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Mitsubishi Electric Hydrobox EHSC Series Installation Manual page 29

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5
System Set Up
Legionella Prevention Mode settings (LP mode)
1. Use button F3 to choose legionella mode active YES/NO.
2. To edit the legionella function, press down the MENU button for 3 seconds
and select "hot water", then press F4 key.
3. Use F1 and F2 keys to scroll through the menu selecting each subtitle in turn
by pressing CONFIRM. See the table below for description of each setting.
4. Enter the desired number using the function keys and press CONFIRM.
During Legionella Prevention Mode the temperature of the stored water is in-
creased above 60°C to inhibit legionella bacterium growth. It is strongly recom-
mended that this is done at regular intervals. Please check local regulations for
the recommended frequency of heat ups.
Note: When failures occur on the hydrobox, the LP mode may not function
normally.
Menu subtitle
Function
Hot water temp.
Desired temp. of stored hot water
Frequency
Time between LP mode DHW tank heat up
Start time
Time when LP mode will begin
Max. operation time
Maximum time allowed for LP mode DHW tank heat
Duration of max. temp.
The time period after LP mode desired water temp. has been reached
Initial Settings
From the Initial settings menu the installer can set the following.
• Date/Time *Be sure to set it to the local standard time.
• Language
• Summer time
• Temp. display
• Contact number
• Time display
• ºC/ºF
• Room sensor settings
Follow the procedure described in General Operation for the set up operation.
<Room sensor settings>
For room sensor settings it is important to choose the correct room sensor de-
pending on the heating mode the system will operate in.
Time/Zone schedule setting screen
Please note that LP mode uses the assistance of electric heaters (if present)
to supplement the energy input of the heat pump. Heating water for long
periods of time is not efficient and will increase running costs. The installer
should give careful consideration to the necessity of legionella prevention
treatment whilst not wasting energy by heating the stored water for excessive
time periods. The end user should understand the importance of this feature.
ALWAYS COMPLY WITH LOCAL AND NATIONAL GUIDANCE FOR YOUR
COUNTRY REGARDING LEGIONELLA PREVENTION.
Menu subtitle Description
Room RC zone
When 2-zone temperature control is active and wireless remote
select
controllers are available, from Room RC zone select screen, se-
lect zone no. to assign to each main remote controller.
Sensor setting
From sensor setting screen, select a room sensor to be used for
monitoring the room temperature from Zone1 and Zone2 sepa-
rately.
Control option
(pages 26 - 27)
A
B
C
D
When different
room sensors are
used according to
the time schedule
*1. Not specified (if a locally-supplied room thermostat is used)
Room RC 1-8 (one each for Zone1 and Zone2) (if a wireless
remote controller is used as a room thermostat)
*2. From sensor setting screen, select Time/Zone to make it
possible to use different room sensors according to the time
schedule set in the Select Time/ Zone menu. The room sen-
sors can be switched up to 4 times within 24 hours.
Range
Unit
Default value
60–70
°C
65
1–30
day
15
0:00–23:00
-
03:00
1–5
hour
3
1–120
min
30
Corresponding initial settings room sensor
Zone1
Zone2
Room RC 1-8 (one each
*1
for Zone1 and Zone2)
TH1
*1
Main remote controller
*1
*1
*1
Time/ Zone*2
*1
en
28

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