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Design guidefor DVM S WATER

2

IntroductionB

asic configurations

Water piping elem

entsSystem

safety requirem

entsInstallation exam

ple

3

1 Introduction

2 Basic configurations 2-1 Basic configuration of DVM S WATER

3 Water piping elements 3-1 Heat removal equipment 3-2 Heat supply equipment 3-3 Water pipes 3-4 Pumps 3-5 Expansion tank 3-6 Temperature and pressure measurement points 3-7 Water quality

4 System safety requirements 4-1 External contact connection 4-2 Explanation of optional functions 4-3 Anti freezing protection 4-4 Strainer (Mandatory)

5 Installation example 5-1 Closed cooling tower 5-2 Open cooling tower 5-3 Geothermal heat source

04

0505

07 07 11 1115171718

1919202122

23232425

Design guide for DVM S WATER

4

1 Introduction

DVM S WATER combines all the benefits of DVM system with those of water systems :DVM component of the system - DVM S WATER units and indoor units, refrigerant piping and controls - delivers high efficiency combined with exceptional control flexibility. Heat is transferred via PHE inside of DVM S WATER units to or from the 2-pipe water circuit as required, during cooling and heating cycles respectively.On the water side of the system the heat source (water) is supplied to DVM S WATER units throughout the building via the water circuit, which incorporates ancillary elements such as cooling towers, boilers, heat exchangers, pumps, valves, strainers, expansion tanks, air vents and water treatment equipment etc.

Workscope

Design & Installation R & R (example) - In/out door unit : Samsung - Refrigerant pipe : Samsung - CT/boiler/pump : MEP company - Water plumbing : MEP company - GLHX : Geothermal company

Please note that this document is for guidance only and is not the actual design manual. In practice, construction and plumbing methods may vary acording to the projects and local legislation. To complete design and installation of the system, please consult your local design office.

The operating range of DVM S WATER depends on the temperature of the water circuit, which should be maintained between 10°C and 45°C.

Introduction

5

2 Basic configurations

In temperate climatic regions, excess heat within the water circuit can usually be exhausted via a dry cooler or cooling tower. However, alternative heat sinks can also be used, including natural water sources such as rivers, lakes and bore holes - existing process or chilled water circuits can also be utilized if fitted with heat transfer facilities.

Low pressure hot water from a boiler is generally utilized to maintain the required temperature levels within the water circuit - but steam, district/process/industrial heating systems or even solar energy can also act as the heat source.

2-1 Basic configuration of DVM S WATER

Basic

configurations

Sample #1 - In case of using closed type cooling tower and boiler

Sample #2 - In case of using open type cooling tower and boiler

Cooling Tower (closed type)

Cooling Tower (Open type)

3way V/V

3way V/V

3way V/V

ET

ET

ET

Pump

Pump

PumpPump

Pump

ET(Expansion Tank)

Heat exchanger

Heat exchanger

Heat exchanger

LPHW Boiler

LPHW Boiler

Samsung workscope

Samsung workscope

• Closed type Cooling Tower + 3way v/v(for bypass)

• 3 water loop system. (Open type Cooling Tower + Intercooler)

3way v/v : for bypass in spring and autumn season

3way v/v : for bypass in spring and autumn season


6

2-1 Basic configuration of DVM S WATER

2 Basic configurations

Basic

configurations

Sample #3 - In case of using geothermal source

Sample #4 - In case of using hydrothermal source

ET

Pump

ground heat exchanger

Samsung workscope

Samsung workscope

• Geothermal heat pump system

ET

Pump

Pump

Heat exchanger

Standing column well

• Ground water heat pump system

7

3 Water piping elements

3-1 Heat removal equipment

Water at the pre set temperature is supplied to all DVM S WATER outdoor units via closed, 2-pipe circuit.Water temperature within the circuit must be maintained at 10 to 45°C and pumps should be of sufficient duty to match the requirements of all DVM S WATER outdoor units.A strainer should be installed to prevent impurities from entering the water flow. Air purging should be carried out in closed circuit systems.Expansion tanks are also important since they allow for water expansion due to temperature changes within the circuit.

• In cooling mode, the purpose of the DVM system is to reject unwanted heat.

• In an air-cooled DVM outdoor unit, cool ambient air is usually drawn across the condenser coil by means of a propeller fans. High pressure refrigerant heat is transferred to a cooler ambient air and rejected.

