Weather Compensation - Mitsubishi Electric ecodan PUHZ-W50VHA2 User Manual

Weather compensation:

These are used for variable operating conditions. At cooler outdoor temperatures the flow temperature will be hotter;
while warmer outdoor temperatures provide very little heating. A cut-off temperature will not provide any heating. These
available when Heating ECO mode is activated, this is a far more efficient way to operate Ecodan.
The recommended settings are listed within table below.
PAR-W21MAA: Recommended
Settings (Heating Eco mode)
Low-ambient
(No.1)
High-ambient
(No.2)
FLOW TEMP.
40°C
30°C
Heat Emitters (Radiators/Under-floor heating)
Please note that heat pumps provide lower flow temperatures to radiators than a conventional gas boiler. Rather than the
radiators turning on/off locally as with a gas boiler, heat pumps provide a more consistent lower flow temperature which allows
for more efficiency and greater comfort.
Please note the temperature given are for guidance only. The flow temperatures required will vary on the construction of the
radiators or under-floor heating system as well as the heat load of the room/house. The installer should set-up the system to
these temperatures but they can be altered later on if required. Fine tuning of the operating conditions of the Ecodan unit can
reduce your energy bills, dropping just the flow temperature 1°C can make a difference to the bill.
* To avoid damage to timber floors it is advised to check with underfloor heating manufacturers flow temperatures.
Throughout the system set-up buttons on the controller are referenced by letters and displays by numbers ; this key can be found on page 41
46
SYSTEM SET -UP
Factory Settings
Ambient
Under-floor
-10°C
Radiator
Under-floor
17°C
Radiator
Low Ambient (No.1)
High Ambient (No.2)
-2°C 17°C
Example Settings
Flow Ambient Flow
-2°C 40°C
38°C
-2°C 45°C
15°C 30°C
25°C
15°C 35°C
Higher efficiencies hence lower running
costs are achieved with lower flow
temperatures.
The temperatures should be set by the
commissioning engineer in accordance with the
system design and the buildings thermal
properties.
OUTDOOR
Fig.4.5
TEMP.
45
Table 3.0