Danfoss EPU 2370 User manual

BC-HM VI.72.M4.02 Danfoss 11/97 1

Instructions (user manual)

EPU 2370

Contents

Installation........................................2-4

Electrical connections

and wiring diagram..........................5-6

Selection of system type ................... 7

Setting of system type ....................... 8

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 ..............................12

General frost protection ..................12

Digital settings.............................13-21

- operation

- position overview (matrix)

- position function description

(pages 15-21)

System types................................22-48

- see overview on page 7

087R9367

2 VI.72.M4.02 Danfoss 11/97 BC-HM

Installation

Wall mounting

For wall mounting use either a standard

base plate or a special base plate with

associated case.

Fasten the base on a flat surface using

two ∅4 mm screws (standard base

plate) or three ∅4 mm screws (special

base plate). Remember that the arrow in

the bottom of the base plate must point

upwards.

The control can now be wired (see

section “Electrical connections”).

The control must be mounted in the

base (with special base plate mount

case first) and fastened with the staybolt

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 mounting.

The retainer springs are available as

accessories, the set consisting of four

springs and two terminal strips.

Electrical connections must be made to

the loose terminal strips which can then

be mounted. The terminal strips are

coded to prevent mains voltage section

from being connected to low-voltage

section.

Mounting on DIN rail

The control can be mounted on a 35 mm

DIN rail. The base must be fastened by

a spring (available as an accessory)

which must be fitted at the rear of the

base before mounting on the DIN rail.

BC-HM VI.72.M4.02 Danfoss 11/97 3

Several EPU 2370 controls, side by side

Panel mounting

Wall mounting or on DIN rail

Removal from 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 the

control, it can be tilted out of the cutout

by inserting a screwdriver in the two

recesses provided in both ends of the

unit.

4 VI.72.M4.02 Danfoss 11/97 BC-HM

Time switch mounting

An analog or digital time switch can be

fitted by first removing the plastic lid,

cover plate and time switch cover.

Remove the lid by pressing it towards

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 time switch and frame with

the screws provided.

Replacement of time switch

The time switch can be removed after

the screws have been taken out by

carefully tilting it from the top with a

small screwdriver.

BC-HM VI.72.M4.02 Danfoss 11/97 5

Electrical connections and

wiring diagram

Connection to 230 VAC -

(terminals 13-24)

The control must be connected using the

terminal strips with screw terminals.

Up to 3 x 1.5 mm² or corresponding

wires can be connected in each

terminal. The terminal strips are coded

to prevent terminal strips with mains

voltage being connected to sensor

terminals.

Terminal Load

Neutral (N) - 230 V~ 13

Phase (L) - 230 V~ 14

16 (close) 8(2)A 250V~

Reversible gear motor 230 V~, AMB, AMV etc. 17 (open) 8(2)A 250V~

Relay output R1 - 230 V~ (NC) 21 - 22 8(2)A 250V~

Relay 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 mm²

Total length of all sensor and BUS

wires: max. 150 metres.

Type Terminal

S1 flow/duct (PI circuit) ESMA/B/C/U 10 - 11

storage tank upper sensor ESMB/U

S2 7 - 9

room sensor (P circuit) ESMR

S3 frost protection sensor ESMB/U/T 11 - 12

S4 return temperature sensor ESMA/B/C/U 4 - 6

S5 external setpoint ESME 4 - 5

storage tank lower sensor ESMB/U

S6 8 - 9

compensation sensor ESMR/T

External time switch/override ECA 9010 3 - 4

Communication BUS 1 - 2

Note!

Wire resistance can give measurement

error. A resistance of 4 ohm corresponds to a temperature increase

of about 1 degree.

6 VI.72.M4.02 Danfoss 11/97 BC-HM

Wiring diagram (general)

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

possibilities are chain-dotted (see

system types on pages 22-48).

BC-HM VI.72.M4.02 Danfoss 11/97 7

Selection of system type

EPU 2370 is a multipurpose control for

use with several different types of

systems. Therefore the type of system

must be selected before the control is

operated. The selection procedure is as

follows: 1) Connect sensors, 2) Connect

voltage, 3) Select system type.

