16
Commissioning checklist
Checks to be performed
1
Is the heat interface unit properly secured to the wall?
2
Has the system flushing been carried out?
3
Check strainers and clean them if necessary
4
Is the heat meter (if present) connected?
5
Is the heat meter (if present) connected to the building datalogger (if required)?
6
Is the DCW line fitted with a pressure reducing valve?
7
Is the system protected by water hammer arresters?
8
Has the domestic exchanger pre-heating function (normally off) been activated (if required)?
9
Has the modulating temperature regulation with compensated set point (normally off) been
activated (if required)?
10
Is the heat interface unit connected to the 230 V (ac) electric supply?
11
Is the room thermostat (potential-free contact) connected?
12
Has the visual inspection of the HIU internal electrical connections given a positive result and are
the connections compliant with specifications and made in accordance with best practices?
13
Are the shut-off valves open?
14
Has the visual inspection of the hydraulic connections given a positive result?
15
Has the system (primary) been filled and vented?
16
Has the system (secondary) been vented and filled to a pressure of between 1,2 and 2 bar?
17
Is the heat interface unit powered (green “ON” LED lit)?
18
No alarm code (“fault” LED lit) displayed on the heat interface unit regulator?
19
Has the DHW temperature been set to the required value?
(42–50°C recommended)
20
Has the heating flow temperature been set to a correct value?
21
Is the primary circuit at working temperature?
22
Check that “CH” LED lights approx. 10 seconds after the thermostat trips
23
Check that the pump operates correctly on tripping of the thermostat
(check that secondary flow pipes start to heat up)
24
Simulate minimal DHW tapping (approx 3 l/min) and check that “DHW” LED lights and that water
is supplied at the required temperature
25
Simulate abundant DHW tapping and check, by means of the installed heat meter, that the
primary circuit flow rate is sufficiently high
