Gree VERSATI SERIES, Service Manual

Page: 76 / 158

73
Air to Water Heat Pump
Service Manual- Versati Series
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ĸ
If the noise of the pump is not acceptable, we recommended change the default speed to medium
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“EC”;
(2) Water Volume and Expansion Vessel Pressure
Note:
ķ Expansion vessel is included which 10 liter and 1bar pre-pressure.
ĸ Total water volume of 280 liter is default; If total water is changed because of installation condition, the
pre-pressure should be adjusted to secure proper operation. If the indoor unit is located at the highest position,
adjustment is not required;
Ĺ
Minimum total water volume is 20 liter;
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1.5 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:
P
g
=(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
1
Water volume
<280L >280L
<7 m 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 help of
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>7 m
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 help of
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The expansion vessel is too small and
adjustment is not available.
1
Note :
Installation height difference: the difference between installing location of indoor unit and the highest spot of
water system; if the indoor unit is located at the highest point of the installation, the installation height difference
is considered 0m.
The minimum volume of the water system is 20 L.
Example 1: The indoor unit is installed 5m below the outdoor unit and the total volume of the water system
is 100L.
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