Model Selection Data; Electricity Supply; Flow Temperature Controller Location - Mitsubishi Electric ecodan PUHZ-W50VHA2 User Manual

INSTALLATION

Model Selection Data

General
When checking the suitability of the Ecodan it is recommended that heat loss calculations are completed for the
external building fabric plus the ventilation losses, as set out in BS5449:1990. The output of the Ecodan should
then be chosen to meet this demand. Under-sizing of the unit will not provide adequate heat through the coldest
days, while over-sizing will cause the Ecodan to cycle and work inefficiently.
The Ecodan unit has been designed to be incorporated into a conventional heating system, either a vented or
unvented domestic hot water store is required to supply water for showers, sinks etc.
When the Ecodan system is being used to supply domestic hot water, a hot water storage appliance will be
required. The cylinder capacity required needs to be calculated in the correct way set out in BS 6700 / NHBC for
storage cylinders. The cylinder requirements are listed on pages 16 and 21.

Electricity Supply

A mains supply rated to suit the capacity of the Ecodan is required, this must have a means of isolation within one
metre of the appliance itself. The circuit and heat pump should be protected by a 30mA rated RCD. This
appliance MUST BE EARTHED.
All external wiring to the appliance must be in accordance with the latest I.E.E. wiring regulations and any local
regulations which may apply.
The appliance shall be supplied from a suitably rated double pole isolator with a contact separation of at least
3mm in both poles.
In the event of an electrical fault after installation of the appliance, electrical checks must be carried out i.e. Earth
Continuity, Short Circuit, Polarity and Resistance to Earth. The Ecodan MUST BE DISCONNECTED
BEFORE these tests are carried out.
Interconnecting cable for FTC2 no longer carries 240V potential so does not need earth or switching through an
isolator.
Care should be taken not to run communication cables (flow sensor, remote controller cable) close to or with
mains 240 volt cables in order to reduce interference.
Control equipment (pumps, zone valves, thermostats etc) must have a separate circuit from the Ecodan system
and should be protected by the required fuse rating.

Flow Temperature Controller Location

The flow temperature controller should be mounted in a dry area using the mounting holes pre-fabricated in the
steel casing. It is usually installed in an airing cupboard or in a loft space close to the control equipment. The TH5
sensor will need to record a cylinder temperature so should not be further than five metres from the flow
temperature controller. For full installation instructions on installing FTC2 refer to pages 29-40.
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