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KEY DIFFERENCES FROM
CONVENTIONAL
HEATING
SYSTEMS
Mitsubishi Ecodan Air Source Heat Pump
• Is to be mounted external to the property in a suitable location
using the detail provided in the manual and with a minimum
distance of 300mm from the nearest wall.
• Cold air is blown from the front of the unit - it should be
positioned in a location where this will not cause a nuisance.
• It should be mounted on the anti-vibration mounts provided
with the kit.
• The anti-vibration flexible hoses should be fitted to the flow
/return pipework.
• Under some operating conditions, condensate water may be
produced which will drain away from the unit. If this is likely
to cause a problem (eg. due to freezing on a pathway), we
suggest incorporating a 150mm wide by 50mm deep gravel
filled channel as a soakaway, or a similar arrangement to suit
the location.
• The external flow / return pipework needs to be insulated and
waterproofed to prevent freezing.
• A 25A power supply is needed with a local external isolator
fitted in accordance with IEE wiring regulations.
Incoming Water Supply
• As the performance of hot and cold water systems is totally
reliant on the incoming mains cold water supply, check that
the pressure will be a minimum of 2 bar at times of maximum
simultaneous use and that the flow rate is a minimum of 30
litres/minute. (For optimum performance this will need to be
50 litres in larger properties.)
Hard Water Considerations
• A factory fitted scale inhibitor
can be provided and should be
specified at the time of order
for hardness levels above 200
and up to 300 ppm(mg/l). Where
the water is very hard ie above
300 ppm (mg/l) an optional
polyphosphate type inhibitor
should be ordered and fitted
separately by the installer.
Special Considerations In
Retrofit Situations
• The heat exchanger in the
heat pump must be protected
from particulate contaminates
in the water circuit. When
fitting in a retrofit situation
the existing radiator circuit
MUST be chemically cleaned
and thoroughly flushed by
a competent person before
installation.
Page 4
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