Heating And Cooling With Duct Temperature Control - Danfoss ECL Comfort 210 Installation Manual

Installation Guide
The application A214.4 is very flexible. These are the basic
principles:

Heating and cooling with duct temperature control:

Typically, the heating and cooling temperature is adjusted
according to your requirements.
The flow temperature sensor S3 in the heating circuit is the most
important sensor. The desired temperature at S3 is set in the ECL
Comfort controller as the 'Desired balance temperature'.
The motorized control valve M1 (controlling the heating
temperature) is opened gradually when the flow temperature is
lower than the desired flow temperature and vice versa. At cooling,
the motorized control valve M2 controls the cooling temperature.
Duct temperature:
A too low duct temperature (S4) will activate the heating circuit
(M1), whereas a too high duct temperature will activate the cooling
circuit (M2).
At heating demand, the duct temperature (S4) can adjust the
desired temperature at S3 when not being equal to the desired
duct temperature. At cooling demand, the duct temperature (S4) is
controlled according to the desired duct temperature.
By means of a week schedule (up to 3 'Comfort' periods / day), the
heating circuit can be in 'Comfort' or 'Saving' mode (two different
temperature values for desired duct temperature).
The desired duct temperature determines a correction of the
desired temperature at S3 in heating mode. In cooling mode the
cooling is OFF during 'Saving'.
The fan (F1) is ON / OFF controlled according to the schedule and
heating / cooling demand. The damper (P2) is ON / OFF controlled
according to schedule. The circulation pump (X3) is ON / OFF
controlled according to heating demand.
For a description of alarms, compensation temperature, return
temperature limitation (S5) and frost protection (S6 and S7), please
read the section 'A214 and A314 in general' .
Danfoss District Energy
ECL Comfort 210 / 310, application A214 / A314
Typical A214.4 application:
S 1
S 3
X3
P 2
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:
S1
Outdoor temperature sensor
S2 Compensation temperature sensor (not illustrated)
S3 Flow temperature sensor, heating circuit
S4 Duct temperature sensor
S5 Return temperature sensor
S6 Frost temperature sensor
S7
Frost thermostat
S8 Fire alarm input (not illustrated)
M1 Motorized control valve, heating
M2 Motorized control valve, cooling
F1 Fan
P2 Damper
X3
Circulation pump
R4
Relay output, alarm, ECL Comfort 210
(R6)
Relay output, alarm, ECL Comfort 310
VI.GU.A1.02
ECL 210 / (310)
R4 (R6)
M1 M2
S 5
F1
S 6
S 7
DEN-SMT/DK 7