• By comparison, in a water-cooled DVM S WATER, cooling water is pumped through the plate type condenser. High pressure refrigerant heat is transferred to a cooler condenser water and rejected.

• water must be supplied to the required locations according to the needs of each DVM S WATER outdoor unit

• head and friction losses should be kept minimum

• water velocity should be properly controlled to avoid water streaming noise, pipe vibration or pipe expansion contraction due to temperature differences.

• attention should be paid to water management: impact of the water quality, corrosion prevention, freezing prevention etc.

• enough arrangements should be provided for easy service and maintenance.

1) When designing a water piping system, the following should be considered :

• The cooling tower is still the most common equipment used for water heat rejection. With the current drive towards energy efficiency, ground water, lakes, rivers and sea have been used as an alternative heat sink medium. Environmental concerns and restrictions however, may limit this potential source.

The cooling tower relies on the process of evaporation, enabling the condenser water circuit to be cooled to a temperature below the ambient wet bulb.

Water piping elem

ents


8

Water piping elements3

Open cooling towers are classified in terms of the airflow configuration. "Forced draught" and "induced draught" towers are the most common types found in the HVAC industry. The forced draught tower is driven by a fan, which blows air through the tower. Induced draught towers pull the air through the tower.Depending on whether the air is drawn against the flow of the water or across the flow of water in the tower, the systems can be further classified as "counter flow" or "cross flow" configurations. When open cooling towers are used it is essential to install intermediate heat exchangers.

This type of unit utilizes axial flow fans and is generally thought to be the most efficient and therefore the most popular, in use today.

Large propeller fans on the air discharge or the top of the tower draw air counter flow or cross flow to the condenser water. Due to the higher discharge velocities they are less susceptible to short air circuits or recirculation. Noise levels are higher due to the low frequency noise associated with propeller and axial fans.

Open type cooling tower

Induced draught tower

3-1 Heat removal equipment

1) Types of cooling towers

Water piping elem

ents

Hot water

Fill

Cold water

Induced draft counterflowtower with fill

Cold water

Hot water distribution

Louvers

FillFill

Sump

Induced draft double-flowcrossflow tower

Forward curved centrifugal fans on the air inlet will force/push the air in either a counter flow or cross flow pattern. Centrifugal fans use more power but generate enough static pressure to overcome any problems associated with internally located cooling towers or those fitted with sound dampers. These towers are quieter than others and are particularly useful for low noise applications. The cross flow tower offers the benefit of a lower profile unit where aesthetics or plant room height may be restricted. On the other hand, the power input is approximately double that of an induced draught tower.

Forced Draught Tower

Fill

Hot water

Cold water

Centrifugal fan

9

Water piping elem

ents

C losed type cooling towers

The water being cooled is contained within a heat exchanger or coil.

Evaporative cooling tower:A secondary open water spray system is used to distribute a film of water to the fins to provide the benefit of evaporative cooling.

Numerous advantages are associated with this arrangement, particularly if the water is pressurized or mixed with chilled water from anexternal source or if the primary pump is sited away from the cooling tower.Closed cooling towers tend to be larger than open models and consequently, more expensive.

On the other hand, since fouling is negligible, closed type systems have lower maintenance costs There are 2 types :

Hot water

Cold water

Centrifugal fan

Dry cooler :The concept is similar to that of an air cooled condenser with condenser water circulating through the tubes and is therefore classed as a closed type system. Due to the higher condenser water temperatures of dry coolers, performance is similar or lower than an equivalent air cooled package.


10

3 Water piping elements3-1 Heat removal equipment

2) Cooling tower selection

• Cooling tower selection is based on the amount of heat to be rejected (the actual cooling capacity + compressor power) and the optimum method of rejecting this heat depending on the most important design criteria, ie. initial cost, efficiency, footprint and noise.

