Gree Versati III GRS-CQ4.0PdG/NhH2-E User Manual

Air-to-water Heat Pump All in One Versati
22
SPLIT TYPE
7.6 Water volume and expansion vessel pressure
Notes
(a) The expansion vessel is 10 liter and 1bar pre-pressurized;
(b) 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;
(c) Minimum total water volume is 20 liter;
(d) To adjust pre-pressure, use nitrogen gas by certicated installer.
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 di󰀨erence between installing location of indoor unit and the highest spot of
water system.)
Ensure that the volume of water system is lower than the maximum volume required in the above gure. If it
exceeds the range, the expansion vessel does not meet the installing requirement.
Installation height
di󰀨erence
Water volume
＜
280L
＞
280L
＜
7m 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 the above gure)
＞
7m
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 the above gure)
The expansion vessel is too small and
adjustment is not available.
Installation height di󰀨erence: the di󰀨erence 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 di󰀨erence is
considered 0m.
Example 1: The indoor unit is installed 5m below the outdoor unit and the total volume of the water system is
100L.Referring to the above gure, it is not necessary to adjust the pressure of the expansion vessel.

Gree Versati III GRS-CQ4.0PdG/NhH2-E Specifications

General

Brand	Gree
Model	Versati III GRS-CQ4.0PdG/NhH2-E
Category	Heat Pump
Language	English