15
Mains Supply
The mains supply needs to be protected by a 5A fuse and a double pole switch so that the unit can be safely disconnected
for servicing.
Fitting of the Heat Meter
The heat meter is optional and can be fitted by replacing the spool piece. Details will be found in the meter documentation.
System Testing
Finally test the system to ensure it is operating properly. This can only be done if the primary heat network is running
and the heating controls are wired in and switched on. Ensure that all isolation ball valves at the HIU are open as well as
one domestic hot tap. Hot water should be flowing from the tap in a very short time. To test the heating turn up the room
thermostat and push the override button on the timer get a call for heat. This will activate the HIU delivering heat to the
radiators or the underfloor heating circuit. Make sure that at least one TRV on a radiator or underfloor heating circuit is
open. It will take some minutes to start heating the apartment but the response of the unit can be checked immediately by
measuring the temperature of the primary and secondary flow pipes at the HIU.
Servicing
Service activity needs to be logged in the service record of the unit including date, servicing company and service
engineer‘s name. Any faults recorded need to be rectified immediately. Perfom a functional test of the unit before
proceeding to the next step. Record the findings and rectify any problems before proceeding.
Visual Check
Perform a visual check of the unit making sure all seals are water tight and there are no visible leaks. Any leaks need to be
fixed, union nuts tightened and seals replaced.
Cleaning the Strainers
Close all isolation ball valves and drain all circuits of the unit. Remove the strainer cap, then the strainer and clean the
strainer gauze. Reassemble all strainers, replacing any rubber or fibre seals. Then fill and bleed the entire unit ensuring
there are no leaks.
6. Appendix A
Содержание Meibes A1CX Series
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