Airedale EcoChill 6kW - 46kW - Manual (Page 10)

10 EcoChill Installation Manual 7481930_v1.6.0_08_2013
ECL-ECLH 020-202
EN
Electronic controller
MODU CONTROL
Control of the leaving water temperature with a proportional-integral algorithm: main-
tains the average leaving temperature to the desired valve
− Auto-adaptive differential starter timer: ensures the compressor minimum required
running time for systems with low water content
− Intelligent defrost by decreasing pressure: determines when the coil is frosted avoid-
ing unnecessary defrost cycles
− External air temperature setpoint compensation (with external air temperature sensor
accessory): reduces electrical consumption
− Condensing control based on pressure, rather than temperature, for absolute stability
(with DCPX fan speed controller accessory)
− Inverted condensing control for operation in heat pump mode even in the summer
(with DCPX fan speed controller accessory)
− Pre-alarms with automatic reset: in case of alarms a number of restarts are permitted
before a definitive lock out
− Alarm based on ∆T: to identify errors (reverse rotation) or reversing valve blocked
− Compressor hour run counter
− Compressor number of starts counter
− Alarm history
− Automatic restart after power failure
− Local or remote control
Display of unit status:
1. Power on
2. Compressor ON/OFF
3. Operating mode (heating/cooling)
4. Alarm active
Display of sensors, transducers and parameters
1. Water outlet temperature
2. Water inlet temperature
3. Coil temperature (heat pump unit)
4. Discharge refrigerant temperature
5. External air temperature (heat pump, cooling only with DCPX and sensor)
6. Discharge pressure (heat pump unit)
7. Suction pressure (heat pump unit)
8. Error from setpoint temperature (sum of the proportional and integral error)
9. Delay time to start / stop the compressor
10. Control of alarms
11. Low pressure
12. High pressure (pre-alarm: pressostat directly removes power to the compressor)
13. High discharge temperature
14. Anti-freeze
15. Flow protection
16. Alarm based on ∆T
− Alarms with automatic reset and limited number of resets before definitive lock out
− ON/OFF control from remote contact
− Change of season from remote contact
For further information refer to the user manual.
SAFETY VALVE
With discharge pipe connection facility, and will operate
in cases of hydraulic system overpressure.
AIR VENT
(Versions "P-N-A-Q")
Mounted at the highest level of the hydraulic system. The
air vent is used for the release of any air pockets from the
hydraulic circuit.
SYSTEM BUFFER TANK
Manufactured in steel and to reduce heat gain and avoid
the formation of condensation is insulated with polyure-
thane material of adequate thickness.
The buffer tank reduces the number of compressor starts
and stabilises the water temperature delivered to the
system.
5.5. CONTROL AND SAFETY COMPONENTS
HIGH PRESSURE PRESSOSTAT (manual reset)
Fixed setting, fitted on the refrigerant high pressure
side, stops the operation of the compressor in case of
abnormal pressures.
LOW PRESSURE PRESSOSTAT
(only versions "° | C")
Fixed setting, fitted on the refrigerant low pressure
side, stops the operation of the compressor in case of
abnormal pressures.
HIGH PRESSURE TRANSDUCER
Mounted on the refrigerant circuit high pressure side
provides the operating pressure to the control board and
generates a pre-alarm in case of abnormal pressure.
LOW PRESSURE TRANSDUCER
(only version "H")
Mounted on the refrigerant circuit low pressure side
provides the operating pressure to the control board and
generates a pre-alarm in case of abnormal pressure.
5.6. ELECTRICAL CONTROL AND POWER
PANEL
Electrical panel conforming to EN 60204-1/IEC 204-1,
complete with:
- Control circuit transformer
- Door interlocked isolator
- Circuit breakers and contactors for compressors and
fans
- Terminals for REMOTE PANEL
- Spring type terminals for control circuit
- Externally rated cabinet with double panel and seals
- Electronic controller
- Relay output for evaporator pump and heat recovery
pump enable (only for versions without pump assem-
bly)
- All cables numbered
DOOR INTERLOCKED ISOLATOR
Access to the electrical panel is by operating the handle
of the door interlocked isolator which removes power
to the unit. To avoid accidentally powering up the unit
during maintenance the isolator is fitted with a locking
mechanism.
CONTROLLER KEYPAD
Allows complete control of the unit. For further informa-
tion refer to the user manual