Temperature controller (PN 25) AVT / VG - external thread AVT / VGF - flange

Transcription

1 Data sheet Temperature controller (PN 25) AVT / VG - external thread AVT / VGF - flange Description AVT / VG The AVT / VG(F) controller is a self-acting proportional temperature controller developed primarily for domestic hot water (DHW) production: - Hot water tanks - Storage charge systems - Instantaneous domestic hot water production It can be used in mixing loops and room heating systems as well. Controller closes on rising temperature. AVT / VGF The temperature controller is type-tested according to EN and can be used in combinations with safety temperature monitors STM and safety temperature limiters STL. Flow and return mounting. Main data: DN k vs m 3 /h PN 25 Setting ranges: C / C / C / C and C / C / C / C Temperature: - Circ. water / glycolic water up to 30%: C Connections: - Ext. thread (weld-on, thread and flange tailpieces) - Flange Ordering Example: Temperature controller, DN 15, k vs 1.6, PN 25, setting range C, t max 150 C, ext. thread - 1x VG DN 15 valve Code No: 065B0772-1x AVT thermostat, C Code No: Option: - 1x Weld-on tailpieces Code No: 003H6908 VG, VGF valve Picture DN k vs t PN max. (mm) (m 3 /h) ( C) Connection Code No B B G ¾ A 065B B Cylindrical external 065B0774 thread acc. to ISO 228/1 G 1 A 065B G 1¼ A 065B G 1¾ A 065B G 2 A 065B G 2½ A 065B B B B0782 Flanges PN 25, acc. to EN B B B0785 DH-SMT/SI VD.JK.A2.02 Danfoss 02/2011 1

2 Ordering (continuous) AVT thermostat Picture For valves Setting range Temperature sensor with brass immersion pocket, length, connection Code No C DN C mm, R ½ C 1) C C DN C mm, R ¾ C 1) C C DN C mm, R ¾ 1) 2) C C ) conic male thread EN ) without immersion pocket Accessories for valves Picture Type designation DN Connection Code No H H6909 Weld-on tailpieces H H H H R ½ 003H6902 External thread tailpieces 20 Conical ext. thread acc. to R ¾ 003H EN R 1 003H R 1¼ 003H H6915 Flange tailpieces 20 Flanges PN 25, acc. to EN H H6917 Accessories for thermostats Picture Type designation For valves Material Code No. Immersion pocket DN Brass * Stainless steel, mat. No * DN Brass * Stainless steel, mat. No * Combination piece K2 003H6855 Combination piece K3 003H6856 * Not for AVT thermostat code numbers: , , , Service kits Picture Type designation DN (mm) k vs (m 3 /h) Code No H H H6871 Valve insert H H H H / 40 / / 16 / 20 / H6876 for sensors Sensor stuffing box set AVT R ½ AVT R ¾ VD.JK.A2.02 Danfoss 02/2011 DH-SMT/SI

3 Technical data Valves Nominal diameter DN k vs value m 3 /h /20 1) 20/25 1) Cavitation factor z * 0.6 Leakage acc. to standard IEC Nominal pressure PN 25 Max. differential pressure bar Medium Circulation water / glycolic water up to 30% Medium ph Min. 7, max. 10 Medium temperature C valve Thread and flange Connections Weld-on and flange Weld-on tailpieces External thread - Materials Ductile iron Valve body thread Red bronze CuSn5ZnPb (Rg5) EN-GJS LT (GGG 40.3) flange Ductile iron EN-GJS LT (GGG 40.3) Valve seat Stainless steel, mat. No Valve cone Dezincing free brass CuZn36Pb2As Sealing EPDM * k v /k vs 0.5 at DN 25 and higher 1) Flange valve body Thermostat Setting range X s C C / C / C / C C / C / C / C Time constant T acc. to EN s max. 50 (170 mm, 210 mm), max. 30 (255 mm) Gain K s mm/ K 0.2 (170 mm), 0.3 (210 mm), 0.7 (255 mm) Max. adm. temperature at sensor 50 C above maximum setpoint Perm. amb. temperature at sensor 0 70 C Nominal pressure sensor PN 25 Capillary tube length 5 m (170 mm, 210 mm), 4 m (255 mm) Material Temperature sensor Cooper / Brass Ms design Brass, nickel-plated Immersion pocket * Stainless steel design Mat. No (170 mm), mat. No (210 mm) Handle for temp. setting Polyamide, glass fiber-reinforced Scale carrier Polyamide * for sensor 170 and 210 mm Application principles DH-SMT/SI VD.JK.A2.02 Danfoss 02/2011 3

