Danfoss TR6 Data sheet

Data Sheet

Thermostatic Expansion Valves

Type TR6

The TR6 series is a hermetic design which is developed with features especially for use in applications such as:

• Residential air conditioning systems

• Split systems

• Roof top units

• Heat pumps

• Chillers

• Light commercial air conditioning systems

The TR6 design incorporates a forged brass body with the entire power element, including the capillary tube and bulb, fabricated from stainless steel. All valves are designed with balanced port which reduces the influence from varying condensing pressures. The valves can be delivered with special connections and fittings both at the inlet, outlet, and the equalizer connection.

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Thermostatic Expansion Valves, Type TR6

Features

•Compact size - hermetic design, straightway configuration with external equalization

•Refrigerants & rated capacities ranging up to

◦R22/R407C: 23.6 kW / 6.7 TR

◦R410A: 24.5 kW / 7 TR

•Laser-welded power element

◦Longer diaphragm life

◦High corrosion resistant

•Stainless steel capillary tube

◦Tolerates more bending for easier installation and longer life

◦High strength and vibration resistance

•Stainless steel bulb

◦Self aligning

•Balance port design

•A complete program with and without internal check valve

•Internal check valve design with low pressure drop in reverse flow

•Adjustable or non-adjustable superheat, for customer specific factory setting

•Bleed function available

•Solder, chatleff and aeroquip connections

•With external equalization

•UL listed, file SA7200

•Anti-hunt bulb charge

© Danfoss | Climate Solutions | 2021.02

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Thermostatic Expansion Valves, Type TR6

Application

Traditional air conditioning system, cooling only

Figure 1: Traditional air conditioning system, cooling only

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A
	D
B	C
	E

ATR6 with / without internal check valve

BRD Distributor

CCompressor

DOutdoor coil

EDCL/DML

Illustrates the diagram of a traditional air conditioning system where the TR6 is controlling liquid injection in one direction only.

Traditional air conditioning / heat pump system

Figure 2: Traditional air conditioning / heat pump system

B		H
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A
	E	G
C
		F

ARD Distributor

BIndoor coil

CTR6 with internal check valve

D4-way valve

ECompressor

FDCB/DMB

GTR6 with internal check valve

HOutdoor coil

Illustrates a split air conditioning / heat pump system with two thermostatic expansion valves, one for cooling mode and one for heating mode. The thermostatic expansion valves each has a built-in check valve, which has the function of preventing flow in one direction and allowing the flow in the opposite direction. It means that one thermostatic expansion valve is controlling liquid injection into the indoor coil while the other thermostatic expansion valve is bypassing the metering device with the open check valve.

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Thermostatic Expansion Valves, Type TR6

Simplified air conditioning / heat pump system (bi-flow)

Figure 3: Simplified air conditioning / heat pump system (bi-flow)

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	B		B	Indoor coil
	D		C	TR6 without check valve
	F		D	4-way valve
	A		E	Compressor
			F	Outdoor coil
	E
	C

Illustrates a packaged air conditioning / heat pump system with a short distance between the indoor and outdoor heat-exchangers. The two TR6 valves from fig 6 can be replace by one TR6 valve without internal check valve, making use of the bi-flow feature of this thermostatic expansion valve. The single valve is controlling the liquid injection in both directions. The normal flow direction marked with an arrow on the valve body should be used for the primary function, i.e. cooling or heating.

© Danfoss | Climate Solutions | 2021.02

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