24 | © Danfoss | 2022.11
LGB53080
Termix VX-IV - 3 Series DS Fully insulated
Maintenance
The HIU requires little monitoring, apart from routine checks. It is
recommended that you read the energy meter at regular intervals and
write down the meter readings.
Regular inspections of the HIU in accordance with these instructions are
recommended and should include:
Strainers
Cleaning of strainers.
Meters
Checking of all operating parameters, including meter readings.
Temperatures
Check of all temperatures, such as Heat Network Supply temperature
and space heating flow temperature.
Connections
Checking all connections for leaks.
Safety valves
The operation of the safety valves should be checked by turning the valve
head in the indicated direction.
Venting
Check that the system is thoroughly vented.
Spare parts
Spare parts can be ordered from SAV Systems Ltd. Please ensure that any
enquiry includes the HIU's serial number.
The serial number is found on the unit label.
Authorised personnel
All troubleshooting and maintenance may only be carried out
by an authorised and qualified HVAC or electrical technician.
In the event of malfunction, check the following before initiating
troubleshooting:
• That there is a power supply to the HIU.
• That the strainer on the Heat Network pipe has been cleaned.
• That the Heat Network flow temperature is normal.
• That there is sufficient differential pressure.
Measures AFTER troubleshooting
Once the troubleshooting has been completed, undertake
the following measures:
• Tighten all union connections.
• Wipe off the HIU and clean up any fluid spills.
• Balance the HIU if necessary.
• Check that pressure and temperature are at normal levels.
Troubleshooting
Authorised personnel
All troubleshooting and maintenance may only be carried out
by an authorised and qualified HVAC or electrical technician.
