Commissioning; Heat Meter - IDEAL LOGIC HIU Direct MT Installation And Servicing

50 COMMISSIONING

FILLING THE CENTRAL HEATING SYSTEM
1. Check all the pipework and electrical connections are
made correctly.
2. Connect the filling loop provided.
3. Open the central heating isolation valves.
4. Open the DHW main inlet isolation valve & the filling loop
inlet valve allowing water through the filling loop into the
CH system.
5. Pressurise the CH system to the desired pressure 1.2 to 2
bars. (Not higher than the maximum operating pressure of
2.5 bars) (Vent the system and refill if required).
6. Isolate the DHW inlet supply using the DHW inlet isolation
valve. (valve has a back flow preventer fitted).
7. Check the Central Heating system (CH) for leaks.
8. Remove the filling loop and store in a suitable place for
future requirements.
9. Open mains inlet connection to draw hot water supply
(DHW).
10. Open DHW outlet isolation valve & a utility tap, draw off
enough water to remove the air from the HIU and connect
pipe work.
11. Check for leaks.
12. After the primary feed system has been correctly purged;
Check to ensure to ensure the pressure is not greater
than the maximum pressure specified for these units and
the system does not leak.
13. Open the Primary flow slowly.
14. Open the Primary return.
15. If no leaks are present, turn on the electrical supply to the
unit. This will activate the control valves and allow the
primary water to flow through the HIU unit. Check for any
error signals on the controls unit.
16. Set the CH to the desired maximum temperature using an
electrical screw driver in the top hole under the rubber
cover (top right hand side of the black control box) & the
DHW outlet temperature using the next hole down.
17. Activate DHW via the index (tap furthest away) utility tap.
Check the DHW light is displayed on the control unit.
18. Check primary pressure differential is greater than 0.35Kpa .
19. Check the maximum temperature obtained meets the
requirement.
20. Check the desired flow rate is obtained.
21. Turn off tap.
22. Turn the room stat up and activate the CH circuit, check
the CH light is on and the system achieves the desired
operating temperature and temperature differential
between the flow and return.
LOGIC HIU -
Installation & Servicing / Users
INSTALLATION
50 COMMISSIONING CONTINUED
23. Fit the case on to the unit. Hook the top taps in the cut outs
provide (top left & right) and fit fixing screws through the
case fixing tabs and the mounting case (bottom left and
right) Ensure access doors are functional and operational.
24. If meter is fitted ensure this operates in accordance to the
specified requirement.
25. The system is set up ensure the instruction and filling loop
are left with the customer and they are shown how to use
the HIU unit.
51 HEAT METER INSTALLATION
The HIU is designed to include a compact heat meter.
Before carrying out any maintenance, repair or part
replacement work, proceed as follows:
• Isolate the electric supply
• remove the cover
• close the isolating valves
• empty the HIU using the drain cocks provided
• remove the spacer piece (A)
• remove the blanking plug (B)
• install the flow probe in the 1/4" pocket (B) provided
• install the flow meter on the return pipe.
Please refer to the heat meter technical data sheets for
further information.
A
B
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