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Danfoss EPU 2370, Instructions Manual, Page: 46 / 48

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46

VI.72.M4.02 

 Danfoss 11/97

BC-HM

Control principle
PI control of brine temperature (S1).
Brine temperature held constant by

System 6-A - Refrigeration system with constant brine temperature

motor valve control M. Circulation pump
P1 controlled by relay R1.

System 6-B - Refrigeration with constant room temperature

Control principle
PI control of brine temperature (S1) and
P room temperature control (S2). Room
temperature held constant by control of

motor valve M. Circulation pump
controlled by relay R2 and fan P1 by
relay R1.

System types 6-A and 6-B - Refrigeration systems

Summary of Contents for EPU 2370

Page 1: ...Operation 9 10 program time switch and keys position selector function selector Time control 11 12 external time switch override with ESME provisional override to normal temperature External setpoint...

Page 2: ...ybolt under the cover plate Panel mounting in cutout The control can be mounted in a panel with a cutout of 92 x 138 mm max sheet thickness 3 mm Fit four retainer springs on the control before mountin...

Page 3: ...om panel When the control is mounted in a panel cutout the easiest way to remove it is to depress the retainer springs on the rear and press it out of the cutout If there is no access to the rear of t...

Page 4: ...rds the left The spigots will slide out of the hinges The time switch cover can be removed by taking out the two screws Insert the time switch with pins downwards and centre it in the case Then secure...

Page 5: ...y output R2 230 V NC 23 24 8 2 A 250V Connections for sensors etc safety voltage terminals 1 12 Sensor mounting is described in the instructions enclosed with the product Wire cross section min 0 4 mm...

Page 6: ...eral The above wiring diagram shows all connection possibilities for sensors etc In the individual system types the necessary electrical connections are shown with full lines The remaining possibiliti...

Page 7: ...tures can be read off and valve motor and relay outputs can be controlled manually Hot water service system 1 22 29 Control of flow heat exchanger with 1 A and 1 B two and three way valve PI Control o...

Page 8: ...system type number Refit the black cover plate Control operates according to factory set values Note If the factory set values in the control are to be changed see the pages 13 48 or contact Danfoss...

Page 9: ...is registered At the same time an alarm code can be read off in P7 1 See description of alarm codes in section on settings page 21 c Display The display shows diverse temperatures and settings d and e...

Page 10: ...ype of system selected Constant normal temperature The status of relay outputs depends on the type of system selected Manual operation All control functions inactive The control valve motor can be ope...

Page 11: ...elay output R2 Changeover between normal and reduced temperature always follows the zone that controls R1 For position P0 3 see page 15 External time switch External time control is possible via overr...

Page 12: ...ESME ESME must be connected to terminals 4 and 5 It overrides the normal temperature setting on the control in P8 0 The setting range becomes 20 K about the middle temperature setting in P5 3 approx 2...

Page 13: ...the position number e g P2 3 and a value e g 70 C Note In column 0 only values are displayed Changing values 1 Select the required position 2 Press SET once the display flashes 3 Change the value wit...

Page 14: ...4 1 P4 2 P4 3 P4 4 S4 actual S4 return Return limit Warm start Nz return max min amplification delay time neutral zone temperature 20 99 or 0 20 1 899 s 0 9 K 20 99 5 P5 0 P5 3 P5 4 S5 actual S5Mid po...

Page 15: ...system selection page 7 P0 3 Time switch channel selection 0 1 2 3 4 Setting of time switch channels to control relay outputs R1 and R2 Reduced temperature always follows the channel controlling R1 Re...

Page 16: ...the valve closes system without circulation or system with circulation through tank 1 D 1 When storage tank charging is finished the valve continues to control and maintains charging temperature in ci...

Page 17: ...e temperature range in which the length of motor control pulse is proportional to the temperature deviation Outside this range the control pulse is constantly ON With a small proportional band there i...

Page 18: ...rection Positive value reference increased Negative value reference reduced P4 3 Warm start delay time 1 899s Setting of relay R1 delay R1 is delayed at warm start after night set back and at start af...

Page 19: ...perature required at sensor S6 reference temperature for decoupling hot water service charging system when two sensors are used P6 2 System 1 Storage tank temperature differential 0 90 K Setting of di...

Page 20: ...compensation influence on reference temperature see P6 2 The sign of the value indicates increase or reduction of reference temperature on compensation reference increased reference reduced P6 4 Mini...

Page 21: ...emperature that gives base point for compensation II Compensation influences sensor S1 reference see P6 2 The value indicates the temperature at which compensation begins The sign of the value indicat...

Page 22: ...h heat exchanger flow control System 1 B Hot water service system with storage tank flow control Control principle for 1 A and 1 B PI control of hot water service temperature tap temperature at S1 Tem...

Page 23: ...tch Normal 1 time switch Frost 1 1 Control principle for 1 C PI control of temperature at S1 in tap circuit Temperature held constant by motor valve control M in secondary circuit Note The relay statu...

