Danfoss EPU 2350/2354 Operating instructions

Brand: Danfoss

Model: EPU 2350/2354

Type: Operating instructions

BC-HM VI.72.J3.02 © Danfoss 9/97 1

Instruction

EPU 2350 and EPU 2354

Contents

System examples...........................2 - 6

Wiring diagrams.............................7 - 8

Wiring ................................................... 9

Temperature sensor connections ... 10

Master/slave units.............................10

Frost protection ................................11

Time control ......................................11

Controller settings .....................12 - 15

User settings .......................................

- a) Program time switch

- b) Temperature setting

- c) Function swtich

- d) Indications

Installer settings...........................

13 - 16

- f) Reduced temperature

- g) Integration time

- h) Proportional band

- i) Temperature difference

- j) Return temperature limiter

- k) Mini switches

Controller and sensor test ............... 16

Manual valve control ........................16

Mounting .....................................17 - 20

- Wall mounting

- Board or panel mounting

- DIN-rail mounting

- Several controls side by side

- Dismounting

- Time switch mounting

- Time switch replacement

087R9472

2 VI.72.J3.02 © Danfoss 9/97 BC-HM

System example 1

System description

Hot-water-service system with primary

flow heat exchanger control and

secondary hot-water-service circulation.

Function

Valve controls primary flow to keep tap

temperature S1 constant.

At return temperature sensor control S4

reference temperature S1 is limited to

set value.

At time control tap temperature S1 can

be reduced and circulation pump P1 is

stopped.

Note

Circulation pump P1 is to be stopped

only if temperature sensor S1 is

mounted right in the heat exchanger (if

not, there might be risk of breaking the

control loop, which again will result in

heat loss)

WiringWiring

Wiring

See wiring diagram, example 1 for EPU

2350 - 230 V or example 3 for EPU 2354

- 24 V.

SettingsSettings

Settings

Tap temperature can be set on button b)

BC-HM VI.72.J3.02 © Danfoss 9/97 3

System example 2System example 2

System example 2

System descriptionSystem description

System description

Hot-water-service system with primary

temperature heat exchanger control and

secondary hot-water-service circulation.

FunctionFunction

Function

Mixing valve controls primary flow to

keep tap temperature S1 constant.

At return temperature sensor control S4

reference temperature S1 is limited to

set value.

At time control tap temperature S1 can

be reduced and circulation pump P1 is

stopped.

Note

Circulation pump P1 is to be stopped

only if temperature sensor S1 is

mounted right in the heat exchanger (if

not, there might be risk of breaking the

control loop, which again will result in

heat loss)

WiringWiring

Wiring

See wiring diagram example 1 for EPU

2350 - 230 V or example 3 for EPU 2354

- 24 V.

SettingsSettings

Settings

Tap temperature can be set on button b)

4 VI.72.J3.02 © Danfoss 9/97 BC-HM

System example 3

System description

Hot-water-service system with

secondary temperature cylinder control

and secondary hot-water-service

circulation.

Function

Hot-water cylinder temperature is

maintained at system temperature level.

Mixing valve mixes cold and hot water to

keep tap temperature constant.

At time control tap temperature S1 can

be reduced and circulation pump P1 is

stopped.

BC-HM VI.72.J3.02 © Danfoss 9/97 5

System example 4

System description

Hot-water-service system with primary

temperature cylinder control and

secondary hot-water-service circulation.

Function

Cylinder heating coil is connected direct

to district heating system. The valve

controls primary flow in dependence of

hot-water cylinder temperature S1.

Return temperature sensor S4 keeps

return temperature from exceeding a set

limit.

At time control tap temperature S1 can

be reduced and circulation pump P1 is

stopped.

Wiring

See wiring diagram, example 1 for EPU

2350 - 230 V or example 3 for EPU 2354

- 24 V.

Settings

Cylinder temperature can be set on

button b). Return temperature limitation

is to be set as low as possible

considering heating time.

6 VI.72.J3.02 © Danfoss 9/97 BC-HM

System example 5System example 5

System example 5

System descriptionSystem description

System description

Hot-water-service system with primary

flow heat exchanger control, charging

circuit cylinder control with one or two

sensors and secondary side hot-water-

service circulation.

