Danfoss TUH, TCHE, TGHE, TGHE 10, TGHE 20 Data sheet

Data Sheet

Hot gas bypass regulator Types TUH, TCHE and TGHE

Capacity regulator

TUH, TCHE and TGHE capacity regulators adapt compressor capacity to actual evaporator load in applications operating at an evaporating temperature of around 0°C.

TUH, TCHE and TGHE valves are typically used in applications such as:

• Air driers

• Water chillers

Fitted in a bypass between the high and lowpressure sides of the air-drier system, TUH, TCHE and TGHE maintain compressor suction pressure by injecting hot gas/cool gas from the high-pressure side.

TUH has internal pressure equalisation and opens when pressure drops at the valve outlet. TCHE and TGHE have external pressure equalisation and open directly when compressor suction pressure drops.

For all types, the bulb only serves as a reservoir for the charge. However, it is recommended that the bulb be mounted in a location where temperature variation during operation is limited.

AI000086422949en-000401

Hot gas bypass regulator, types TUH, TCHE and TGHE

Features

• Bimetal connections for TUH and TCHE. ◦ Straightforward and fast soldering (no wet cloth or refrigeration pliers required)

• Replacement capacities up to 28.9 kW (8.3 TR) for R410A

• Stable regulation

• Tight across the seat

• Compact design. ◦ Small dimensions and low weight

• Hermetically tight design

• Stainless steel, hermetically tight solder version

◦ high connection strength ◦ high corrosion resistance ◦ capillary tube joints of high strength and vibration resistance

• Laser-welded, stainless steel diaphragm element

◦ optimum function ◦ long diaphragm life ◦ high pressure resistance

• Adjustable setting

◦ accurate setting ◦ ne tuning possible

• Low p-band

• Low hysteresis

Danfoss 68U127

1

2

3

4

Danfoss 68U128

1

2

3

4

Danfoss 67N47.10

1

2 3

4

7

8

5

6

Danfoss 067N8633

1

2 3

4

5

7

8

6

1

23412345678

Bulb with capillary tube

Diaphragm element

Setting spindle for adjustment of opening point/

minimum suction pressure

Fixed orice

Bulb with capillary tube

Thrust pad

Diaphragm element

Push pin seal

Two-way balance port

Valve body

Setting spindle

Protective cap

Hot gas bypass regulator, types TUH, TCHE and TGHE

Functions

Figure 1: TUH, Angleway

Figure 3: TGHE 10, Straightway

Figure 2: TCHE, Angleway

Figure 4: TGHE 20, TGHE 40 Straightway

The valve is set to start opening at an evaporating temperature of +2°C/+36°F. The setting can be changed by turning the setting spindle. The temperature at which the valve starts opening is increased by turning the spindle anti-clockwise and decreased by turning the spindle clockwise.

Specically designed for hot gas applications.

All valves react only on to suction pressure variation.

12345

6

Danfoss

R64-1893.10

EVR

4

1

6

DML

SGP

5

TCHE / TGHE

a

b

2

3

Danfoss

R64-1894.10

EVR

4

1

6

DML

SGP

5

TCHE / TGHE

a

b

2

3

Evaporator

Condenser

Receiver

Solenoid valve

Discharge bypass valve with adjustable setting

Compressor

Hot gas bypass regulator, types TUH, TCHE and TGHE

Applications

 NOTE:

The bulb serves only as a reservoir for the charge, however, it is recommended to mount it in a position where the temperature variation during running conditions is limited (see a and b in the drawings below).

Evaporating temperature [°C]

Danfoss

R64-1988E

Replacement capacity [kW]

6

5

4

3

2

1

0

-6 -5 -4 -3 -2 -1 0 1 2 3

TCHE 4

TCHE 3

TUH 9

12345

6

EVR

TGE

TCHE / TGHE

DML

SGP

LD

Danfoss

R64-3028.10

Evaporator

Condenser

Receiver

Solenoid valve

Discharge bypass valve with adjustable setting

Compressor

Refrigerant

Condensing temperature

R134a +30°C

+40°C

+50°C

0.8

1.0

1.2

Hot gas bypass regulator, types TUH, TCHE and TGHE

Sizing

Figure 5: Sizing example for R134a

Conditions used in calculation: tc = +40°C, Start opening te = +2°C

Correction for condensing temperature

The corrected replacement capacity can be obtained by dividing the replacement capacity with the correction factor given below.