The individual system type numbers

denote different control principles. When

the necessary sensors have been

connected and the system type

selected, control operation on that

principle is automatically activated.

The following system types can be

selected in P0.2 (see also page 8):

System

System-

Description type Page

type number

Installation 0

No control, but sensor temperatures can be

read off and valve motor and relay outputs can be

controlledmanually.

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 of hot-water-service system with 1-C

secondary mixing - (PI)

Control of heat exchanger - storage tank charging with 1-D and 1-E

one or two tank sensors - (ON/OFF + PI).

Radiator system 2 30-33

Constant flow temperature control - (PI) 2-A

Constant room temperature control - (P+PI) 2-B

Water to air system (unit heater) 3 34-37

Constant room temperature control - (P+PI) 3-A

Floor heating system 4 38-41

Constant flow temperature control - (PI) 4-A

Constant room temperature control - (P+PI) 4-B

Ventilation system 5 42-45

Constant duct temperature control - (PI) 5-A

Constant room temperature control - (P+PI) 5-B

Refrigeration system 6 46-48

Constant brine temperature control - (PI) 6-A

Constant room temperature control - (P+PI) 6-B

8 VI.72.M4.02 Danfoss 11/97 BC-HM

Setting of system type

number

- Remove the black cover plate.

- Set the position selector (f) on 0.

- Press the + key (d) twice.

The display will now change between

P0.2 and a number between 0 and 6.

- With a pointed object, press the SET

key (i). The number will begin to flash.

- Press either the + or - key (d or e)

until the display shows the required

system type number.

- Press the SET key (i) to store the

required 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.

Display of actual temperature

Actual temperature (hot water, flow or

room temperature) can be read off with

the function selector (f) on (pos. 7).

Setting required normal temperature

Set the position selector (f) on (pos.

8). The temperature can be increased or

reduced by pressing the + or - key.

Setting required reduced temperature

Set the position selector (f) on (pos.

9). The temperature can be increased or

reduced by pressing the + or - key.

BC-HM VI.72.M4.02 Danfoss 11/97 9

Operation

a) Program time switch

b) Light emitting diode

c) Display

d) + key

e) - key

f) Position selector

g) Function selector

h) User instructions

a) Program time switch

If an analog program time switch is

mounted it can be set for normal and

reduced temperature periods by pushing

the slides in towards the middle to set

the periods in which an reduced

temperature is required.

The correct time and day can be set

opposite the markings by turning the dial

in the direction of the arrow.

If a digital time switch type ECA 9016 or

9017 is used, see the instructions

enclosed with the time switch.

b) Light emitting diode

The diode indicates as follows:

- lights up constantly when the control

is on.

- flashes when an alarm signal 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) + and - keys

These keys are for use when setting and

programming the control.

f) Position selector

The function selector is for use in

selecting temperature indication and

programming. The selector can be set in

ten different positions, but on the cover

plate only three positions and associated

symbols are shown.

The display indicates the actual

temperature at sensor S1 (PI

control) or sensor S2 (P + PI

control).

TThe display indicates the required

normal temperature. The

temperature can be changed using

the + and - keys.

TThe display indicates the required

reduced temperature. The

temperature can be changed using

the + and - keys.

The remaining seven positions are used

for indicating other system temperatures

and in programming (see digital settings,

page 13).

10 VI.72.M4.02 Danfoss 11/97 BC-HM

g) Function selector

Control stopped, but system frost-

protected at 6 °C.

Time control not possible.

Constant reduced temperature.

The status of relay outputs depends

on the type of system selected.

Changeover between normal and

reduced temperature, as set on the

time switch.

The status of relay outputs depends

on the type 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

operated manually with + and -

keys.

Relay outputs R1 and R2 can be

operated manually by pressing the

SET key (i) (see page 13).

The following combinations are

possible:

R1 (I)R2 (II)

0 = open contact

1 = closed contact

In P0.0 the relay status and motor

function are displayed by horizontal

bars. A horizontal bar means

closed contact, see page 15, P0.0

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