Example) Cooling tower selection

Formula (a)

Formula (b)

Condition

Calculation

Result - Cooling tower selection example

Q = Required capacity[kW] (1kW = 860kcal/h)m = total condenser flow rate (kg/h)ΔT = Leaving water temp - Entering water temp (°C)specific heat for water = 1kcal/kg·°C

- Q(required capacity) = (28+5.05)*10 = 330.5kW = 284,230kcal/h- ΔT=Q / (m x specific heat capacity) = 284,230kcal/h÷ (96ℓ/min x 60min/h x 10 x 1kcal/kg·°C x 1kg/ℓ) = 4.93°C

- Cooling tower Capacity : 284,230kcal/h(72CRT) or more at below condition- Entering water temperature : 35°C- Leaving water temperature : 30°C- OD wet-bulb temperature : 24°C 1CRT for cooling tower = 3,900kcal/h

- Leaving Water Temperature is pre-selected within the limits of the DVM S WATER operation range (10°~45°C)- Entering Water Temperature is calculated by formula (b).- With these values, the cooling tower can be selected.

Required capacity(Q) = Sum(Cooling capacity + Power Input) of DVM S Water units (kW)

ΔT=Q / (m x specific heat)

Reference. Nominal capacity condition for cooling - Indoor temperature 27/19°C, Water in temperature 30°C, Standard water flow rate

Water piping elem

ents

Design condition Model Others

ID temp 27/19°COD temp 35/24°C

Water in 30°C

DVM S Water 10HPCooling capacity : 28kW

Power input : 5.05kWWater flow rate : 96ℓ/min

Quantity : 10eaCombi. Ratio 100%

11

3-2 Heat supply equipment

Reference to select intermediate heat exchanger

Example) Boiler selection

Condition

Calculation

Result - Boiler selection example

Boiler Capacity : 225,750kcal/h or more Entering water temperature : 24°C Leaving water temperature : 20°C

- Q(required capacity) = (31.5-5.25)*10 = 262.5kW = 225,750kcal/h- ΔT=Q / (m x specific heat capacity) = 225,750kcal/h ÷ (96ℓ/min x 60min/h x 10 x 1kcal/kg·°C x 1kg/ℓ) = 3.92 °C

An external heat source, usually in the form of a LPHW boiler and associated heat exchanger is necessary in applications in which the operating temperature of the water circuit cannot be maintained due to insufficient heat recovery within the system. The operating temperature of the boiler should be in the region of 90/70°C.

Water piping elem

ents

Design condition Model Others

ID temp 20/15°COD temp 7/6°CWater in 20°C

DVM S Water 10HPHeating capacity : 31.5kW

Power input : 5.25kWWater flow rate : 96ℓ/min

1.2 ~ 2.1Quantity : 10eaCombi. Ratio 100%

3-3 Water pipesThe 2-pipe layout is commonly used and consists out of one pipe to and one from the terminal (fan coil unit or DVM S WATER). Both chilled or hot water can be supplied to the terminal.

Water pipe selection Process

Pipe design - Direct or reverse return

Select pipe size

Select other parts

Calculation total head loss

Select water pump

Pipe route design - Minimization of pipe length

Flow rate calculation Head loss, friction loss calculation


12


Water piping elem

ents

2) Friction lossesIn order to force a fluid through a pipe, pressure is required to overcome the viscous friction forces. Friction loss occurs when water flow through a pipe.

Note The Darcy equation is the basis of all fluid flow equations and relates the pipe pressure drop required to overcome the fluid

viscous friction forces : ∂P = ( ρ * f * l * v² ) / ( 2 * d )

Where : ∂P= friction losses (Pa)

ρ = fluid density (kg/m³)

f = friction factor, depending on the roughness of the internal surface of the pipe (dimensionless)

l = pipe length (m)

v = fluid velocity (m/s)

d = internal pipe diameter (m)

Most air conditioning systems use steel pipe or copper tubing .

Based on the Darcy equation, the pipe friction / flow tables are made.

3-3 Water pipes

1) Constant water flow

ODU ODU ODU ODU

ODU ODU ODU ODU

a. Constant flow valves

b. Reverse return piping

The constant flow valve maintains a steady flow rate. For the stable operation, This constant water flow valve is required for each DVM S WATER unit.

The constant flow valve maintains a steady flow rate. For the stable operation, This constant water flow valve is required for each DVM S WATER unit.

: constant flow valve

13

Water piping elem

ents

3) Water velocityThe recommended water velocity through the piping is depending on two conditions :• pipe diameter• effect of erosion.

Recommended velocity range Max allowable velocity to minimize erosion

Design water velocity must be decided by the design engineer as Erosion is a function of time.

