Dettson GREE E Series User manual

Service Manual
E Series Normal-temperature Versati Water Heater
By

Contents
Product Data ..................................................................................................................1
1 Product Data ...............................................................................................................1
1.1 Lineup ...............................................................................................................................1
1.2 Nomenclature....................................................................................................................1
1.3 Product Features ..............................................................................................................1
1.4 Operating Principle ..........................................................................................................3
1.5 Technical Data ..................................................................................................................4
2 Outline Dimensions....................................................................................................7
2.1 Outline Dimensions of the Outdoor Unit ..........................................................................7
2.2 Outline Dimensions of the Indoor Unit ..............................................................................7
3 Explosive Views and Part Lists.................................................................................8
4 Supply Scope............................................................................................................10
Model Selection ........................................................................................................... 11
1 Installation Example................................................................................................. 11
2 Model Selection ........................................................................................................13
2.1 Speculations of Power Supply ........................................................................................13
2.2 Operation Conditions ......................................................................................................13
2.3 Flowchart of Model Selection..........................................................................................13
2.4 Design Principle ..............................................................................................................14
3 Selection of the Underoor Coils............................................................................14
3.1 Calculation of Unit Load for Floor Heating......................................................................14
3.2 Selection of Tube Spacing of the Underoor Coils .........................................................14
3.3 Selection of Loop Quantity of Coils for Each Room........................................................14
4 Quantity and Location of the Water Manifolds ......................................................15
4.1 Design Requirements on Loop Quantity for Circulation Water .......................................15
4.2 Requirements on Installation of the Water Manifold .......................................................17
5 Selection of FCU.......................................................................................................17
5.1 FCU Type Selection ........................................................................................................17
5.2 Matching of Capacity ......................................................................................................17
6 Selection of the Water Tank..................................................................................... 18
6.1 Specications of the Water Tank.....................................................................................18
6.2 Volume Selection of the Water Tank ...............................................................................18
7 Examples for Model Selection.................................................................................19
7.1 General Introduction to the Example Project .................................................................19

7.2 Heat Load Calculation.....................................................................................................19
7.3 Model Selection ..............................................................................................................20
Control..........................................................................................................................21
1 Integral Control Concept ......................................................................................... 21
1.1 Control Principle Diagram ...............................................................................................21
1.2 Control Flowchart............................................................................................................24
2 Main Control Logics.................................................................................................24
2.1 Cooling............................................................................................................................24
2.2 Heating............................................................................................................................25
2.3 Water Heating ...............................................................................................................25
2.4 Shutdown ........................................................................................................................26
2.5 Control to the Compressor..............................................................................................26
2.6 Control to the Fan ...........................................................................................................26
2.7 Control to the 4-way Valve ..............................................................................................26
2.8 Control to the Water Pump .............................................................................................26
2.9 Control the Electronic Expansion Valve ..........................................................................27
2.10 Protection Control .........................................................................................................27
3 Control Panel ............................................................................................................28
3.1 External View ..................................................................................................................28
3.2 Operation Instructions.....................................................................................................30
UNIT INSTALLATION ...................................................................................................59
1 Installation Guides ...................................................................................................59
1.1 Installation Position of the Outdoor Unit..........................................................................59
1.2 Installation Positions of the Indoor Unit...........................................................................60
1.3 Matters Need Attention ...................................................................................................60
2 Field Supplied Pipes and Valves............................................................................. 60
3 Service Tools ............................................................................................................61
4 Installation Instructions...........................................................................................62
4.1 Installation Examples ......................................................................................................62
4.2 Pre-Installation ................................................................................................................63
4.3 Selection of Installation Location ....................................................................................63
4.4 Installation of outdoor unit...............................................................................................64
4.5 Installation of Indoor Unit ................................................................................................65
4.6 Connection of Pipeline....................................................................................................69
4.7 Installation of Insulated Water Tank ................................................................................71
4.8 Electric Wiring .................................................................................................................73

