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
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)
00
01
10
11
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