1year = 8760hr

Velocity ReliabilityHigh Erosion accelerating & noise may occur by contained air & sand & small particleLow Corrosion accelerating & Air may be stuck in the pipe

DiameterVelocity range[m/s]

[mm] [inch]125 or more 5 or more 2.1~2.7

50~100 2~4 1.2~2.1About 25 About 1 0.6~1.2

Running time (hr/year) Velocity(m/s)1,500 3.002,000 2.903,000 2.754,000 2.456,000 2.158,000 1.80

Pipe selection guide

v=10.0m/s

v=7.0m/s

v=5.0m/s

v=4.0m/s

v=3.0m/s

v=2.5m/s

v=2.0m/s

v=3.0m/s

v=2.5m/s

v=2.0m/s

v=1.5m/sv=1.0m

/s

v=0.8m/s

v=0.7m/s

v=0.6m/s

v=0.5m/s

v=0.4m/s

v=0.3m/sv=0.2m

/s

v=0.1m/s

v=1.5m/s

C=13010,000

8,000

6,0005,0004,000

3,000

2,000

1,000800

600500400

300

200

10080

6050

40

30

20

Friction loss(kPa/m)

Flo

w r

ate

(ℓ/m

in)

10

8

654

3

2

10.01 0.02 0.03 0.04 0.050.06 0.08 0.1 0.2 0.3 0.4 0.5 0.6 0.8 1 2 4 6 8 10

300 Su

250 Su

200 Su

150 Su

125 Su

100 Su

80 Su

75 Su

60 Su

50 Su

40 Su

30 Su

25 Su

20 Su

13 Su

10 Su

v=1.0m/s

v=0.8m/s

v=0.7m/s

v=0.6m/s

v=0.5m/s

v=0.4m/s

Type : Stainless steel pipe


14

3 Water piping elements3-3 Water pipes

4) Example of dimensioning the water pipes :

Water piping elem

ents

v=10.0m/s

v=7.0m/s

v=5.0m/s

v=4.0m/s

v=3.0m/s

v=2.5m/s

v=2.0m/s

v=3.0m/s

v=2.5m/s

v=2.0m/s

v=1.5m/sv=1.0m

/s

v=0.8m/s

v=0.7m/s

v=0.6m/s

v=0.5m/s

v=0.4m/s

v=0.3m/sv=0.2m

/s

v=0.1m/s

v=1.5m/s

C=130

40mmhigh friction loss

(2.04kPa/m)

10,000

8,000

6,0005,0004,000

3,000

2,000

1,000800

600500400

300

200

10080

6050

40

30

20


Flo

w r

ate

(ℓ/m

in)

10

8

654

3

2

10.01 0.02 0.03 0.04 0.050.06 0.08 0.1 0.2 0.3 0.4 0.5 0.6 0.8 1 2 4 6 8 10

300 Su

250 Su

200 Su

150 Su

125 Su

100 Su

80 Su

75 Su

60 Su

50 Su

40 Su

30 Su

25 Su

20 Su

13 Su

10 Su

1.2m/s

2.0m/s

v=1.0m/s

v=0.8m/s

v=0.7m/s

v=0.6m/s

v=0.5m/s

v=0.4m/s

75mmlow velocity

(0.79m/s)

v=10.0m/s

v=7.0m/s

v=5.0m/s

v=4.0m/s

v=3.0m/s

v=2.5m/s

v=2.0m/s

v=3.0m/s

v=2.5m/s

v=2.0m/s

v=1.5m/sv=1.0m

/s

v=0.8m/s

v=0.7m/s

v=0.6m/s

v=0.5m/s

v=0.4m/s

v=0.3m/sv=0.2m

/s

v=0.1m/s

v=1.5m/s

C=130

40mmhigh friction loss

(2.04kPa/m)

10,000

8,000

6,0005,0004,000

3,000

2,000

1,000800

600500400

300

200

10080

6050

40

30

20


Flo

w r

ate

(ℓ/m

in)

10

8

654

3

2

10.01 0.02 0.03 0.04 0.050.06 0.08 0.1 0.2 0.3 0.4 0.5 0.6 0.8 1 2 4 6 8 10

300 Su

250 Su

200 Su

150 Su

125 Su

100 Su

80 Su

75 Su

60 Su

50 Su

40 Su

30 Su

25 Su

20 Su

13 Su

10 Su

v=1.0m/s

v=0.8m/s

v=0.7m/s

v=0.6m/s

v=0.5m/s

v=0.4m/s

75mmlow velocity

(0.79m/s)

Hazen-Williams Equal

Example

• Condition - Type : Stainless steel pipe - Water flow : 200l/min - Friction loss : less than 1.2kPa - Select pipe size : ??