4.9 Wiring Diagram ...............................................................................................................74
4.10 Wiring of the Terminal Board ........................................................................................80
4.11 Wiring of the 2-Way Valve .............................................................................................80
4.12 Wiring of the 3-Way Valve.............................................................................................81
4.13 Wiring of Other Auxiliary Heat Sources.........................................................................82
4.14 Wiring of the Gate-Controller ........................................................................................82
4.15 Wiring of the Remote Air Temperature Sensor .............................................................82
4.16 Wiring of the Thermostat...............................................................................................83
4.17 Wiring of the Control .....................................................................................................84
5 Commissioning and Trial Run.................................................................................87
5.1 Check before Startup......................................................................................................87
5.2 Trial Run..........................................................................................................................88
TEST OPERATION & TROUBLESHOOTING & MAINTENANCE............................... 89
1 Pre-check ..................................................................................................................89
1.1 Check for Wiring .............................................................................................................89
1.2 Check for the Water System ...........................................................................................89
1.3 Check for the Communication System............................................................................90
1.4 Trial Run..........................................................................................................................91
2 Error Code List .........................................................................................................91
3 Flow Chart of Troubleshooting ...............................................................................93
3.1 Compressor High-pressure Protection E1 ......................................................................93
3.2 Compressor Low- pressure Protection E3 .....................................................................94
3.3 Compressor Discharge Temp Protection E4...................................................................94
3.4 Overload Protection of Compressor or Driver Error........................................................95
3.5 DC Fan Error EF .............................................................................................................95
3.6 Temperature Sensor Error ..............................................................................................96
3.7 Communication Malfunction E6 ......................................................................................96
3.8 Capacity Switch Error (Code:"E5") .................................................................................97
4 Diagnosis of Drive....................................................................................................97
4.1 Diagnosis Flowchart of Drive of Single-phase Unit and Three-phase Unit.....................97
5 Daily Maintenance and Repair...............................................................................101
5.1 Daily Maintenance ........................................................................................................101
5.2 Troubleshooting ............................................................................................................101
5.3 Repair ...........................................................................................................................102

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Product Data
1 Product Data
1.1 Lineup
1.1.1 Main Unit
Series Model Product Code
Cooling
Capacity
(kW)
Heating
Capacity
(kW)
Power
Supply Refrigerant Image
VERSATI II
GRS-
CQ16Pd/
NaE-D
ER01001490 49474
(14.5)
52886
(15.5)
208/230VAC
60Hz R410A
1.2 Nomenclature
1.2.1 Main Unit
G RS - C Q 16 Pd / Na E -D (O)
1 2 3 4 5 6 7 8 9 10
NO. Description Options
1 GREE G-GREE Air to water heat pump
2 Heat Pump Water Heater RS
3 Heating Mode S= Static; C=Circulating
4 Function Q=Multi-function; Omit=Single-function
5 Nominal Heating Capacity 6.0=6.0kW; 8.0=8.0kW;10=10kW; 12=12kW; 14=14kW; 16=16kW
6 Compressor Style Pd=DC Inverter; Omit=On/O󰀨
7 Refrigerant Na=R410A
8 Design Serial Number B,C,D,E......
9 Power Supply D=208/230V,~,60Hz
10 Indoor and Outdoor Unit Code I=Indoor unit; O=Outdoor unit
1.3 Product Features
1.3.1 General
GREE air to water heat pump is a completely exible, energy e󰀩cient home heating system that extracts the
heat from the outside air, raises this heat to a higher temperature and then distribute warmth around the home
using under-oor heating, radiators or fan convector heat emitters.

