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

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Hot gas bypass regulator, types TUH, TCHE and TGHE

Functions

Figure 1: TUH, Angleway

2
3	1
4
Danfoss
68U127

Figure 2: TCHE, Angleway

2
3	1
4
Danfoss
68U128

1	Bulb with capillary tube		3	Setting spindle for adjustment of opening point/
				minimum suction pressure
2	Diaphragm element
			4	Fixed ori‚ce

Figure 3: TGHE 10, Straightway

1
2
3
4
5
6
7
8	Danfoss
	67N47.10

Figure 4: TGHE 20, TGHE 40 Straightway

1

2

3

4

5

6

7

8

Danfoss 067N8633

1	Bulb with capillary tube		5	Two-way balance port
2	Thrust pad		6	Valve body
3	Diaphragm element		7	Setting spindle
4	Push pin seal		8	Protective cap

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.

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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).

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<![endif]>Danfoss

	4
1
a	EVR
	SGP
5
	DML
TCHE / TGHE
b	3
	2
6

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<![endif]>R64-1894.10

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	4
1
a	EVR
	SGP
5
	DML
TCHE / TGHE
b	3
	2
6

1	Evaporator		4	Solenoid valve
2	Condenser		5	Discharge bypass valve with adjustable setting
3	Receiver		6	Compressor

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Hot gas bypass regulator, types TUH, TCHE and TGHE

	EVR	SGP	DML
	TGE
	LD
			TCHE / TGHE
<![if ! IE]> <![endif]>Danfoss	<![if ! IE]> <![endif]>R64-3028.10
1	Evaporator	4	Solenoid valve
2	Condenser	5	Discharge bypass valve with adjustable setting
3	Receiver	6	Compressor

Sizing

Figure 5: Sizing example for R134a

	6							<![if ! IE]> <![endif]>Danfoss R64-1988E	TCHE 4
<![if ! IE]> <![endif]>[kW]	5								TCHE 3
									TUH 9
<![if ! IE]> <![endif]>capacity	4
	3
<![if ! IE]> <![endif]>Replacement	2
	1
	0
	-6	-5	-4 -3 -2	-1	0	1	2	3
			Evaporating temperature [°C]
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

	Refrigerant		Condensing temperature
	R134a	+30°C	+40°C	+50°C
		0.8	1.0	1.2

Example

Refrigerant: R134

Compressor capacity: 6 kW at +2 /+50 °C

Min. load 50%: 3 kW

Replacement capacity: 6 – 3 = 3 kW

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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.

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Hot gas bypass regulator, types TUH, TCHE and TGHE

Media

Table 2: Refrigerants features

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
	R134a, R22, R407C, R404A	34 bar / MWP = 500 psig
Max. permissible working pressure (PS)	R410A	TCHE	45.5 bar / 660 psig
		TGHE	49 bar / 710 psig
	R134a, R22, R407C, R404A	37.5 bar / 540 psig
Max. test pressure	R410A	TCHE	50 bar / 725 psig
		TGHE	54 bar / 755 psig
P-band max.	0.5 bar / 7.3 psig

Table 3: Adjustment range for start opening

	Valve type	Orifice sizes	Refrigerant	Adjustment range for start opening
				[°C]	[°F]
			R134a	-1 - 10	+30	- +50
				-6 - +5	+21	- +41
	TUH	9	R22/R407C	-4 - +8	+25	- +46
				-1 - +12	+30	- +54
			R404A/R507
				-42 - -32	-44	- -26
			R410A	-1 - +10	+30	- +50
			R134a	-1 - 12	+30	- +54
				-5 - +5	+23	- +41
			R22/R407C	0 - +8	+32	- +46
	TCHE	3 and 4	R407C	-1 - +8	+30	- +46
			R404A/R507	0 - +6	+32	- +43
			R410A	-1 - +9	+30	- +48
				-5 - +5	+23	- +41
			R134a	-1 - 12	+30	- +54
			R22/R407C	-1 - +10	+30	- +50
	TGHE 10	10	R407C	-1 - +10	+30	- +50
			R404A/R507	-1 - +8	+30	- +46
			R410A	-1 - 12	+30	- +54
			R134a	-1 - +13	+30	- +55
			R22/R407C	-1 - +7	+30	- +45
	TGHE 20	20	R407C	-1 - +7	+30	- +45
			R404A/R507	-1 - +7	+30	- +45
			R410A	-1 - +7	+30	- +45
			R134a	-1 - +16	+30	- +61
	TGHE 40	40	R407C	-1 - +10	+30	- +50
			R404A/R507	-1 - +8	+30	- +46
			R410A	-1 - +8	+30	- +46

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Hot gas bypass regulator, types TUH, TCHE and TGHE

Product speci€cation

Replacement capacity and Mass flow

Replacement capacity - R134a

Figure 6: TUH & TCHE - R134a
	6							<![if ! IE]> <![endif]>Danfoss R64-1989E
<![if ! IE]> <![endif]>[kW]	5
<![if ! IE]> <![endif]>capacity	4
	3
<![if ! IE]> <![endif]>Replacement	2
	1
	0
	-6	-5	-4 -3 -2	-1	0	1	2	3
			Evaporating temperature [°C]
Figure 7: TGHE - R134a

TCHE 4

TCHE 3

TUH 9

	25					<![if ! IE]> <![endif]>Danfoss R64-1990E	TGHE 40
<![if ! IE]> <![endif]>[kW]	20						TGHE 20
							TGHE 10
<![if ! IE]> <![endif]>capacity
	15
<![if ! IE]> <![endif]>Replacement	10
	5
	0
	-20	-15	-10	-5	0	3
		Evaporating temperature [°C]
Conditions used in calculation: tc = +40°C, Start opening te = +2°C

Table 4: Correction factor for condensing temperature

	Refrigerant		Condensing temperature
	R134a	+30°C	+40°C	+50°C
		0.8	1.0	1.2

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

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