Page 24: ...24 VI 72 M4 02 Danfoss 11 97 BC HM Wiring diagram System types 1 A 1 B and 1 C...

Page 25: ...propor function tional band F OFF F 50 K 3 P3 0 P3 1 P3 4 S3 actual S3 reference Tn integra temperature frost protection tion time temperature F 15 s F 2 C 4 P4 0 P4 1 P4 2 P4 4 S4 actual S4 return l...

Page 26: ...M System types 1 D and 1 E Hot water service systems System 1 D Hot water service system with storage tank charging circulation through tank System 1 E Hot water service system with storage tank charg...

Page 27: ...0 is higher than P8 0 P2 2 two sensors in tank When cutout temperature is reached in the tank valve function depends on the setting in P1 2 P1 2 0 Valve closes but the system is frost protected at 6...

Page 28: ...28 VI 72 M4 02 Danfoss 11 97 BC HM Wiring diagram System types 1 D and 1 E...

Page 29: ...erence Tn integra temperature frost tion time temperature F 15 s F 2 C 4 P4 0 P4 1 P4 2 P4 4 S4 actual S4 return limit Return limit Nz return temp max min amplification neutral zone F 40 C F 4 times F...

Page 30: ...constant room temperature control Control principle PI flow temperature control S1 and P room temperature control S2 Room temperature held constant by motor Control principle PI flow temperature cont...

Page 31: ...has the following influence 0 Control according to reduced setpoint P9 0 Pump constantly cut in 1 Valve closes and pump stops until room temperature falls to the required temperature Valve then opens...

Page 32: ...32 VI 72 M4 02 Danfoss 11 97 BC HM Wiring diagram System types 2 A and 2 B...

Page 33: ...2 P4 4 S4 actual S4 return limit Return limit Nz return max min amplification neutral zone temperature F 40 C F 4 times F 3 K 5 P5 0 P5 3 P5 4 S5 actual S5 scale mid Tmax ext setpoint point for ext fl...

Page 34: ...g frost protection is possible when return sensor S4 is connected When the return temperature is 10 C or less the reference for S1 is increased and thereby the valve opens If it is not possible to rea...

Page 35: ...temperature Water temperature limited to minimum setting Reduced temperature the valve is closed and fan stopped until room temperature has fallen to the required temperature The valve is then opened...

Page 36: ...36 VI 72 M4 02 Danfoss 11 97 BC HM Wiring diagram System type 3...

Page 37: ...begr Return limit Warm start Nz return max min amplification delay time neutral zone temperature F 40 C F 4 times F 180 s F 3 K 5 P5 0 P5 3 P5 4 S5 actual S5 scale mid Tmax flow ext setpoint point for...

Page 38: ...principle PI flow temperature control S1 and P room temperature control S2 Room temperature held constant by motor valve control M Circulation pump controlled by relay R1 System types 4 A and 4 B Floo...

Page 39: ...has the following influence 0 Control according to reduced setpoint P9 0 Pump constantly cut in 1 Valve closes and pump stops until room temperature falls to the required temperature Valve then opens...

Page 40: ...40 VI 72 M4 02 Danfoss 11 97 BC HM Wiring diagram System types 4 A and 4 B...

Page 41: ...me F 2 C F 100 s 4 P4 0 P4 1 P4 2 P4 4 S4 actual S4 return limit Return limit Nz return max min amplification neutral zone temperature F 40 C F 4 times F 2 K 5 P5 0 P5 3 P5 4 S5 actual S5 scale mid Tm...

Page 42: ...ystem 5 B Ventilation system with constant room temperature Control principle PI control of supply air temperature duct temperature S1 and P room temperature control S2 Temperature held constant by mo...

Page 43: ...played in P7 1 and the LED blinks WARNING If no fire thermostat is connected either a jumper short circuit or sensor S6 must be connected to terminals 8 and 9 Warm start function Relay R1 cut in is de...

Page 44: ...ondition Standby 0 1 P1 2 0 1 time switch Reduced P1 2 1 0 time switch Normal 1 time switch Frost 0 1 Wiring diagram System types 5 A and 5 B WARNING If no thermostat is connected either a jumper shor...

Page 45: ...P4 0 P4 1 P4 2 P4 3 P4 4 S4 actual S4 return limit Return limit Warm start Nz return max min amplification delay time neutral zone temperature F 25 C F 4 times F 180 s F 2 K 5 P5 0 P5 3 P5 4 S5 actua...

Page 46: ...ture motor valve control M Circulation pump P1 controlled by relay R1 System 6 B Refrigeration with constant room temperature Control principle PI control of brine temperature S1 and P room temperatur...

Page 47: ...has the following influence 0 Control according to reduced setpoint P9 0 Fan constantly cut in 1 Valve closes and fan stops until the room temperature has risen to the required temperature Valve then...

Page 48: ...P5 0 P5 3 P5 4 S5 actual S5 scale mid Tmax flow ext setpoint point for ext temperature setpoint F 50 C F 0 C 6 P6 0 P6 2 P6 3 P6 4 S6 actual Compensation Compensation Tmin flow compensation base poin...

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