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1.3.2 Features
◆Wide Operation Range
Heating: -4~95°F(-20~35°C); Cooling: 50~118.4°F(10~48°C); Water Heating: -4~113°F(-20~45°C).
◆High-e󰀩ciency Component(Inverter pump, Inverter fan, Plate heat exchanger)
(1) The DC inverter fan can control the air volume accuratately and make the system run more stably and save
more energy.
(2) The high-e󰀩ciency plate heat exchanger will improve the unit’s performance largely at a low price.
◆All-in-one Design
(1) The unit can integrate with terminal units, like the radiator, oor heating device, FCU, water heating device,
solar kit, gas furnace etc. Versatile functions can meet various kinds of demands from di󰀨erent users and
enhance applicability of this product
(2) The all-in-one structure design can save more installation cost, reduce risks of refrigerant leak, and improve
safety and reliability of the system.
◆Brand-new Controller
(1) White appearance, exquisite design, and the wall-mounted design will facilitate installation.
(2) The dot-matrix display can show in both English and Chinese to show information in a more direct and
convenient way.
(3) The six-lattice display pattern will accommodate more information.
(4) The 12V JACK interface can supply power to the control separately and lengthen the communication
distance.
(5) The remote monitoring interface can monitor the unit through the Modbus interface and be integrated into
the BMS system.
◆Smart Control, Powerful Function
(1) The running mode can be switched freely. Furthermore, based on di󰀨erent demands, the holiday mode,
weather-dependent mode, quite timer, temperature timer and oor commissioning can activated.
(2) Multiple protections can make this product much safer. The added electric heater will prevent the plate heat
exchanger from being frostbitten owing to too low water temperature and resultantly extend the service life
of the product and enhance its safety and reliability.
(3) The newly developed smart defrosting control program, “only initiates the defrost function when necessary",
can bring more comfortability, avoid inadequacy of heat supply and ensure sustainable heat supply for the
users.
1.4 Operating Principle

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1.4.1 Schematic Diagram
1
2
3
4
5
6
7
8
9
10
17
16
21
24
26
27
28
29 30
22
23 25
15
20
Outdoor Unit
31
32
Indoor Unit
12
13
D
C
E
S
18
19
14
Field Supplied
35
33
34
36
37
38
3940
41
42
43
44
45
46
47
11
48
49
50
No. Name No. Name No. Name
1 Compressor 18 Liquid Temperature
Sensor of the PHE 35 Water Tank
2Discharge Temperature
Sensor 19 Gas Temperature Sensor of the PHE 36 Leaving Water Temperature Sensor of the Solar System
3 High Pressure Switch 20 Plate-type Exchanger 37 Flow Switch for the Solar
System
4 Pressure Sensor 21
Leaving Water
Temperature
of the PHE
38 Water Pump for the Solar
System
5 4-way Valve 22
Entering Water
Temperature
of the PHE
39 Solar Panel
6 Finned Exchanger 23 Automatic Exhaust Valve 40 Solar Panel Temperature Sensor
7Environment Temperature
Sensor 24 Electric Heater 41 Entering Water Temperature for the Solar System
8Defrosting Temperature
Sensor 25 Safety Valve 42 Water Knockout Vessel
9 Filter 26 Expansion Tank 43 Electric 2-way Valve 1
10 Electronic Expansion Valve 27
Leaving Water
Temperature
of the Electric Heater
44 Floor Radiator
11 Filter 28 Water Pump 45 Water Collector
12 Liquid Valve 29 Flow Switch 46 FCU
13 Gas Valve 30 Leaving Water Pipe
Connector 47 Pressure Di󰀨erential Bypass Valve
14 Filter 31 Entering Water Pipe
Connector 48 Water Tank Temperature Sensor 2
15 Vapor-liquid Separator 32 Water Filter 49 Liquid Valve Connector
16 Suction Temperature Sensor 33 Electric 3-way Valve 2 50 Gas Valve Connector
17 Pressure Sensor 34 Water Tank Temperature
Sensor 1