Table 1: Correction factor for condensing temperature

Example

Refrigerant: R134 Compressor capacity: 6 kW at +2 /+50 °C Min. load 50%: 3 kW Replacement capacity: 6 – 3 = 3 kW

Hot gas bypass regulator, types TUH, TCHE and TGHE

Min. evaporating temperature te: -1.0 °C Condensing temperature tc: +50 °C Correction factor (table): 1.2

The corrected replacement capacity thus becomes 3 kW divided by 1.2 = 2.5 kW. The TCHE 4 gives 2.7 kW at

-1.0/+40°C (....) and gives 2.5 kW at -0.8/+40°C (- -). Thus the TCHE 4 would be a suitable choice.

Features

Description

Standard models

One standard range per refrigerant

Refrigerants

R134a, R404A/R507, R407C, R22, R410A

Max. valve body temperature 120 °C / 248 °F

Transient peak

150 °C / 302 °F

Max. permissible working pressure (PS)

R134a, R22, R407C, R404A

34 bar / MWP = 500 psig

R410A TCHE

45.5 bar / 660 psig

TGHE

49 bar / 710 psig

Max. test pressure

R134a, R22, R407C, R404A

37.5 bar / 540 psig

R410A TCHE

50 bar / 725 psig

TGHE

54 bar / 755 psig

P-band max.

0.5 bar / 7.3 psig

Valve type

Orice sizes

Refrigerant

Adjustment range for start opening

[°C]

[°F]

TUH

9

R134a

-1 - 10

+30 - +50

-6 - +5

+21 - +41

R22/R407C

-4 - +8

+25 - +46

R404A/R507

-1 - +12

+30 - +54

-42 - -32

-44 - -26

R410A

-1 - +10

+30 - +50

TCHE

3 and 4

R134a

-1 - 12

+30 - +54

-5 - +5

+23 - +41

R22/R407C

0 - +8

+32 - +46

R407C

-1 - +8

+30 - +46

R404A/R507

0 - +6

+32 - +43

R410A

-1 - +9

+30 - +48

-5 - +5

+23 - +41

TGHE 10

10

R134a

-1 - 12

+30 - +54

R22/R407C

-1 - +10

+30 - +50

R407C

-1 - +10

+30 - +50

R404A/R507

-1 - +8

+30 - +46

R410A

-1 - 12

+30 - +54

TGHE 20

20

R134a

-1 - +13

+30 - +55

R22/R407C

-1 - +7

+30 - +45

R407C

-1 - +7

+30 - +45

R404A/R507

-1 - +7

+30 - +45

R410A

-1 - +7

+30 - +45

TGHE 40

40

R134a

-1 - +16

+30 - +61

R407C

-1 - +10

+30 - +50

R404A/R507

-1 - +8

+30 - +46

R410A

-1 - +8

+30 - +46

Hot gas bypass regulator, types TUH, TCHE and TGHE

Media

Table 2: Refrigerants features

Table 3: Adjustment range for start opening

Evaporating temperature [°C]

Danfoss

R64-1989E

Replacement capacity [kW]

6

5

4

3

2

1

0

-6 -5 -4 -3 -2 -1 0 1 2 3

TCHE 4

TCHE 3

TUH 9

Evaporating temperature [°C]

Replacement capacity [kW]

10

15

20

25

5

0

-20 -15 -10

-5

0 3

Danfoss

R64-1990E

TGHE 40

TGHE 20

TGHE 10

Refrigerant

Condensing temperature

R134a +30°C

+40°C

+50°C

0.8

1.0

1.2

Hot gas bypass regulator, types TUH, TCHE and TGHE

Product specication

Replacement capacity and Mass ow

Replacement capacity - R134a

Figure 6: TUH & TCHE - R134a

Figure 7: TGHE - R134a

Conditions used in calculation: tc = +40°C, Start opening te = +2°C

Table 4: Correction factor for condensing temperature

The correction factor can either be multiplied with the valve capacity or the replacement capacity can be divided with the correction factor.