Installation Mechanical — EVP . Trane RAUJ-C25, RAUJ-C50, RAUJ-C80, RAUJ-C60, RAUJ-C20, RAUJ-D10, RAUJ-D12, RAUJ-C40, RAUJ-C30

Installation Mechanical — EVP

EVP Chilled Water Piping

Requirements

• Install properly sized chilled water pipe between the

EVP chiller and the supporting equipment. See

Chilled Water Piping section for recommended system components and guidelines.

• Install supply and return water side pressure gauges (with isolation valves.)

• Install thermometers in water supply and return piping.

• Install isolation (shutoff) valves in water supply and return piping.

• Install a properly sized strainer in the supply piping.

• Install blowdown (recommended) valve or plug in strainer cleanout.

• Install a balancing valve in the return piping.

• Install a water flow switch in the return piping.

• Install chilled solution sensor well and sensor in the water outlet piping.

• Install freezestat well and freezestat bulb in the water outlet piping.

• Install chiller piping drain with shutoff valve.

• Install 1/2” x 14 NPT stainless steel or PVC plug in braze plate chiller body.

• Flush the chilled solution piping system, if applicable.

• Connect the chilled solution piping to the chiller.

• The braze plate chiller is intended for indoor application. If a subfreezing location is required, contact Trane for installation precautions required to prevent damage.

• If using an acidic, commercial flushing solution to prevent damage to the internal evaporator components, flush all chilled solution piping before making the final connection to the EVP chiller.

Typical Field-Installed EVP

Chiller Evaporator Piping

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BA g--2 he att e prre ve assssa ess..

1. Install the TXV(s) directly to the unit liquid connection. See TXV recommendations in the Tube

Size and Component Selection Application Guide, publication number SS-APG012-EN.

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2. Locate TXV bulb on top of the suction line 12” from the heat exchanger outlet.

3. Secure the bulb to the suction line with two clamps provided by the manufacturer and insulate the bulb.

4. Locate liquid line solenoid valve(s) near TXV.

5. Install the Frostat™ according to instructions enclosed in the kit as close to the evaporator as possible.

TXV for Remote Chiller

Piping between TXV and Chiller, a braze plate heat exchanger (BPHE), must be 8-12” long and same size as BPHE inlet ID. Field supplied reducer(s) may be required at TXV. A bleed port valve is not required with brazed plate heat exchanger applications.

• Install reducers at the TXV outlet only.

• See Dimensions and Weights chapter for

BPHE inlet dimensions.

• See Expansion Valve Selection tables in the

Installation Mechanical chapter for valve selections.

SS-SVX11K-EN 55

Figure 39.

EVP chiller, typical refrigerant piping

(2 circuit system)

Gauge Ports &

Superheat

Adjustment Port

#1 Suction Line

#2 Suction Line

The minimum and maximum water flow rates are given in the General Data section. Water flow rates below the tabulated values will result in laminar flow causing freeze-up problems, scaling, stratification and poor system control. Flow rates exceeding the maximum listed could result in very high pressure drop, erosion of the heat exchanger and damage to the water flow switch.

Water Temperature Limits

#1 Liquid Line

Charging Ports

Expansion Valve

Moisture Indicator

Solenoid Valve

(Migration only)

Refrigerant “Shut Off” Valve

#2 Liquid Line

Remote EVP Chiller

Water Treatment

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The use of untreated or improperly treated water could result in scaling, erosion, corrosion, and algae or slime buildup in the heat exchanger. This will adversely affect system capacity. Proper water treatment must be determined locally and depends on the type of system and local water characteristics. Neither salt nor brackish water is recommend, use of either will lead to a shortened heat exchanger life. Trane encourages employment of a qualified water treatment specialist, familiar with local water conditions, to assist in the establishment of a proper water treatment program.

Water Flow Limits

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Catalog chiller performance data is based on a water temperature drop of 10°F . Full load chilled water temperature drops from 8 to 14°F may be used as long as minimum and maximum water temperature and minimum and maximum flow rates are not violated.

