressure needs to be
adjusted according to the above
formula.
2. Check if the water volume is lower
than the maximum water volume. (with
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The expansion vessel is too small and
adjustment is not available.