Switch Setting Of Ftc2; Automatic Change-Over Mode; Legionella Prevention Mode; Heating And Heating Eco Mode - Mitsubishi Electric ecodan PUHZ-W50VHA2 User Manual

Heating and Heating ECO mode.

Choice of either Heating or Heating ECO mode is made using the PAR-W21MAA or local controller. Both modes uses the
Ecodan to heat the water to the set point (THE) and then allow for the use of Booster heaters if present on the heating circuit to
raise the space heating flow temperature (TH1) if needed, however radiators should ideally be sized for lower flow temperatures
in order to maximise system performance. There is a 1 minute delay before the Ecodan starts, so that the water circulation pump
starts running earlier than the Ecodan

Legionella Prevention Mode

It is recommended that sanitary hot water stored in tanks is heated periodically to 60°C or above for the prevention of legionella.
In legionella prevention mode, the system runs to let the temperature in the domestic hot water tank (TH5) reach TLP °C. The
temperature TLP can be set using Dip SW2-6. Provision for legionella prevention should be made in order to comply with the
relevant regulations.
The 65°C setting can NOT be selected when there is no heater in the domestic hot water circuit, Dip SW settings as follows:
SW1-4 OFF and SW1-5 ON
START CONDITION AND FINISH CONDITIONS
How often the legionella prevention operation is activated by using Dip SW2-4 and 2-5.
Emergency (electric heater only) mode
comes first in any operation mode, except in Emergency mode In the Emergency mode, the heater is switched ON without
Emergency mode can be activated when the system has external input (IN1) or if Dip SW3-7 is manually switched to ON.
START CONDITION
Emergency mode will start when one of the following conditions is met;
A) The system has external input (IN1) this can be energised by shorting terminals 1&2
B)
SW3-7 is ON
Automatic change over mode
When a system includes a domestic hot water tank and a space heating requirement automatic change over mode should be
selected. Selection is made with Dip SW1-8. If the system does not include a DHW tank Dip SW1-3 is ON and Automatic change
over mode is invalid. It is possible to control the domestic hot water with a time clock (as with FTC1) by turning automatic
change over mode off.

Switch setting of FTC2

The functionality of the Ecodan is determined by the setting of the dip switches from SW1 to SW3, and SW6 found on the FTC2
controller, a summary of switch settings is shown on the next page.
Altering the factory DIP switch settings may compromise the units functionality unless their effects are fully understood.
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INSTALLATION: FTC2
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Fig. 4.0