• Result #1 - Pipe : 50mm - Velocity : 1.99m/s - Friction loss : 1.05kPa

• Result #2 - Pipe : 60mm - Velocity : 1.28m/s - Friction loss : 0.36kPa ( lower than 0.4kPa - not efficiency)

Model 10HPWater Flow 96ℓ/minFriction loss 0.52kPa/m

Velocity 1.25m/sDiameter 40mm





15

3-4 Pumps

1. H_a : Head pressure by Level difference - Value is 0 in closed loop as no level difference

2. H_p : Friction loss by straight pipes

3. H_f : Equivalent length of friction loss by fittings - refer to the manual of manufacture

4. H_u : Friction loss from the condenser / evaporator in the units(cooling tower & DVM)

Water piping elem

ents

Water pump selection

3 Factor for pump selection

Flow rate :

Power

Total Head

Flow rate / Total head pressure / Power

Sum of required flow rate of each DVM Water.ex) 10HP DVM water 5ea : Total flow rate = 96l/min*5 = 480l/min

- To calculate motor power- This value will be used to select motor of water pump.

Power[kW] = q x ρ x g x h / (3.6 x 106) / η

q = flow rate (m3/h) ρ = density of fluid (kg/m3) (1,000 for water) g = gravity (9.81 m/s2) h = differential head (m) η = pump efficiency

H_t = H_a + H_p + H_f + H_u H_a : Head pressure by Level difference ( H_a value is 0 in closed loop ) H_p : Friction loss by straight pipes H_f : Equivalent length of friction loss by fittings H_u : Friction loss from the condenser / evaporator in the units(cooling tower & DVM)

Pipe size[mm] 15 20 25 32 40 50 65 80Elbow 0.5 0.6 0.9 1.1 1.3 1.6 2.1 3.0T-connection straight through 0.6 0.4 0.6 0.8 0.9 1.1 1.4 1.7T-connection through branch 1.0 1.3 1.8 2.3 2.8 3.5 4.2 5.7Globe valve 4.5 6.5 9.0 11.0 16.0 21.0 26.0 30.0

Example : equivalent length of friction loss by fittings , [m]

Actual head of Delivery

Actual head of Delivery Actual head of

Delivery

Water head

Actual head of suction

Actual head of suction


16

3 Water piping elements3-4 Pumps

Water piping elem

ents

Water pump selection

examplePlease select proper pump for below case

DVM Water 10HP Supply Return

Required flow rate : 96l/minPressure loss of PHE : 30kPa

Pressure loss of Cooling tower : 50kPa

Flow rate : 96l/minLength : 20m

Pipe Diameter : 32mmVelocity : 1.55m/s

Friction loss : 90mmAq/m

Flow rate : 96l/minLength : 25m

Pipe Diameter : 32mmVelocity : 1.55m/s

Friction loss : 90mmAq/m(kg)

H[m]

0

0 2 4 6 8 10 12 14 Q[m3/h]

4

8

-330/2

-260/2

-220/2

-160/2

-80/2

12

16

20

24

28

32

Answer - Flow rate : 96l/min = 5.76m3/hr - Total head pressure(H_t) = 39.7+3.88+80 = 123.58kPa(12.6mAq) H_a : 0 H_p : H_(20+25)*90 = 4050mmAq = 39.7kPa H_f : 1.1*4*90 = 396mmAq = 3.88kPa(Elbow 4ea) H_u : 30kPa(PHE) + 50 = 80kPa - Power =5.76m3/h x 1,000kg/h x 9.81m/s2 x 12.6m ÷ 0.6 ÷ (3.6 x 10^6)kWh/Ws=0.33kW

Check from Catalogue

Cooing Tower

10HP DVM Water

IDU IDU

10m

17

3-6 Temperature and pressure measurement points

Temperature and pressure measurement points should be located at each DVM S WATER condensing unit.

Water piping elem

ents

P

P

P

PT

T

T

T

3-5 Expansion tank

The purpose of the expansion tank is to maintain system pressure by allowing the water to expand when the water temperature increases in order to prevent pipes from bursting. It also provides the means for adding water to the systemAn expansion tank is required in a closed system. In an open system, the reservoir acts as the expansion tank.