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1.5 Technical Data
1.5.1 Parameter List
Model GRS-CQ16Pd/NaE-D
Product Code ER01001490
Capacity*1 Cooling(oor cooling) Btu/h(kW) 49474(14.5)
Heating(oor heating) Btu/h(kW) 52886(15.5)
Power Input*1 Cooling(oor cooling) kW 3.8
Heating(oor heating) kW 3.75
EER*1(oor cooling) (Btu/h)/W, (W/W) 13.02(3.82)
COP*1(oor heating) (Btu/h)/W, (W/W) 14.10(4.13)
Capacity*2 Cooling(for Fan coil) Btu/h(kW) 33096(9.7)
Heating(Fan coil or Radiator) Btu/h(kW) 49474(14.5)
Power Input*2 Cooling(for Fan coil) kW 3.3
Heating(Fan coil or Radiator) kW 4.5
EER*2(for Fan coil) (Btu/h)/W, (W/W) 10.03(2.94)
COP*2(Fan coil or Radiator) (Btu/h)/W, (W/W) 10.99(3.22)
Refrigerant charge volume oz(kg) 127(3.6)
Sanitary water Temperature °F (°C) 104~176(40~80)
Outdoor Unit Model GRS-CQ16Pd/NaE-D(O)
Outdoor Unit Product Code ER010W1490
Sound
Pressure
Level
cooling dB(A) 58
heating dB(A) 58
Dimensions
(W×D×H)
Outline inch(mm) 35-7/16×16-1/4×53(900×412×1345)
Packaged inch(mm) 39-5/16×18-1/16×59-5/8(998×458×1515)
Net weight/Gross weight lb(kg) 235.9/258.0(107/117)
Indoor Unit Model GRS-CQ16Pd/NaE- D(I)
Indoor Unit Product Code ER010N1490
Sound
Pressure
Level
cooling dB(A) 31
heating dB(A) 31
Dimensions
(W×D×H)
Outline inch(mm) 38-5/8×12-3/4×19-11/16(981×324×500)
Packaged inch(mm) 41-1/16×15-9/16×23-
15/16(1043×395×608)
Net weight/Gross weight lb(kg) 121.3/141.1(55/64)
Notes
(a) “*1” indicates the capacity and power input are tested based on the conditions below:
Cooling:
Indoor Water Temperature: 73.4°F/64.4°F(23°C/18°C); Outdoor Temperature: 95°F DB/75.2°F WB(35°C
DB/24°C WB)
Heating:
Indoor Water Temperature: 86°F/95°F(30°C/35°C); Outdoor Temperature: 44.6°F DB/42.8°F WB(7°C DB/6°C
WB)
(b) “*2” indicates the capacity and power input are tested based on the conditions below:
Cooling:
Indoor Water Temperature: 53.6°F/45°F(12°C/7°C); Outdoor Temperature: 95°F DB/75.2°F WB(35°C DB/24°C
WB)
Heating:
Indoor Water Temperature: 104°F/113°F(40°C/45°C); Outdoor Temperature: 44.6°F DB/42.8°F WB(7°C DB/6°C
WB)

