Commissioning; System Commissioning Procedure - Mitsubishi Electric ecodan PUHZ-W50VHA2 User Manual

COMMISSIONING

System Commissioning Procedure

Ensure that anti-freeze and inhibitor is added to the
primary loop at a concentration as recommended by the
manufacturer, all pipework must be fully insulated
between tank and outdoor unit. The outdoor unit should
be left in standby for 12 hours before first time start up
to prime the compressor.
Once the above period is over, turn on the power to the
control equipment and initiate a constant demand for
both hot water and heating modes through the 2 channel
Fig. 5.0
time clock, make sure the room thermostat is up fully
and the cylinder sensor (TH5) is inserted into the pocket
and the target temperature is programmed to no more
than 55°C.
Check that the hot-water zone valve is the only one
energised and the system circulators are running. With
the circulating pumps running check the flow rate on the
flow setter valve falls within the requirements for the
model shown in table 1.1 (page 10). The PAR-W21MAA
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controller should at this point indicate hot-water heating
in the top left as shown in Fig.5.0 It should also show the
current cylinder temperature as a small figure in the
centre and the cylinder target temperature to the left Fig.
5.1in hot water heating this should have been set to 55°C
as detailed in the previous section.
Fig. 5.1
As the flow from the heat pump raises in temperature
the actual cylinder temperature will slowly increase until
Target Cylinder Actual
it meets the target. Hot-water heating will NOT cease
Temperature Temperature
until the cylinder sensor temperature is satisfied.
(Not to Exceed 55 o C)
Once the cylinder thermostat is satisfied make a note of
the time period the heat pump has taken to recover the
whole cylinder. At this point the hot-water mode
indication on the PAR-W21MAA remote will change to
dependent on the ambient temperature Fig. 5.2. To
override this for commissioning purposes the boost heat
switch can be turned ON to target a higher flow
temperature. Typically the heating temperature to be
o o
targeted in this mode will be 50 C to 55 C. With heating
mode initiated, using the setter valve, check the flow
rates are in the required band for the heat pump model.
The heating system must be correctly balanced to ensure
correct flow through every radiator. If the system has
Fig. 5.2
two heating zones check that both zone valves operate
independently.
Target Actual
Temperature Temperature
50
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