Gree Versati II Series User manual

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GREE ELECTRIC APPLIANCES, INC.OF ZHUHAI
Air-to-water Heat Pump Monobloc Versati
Design and Selection

CONTENTS
1 Installation Example ������������������������������������������������������������������������������� 1
2 Model Selection �������������������������������������������������������������������������������������� 3
2.1 Speculations of Power Supply ................................................................................... 3
2.2 Operation Conditions ................................................................................................. 3
2.3 Flowchart of Model Selection ..................................................................................... 3
2.4 Design Principle ......................................................................................................... 3
3 Selection of the Underoor Coils���������������������������������������������������������� 4
3.1 Calculation of Unit Load for Floor Heating ................................................................. 4
3.2 Selection of Tube Spacing of the Underoor Coils..................................................... 4
4 Quantity and Location of the Water Traps and Collectors������������������ 5
4.1 Design Requirements on Loop Quantity for Circulation Water................................... 5
4.2 Requirements on Installation of the Water Trap (Collector) ....................................... 6
5 Section of FCU ���������������������������������������������������������������������������������������� 7
5.1 FCU Type Selection ................................................................................................... 7
5.2 Matching of Capacity.................................................................................................. 7
6 Selection of the Water Tank ������������������������������������������������������������������� 8
6.1 Specications of the Water Tank ................................................................................ 8
6.2 Volume Selection of the Water Tank .......................................................................... 8
7 Examples for Model Selection��������������������������������������������������������������� 8
7.1 General Introduction to the Example Project ............................................................ 8
7.2 Heat Load Calculation................................................................................................ 9
7.3 Model Selection........................................................................................................ 10

1
Design & Selection
1 Installation Example
CASE 1: Connecting Heat Emitters for Heating and Cooling(Under floor loop,Fan Coil Unit,and
Radiator)
Notes
①The two-way valve is very important to prevent dew condensation on the oor and Radiator while cooling
mode;
②Type of thermostat and specication should be complied with installation of this manual;
③The Bypass valve must be installed to secure enough water ow rate, and should be installed at the
collector.
CASE 2: Connecting Sanitary Water Tank
Notes
①In this case, three-way valve should be installed and should be complied with installation of this manual;
②Sanitary water tank should be equipped with internal electric heater to secure enough heat energy in the
very cold days;

2
Design & Selection
CASE 3 : Connecting Solar thermal system
Two-way valve is very important to prevent dew condensation on the oor and Radiator while cooling mode.
CASE 4 : Connecting Swimming pool system
B
M
T
3-way valve 1
3-way valve 2
City water
Radiator
FCU 1F CU 2
Under Floor Coil
Booster heater
Sanitary water tank
Hot water
Notes:
①Two-way valve is very important to prevent dew condensation on the oor and Radiator while cooling
mode.
②3-Way valve 1 is controlled by user,while the pool pump is actived, 3-Way valve 1 switches to
③pool loop;while the pool pump is shuted down,3-Way valve 1 switches to under oor/FCU loop.
④3-Way valve 2 is automatic controlled by monobloc unit,while running water heating mode,3-Way valve
2 switches to water tank loop;while running cooling/heating mode,3-Way valve 2 switches to under oor/FCU
loop.

3
Design & Selection
2 Model Selection
2.1 Speculations of Power Supply
Two choices of Power Supply
380~415V-3PH-50Hz
220~240V-1PH-50Hz
GRS-CQ10Pd/NaC-K
GRS-CQ8.0Pd/NaC-K
GRS-CQ12Pd/NaC-M
GRS-CQ14Pd/NaC-M
2.2 Operation Conditions
Capacities and power inputs are based on the following conditions (oor heating /cooling )
a. Cooling conditions b. Heating conditions
Indoor Water Temp 23°C/18°C; Indoor Water Temp 30°C/35°C;
Outdoor Air Temp 35°C DB/24°C WB Outdoor Air Temp 7°C DB/6°C WB
Capacities and power inputs are based on the following conditions (FCU or radiator)
a. Cooling conditions b. Heating conditions
Indoor Water Temp 12°C/7°C; Indoor Water Temp 40°C/45°C;
Outdoor Air Temp 35°C DB/24°C WB Outdoor Air Temp 7°C DB/6°C WB
2.3 Flowchart of Model Selection
Calculate the load
Preliminary selection
of unit
Finish unit selection
Actual capacity ＞
Load
Calculate the load
YES
NO
2.4 Design Principle
◆Cooling: capacity of the unit ≥ cooling load of the air conditioning
◆Heating: capacity of the unit ≥ max{ heating load, oor heating load, water heating load}
◆Water Tank: it should be selected based on the sanitary outfit or quantity of users. Each unit can
accommodate only one water tank.