EDM SYSLOOP (EDM SL 01 S 2GB)

SYSLOOP
3
Control Features
All SYSLOOP water source heat pumps are, in their standard version,
equipped with a Siemens POL423 electronic control system which
manages their operation and their safety devices.
The conguration of the POL423 electronic control enables four
different operating modes for water source heat pumps by selecting
the following systems :
Thermodynamic cooling and heating operation;
Thermodynamic cooling and heating operation or heating
operation with an additional electric heater;
Thermodynamic cooling operation and electrical heating
operation;
Thermodynamic cooling operation only.
POL822 remote control
An POL822 remote control is supplied as optional in the electrical
control box of the units.
It enables individually controlled operation or stand-alone regulation.
The POL822 remote control is ergonomically designed and discreet. It
comprises a digital display and essential functions such as :
On/Off,
Selection of operating mode,
Room temperature display,
Fan speed selection,
Temperature set-point adjustment
Alarm code display
Master/slaves control : the standard version of the POL423 electronic
control enables operation in master/slaves regulation mode for up to
15 water source heat pumps using a single POL822 remote control.
Thiscongurationenablestheinstallertosaveonthepurchaseand
wiring of equipment such as auxiliary relays and multi-wire cables
between the various water source heat pumps. Only a bus cable with
2 twisted pairs is necessary between the master and slave units.
Anti-freeze safety function : this is provided by two temperature
sensors. In cooling mode an "ICT" temperature sensor located in the
nned coil protects thewater source heat pump against accidental
freezing.
In heating mode, the safety function is provided by an "LWT" minimum
water outlet temperature sensor.
The automatic reset LP pressure switch completes the anti-freeze
safety function by monitoring a minimum acceptable suction pressure
to ensure correct operation of the compressor.
High temperature safety function : the "ICT & LWT" temperature
sensorscheck thatthe condensationtemperatureat thennedcoil
and the water temperature at the outlet of the water/refrigerant heat
exchanger do not exceed the authorised limits.
The automatic reset HP pressure switch completes the high
temperature safety function.
Electric heater : SYSLOOP water source heat pumps can be factory
equipped with an optional in-duct air heater located at the fan outlet.
The electric heaters are also available in kit.
The electricheater functioncan, dependingon thecongurationof
the POL423 electronic control, be used in place of the thermodynamic
heating as soon as the temperature in the water system drops below
a minimum limit, or it can be used as an electric heating system on
its own.
Units are factory equipped with two electric heater stages.