Leaving water temperatures below 42°F require freeze protection down to 15°F. The maximum water temperature that can be circulated through the chiller when the unit is not operating is 125°F. Evaporator damage could result above this temperature.

Short Water Loops

Adequate chilled water system water volume is an important system design parameter because it provides for stable chilled water temperature control and helps limit unacceptable short cycling of chiller compressors. Typically, a five-minute water loop circulation time is sufficient to prevent short water loop issues. Therefore, as a guideline, ensure the volume of water in the chilled water loop equals or exceeds five times the evaporator flow rate. For systems with a rapidly changing load profile the amount of volume should be increased.

SS-SVX11K-EN

possible to maintain constant water flow through the water loop.

Chilled Water Piping

Typical Water Piping

Figure below illustrates typical water piping components for remote chiller applications. (Remote

Figure 40.

EVP chiller — typical water piping

Pipe Connections

Water Strainer

Air Vents

Chiller accessory kit includes strainer, water flow switch, pipe stubs, couplings, evaporator insulation and mounting legs, and a ship separate braze plate heat exchanger.)

Supply Line Outlet

Flow Switch

Air Vents

Shutoff Valves

Unions

Vibration Eliminators

Balancing Valve

Gate Valves

Pressure Gauge

Unions

Vibration Eliminators

Thermometers

Gate Valves

Return Line (Inlet)

(See Note 1)

Supply Line Outlet

• Shutoff valves are required for evaporator servicing.

• Evaporator is shown for illustration purposes only.

• Water inlet, outlet diameter dimensional locations depend on unit size.

• Water connections at the evaporator are grooved.

• Field supplied 1/2” x 14 NPTE stainless steel or PVC plug required.

• Locate freezestat and discharge temperature sensors close to the water outlet.

• Install drain with shutoff valve at low point in leaving piping before system valve.

Foreign matter in the chilled water system will increase pressure drop and reduce water flow. Installation of a properly selected strainer is also necessary to prevent debris larger than 0.039” from entering the heat exchanger. All building piping must be thoroughly flushed before making the final piping connections to the heat exchanger. The strainer must also be cleaned prior to initial start-up.

risks plugging chiller with debris and reducing capacity.

To reduce heat loss and prevent condensation, insulation should be applied to piping. Expansion tanks are also usually required to accommodate chilled water volume changes.

SS-SVX11K-EN 57

Braze Plate (BPHE) Chiller

Evaporator water inlet and outlet types, sizes and locations are shown in drawings in Dimensions and

Weights chapter. Installation of a field provided 1/2” x

14 NPTE stainless steel or PVC plug is required.

Strainer

Install a strainer in the water supply line to protect the chiller from plugging with system piping debris.

Table 17.

Chiller water pressure drop, Ft H2O

Flow

(GPM)

120

140

160

180

200

240

70

80

90

100

280

320

360

400

25

30

35

40

45

50

60

20

3.7

5.2

6.9

8.8

10.9

13.3

18.5

24.6

25

3.2

4.2

5.4

6.7

8.2

11.4

15.2

19.4

24.1

Chilled Water Flow Switch

30

8.9

11.4

14.2

17.3

3.1

3.9

4.8

6.7

40

5.3

7.5

10.1

13.0

16.3

19.9

28.3

10.9

15.4

20.7

26.7

4.1

5.5

7.1

8.9

Strainers should be installed as close as practical to the heat exchanger water inlet (the remote chiller accessory kit includes strainer and piping to connect with BPHE). A field provided blow down valve

(recommended) or plug must be installed in strainer cleanout if not present.

Size, Tons

50 60

5.0

6.3

7.7

10.9

14.6

18.9

23.6

80

4.3

6.1

8.2

10.6

13.2

16.2

22.9

100

3.2

4.4

5.6

7.1

8.7

12.3

16.5

21.3

26.7

120

4.8

6.1

7.4

10.6

14.2

18.3

23.0

28.2

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58 SS-SVX11K-EN

Figure 41.

