Installation; Before You Start - Danfoss ECL Comfort 310 Operating Manual

Operating Guide

2.0 Installation

2.1 Before you start

The ECL application key P318 contains two subtypes, P318.1 and
P318.10.
The basic principles for application P318.1:
Temperature control of DHW buffer
The desired DHW temperature at S6 determines the buffer charging
procedure. The buffer temperature sensors S6 and S8, the supply
temperature sensor S2 and the charging temperature sensor S3 are
the most important sensors and must be connected. If one of the
mentioned temperature sensors is not connected, the control valve
M1 will close; alternatively, the control pump P1 / V1 will stop.
The charging temperature at S3 is based on the desired DHW
temperature at S6 and a set charging difference.
The application allows internal or external DHW circulation. When
connected for external circulation, the desired S3 temperature is
the same as the desired DHW temperature, when charging is not
in progress.
Optional: Temperature control of the circulation pipe at S9 ensures
the desired temperature by means of ON / OFF control of P3 or
speed control of V3. During the charging process the circulation
pump can be switched OFF or run at a minimum speed.
Start buffer charging process:
1. Buffer temperature S6 temperature gets lower than ('Desired
DHW temperature' + 'Start difference').
An example: 60 °C + (-5) = 55 °C
2. X1 is switched ON
3. M1 opens to a preset position (alternatively, P1 / V1 is switched
ON / preset speed) in order to increase the supply temperature
S2. Return temperature limitation is respected.
4. P2 / V2 is switched ON when supply temperature S2 gets higher
than ('Desired DHW temperature' + 'Pump start diff.').
An example: 60 °C + 3 K = 63 °C
V2 starts with minimum speed, for example 20 %.
5. M1 (or P1 / V1) controls the charging temperature at S3.
6. V2 increases the speed as long as the charging temperature S3
is higher than (desired charging temperature - 2 K).
Stop buffer charging process:
1. Buffer temperature S6 temperature gets higher than (2 K +
'Desired DHW temperature' + 'Start difference)
AND
Lower buffer temperature S8 gets higher than ('Desired DHW
temperature' + 'Stop difference).
An example: S6 temperature higher than (2 + 60 °C + (-5) =
57 °C) AND (60 °C + (-8) = 52 °C)
2. P2 is switched OFF, respecting 'Char. P post-run'. V2 changes
to 0 %.
NOTE: Post-run is not respected if charging temperature S3 is lower
than desired charging temperature.
3. X1 is switched OFF.
4. M1 closes (alternatively, P1 / V1 stops) or maintains the desired
temperature at S3.
6 DEN-SMT/DK
ECL Comfort 310, application P318
P318.1, ex. a, application with control valve and internal DHW circulation:
The shown diagram is a fundamental and simplified example and does
not contain all components that are necessary in a system.
All named components are connected to the ECL Comfort controller.
List of components:
ECL 310 ECL Comfort 310 controller
ECA 32 Built-in extension module, 0 - 10 V outputs
ECA 35
Built-in extension module, 0 - 10 V outputs and
PWM outputs
S2 (mandatory) Supply temperature sensor
S3 (mandatory) Charging temperature sensor
Return temperature sensor
S5
S6
(mandatory) Buffer temperature sensor
S8
(mandatory) Lower buffer temperature sensor
S9 DHW circulation return temperature sensor
S12 0 - 10 V input for desired temperature at S6
P2 Charging pump (ON-OFF controlled)
V2
Speed control of charging pump (0 - 10 V or PWM)
P3
Circulation pump (ON-OFF controlled)
V3
Speed control of circulation pump (0 - 10 V or
PWM)
M1 Motorized control valve (3-point controlled)
X1
Heat demand signal
A1
Alarm
VI.JM.Q3.02
Danfoss District Energy