4 Combinations Example: Temperature controller with safety temperature monitor, DN 15, k vs 1.6, PN 25, setting range C, t max 150 C, ext. thread - 1x VG DN 15 valve Code No: 065B0772-1x AVT thermostat, C Code No: x STM thermostat, C Code No: AVT / AVT / VG - two temperature controllers - 1x K2 combination piece Code No: 003H6855 Note: For safety temperature monitor STM / VG(F) and safety temperature limiter STLV see relevant data sheet. STM / AVT / VG - temperature controller with safety temperature monitor STM / AVT / AVT /VG - two temperature controllers with safety temperature monitor STLV / AVT - temperature controller with safety temperature limiter STLV / AVT / AVT - two temperature controllers with safety temperature limiter Installation positions Temperature controller Temperature controller AVT / VG(F) can be installed in any position. 4 VD.JK.A2.02 Danfoss 02/2011 DH-SMT/SI

5 Installation positions (continuous) Temperature sensor The place of installation must be chosen in a way that the temperature of the medium is directly taken without any delay. Avoid overheating of temperature sensor. The temperature sensor must be immersed into the medium in its full length. Temperature sensors 170 mm R½ and 210 mm R¾ - The temperature sensor may be installed in any position. Temperature sensor 255 mm R¾ - The temperature sensor must be installed as shown on the picture. Pressure temperature diagram working area EN-GJS LT (GGG 40.3) PN 25 CuSn5ZnPb (Rg5) PN 25 Maximum allowed operating pressure as a function of medium temperature (according to EN and EN ). DH-SMT/SI VD.JK.A2.02 Danfoss 02/2011 5

6 Valve sizing Given data: P max = 14 kw t = 20 K p v = 0.15 bar P max - heating power (kw) t -temperature difference (K) p v - differential pressure across the valve Maximum flow Q max (m 3 /h) through the valve is calculated according to formula: Pmax Qmax = = t 20 Q max = 0.6 m 3 /h k v value is calculated according to formula: Q k max v = = pv k v = 1.5 m 3 /h Chosen k vs = 1.6 m 3 /h or read from the sizing diagram by taking a line through Q scale (0.6 m 3 /h) and p v scale (0.15 bar) to intersect k v -scale at 1.5 m 3 /h Chosen k vs = 1.6 m 3 /h Solution: The example selects 1) ext. thread valve VG DN 15, k vs value 1.6 or 2) flange valve VGF DN 15, k vs value VD.JK.A2.02 Danfoss 02/2011 DH-SMT/SI

7 Design 1. Valve VG(F) 2. Valve insert 3. Pressure relieved valve cone 4. Valve stem 5. Union nut 6. Thermostat AVT 7. Thermostat stem 8. Bellows 9. Setting spring for temperature control 10. Handle for temperature setting, prepared for sealing 11. Scale carrier 12. Capillary tube 13. Flexible protected pipe (only at AVT 255 mm) 14. Temperature sensor 15. Immersion pocket 13 Function Medium temperature changes cause pressure changes in temperature sensor. Resulting pressure is being transferred through the capillary tube to the bellows. Bellows moves thermostat stem and opens or closes valve cone. By increasing of medium temperature valve cone moves towards the seat (valve closes), by decreasing of medium temperature valve cone moves away from the seat (valve opens). Handle for temperature setting can be sealed. Settings Temperature setting Temperature setting is being done by the adjustment of the setting spring for temperatature control. Dimensions DN SW 32 (G ¾A) 41 (G 1A) 50 (G 1¼A) 63 (G 1¾A) 70 (G 2A) 82 (G 2½A) d R 1) ½ ¾ 1 1 ¼ - - L1 2) L2 mm L k d n ) Conical ext. thread acc. to EN ) Flanges PN 25, acc. to EN DH-SMT/SI VD.JK.A2.02 Danfoss 02/2011 7

8 Dimensions (continuous) DN L L H mm H H H Weight (valves) Weight (thermostat) thread flange sensor 170 mm sensor 210 mm sensor 255 mm Note: other flange dimensions - see table for tailpieces 1.3 kg 1.5 kg 1.6 kg 8 VD.JK.A2.02 Produced by Danfoss A/S 02/2011