FunctionFunction

Function

Heat exchanger is connected direct to

district heating system and primary

control valve controls charging circuit

temperature (S1). Hot-water cylinder has

one (S2) or two (S2 and S2*) sensors.

Pump (P2) in charge circuit is cut-in

when cylinder temperature S2 (top

sensor) is lower than cut-in temperature

and stopped when reaching cut-out

temperature S2* (bottom sensor).

At return temperature sensor control S4

reference temperature S1 is limited to

set value.

At time control tap temperature S1 can

be lowered and circulation pump P1 is

stopped.

Note

Circulation pump P1 is to be stopped only

if temperature sensor S1 is mounted

right in the heat exchanger (if not, there

might be risk of breaking the control

loop, which again will result in heat loss)

WiringWiring

Wiring

See wiring diagram, example 2 for

EPU 2350 - 230 V or example 4 for

EPU 2354 - 24 V.

SettingsSettings

Settings

- Charge temperature S1 is set on

temperature button.

- Cut-in temperature S2 = S1 − (setting

DI L 4) − ∆ T potentiometer j.)

Cut-out temperature S2* = S1 −

(setting DIL 4)

Note:

At hot-water service flow through heat

exchanger, mini-switch 5 must be set in

position ON (control) to maintain charge

temperature in circulation pipe during

pump P2 standby.

BC-HM VI.72.J3.02 © Danfoss 9/97 7

Wiring diagramsWiring diagrams

Wiring diagrams

Wiring diagram 2) for EPU 2350 (230 V)

Wiring diagram 1) for EPU 2350 (230 V)

8 VI.72.J3.02 © Danfoss 9/97 BC-HM

Wiring diagrams

Wiring diagram 3) for EPU 2354 (24 V)

Wiring diagram 4) for EPU 2354 (24 V)

BC-HM VI.72.J3.02 © Danfoss 9/97 9

Wiring

Terminal strips

Terminal strips with screw fastening wire

the controller.

Each terminal can wire up to 3 × 1.5

or the like. The terminals are

encoded, so units with supply voltage

cannot be wired in the safety voltage part.

Wiring EPU 2350 - 230 V a.c.

Connections with supply voltage - (terminals 13 - 24)

Terminal Load

Zero (N) - 230 V a.c. 13

Phase (L) - 230 V a.c. 14

16 (close) 8 (2) A 250 V a.c.

Reversible gear motor 230 V a.c. - AMB, AMV

17 (open) 8 (2) A 250 V a.c.

Relay outlet 230 V a.c.- NC (R1) 21 - 22 8 (2) A 250 V a.c.

Relay outlet 230 V a.c. - NC (R2) 23 - 24 8 (2) A 250 V a.c.

Wiring EPU 2354 - 24 V a.c.

Connections with supply voltage - (terminals 13 - 24)

Terminal Load

Zero (N) - 24 V a.c. 13

Phase (L) - 24 V a.c. 14

16 (close) 8 (2) A 24 V a.c.

Reversible gear motor 24 V a.c.- AMB, AMV

17 (open) 8 (2) A 24 V a.c.

Relay outlet 24 V a.c.- NC (R1) 21 - 22 8 (2) A 24 V a.c.

Relay outlet 24 V a.c.- NC (R2) 23 - 24 8 (2) A 24 V a.c.

10 VI.72.J3.02 © Danfoss 9/97 BC-HM

Temperature sensor connection, etc. - safety voltage (terminals 1 - 12)Temperature sensor connection, etc. - safety voltage (terminals 1 - 12)

Temperature sensor connection, etc. - safety voltage (terminals 1 - 12)

Sensor and remote unit mounting is described in instructions, which are delivered

together with the products.

Type Terminal

Temperature sensor - flow (S1) ESMU 10 - 11

Cylinder temperature sensor (S2)

ESMU 7 - 9

- top sensor in hot water cylinder

Cylinder temperature sensor (S2*)

ESMU 8 - 9

- bottom sensor in hot water cylinder

Temperature sensor - return (S4) ESMA/C/U 4 - 6

Temperature sensor - frost protection (S3) ESMA/C/T 11 - 12

Set point remote setting (S5) – 4 - 5

External time switch signal connection ECA 9010 3 - 4

BUS for communication 1 - 2

Wire cross section: min 0.4 mm

Total length of all sensor and BUS

wires. Max. 150 meter.