The expansion tank can be of the open or closed type.The open expansion tank (reservoir) is located at the suction side of the pump, above the highest point in the system. At this location, the tank provides atmospheric pressure equal to or higher than the pump suction, preventing air from leaking into the system.The closed expansion tank is used in small systems. The tank is located at the suction side of the pump.The capacity of a closed expansion tank is greater than that of an open expansion tank operating under the same conditions. It is recommended that closed type expansion tanks should be used.When sizing the expansion tank, the engineering supplied by the tank manufacturer should be consulted.

Pressure gauge Drain valve

Temperature gauge

Constant flow valve

Stop valve Strainer

2way valve Flexible joint

Service port

P

T

P

T

P

T

P

T

P

T

P

T

P

T

P

T

P

TManual valve

Electric valve

Flow switch Flow switch

For cleaning

Drain Drain

* interlocked with the system


18


System safety

requirements CAUTION

• Circle (O) denotes the factor relevant to corrosion or water scale.

• When the water temperature is over 40˚C, steel without protective coating may corrode when exposed to water. Applying corrosion prevention material or degassing can be an effective measure to prevent corrosion.

• For the cooling water and the make-up water, used under closed circuit water system with closed circuit cooling tower, should satisfy the standard shown in above table.

• Supplied water or make-up water should be tap water, industrial water or groundwater. Purified water, neutralized water and softened water should not be supplied.

• 15 items in the above table is a typical factor for corrosion and/or water scale.

3-7 Water quality

1. Standard of cooling water quality for air conditioning and the number of water quality inspection

Make sure to comply with the standards of water quality management.

�Cooling water with high level of external substances can cause pipe corrosion or creation of water scale which effects the product's performance and lifespan. (Use the appropriate heat source water according to the below table) If the system water is sourced from anything other than the local water supply, make sure to check the quality of water.

For water quality management on the heat source water of closed circuit water cooling must be done according to the below table. If the water quality is not managed according to the below table, it may decrease the performance of air conditioner and cause serious problem on the product.

Classification ItemClosed circuit system Effects Recommended

number for waterquality inspectionHeat source

waterMake-up

waterCorrosion Scale

Standardvalue

pH[25 °C] 7.0~8.0 7.0~8.0

Twice a monthElectric conductivity [25 °C] Twice a month (mS/m)

30 or below 30 or below

Chloride ion (mg Cl-/L) 50 or below 50 or below

Once a month

Sulfate ion (mg S04 2-/L) 50 or below 50 or below

M alkali level [pH 4.8](mg CaCo3/L)


Total hardness (mg CaCo3/L) 70 or below 70 or below

Calcium hardness (mg CaCo3/L)


Ionized silica (mg SiO2/L) 30 or below 30 or below

Reference

Iron (mg Fe/L) 1.0 or below 0.3 or below

Once a month

Copper (mg Cu/L) 1.0 or below 1.0 or below

Sulfate ion (mg S2-/L)Not to bedetected

Not to bedetected

Ammonium ion (mg NH4+/L) 0.3 or below 0.1 or below

Residual chlorine (mg Cl/L) 0.25 or below 0.3 or below

Free carbon dioxide (mg CO2/L) 0.4 or below 0.4 or below

Stability index lass lass

19

4-1 External contact connection

F low switch connection (Mandatory connection)

Pump out connection

• When flow switch is used, it will receive signal of the heat source water circulation and detects if there is any problem on water circulation before operating the outdoor unit.

• When there is no contact signal input to the flow switch, it will be diagnosed as 'Problem with the heat source water circulation' and outdoor unit will stop operating to protect outdoor unit.

• When the main pump is installed to common water pipe, powerless contact signal will be provided. (Refer to 'Installation example of extra controller such as 2way 2way solenoid valve and pump etc' in page 20.)

Flow switch turns on when flow amount increases

Connect flow switch wire to the FLOW-SW IN terminal regardless of the polarityPUMP OUT 2WAY V/V FLOW S/W Flow control

Water Hub PBA

Pump

Power source

Controller

PUMP OUT2WAY V/V FLOW S/W Flow control

Water Hub PBA

CAUTION• Pump out, 2way solenoid valve, flow switch can be used individually or together.

