Mitsubishi Electric PAC-IF032B-E Installation And Operation Manual page 21

5. Dip switch setting
5.4.2. DHW mode setting
Set Dip SW 2-1 to set DHW max. temparature drop (Difference in temperature be-
tween DHW max. temperature (Desired temperature of stored hot water) and the
temperature at which DHW mode restarts).
Dip SW 2-1 Setting
OFF 10 deg
ON 20 deg
Set Dip SW 2-2 to operation in DHW mode.
Dip SW 2-2 Setting
OFF Eco
ON Normal
DHW mode can run in either 'Normal' or 'Eco' mode. Normal mode will heat the
water in the DHW tank more quickly using the full power of the heat pump. Eco
mode takes a little longer to heat the water in the DHW tank but the energy used is
reduced. This is because heat pump operation is restricted using signals from the
FTC2B based on measured DHW tank temperature.
Set Dip SW 2-7 to set immersion heater usage in DHW mode.
Dip SW 2-7 Setting
OFF Used
ON Not used
Set Dip SW 2-9 to set booster heater usage in DHW mode.
Dip SW 2-9 Setting
OFF Used
ON Not used
5.4.3. Legionella prevention mode setting
Set Dip SW 2-4 and 2-5 to set how often the Legionella prevention operation is
activated.
SW 2-4 SW 2-5
OFF OFF Activate every "1 times" DHW operations.
ON OFF Activate every "15 times" DHW operations.
OFF ON Activate every "150 times" DHW operations.
ON ON Activate by IN2.
Set Dip SW 2-6 to set Legionella prevention hot water (Desired temperature of
stored hot water).
Dip SW 2-6 Setting
OFF 60°C
ON 65°C
The 65°C setting can not be selected when there is no heater in the DHW circuit,
Dip SW settings is as follows;
SW1-4 OFF and SW1-5 ON, SW1-4 OFF and SW1-5 OFF and SW2-9 ON. And
when the heat pump max. outlet water temperature is 55°C (SW1-10 OFF), le-
gionella prevention mode is not available.
5.5. Manual operation
When the system is installed, the whole circuit must be filled with water. At this
stage, water circulation pump and 3-way valve shall be operated individually.
Water circulation pump operates according to Dip SW 3-2 setting.
Dip SW 3-2
OFF Water circulation pump is OFF.
Water circulation pump is ON.
ON
(It is switched OFF after 60 minutes consecutive operation.)
3-way valve operates according to Dip SW 3-3 setting.
Dip SW 3-3
OFF 3-way valve is OFF.
3-way valve is ON.
ON
(It is switched OFF after 60 minutes consecutive operation.)
* NOTE
Even if you forget to reset the Dip SW settings above, the normal operation mode
can be recovered automatically in 0 minutes.
Setting
Operation
Operation
5.4.4. Heating / Heating ECO / Cooling / Holiday mode setting
Set Dip SW 2-3 to set economy setting for water circulation pump in Heating and
Heating ECO and Cooling mode.
Dip SW 2-3 Setting
OFF Inactive
ON Active
When the setting is inactive, the water circuit pump is always ON. When the set-
ting is active, the water circulation pump stops 5 mins. after the heat pump has
stopped, then starts operating again after 3-minutes stop. After 1 minute, the water
circulation pump stops again. Then water circulation pump repeats 3-mins OFF →
1-min. ON → 3-mins OFF.
Set Dip SW 2-8 to set booster heater usage in Heating and Heating ECO and Holi-
day mode.
Dip SW 2-8 Setting
OFF Used
ON Not used
Set Dip SW 3-1 to set 3-way valve control during defrost in Heating and Heating
ECO and Holiday mode.
Dip SW 3-1 Setting
OFF OFF (Heating circuit)
ON ON (DHW circuit)
5.4.5. Other setting
Set Dip SW 3-4 to set the room thermostat input (Ana.IN1) logic.
Dip SW 3-4 Setting
OFF Comp. OFF at thermostat short
ON Comp. OFF at thermostat open
Set Dip SW 3-6 to set the flow switch input (IN3) logic.
Dip SW 3-6 Setting
OFF Failure detection at short
ON Failure detection at open
5.. Emergency mode
The emergency mode is available when a failure on the outdoor unit of the heat
pump or a communication error occurs.
This mode uses booster heater or immersion heater as a heat source and automat-
ically controls between the DHW mode and the heating mode. When the system is
not incorporated with heater, the emergency mode is not available.
Emergency mode can be started by following two ways.
1) Dip switch
Before starting the emergency mode, turn off the outdoor unit and FTC2B, and then
turn Dip SW3-7 to ON. Then, turn on FTC2B to start the emergency mode. FTC2B
can be power-supplied by the outdoor unit.
If emergency mode is no longer required, please turn off both outdoor and indoor
unit power supply before returning Dip SW3-7 to OFF position.
2) External input (IN1)
If you switch external input (IN1) to ON, emergency mode will start.
If emergency mode is no longer required, you can resume to normal operation with
switching external input (IN1) to OFF (TB142 1-2 open).
Please turn off both outdoor and indoor unit power supply before switching external
input (IN1) to OFF.
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