Note!

The measure result might deviate due to

wire resistance. A resistance of 4 Ohm

corresponds to a deviation of about 1 K.

BC-HM VI.72.J3.02 © Danfoss 9/97 11

Master/slave units

EPU 2350 can be coupled via BUS with

other EPU or ECL controls

Address 15 is reserved for master

controller. When ECL controller is

connected to BUS, ECL is always

master and EPU is slave. Addresses 0,

1 or 2 are reserved for slave controls

(see speical settings).

Slave controls with address 0 (max. 8

slave controls) can receive outdoor

Frost protection

EPU 2350 and 2354 have built-in frost

protection to prevent sensor

temperatures from falling below +6 °C.

R1 and R2 are activated (circulation

pump cut-in) even when just one of the

sensor temperatures S1, S2, S2* or S4

falls below +6 °C.

When connecting a separate S3 frost

protection sensor any place in the

system can be frost protected at +2 °C.

temperature (frost protection sensor)

and time switch signals from the master

controller.

Slave controls with addresses 1 and 2

(max. one control per address) can

receive outdoor temperature signals

(frost protection sensor S3) and time

switch signals from master controller

and can send reference temperatures to

the master controller.

R1 and R2 are activated (circulation

pump cut-in) when sensor temperature

S3 falls below +2 °C.

If circulation pumps must operate at out-

door temperatures below +2°C outdoor

sensor ESMT must be mounted on S3.

When several controls are coupled out-

door temperature signal (frost protection

sensor S3) is transferred via BUS.

12 VI.72.J3.02 © Danfoss 9/97 BC-HM

Time control

EPU 2350/2354 can be time controlled

via a built-in time switch mounted in the

controller or via an external time switch

or manual switch. Relay outlets R1 and

R2 status depends on time switch setting.

Time switch type Reduced temp R1 R2

1-zone time switch follows zone 1 follows zone 1 always ON

2-zone time switch follows zone 1 follows zone 1 follows zone 2*)

ECA 9020 follows zone 3 follows zone 3 follws zone 4*)

*) Only at PI-control

when gold-plated contacts are used.

The contacts are connected directly to

terminals 3 and 4. Contacts close to

cut-in constant normal temperature.

b) ECA 9020

EPU can be time controlled/overridden

via control panel ECA 9020. Connect

terminals 1 and 2 (BUS).

One of the four ECA 9020 time swich

zones is addressed to control EPU.

EPU as Master

- address 15 = zone 3

EPU as Slave

- address 0 = no time control

- address 1 = zone 1

- address 2 = zone 2

Note!

ECA 9010 overrides ECA 9020 normal

or reduced temperature operations.

External time control

EPU can be time controlled via an

external signal. The signal can be

transferred from below units.

a) External time switch

or manual switch

EPU can be time controlled via an

external time switch or manual switch.

When the contacts are not gold-plated

use the override module ECA 9010.

ECA 9010 is connected on EPU control

terminals 3 and 4 to adapt the external

switch signal to EPU. Function switch

must be in position "time switch" and

time switch contact (NO) must close

when activated.

Connect switch with ECA 9010 terminals

2 and 3 for normal temperature override.

Connect switch with ECA 9010 terminals

1 and 3 for reduced temperature

override.

ECA 9010 for constant reduced

temperature override is not necessary

BC-HM VI.72.J3.02 © Danfoss 9/97 13

Controller settings

User settings

a) Programmable time switch

b) Temperature setting

c) Funktion switch

d) Indications

e) User guide

a) Time switch

Analog time switch is set in the required

normal and reduced temperature periods

in pushing riders for reduced

temperature settings towards the center

of the time switch.