System safety

requirements

2Way solenoid valve

• When installing multiple number of outdoor units to a common water pipe, 2way valve will cut the cooling water supply to an outdoor unit that is not operating, so it will increase the overall efficiency of the system. 2Way solenoid valve will operate automatically depending on the operation status of the indoor and outdoor units. (Outputs contact signal)

• You may select either internal or external power cable connection for the 2way solenoid valve.

PUMP OUT 2WAY V/V FLOW S/W Flow control

(External power)

Power source

External controllerWater Hub PBA

(Internal power)

2Way solenoid valve

Connect the 2way solenoid valve cable to the 2way valve terminal regardless of the polarity. (However, Use external power if the load of solenoid valve is maximum 250 V and current over 0.2 A.)

4 System safety requirements


20


System safety

requirements

4-2 Explanation of optional functions

Flow control

Wiring method for optional functions

• After setting the outdoor unit option switch, you may connect variable flow control valve that is controlled at 0 ~ 10 V of input signal.

• If the power of variable flow control valve is 220-240 V, you may use the internal power of the outdoor unit.

• Use the external power if the load of variable solenoid valve is maximum 250 V and current over 0.2 A.)

• Output range of the variable flow control valve is different depending on the setting of the outdoor unit option switch

• 2way solenoid valve is a type that works at AC 220-240 V 50/60 Hz and supports product with 0.2 A or low. - For 2way solenoid valve with over 0.2 A, connect external power.

- For external power cable for 2way solenoid valve must use 600 V flame-resisting double layered cable.

• Product will not operate when flow switch is not installed.

When valve load is over 0.2 A use external power.

PUMP OUT 2WAY V/V FLOW S/W Flow control

Water Hub PBA

Variable flowcontrol valve

Power source

(External power)(Use internalpower)

Installation example of AC 220-240 V, direct operation type 2way solenoid valve

PUMP/2Way solenoid valve controller (PBA )

Controller

Outdoor unit

2Way solenoid valve

Flow switch

AC 220-240 V AC 220-240 V

2Way solenoidvalve OUT

PUMP OUT

PUMP F/B IN

Relay

Relay

Caution for wiring

Internal part of outdoor unit External part of outdoor unit

21

Wiring method for optional functions

• If the operation type of 2way solenoid valve is different, use extra controller.

- Also use external controller for pump.

- Outdoor unit only provides contact signal needed for 2way solenoid valve and pump operation. Therefore, do not use the contact signal from the air conditioner directly.

• Product will not operate when flow switch is not installed.

• Note 1) : Anti-freeze must be used when temperature of water inlet for heating is below 10°C or ground heat source is used. Maintain appropriate concentration level of anti-freeze according to temperature of water inlet.

• Note 2) : Strict management of anti-freeze concentration level is required. Consult Samsung before application.

• Note 3) : When inlet water temperature is outside of limit, consult Samsung before application.

Installation example of extra controller such as 2way solenoid valve and pump etc.

4-3 Anti freezing protection

PUMP/2Way solenoid valve controller (PBA)

Controller

Outdoor unit

2Way solenoid

valve

Flow switch

AC 220-240 V AC 220-240 V

2Way solenoid valve OUT

PUMP OUT

PUMP F/B IN

Relay

Relay

Caution for wiring

PUMP

AC 220-240 V

2Way solenoid valve, Pump controller

2Way solenoid valve, Pump

controller

Internal part of outdoor unit External part of outdoor unit

FUSE

• When inlet water temperature is lower than 10°C, appropriate anti-freeze must be used according to the temperature. (Set the outdoor unit option switches K21 and K22 according to the usage temperature.)

- When lowest inlet water temperature is -5°C, freezing point of anti-freeze must be lower than -8°C

- When lowest inlet water temperature is -10°C, freezing point of anti-freeze must be lower than -15°C

Design condition

TypeCirculating

waterOperation

Inlet water temperatureRemarks

Main usage range Usage range limit Note 3)

Heat sourcewater

Water loopCooling

20 ~ 35 °C 10 ~ 45 °CRefer to

'Cooling watermanagement'

Heating

Ground heatsource Note 1) Ground loop

Cooling 15 ~ 35 °C 10 ~ 45 °C

Heating 5 ~ 25 °C-5 ~ 45 °C

(-10 ~ 45 °C) Note 2)

System safety

requirements


22


System safety

requirements

• When using ground heat source, use anti-freeze to manage the freezing point. If you do not use anti-freeze, it will cause the pipes to freeze and burst. Note that the manufacturer does not take responsibility for any damage caused.

