BC-HM VI.72.Q2.02 Danfoss 11/96 1
Instructions EPU 2370
(mounting and system selection)
Contents
Installation........................................... 2
Electrical connections
and wiring diagram............................. 3
System overview ................................4
Setting of system type number......... 5
Hot-water service systems
(type 1)...............................................6-9
Radiator systems (type 2) ...........10-11
Water-to-air system (type 3) ............12
Floor heating system (type 4).....14-15
Ventilation systems (type 5) .......16-17
Refrigeration systems (type 6) ...18-19
087R9484
087R9484
2 VI.72.Q2.02 Danfoss 11/96 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.Q2.02 Danfoss 11/96 3
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 (S2*) 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.
4 VI.72.Q2.02 Danfoss 11/96 BC-HM
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 5):
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
controlled manually.
Hot-water-service system 1 6-9
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 10-11
Constant flow temperature control - (PI) 2-A
Constant room temperature control - (P+PI) 2-B
Water to air system (unit heater) 3 12
Constant room temperature control - (P+PI) 3-A
Floor heating system 4 13-14
Constant flow temperature control - (PI) 4-A
Constant room temperature control - (P+PI) 4-B
Ventilation system 5 15-16
Constant duct temperature control - (PI) 5-A
Constant room temperature control - (P+PI) 5-B
Refrigeration system 6 17-18
Constant brine temperature control - (PI) 6-A
Constant room temperature control - (P+PI) 6-B
BC-HM VI.72.Q2.02 Danfoss 11/96 5
Setting of system type
number
- Remove the black cover plate.
- Set the function 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 function selector (f) on
(pos.
8). The temperature can be increased or
reduced by pressing the + or - key.
Setting required reduced temperature
Set the function selector (f) on
(pos.
9). The temperature can be increased or
reduced by pressing the + or - key.
Setting of time switch and function
selector
See user instructions.
6 VI.72.Q2.02 Danfoss 11/96 BC-HM
System types 1-A, 1-B and 1-C - hot-water-service systems
System 1-A - Hot-water-service system with 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.
Temperature held constant by motor
valve control M in heat exchanger/tank
primary circuit.
Circulation pump P1 controlled by relay
R1.
BC-HM VI.72.Q2.02 Danfoss 11/96 7
System 1-C - Hot-water-service storage tank with secondary mixing
Wiring diagram - System types 1-A, 1-B and 1-C
8 VI.72.Q2.02 Danfoss 11/96 BC-HM
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 charging (circulation
through exchanger)
BC-HM VI.72.Q2.02 Danfoss 11/96 9
Control principle
PI control of the temperature in the
charging circuit (S1) and ON/OFF
control of the storage tank temperature
(S2/S6).
Charging temperature held constant by
motor valve control M in heat exchanger
primary circuit. Circulation pump P1
controlled by relay R1, charging circuit
pump P2 by relay R2.
Wiring diagram - System types 1-D and 1-E
10 VI.72.Q2.02 Danfoss 11/96 BC-HM
System types 2-A and 2-B - Radiator systems
System 2-A - Radiator system with flow temperature control
System 2-B - Radiator system with 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 control.
Flow temperature (S1) kept constant by
motor valve control M. Circulation pump
P1 controlled by relay R1.
valve control M. Circulation pump P1
controlled by relay R1.
BC-HM VI.72.Q2.02 Danfoss 11/96 11
Wiring diagram - System types 2-A and 2-B
12 VI.72.Q2.02 Danfoss 11/96 BC-HM
System type 3 - Hot air blower (unit heater)
System 3 - Unit heater system with constant room temperature
Control principle
PI flow temperature control (S1) and P
room temperature control (S2). Flow
temperature is held constant by motor
valve control M. Fans P1 controlled by
relay R1, circulation pump P2 by relay
R2.
Wiring diagram - System type 3
BC-HM VI.72.Q2.02 Danfoss 11/96 13
System 4-A - Floor heating with constant flow temperature
System 4-B - Floor heating with constant room temperature
Control 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 - Floor heating
Control principle
PI flow temperature control. Flow
temperature (S1) held constant by motor
valve control M. Circulation pump
controlled by relay R1.
14 VI.72.Q2.02 Danfoss 11/96 BC-HM
Wiring diagram - System types 4-A and 4-B
BC-HM VI.72.Q2.02 Danfoss 11/96 15
Control principle
PI control of supply air temperature (duct
temperature - S1). Temperature held
constant by motor valve control M in
System 5-A - Ventilation system with constant supply air temperature
System 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 motor valve control M
in heat exchanger primary circuit. Fan
P1 controlled by relay R1, damper P2 by
relay R2.
System types 5-A and 5-B - Ventilation system
heat exchanger primary circuit. Fan P1
controlled by relay R1, damper P2 by
relay R2.
16 VI.72.Q2.02 Danfoss 11/96 BC-HM
Wiring diagram - System types 5-A and 5-B
BC-HM VI.72.Q2.02 Danfoss 11/96 17
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
18 VI.72.Q2.02 Danfoss 11/96 BC-HM
Wiring diagram - System types 6-A and 6-B
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