Set actual time and week day vis-a-vis

the mark in turning the dial in arrow

direction

Digital time switch ECA 9016 or 9017,

see enclosed user guide.

b) Temperature setting

Use the temperature knop for setting

required storage or flow temperature

(reference temperature for S1). Setting

range 30 - 70 °C.

c) Funktion switch

Valve closes and circulation pump

stops, frost protection at 6 °C.

Constant reduced temperature.

Time switch override

Automatic changeover between

normal and reduced temperature

according to time switch settings.

Constant normal temperature. Time

switch is overridden.

Manual control. Controller function

off. Valve motor receives no control

signals, use button b) for manual

valve control.

d) Indications

ON - alight, when controller has been

connected and functions properly

- off if controller is defect or if S1

sensor is interrupted, short-

circuted or missing

- flashes, when frost protection is

active. Frost protection is active

when:

- S1, S2, S2* or S4 are lower

than +6 °C

- S3 is lower than +2 °C.

- flashes together with

when

function switch is set in position

. Number of interruptions show

number of connected sensors.

- alight at reduced temperature

control

- flashes together with ON when

function switch is in position

Number of number of connected

sensors.

▲ alight as long as gear motor

receives signal to open the valve

(to increase temperature).

Shortest signal is 0.5 sec.

▼ alight as long as gear motor

receives signal to close the valve

(to reduce temperature). Shortest

signal is 0.5 sec.

14 VI.72.J3.02 © Danfoss 9/97 BC-HM

neutral zone. The function is similar to a

3-position thermostat.

h)h)

Proportional band - XProportional band - X

Proportional band - X

Setting range 1 - 40 °K.

Proportional band states temperature

range, where motor control impuls

period is proportional to temperature

deviation. Beyond this range, the control

impulse is constantly ON. A small

proportional band is at risk of unstable

control.

i) Temperature difference - i) Temperature difference -

i) Temperature difference -

∆∆

∆

Setting range is 1 - 30 °K

This function is in operation only in

storage charge systems with 1 or 2 S2-

storage sensors.

1 storage sensor:

S2 sensor temperature difference

between cut-in and cut-out temperature

2 storage sensors:

Temperature difference between cut-in

temperature (top sensor S2) and cut-out

temperature (bottom sensor S2*)

j) Return temperature limit - j) Return temperature limit -

j) Return temperature limit -

Setting range 30 - 70 °C.

Return temperature is limited according

to temperature setting, potentiometer j).

Choose minimum or maximum

temperature limit (switch 1) and

amplification 4 or 8 (switch 2). S1

reference is reduced when return

Installer settingsInstaller settings

Installer settings

f) Reduced temperature -

g) Integration time - T

h) Proportional band - X

i) Temperature difference at ON/OFF-

cylinder charge control - ∆T

j) Return temperature limiter

k) Miniswitches

f) Reduced temperature -f) Reduced temperature -

f) Reduced temperature -

Setting range 1 - 40 K and OFF.

Controls with time switch can reduce

normal temperature according to

potentiometer f) settings of period and

degrees

If potentiometer is set in pos. OFF

temperature will be reduced to frost

protection limit (+6°C) during the

required period.

g)g)

Integration time - TIntegration time - T

Integration time - T

Setting range 0 - 10 minutes and OFF.

Integration time states the time that runs

until I-function has changed the output

signal like P-function. A short time

results in a quick control but large

overshooting (risk of unstability)

If the potentiometer is set in pos. OFF,

the integration function is off and the

proportional band X

will equal the

k) Miniswitches

EPU 2350 and 2354 have eight

miniswitches (DIL-switches). The

miniswitches are used for special

settings and functions.

Switch 1 - Return limit function

Choose maximum or minimum return

temperature limit of potentiometer

temperature j). At maximum or minimum

limit return temperature is kept below or

above temperature setting, respectively.

S1 reference is reduced.

Switch 4 - operation difference

between S1 and S2

(This function is used only in charge

circuit systems)

Choose operation difference between

charge temperature (temperature

setting) and S2 sensor cut-out

temperature.

Switch 4 operation signal

ON 10 K

OFF 5 K

Switch 5 function

ON valve operates

OFF valve is closed

Switch 1 Funktion

ON max. limit

OFF min. limit

Switch 2 - Return limit amplificationSwitch 2 - Return limit amplification

Switch 2 - Return limit amplification

Choose return limit amplification (i.e. S1

reference temperature reduction at each

return temperature deviation degree.

