Table of Contents
Advertisement
General Commissioning
25
Before Filling
Check and tighten all mechanical joints prior to commissioning. Cap and seal 2
heating zone valve outlet if not in
nd
use to avoid potential leaks on models 180 and above. Check all controllers are commissioned and DIP switches
are set correctly.
Filling The Cylinder
Check the pressure in the expansion vessel is 3 bar (45PSI), i.e. the same as the setting of the pressure reducing
valve. The valve is of the car tyre (Schrader) type. Check all the connections for tightness including any factory made
connections such as the immersion heater and the temperature and pressure relief valve. Before filling open the hot
tap furthest away from the Mitsubishi Electric pre-plumbed cylinder to let air out. Open the cold main isolation valve
and allow the unit to fill. When water flows from the tap allow it to run for a short while to flush through any dirt,
swarf or flux residue. Close the tap and open every other hot tap in turn to purge all remaining air. Check the
cylinder target temperature programmed on the main controller is set to 55ºC.
Filling The Primary Circuit
Ensure the lever on the two port valve(s) is set to the filling position. When full, move the lever back to the auto
position. Switch the main controller to Domestic Hot Water (DHW) mode and allow the cylinder to start to heat,
ensure a complete cylinder heat up is observed and that switchover to heating mode is then tested.
Safety Valve Checks
During heat-up there should have been no sign of water coming from either the expansion relief valve or the
temperature / pressure relief valve. Now hold both of these safety valves fully open allowing as much water as
possible to flow through the tundish. Check that your discharge pipework is free from debris and is carrying the
water away to waste efficiently. Release the valves and check that they reseat properly.
Emitter Circuit
Check Primary flow rate is acceptable for the Ecodan
®
model in question with all zones/circuits open; confirm that
all valves are fully open and that strainers are clear before adjusting pump speed and hence primary flow rate. It
may be necessary to run the system in fixed flow temperature mode during this period to ensure that temperatures
requested can be achieved and maintained.
With radiator systems start to adjust lockshields so that all radiators are balanced and reaching an even
temperature, usually the first radiators on the circuit will become hotter fastest and need their flow rate restricting,
the opposite applies to those radiators further away from the heat source. When commissioning underfloor heating
circuits the balancing is carried out by adjusting the flow rate for each zone at the relevant manifold, the designer
will have specified a required flow rate for each zone which must be adhered to.
Antifreeze
Must be added to the required concentration (20-25%) and must have biocide protection. Mitsubishi Electric can
supply this item in 10 and 25 litre containers (SAP 246670 and SAP 246671).
FTC4 Installation Manual
51
Advertisement
Table of Contents
