Danfoss FJV Data sheet

Data sheet

Return temperature limiter FJV (PN 16)

Description

FJV is self-acting temperature controller used to control:

-return water temperature from hot water tanks in direct connected district heating systems

-return water temperature in district heating systems with mixing loop.

The FJV ensures that return water is cooled to required temperature before it flows back to the district heating plant. Controller closes on rising temperature.

The controller has a control valve, thermostatic actuator and handle for temperature setting. Thermostatic actuator consist of a bellows only.

For block and district heating systems.

Main data:

•DN 15, 20, 25

•kVS 1,9; 3,4; 5,5 m3/h

•PN 16

•Setting range: 20 … 60 °C

•Temperature:

-Circulation water / glycolic water up to 30 %: 2 … 130 °C

•Connections:

-Int. thread

-Ext. thread (weld-on and ext. thread tailpieces)

Ordering

Example:

Return temperature limiter; DN 15; kVS 1,9; PN 16; setting range 20…60°C; Tmax 130°C; ext. thread

- 1× FJV DN 15 controller Code No: 003N5117

Option:

- 1× Weld-on taipieces Code No: 003H6908

FJV Controller

			Setting range	kVS	Internal thread		External thread
	Picture	DN
					Connection		Connection
			(°C)	(m3/h)		Code No.		Code No.
					ISO 7/1		ISO 228/1
		15		1,9	Rp ½	003N2250	G ¾ A	003N5117
		20	20 … 60	3,4	Rp ¾	003N3250	G 1 A	003N5118
		25		5,5	Rp 1	003N4250	G 1¼ A	003N5119

Accessories

Picture	Type designation	DN		Code No.
		15		003H6908
	Weld-on taipieces	20		003H6909
		25		003H6910
		15	R ½”	003H6902
	External thread taipieces	20	R ¾”	003H6903
		25	R 1”	003H6904

Service kits

Picture	Type designation	for	Code No.
	Repair set	DN 15	003N4006
			003N4007
	Two diaphragms, two O-rings, one rubber cone, one tube of grease and eight	DN 20
	valve cover screws
		DN 25	003N4008
	Thermostatic actuator 20 … 60 °C		003N0084

DEN-SMT/SI

VD.54.H5.02 © Danfoss 03/2015

1

Data sheet	Return temperature limiter FJV (PN 16)

Technical data

Nominal diameter			DN	15		20		25
kVS value			m3/h	1,9		3,4		5,5
Nominal pressure			PN		16
Max. differential pressure			bar		10
Medium					Circulation water / glycolic water up to 30 %
Medium pH						Min. 7, max. 10
Medium temperature			oC			-25 … +130
Materials
Valve body	internal thread			MS 58, hot-pressed, DIN 17660, W.No. 2.0401, CuZn40Pb3
	external thread			Dezincing-free brass, BS 2872/CZ132
Valve seat				Cr Ni steel, DIN 17440, W.No. 1.4301
Valve cone				NBR-rubber
Spindle				Dezincing-free brass, BS 2874/CZ132
Diaphragms, O-rings				EPDM-rubber

Application principle

FJV

FJV

Installation positions		1.	FJV must be installed immediately
			behind the hot water tank.
		2.	If central control of return water temperature
			is required (in district heating systems with
			mixing loop), FJV must be positioned so that
			return water temperature from hot water tank
			does not affect the element.
		The controller must be installed in return
		line section. It is recommended that a strainer
		be inserted in the system inlet line, as shown
		under “Application principle” . It can be installed
		in any position, with flow in the direction of the
		cast-in arrow.
		FJV must not be insulated as this would affect
		the valve control capability – must be allowed to
		give off heat.
		Installation and service are described in detail
	Temperature controller	in the instructions, which is supplied with the
		controller. Separate instructions are available.
2	VD.54.H5.02 © Danfoss 03/2015		DEN-SMT/SI