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7
Water to Water Heat Pump (WTW)
<Auxiliary settings>
This function is used to set the parameters for any auxiliary parts used in the system
Menu subtitle
Function/ Description
Economy settings
Water pump stops automatically a specified period of time from
for pump
when operation is finished.
Delay
Time before pump switches off*1
Electric heater
To select "WITH booster heater (ON)" or "WITHOUT booster
(Heating)
heater (OFF)" in Heating mode.
Delay
The minimum time required for the booster heater to turn ON
after Heating mode has started.
Electric heater
To select "WITH (ON)" or "WITHOUT (OFF)" booster heater or
(DHW)
immersion heater individually in DHW mode.
Delay
The minimum time required for the booster heater or immersion
heater to turn ON from after DHW mode has started. (This setting
is applied for both booster and immersion heater.)
Mixing
Running
Period from valve fully open (at a hot water mixing ratio of 100%)
valve
to valve fully closed (at a cold water mixing ratio of 100%)
control
Interval
Interval (min) to control the mixing valve.
*2
Flow
Minimum The minimum flow rate to be detected at flow sensor.
sensor
Maximum The maximum flow rate to be detected at flow sensor.
*3
*1. Decreasing "time before pump switched off" may increase the duration of stand-by
in heating mode.
*2. Set the running time according to the specifications of the actuator of each mixing
valve.
It is recommended to set the interval to 2 minutes that is a default value. With the
interval set longer, it could take longer to warm up a room.
*3. Do not change the setting since it is set according to the specification of flow
sensor attached to the heat pump unit.
<Heat source setting>
The default heat source setting is heat pump and all electric heaters present in the
system to be operational. This is referred to as standard operation on the menu.
<Operation settings>
Heating operation
This function allows operational setting of flow temperature range from the heat pump unit and also the time interval at which the
FTC collects and processes data for the auto adaptation mode.
Menu subtitle
Flow temp. range
Room temp. control
Heat pump thermo diff.
adjust
Note:
1. The minimum flow temperature that prohibits heat pump operation is 20ºC.
2. The maximum flow temperature that allows heat pump operation equals to the maximum temperature set in the Flow temp.
range menu.
* Fast mode is not efficient and will increase running cost when compared to normal mode.
B-250
Function
Minimum
To minimize the loss by frequent ON and OFF in mild out-
temp.
door ambient temperature seasons.
Maximum
To set max. possible flow temperature according to the type
temp.
of heat emitters.
Mode
Setting for Room temp. control
At Fast mode, target outlet water temperature is set higher
than the one set at normal mode. This reduces the time to
reach the target room temperature when the room tempera-
ture is relatively low.*
Interval
Selectable according to the heat emitter type and the ma-
terials of floor (i.e. radiators, floor heating-thick, -thin con-
crete, wood, etc.)
On/Off
To minimize the loss by frequent ON and OFF in mild out-
door ambient temperature seasons.
Lower limit Prohibits heat pump operation until the flow temperature
drops below the target flow temperature plus lower limit
value.
Upper limit Allows heat pump operation until the flow temperature rises
above the target flow temperature plus upper limit value.
Auxiliary settings menu screen
Range
Unit
Default
20 to 45 ºC
30
35 to 60 ºC
50
Normal/
Normal
Fast
—
10 to 60 min
10
On/Off
On
—
−9 to −1 ºC
−5
+3 to +5 ºC
+5
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