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26
ENG
Heos BOX R704
+0300140EN - rel. 1.0 - 25.05.2022
4.9 Refrigerant discharging procedure
The following points should be considered general indications for correctly
discharging refrigerant from the unit, and are not technical specifications.
In the event of welding or cutting operations on the refrigerant circuit (e.g.
to replace a component), it is recommended to completely discharge all of
the R744 refrigerant contained in the system.
The recommended sequence is as follows:
1. Switch HEOS BOX off. Electrically disconnect HEOS BOX using the on/
off switch on the unit and the disconnect device upstream of the unit’s
power supply line. Then remove the refrigerant circuit cover panel.
2. Maintain the flow of water and glycol at the condenser inlet.
3. Remove the stator from the expansion valve and open the valve
manually using the magnet provided
4. Carefully empty the system through the suction line pressure port (Fig.
2.i, 22)
4.10 Commissioning checklist
For details on the parameter settings and SW functions in
general, see the controller 0300145EN
For correct installation and commissioning of the unit, the recommended
steps are as follows:
1. Make sure that the "Water Connections" have been carried out as
described in paragraph 4.1.
2. Make sure that the "Refrigerant Connections" have been carried out as
described in paragraph 4.3, specifically:
• make sure the safety valve is correctly discharged.
• make sure the refrigerant connections have been made using
the required diameters, as specified in paragraph 2.11 and the
corresponding tables.
3. Make sure that the “Electrical Connections” have been carried out as
described in paragraph 4.4.
4. Make sure that there is at least one display kit available (see paragraph
2.3)
If wanting to use the interface via smartphone app, or
computer with the SW tool, see the control manual
+0300145EN)
5. Make sure that the condenser cooling system (water loop) is correctly
installed and operational.
6. Make sure there is the correct water flow through the water
connections on the unit;
7. Connect the display terminal to position 60 in Fig. 2.j.
8. For multi-evaporator systems, each controller must have its own
display for interfacing via smartphone app, while a PC can be used to
control the entire system via the main controller (after having correctly
set the addresses).
9. For multi-evaporator configurations only:
• Check the correct connection of the stators on all the expansion
valves (main and secondary).
• Check the correct connection of the RS485 serial line between the
main and its secondary controllers.
10. Only when using a multi-evaporator system, make sure that:
• Each secondary unit has the correct address set for the RS485
main/secondary network. If using the smartphone app, a display is
required for each secondary unit.
• The number of evaporators is set on the main unit
• On each main and secondary unit in the same multi-evaporator
network, make sure to set the capacity of the evaporator that each
controller refers to.
11. Make sure that the amount of refrigerant and oil charge complies with
the specifications in paragraph 4.6.
12.
Make sure the unit parameters have been set correctly,
as shown in the instructions in the controller manual
(+0300145EN).
13. If a supervisor is installed, make sure the serial network has been
properly connected and all the devices respond to the supervisor.