1) All the circulating water (anti-freeze) and additives (corrosion inhibitor, bacteria inhibitor, foam inhibitors) must be used after consulting with local regulations or relevant authorities for its impact on environment, toxicity, corrosiveness, harmfulness to human and management plan.

2) Designer/engineer must take extra care regarding on handling, packaging and transporting regulations and procedure of the anti-freeze.

3) Do not use the anti-freeze that is harmful to humans or equipment. In addition, anti-freeze must be injected to the pipe according to specification and concentration level that is actually required by system. (Do not directly inject undiluted solution, consult business ordering party or supervisor when undiluted solution was brought to the site)

4) Before injecting the anti-freeze, evacuate any air that may remain in the system and apply pressure to check for leakage.

5) User must monitor and manage periodically to maintain initially designed concentration level of the anti-freeze. If the concentration level decrease due to leakage or over certain period of time, it may cause due to pipe to freeze and burst.

6) Usage condition of the anti-freeze when ground heat exchanger is installed (mandatory)

- Flash point: Flash point of the anti-freeze must be over 90 °C.

- Biochemical oxygen demand: A mount of oxygen in 1 g of anti-freeze at 10 °C must be within 0.1~0.2 g and this value must be maintained for 5 days.

- Freezing point: Maintain concentration level of the anti-freeze so that freezing point of the anti-freeze complies to the setting of the option switch (K21/K22).

- Toxicity : LD50 per each 1 kg of anti-freeze must be less than 5 g.

- Storage stability : It must not be separate when heated or cooled, and also turbidity should not be increased.

- Corrosion resistance : It must be corrosion resistant to all the metallic material used for ground heat pumps and pipes.

- Scale : Scale that has been accumulated on the plate type heat exchanger for one year of performance should not cause performance decrease over 15%.

• Standard data for status of Anti-freeze (Based on temperature of anti-freeze at 15 °C)

Samsung guide

Type of anti-freeze (Based on 15 °C) Concentration [% Wt.] Freezing temperature Density [kg/m3]

Methanol10 -5.6 983.6020 -11.7 975.60

Ethanol10 -3.9 983.6020 -8.3 972.40

Ethylene glycol

10 -3.2 1014.8720 -7.8 1031.3930 -14.1 1047.0740 -22.3 1061.65

Propylene glycol

10 -3.3 1009.7520 -7.1 1020.9130 -12.7 1030.5140 -21.1 1038.65

4-4 Strainer (Mandatory) Purpose : To filter the water and protect plate heat exchanger against dirt.

Installation : Install strainer 50mesh or more for each water inlet of outdoor unit.

Strainer screenFluid Pressure Mesh size Material(strainer/mesh)Water 1.96MPa 50 Mesh or more AISI316 / SUS304

Type Mesh Type Punching Type Mixed Type

Feature

Type Wire Punching in plateWire Type(inner) +

Punching Type(outer)

FeatureFiltration area : large

Stiffness : badFiltration area : small

Stiffness : goodFiltration area : large

Stiffness : good

Water O

4-3 Anti freezing protection

23

Installation example

5-1 Closed cooling tower

P T P TP T P T P T P T

Heat e xchanger

Expansion tank

Expansion tank

Boiler

Cooling to wer

Valve Pressure gauge

Air Vent Temperature gauge

Pump Strainer


P

T

P

T

P

T

P

T

P

T

P

T

P

T

P

T

5 Installation example


24

5 Installation example


5-2 Open cooling tower


Heat e xchanger

Expansion tank

Heat e xchanger

Cooling to wer

Expansion tank

Boiler



Pump Strainer


P

T

P

T

P

T

P

T

P

T

P

T

P

T

P

T

25

5-3 Geothermal heat source


Geothermal Trench

Makeup water tank

Supply header Return header

Geothermal boring hole

Expansion tank



Pump Strainer


P

T

P

T

P

T

P

T

P

T

P

T

P

T

P

T


2014.04

Samsung Electronics Co., LTD.B2B PM / SEHead Office (Suwon Korea) 129, Samsung-Ro, Yeongtong-Gu, Suwon City, Gyeonggi-Do, Korea 443-742Website : www.samsung.com/global/business/system-air-conditioner Email : [email protected]

� Images and data in this book may subject to change without prior notice.

Documents

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