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1.5.2 Nominal Working Conditions
Item
Water Side Air side
Entering Water Temp
°F(°C)
Leaving Water
Temperature °F(°C)
Dry Bulb Temperature
°F(°C)
Wet Bulb Temperature
°F(°C)
Floor Heating 86(30) 95(35) 44.6(7) 42.8(6)
FCU Heating 104(40) 113(45) 44.6(7) 42.8(6)
Floor Cooling 73.4(23) 64.4(18) 95(35) —
FCU Cooling 53.6(12) 45(7) 95(35) —
Water Heating 50(10) 122(50) 44.6(7) 42.8(6)
1.5.3 Operation Range
Item Water Side Air side
Leaving Water Temperature °F(°C) Environment Dry Bulb Temperature °F(°C)
Cooling 45~77(7~25) 50~118.4(10~48)
Heating 77~131(25~55) -4~95(-20~35)
Water Heating 104~176(40~80) (Water Tank Temperature) -4~113(-20~45)
Note: when operating conditions are out of the range listed above, please contact GREE.
1.5.4 Electric Data
Model
Power Supply Leakage Switch Minimum Sectional
Area of Earth Wire
Minimum Sectional
Area of Power
Supply Wire
V,Ph,Hz (A) / /
GRS-CQ16Pd/NaE-D(O)
208/230VAC,60Hz
40 AWG8 2×AWG8
GRS-CQ16Pd/NaE-D(I) 30 AWG10 2×AWG10
The power of the auxiliary electric heater for the water tank is not allowed to exceed 10236Btu/h(3kW).
Notes
(a) Leakage Switch is necessary for additional installation. If circuit breakers with leakage protection are in use,
action response time must be less than 0.1 second, leakage circuit must be 30mA.
(b) The above selected power cable diameters are determined based on assumption of distance from the
distribution cabinet to the unit less than 75m. If cables are laid out in a distance of 75m to 150m, diameter of
power cable must be increased to a further grade.
(c) The power supply must be of rated voltage of the unit and special electrical line for air-conditioning.
(d) All electrical installation shall be carried out by professional technicians in accordance with the local laws
and regulations.
(e) Ensure safe grounding and the grounding wire shall be connected with the special grounding equipment of
the building and must be installed by professional technicians.
(f) The specications of the breaker and power cable listed in the table above are determined based on the
maximum power (maximum amps) of the unit.
(g) The specications of the power cable listed in the table above are applied to the conduit-guarded multi-wire
copper cable (like, YJV XLPE insulated power cable) used at 40°C and resistible to 90°C(see IEC 60364-5-52).
If the working condition changes, they should be modied according to the local applicable standards.
(h) The specifications of the breaker listed in the table above are applied to the breaker with the working
temperature at 40°C. If the working condition changes, they should be modied according to the related local
applicable standard.
(i) A circuit breaker must be added to the fixed line. The circuit breaker is all-pole disconnected and the
breaking distance of the contact is at least 3mm.

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1.5.5 Capacity Correction
◆Cooling Capacity Correction
GRS-CQ16Pd/NaE-D
Performance correction
Leaving Chilled Water °C (°F)Ambient Temperature °C (°F)
25(77) 30(86) 35(95) 40(104) 45(113)
5(41.0) 0.995 0.955 0.905 0.855 0.805
6(42.8) 1.045 1.005 0.955 0.905 0.855
7(44.6) 1.090 1.050 1.000 0.950 0.900
8(46.4) 1.145 1.102 1.052 1.000 0.950
9(48.2) 1.190 1.150 1.100 1.050 1.002
10(50.0) 1.245 1.200 1.150 1.100 1.050
11(51.8) 1.290 1.250 1.202 1.152 1.102
12(53.6) 1.340 1.300 1.252 1.200 1.152
13(55.4) 1.390 1.350 1.302 1.252 1.202
14(57.2) 1.442 1.402 1.350 1.302 1.252
15(59.0) 1.490 1.450 1.400 1.350 1.302
18(64.4) 1.539 1.502 1.451 1.402 1.350
Calculation of actual cooling capacity: actual cooling capacity = nominal cooling capacity x cooling capacity
correction coe󰀩cient.
◆Heating Capacity Correction
GRS-CQ16Pd/NaE-D
Performance Correction
Outow
Heated
Water °C(°F)
Ambient Temperature °C(°F)
-15(5) -10(14) -5(23) 0(32) 5(41.0) 10(50) 15(59.0) 20(68.0) 25(77.4)
30(86) 0.81 0.91 1.00 1.10 1.18 1.26 1.35 1.41 1.45
35(95) 0.74 0.84 0.93 1.03 1.11 1.19 1.28 1.36 1.41
40(104) 0.67 0.77 0.87 0.96 1.04 1.12 1.20 1.25 1.31
45(113) 0.60 0.70 0.80 0.89 0.97 1.05 1.13 1.19 1.25
50(122) 0.53 0.63 0.73 0.82 0.90 0.98 1.06 1.11 1.18
55(131) 0.46 0.56 0.66 0.74 0.83 0.90 0.98 1.05 1.10
Calculation of actual heating capacity: actual heating capacity = nominal heating capacity x heating capacity
correction coe󰀩cient.

