D-EIMHP01505-22_00EN 23/59
N.B.: The filter and the shut off valves are supplied together with the unit inside the cabinet and shall be installed before
operating.
4.9.1. Water piping
Piping must be designed with the lowest number of elbows and the lowest number of vertical changes of direction. In this
way, installation costs are reduced considerably, and system performance is improved.
The water system must have antivibration mountings to reduce transmission of vibrations to the structures.
Protection of the water circuit is necessary in the winter season, even with the unit not operating.
•
Before insulating water piping, check that there are no leaks. The complete hydraulic circuit must be insulated to
prevent condensation and reduced refrigeration capacity. Protect the water pipes from frost during winter (using
for example a heating cable).
•
Check that the water pressure does not exceed the design pressure of the water side (3 bar).
Select the piping diameter in relation to the required water flow and available external static pressure of the pump. See
the following table for the recommended water piping diameter.
Unit
Water piping
diameter
EWYT021~040CZI-A1
1 ¼
”
EWYT064CZI-A2
2
”
Table 8
– Water piping diameters
4.9.2. Flow switch
The purpose of the flow switch is to stop the unit in the event of interrupted water flow, thus protecting the BPHE from
freezing.
This is a palette flow switch appropriate for uninterrupted use outdoors (IP65).
The flow switch is set up to intervene when the water flow of the BPHE reaches the minimum acceptable flow value (see
the table below).
Model
Flow switch Setpoint [l/min]
EWYT021CZI-A1
22
EWYT032CZI-A1
31
EWYT040CZI-A1
31
EWYT064CZI-A2
57
Table 9
– Flow Switch Setpoint
4.9.3. Repairing and checking the water circuit connection
The units have water inputs and outputs for connecting the heat pump to the water circuit of the system. This circuit must
be connected to the unit by an authorized technician and must comply with local regulations.
If dirt penetrates the water circuit, there could be problems.
Therefore, always remember the following when connecting the water circuit:
▪
Only use pipes that are clean inside.
▪
Keep the end of the pipe facing downward when removing any burrs.
▪
Cover the end of the pipe when inserting it through a wall to avoid dust and dirt getting in.
▪
Clean the pipes of the system located between the filter and the unit, with running water, before
connecting it to the system.
4.9.4. Water pressure
Check whether the water pressure is above 1 bar. If it is lower, add water.
The maximum operating pressure is 3 bar.
4.10. Water treatment
Before putting the unit into operation, clean the water circuit.