Switch 2 amplification

ON 8 times

OFF 4 times

Switch 3 - neutral zoneSwitch 3 - neutral zone

Switch 3 - neutral zone

Choose neutral zone for PI-control

circuit. Valve motor receives no signal

when temperature is within the neutral

zone.

Switch 3 neutral zone

ON 3 K

OFF 1 K

Switch 5 - Charge temperature at

standby

(This function is used only in charge

circuit systems)

Choose charge temperature at standby,

i.e. charge temperature is maintained

(valve is operating) or frost protection

+6°C (valve is closed)

Switch 6 - Ventil/motor constant

Choose approx. valve motor operation

period from closed to open valve

Switch 6 function

ON 20 sec (quick)

Example:

AMV 323 - 1 s/mm

+ VMO, VR - 15 mm

OFF 120 sec (slow)

Example:

AMV 123 - 8 s/mm

+ VMO, VR - 15 mm

Switches 7 and 8 - Addressing

When controller is coupled with other

EPU or ECL controls via BUS, the

controller must be given an address.

See paragraph "Master/slave units".

Following addresses are available:

Switch

Address

OFF O N 0

ON ON 1

O N OFF 2

OFF OFF 15

Controller self-test and sensor test

EPU 2350 and 2354 can operate both

self-test and sensor test. Set function

switch in position

. After approx. 5

sec. both ON and

will flash and show

test result. The result will be repeated

every 3rd second.

Test result can show:

1, 2, 3, 4, or 5 interruptions

Number of interruptions corresponds to

number of connected sensors. If the

number of interruptions does no

correspond, one or several sensors

might be defect or are not connected.

No light

Controller is defect or S1 sensor is not

connected.

Constant light

The controller is defect.

Manual valve control

When testing or adjusting gear motor

limit switches valve can be manually

controlled in setting function switch in

position

and turning temperature

button.

Open valve

Turn temperature button all the way to

the right (clockwise)

Close valve

Turn temperatue button all the way to

the left (anti-clockwise).

If the motor does not rotate in correct

direction wires must be interchanged, i.e.

terminals 16 and 17.

Monting

On wall

Use standard base plate or special base

plate with wall case for mounting EPU

controller.

The plate is fixed on a flat surface with

two ∅4 mm screws (standard base

plate) or three ∅4 mm screws (special

base plate). Be aware of the "UP"-arrow.

Then wire EPU controller as described in

paragraph "Wiring".

EPU is mounted in base plate (when

using speical base plate, note that the

controller is first of all to be fit into the

wall case) and screw up the center

screw behind the cover plate.

In panel

EPU can be built into a panel. The

opening is to measure 92 × 138 mm and

the plate is to be max. 3 mm thich.

Fix four retainer springs on the

controller, push it gently into the opening

and the springs will secure the controller

in the opening. The retainer springs are

delivered as accessories togeter with 2

terminals strips.

Wire EPU to the two terminal strips and

then mount them in the controller. The

terminals strips are encoded to prevent

exhange by mistake.

On DIN-rail

EPU can be mounted on a 35 mm DIN-

rail. Fix a spring - delivered as

accessory - on the base plate bottom

and then mount the base plate on the

DIN-rail.

Several controllers in parallel

In panel

On wall or DIN-rail

DismountingDismounting

Dismounting

Controllers in panels are dismounted in

pressing retainer springs together and

pushing controller out.

When retainer springs are not

accessible use a screw driver to tip out

the controller.

Time switch mounting

Remove glass cover, inside cover and

time switch cover and then mount time

switch.

Open the glass cover all the way to the

left - the pintles will then slide out. Tip

out inside cover and unscrew time switch

cover.

Time switch is placed in the center of the

opening with plugs downwards.

Time switch dismounting

Remove screws and gently tip out time

switch.

Danfoss EPU 2350/2354 Operating instructions

Danfoss EPU 2350/2354 Operating instructions

Danfoss EPU 2350/2354 Operating instructions

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