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2 Outline Dimensions
2.1 Outline Dimensions of the Outdoor Unit
(1) GRS-CQ16Pd/NaE-D(O)
Unit:mm (inch)
1326 (52-3/16)
340 (13-3/8)
378 (14-7/8)
412 (16-1/4)
900 (35-7/16)
572 (22-1/2)
1345 (53)
2.2 Outline Dimensions of the Indoor Unit
(1) GRS-CQ16Pd/NaE-D(I)
Unit: mm (inch)
500 (19-11/16)
324 (12-3/4)
981 (38-5/8)
900 (35-7/16)

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3 Explosive Views and Part Lists
(1) GRS-CQ16Pd/NaE-D(I)
1
2
3
4
5
6
9
10
11
12
13
14
15
16
17
18 19 20
87
Parts List of GRS-CQ16Pd/NaE-D(I) for ER010N1490
No. Name of part Part Code Quantity
1Display Board 30292000047 1
2Temp Sensor Sleeving 05212423 5
3Water Pressure Gauge 49028009 1
4Strainer 07412808 1
5Electric Box Assy 100002064994 1
6Plate-type Heat Exchanger 00902800030 1
7Expansion Vessel 07422800004 1
8Steam current Switch sub- Assy 45028062 1
9Electric heater 320004060054 1
10Auto Air Outlet Valve 07108208 1
11 Relief Valve 07382814 1
12 Temperature Sensor 3900028316G 1
13 Transformer 4311027002 1
14 Terminal Board 422000000016 1
15 Terminal Board 422000000010 1
16 Thermostat 4504800201 1
17 Terminal Board 422000000025 1
18 Main Board 300002060758 1
19 Bipolar AC Contactor 44010221 3

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No. Name of part Part Code Quantity
20 Receiver Board 30261014 1
(2) GRS-CQ16Pd/NaE-D(O)
Parts List of GRS-CQ16Pd/NaE-D(O) for ER010W1490.
No. Name of part Part Code Quantity
1Electric Box Assy 100002064984 1
2Rear Grill 016001000045 1
3Condenser Sub-Assy 0115410000802F 1
4Supporting Strip(Condenser) 01894100026 1
5Capillary tube 81020167 4
6Silencer 07245012 1
7Strainer 0721212101 1
8Pressure Protect Switch 46020006 1
9Pressure Protect Switch 46020007 1
10 Magnet Coil 4300040032 1
11 Fuse 06332200001 1
12 4-Way Valve 43040000002 1
13 Sensor (High Pressure) 322101032 1
14 Strainer 07210037 1
15 Strainer 0721200102 1
16 Electronic Expansion Valve Fitting 4304413221 1
17 Electronic Expansion Valve 43044100172 1
18 Cut o󰀨 Valve 07330000002 1

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No. Name of part Part Code Quantity
19 Gas-liquid Separator 035027060007 1
20 Right Connection Board 01344100003P 1
21 Cut o󰀨 Valve 07334100016 1
22 Compressor and Fittings 00204100001 1
23 Electrical Heater(Compressor) 7651521216 1
24 Sensor Support 26905202 1
25 Drainage Connecter 06123401 1
26 Drainage hole Cap 06813401 3
27 Front Grill 016004060002 2
28 Handle 2623525309 2
29 Cabinet 01514100002P 1
30 Di󰀨user 10474100001 2
31 Axial Flow Fan 10338731 2
32 Left Side Plate 01314100013P 1
33 Electrical Heater 765100047 1
34 Brushless DC Motor 15704100013 1
35 Motor Support 01805200243 1
36 Brushless DC Motor 1570410001301 1
37 Motor Support Sub-Assy 01805200244 1
38 Terminal Board 42011242 1
39 Main Board 30227000038 1
40 Filter Board 30226000065 1
41 Main Board 300027000068 1
42 Filter Board 300020000003 1
43 Inductance 43120122 1
44 Inductance Assy 01394100050 1
45 Radiator 49018000013 1
46 Coping 01264100008P 1
4 Supply Scope
Name Standard Optional Field Supplied
Owner's Manual for the Main Unit √/ /
Owner’s Manual for the Control √ / /
2-way Valve / / √
3-way Valve / / √
Remote Temperature Sensor √/ /
Wired Controller √/ /
Communication Cable √/ /
Water Tank Temperature Sensor √ / /
Expansion Bolt √/ /
Solar System Water Pump / √ /
Solar System Flow Switch / √ /