Optional flow switch

3-1/4”

1-5/8”

1/2” NPT

4-7/8”

1-15/16”

Hex

1” NPT

3-1/2”

1-1/8”

Install a flow switch or other flow sensing device to prevent or stop the compressor operation if the water flow drops below minimum limits. Locate the device in the chilled water return line as shown

Figure 40, p. 57

.

Install per switch manufacturer’s instructions and refer to the field wiring and unit schematics for the flow switch electrical interlock connections. Adjust switch trip point to prevent operation below minimum limits.

The water flow switch included in the EVP chiller accessory kit must be adjusted to prevent flow below the minimum limit. To set the flow limit:

1. Establish minimum water flow.

2. Rotate the flow switch adjustment screw until the switch opens. This gets close to the correct setting but final adjustment must be done without water flow.

3. Beginning from water off, start flow and adjust

GPM until the switch trips. If flow rate is below minimum, stop water flow and rotate adjusting screw accordingly.

4. Repeat until the switch trips at or above minimum flow.

table to determine water flow rate. See General

Data for minimum flow limits.

Air Vents

Vents must be installed at high points in the piping system to facilitate air purging during the filling process. Air vents between the system shut off valve and heat exchanger are also useful for EVP chiller service and shutdown.

Water Pressure Gauges

Install pressure gauge(s) to monitor the entering and leaving chilled water pressure, and strainer condition.

Water Shutoff Valves

Provide shutoff valves in the "Supply" and "Return" pipe near the chiller so the gauge(s), thermostats, sensors, strainer, etc., can be isolated during service.

Pipe Unions

Use pipe unions to simplify disassembly for system service. Use vibration eliminators to prevent transmitting vibrations through the water lines.

Thermometers

Install thermometers in the lines to monitor the evaporator entering and leaving water temperatures.

Balancing Valves

Install a balancing cock (valve) in the leaving water line.

It will be used to establish a balanced flow.

have shutoff valves installed to isolate the evaporator for service.

Chiller Drain

Drain piping, with shut off valve, must be installed at the lowest point between the chiller and system piping valves to allow water removal for service and shut down procedures. The drain must be piped to a suitable facility.

system with water.

Water Temperature Sensor

The temperature sensor and sensor well must be installed in the leaving water piping as close to the chiller as possible. Both devices are located inside the remote panel. Thermal paste is also provided inside the remote panel and must be used when installing the sensor into the sensor-well.

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Figure below illustrates the sensor well dimensions.

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Figure 42.

Freezestat bulbwell, temperature sensor and well

Bushing

Freezestat (6S12) Bulbwell

Set Screw

1/2” NPT Adapter

3/8”

1/4” 1-13/16” 2-13/16”

Temperature Sensor Bulbwell

1/2” NPT chiller as possible. It should be located upstream of the temperature sensor location. The freezestat, located within the remote panel, is equipped with a remote sensing bulb and 20 feet of capillary tube. The remote sensing bulb must be installed by the installing personnel. Thermal paste is also provided inside the remote panel and must be used when installing the bulb into the bulb-well. Figure above illustrates the bulbwell dimensions.

piping to avoid vibration transmission.

Insulate all water piping. Use appropriate pipe sealant on all threaded connections.

Final Water Piping Connections

1. Flush all water piping in the system thoroughly before making the final connections.

3/8”

1”

Insulation

Length

3-1/4”

Insertion Length

Temperature Sensor

2-5/8”

Freezestat

A bulbwell (located inside the remote panel) must be installed in the leaving water piping as close to the he att e by assss tth

2. Clean strainer.

3. Connect the water pipe to the EVP chiller.

4. Make sure the 1/2” x 14 NPTE plug is installed.

5. Close the drain shutoff valve.

6. While filling the chiller system with solution, vent the air from the system at the highest points.

60 SS-SVX11K-EN