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Model Selection
1 Installation Example
CASE 1: Connecting Under-oor Coil for Heating and Cooling
Outdoor unit Indoor unit
Underfloor coil
FCU 1
Radiator
FCU 2
2-way valve
(Field supplied)
Control line
Remote room thermostat
(Field supplied)
Low-temp line
By-pass valve
(Field supplied)
Hi-temp line
Notes
(a) The two-way valve is very important to prevent dew condensation on the oor and radiator at the cooling
mode;
(b) Type and specication of the thermostat should comply with installation of this manual;
(c) The bypass valve must be installed to secure enough water flow rate, and should be installed at the
collector.
(d) When the FCU and the underoor coil are used at the same time, performance of the underoor coil is
satised rstly. When performance of the FCU is required, then “Floor cong” should be set to “Without”.

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CASE 2: Connecting Sanitary Water Tank
Outdoor unit Indoor unit
City water
Booster heater
Control line
Low-temp line
3-way valve
(Field supplied)
By-pass valve
(Field supplied)
2-way valve
(Field supplied)
Remote room thermostat
(Field supplied)
Hi-temp line
Under floor coil
FCU 1
Radiator
Hot water
Sanitoary water tank
FCU 2
Notes
(a) The two-way valve is very important to prevent dew condensation on the oor and FCU while cooling mode.
(b) In this case, three-way valve should be installed and should comply with installation of this manual;
(c) When the FCU and the underoor coil are used at the same time, performance of the underoor coil is
satised rstly. When performance of the FCU is required, then “Floor cong” s hould be set to “Without”.
(d) Sanitary water tank should be equipped with internal electric heater to secure enough heat energy in very
cold days.
CASE 3: Connecting Sanitary Water Tank and Heat Emitters for Heating and Cooling
Under floor coil
FCU 1 FCU 2
Outdoor unit
Indoor unit Solar panel sets
Hot water
City water
Low-temp lineHi-temp lineControl line
By-pass valve
(field supplied)
3-way valve
(field supplied)
2-way valve
(field supplied)
Remote room thermostat
(field supplied)
Water flow
switch
Solar pump
Booster
heater
Sanitary water
tank
Notes
(a) The two-way valve is very important to prevent dew condensation on the oor and radiator at the cooling
mode.
(b) In this case, three-way valve should be installed and should be complied with installation of this manual;

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(c) Sanitary water tank should be equipped with internal electric heater to secure enough heat energy in the
very cold days.
(d) The 3-Way valve is automatic controlled by the unit. It switches to water tank loop for the water heating
mode and switches to oor/FCU loop at the space cooling/heating mode.
(e) When the FCU and the underoor coil are used at the same time, performance of the underoor coil is
satised rstly. When performance of the FCU is required, then “Floor cong” s hould be set to “Without”.
(f) For the solar heating system, only the control port is available and relative accessories are absent.
2 Model Selection
2.1 Speculations of Power Supply
Power Supply
208/230VAC 60Hz
GRS-CQ16Pd/NaE-D
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 73.4°F/64.4°F(23°C/18°C); Indoor Water Temp 86°F/95°F(30°C/35°C);
Outdoor Air Temp 95°F DB/75.2°F WB(35°C DB/24°C WB) Outdoor Air Temp 44.6°F DB/42.8°F WB(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 53.6°F/45°F(12°C/7°C); Indoor Water Temp 104°F/113°F(40°C/45°C);
Outdoor Air Temp 95°F DB/75.2°F WB(35°C DB/24°C WB) Outdoor Air Temp 44.6°F DB/42.8°F WB(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

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2.4 Design Principle
(1) Cooling: capacity of the unit ≥ cooling load of the air conditioning
(2) Heating: capacity of the unit ≥ max{ heating load, oor heating load, water heating load}
(3) Water Tank: it should be selected based on the sanitary outfit or quantity of users. Each unit can
accommodate only one water tank.
3 Selection of the Underoor Coils
3.1 Calculation of Unit Load for Floor Heating
Empirical Values of Floor Heating Load Per Square Meter
Apartment W/m2
Dining Room 100~120
Mater Room 100~110
Guest Room 110~130
Study Room 90~110
Villa W/m2
Dining Room 110~140
Mater Room 100~120
Guest Room 100~130
Study Room 100~120
Notes
(a) Villas whose load is generally larger than the apartments should take the value between the middle and the
maximum empirical values listed above.
(b) The top layer whose load is generally larger than the middle or bottom layer should take the maximum
empirical value.
(c) The guest room whose load is generally much larger should take the value between the intermediate and
the maximum empirical values listed above.
(d) For those whose external walls or glass areas are large, it is recommended to take the load calculation.
(e) The heating load for the bathroom is generally 500W/room.
3.2 Selection of Tube Spacing of the Underoor Coils
Tube spacing of the underoor coils which will directly a󰀨ect heat dissipation of the oor depends on the tube
material, indoor design temperature, supply water temperature and oor material.
Heat Dissipation of Commonly Used Coils
(Tube material: PE-X, Indoor temperature:18°C, Average water temperature:45°C)
Floor Material
Thermal
Resistance
m2·K/W
Tube Spacing
mm
Heat
Dissipation
W/m2
Tube Spacing
mm
Heat
Dissipation
W/m2
Stone 0.02 200 147.0 150 159.8
Wood 0.075 200 111.2 150 117.8
The dissipated heat of the oor coil is larger than the load for the oor heating system; however the deviation
cannot be larger than 10%.
3.3 Selection of Loop Quantity of Coils for Each Room
3.3.1 Type of Underoor Coils
When selecting underoor coils, we should consider both their comfortability and heating capacity. The most
commonly used coils are as shown below.

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Square-shaped Coil (Recommended)
U-shaped Coil
Length of coils is calculated as below:
Square-shaped coil: =L*W/tube spacing=area/tube spacing
U-shaped coil: =L-1+L*W/tube spacing=L-1+area/tube spacing
The reason why the square-shaped coils are recommended is because they can keep even temperature
distribution. Special demand can be met by adjusting the tube spacing.
Distance from the room to the water manifold should be estimated according to the actual conditions of the
project and generally should not exceed 30m.
3.3.2 Selection of Loop Quantity for Each Room
(1) Length of a single loop should not exceed 100m. If so, it should be divided into multiple loops.
(2) Area of a single loop=tube length×tube spacing=100m×150mm=15m2
B
M
Underfloor Coil
Selected
Unit
Length of underoor coils is recommended to be within 100m and length of each branch should be kept the
same to the most extent.
4 Quantity and Location of the Water Manifolds
The water manifold is a kind of device for distributing water for the water supply and return tubes.
4.1 Design Requirements on Loop Quantity for Circulation Water
(1) One water manifold is allowed for at most eight loops. When quantity of loops exceeds 12, then two water
manifolds should be used, or it will cause uneven water distribution.
(2) The maximum ow rate of the water manifold should be less than 0.8m/s.
(3) The inlet and outlet of each loop should be connected to the water manifold and the inner diameter of the
water manifold should be or larger than that of the main water supply/return tube.
Calculation of loop quantity for circulation water can be done as per the formula below:
N=A/A1
N——loop quantity
A—— total oor heating area (unit: m2)
A1—— oor heating area per single loop (unit: m2)

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Example for how to calculating the oor heating area per single loop: when the tube length is 120m, and tube
spacing is 200mm, then the oor heating area per single loop is 120×0.2=24m2.
(4) One water manifold cannot be used for di󰀨erent oors, or it would cause uneven water distribution.
(5) Distance between the unit and the water manifold should be within 15m. If the distance exceeds 20m, then
it is required to calculate the hydraulic power.