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Mitsubishi Electric Hydrobox EHSC Series Installation Manual page 30

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5
System Set Up
Service Menu
The service menu provides functions for use by installer or service engineer. It is NOT intended the home owner alters settings within this menu. It is for this reason
password protection is required to prevent unauthorised access to the service settings.
The factory default password is "0000".
Follow the procedure described in General Operation for the set up operation.
Many functions can not be set whilst the indoor unit is running. The installer should turn off the unit before trying to set these functions. If the installer attempts to change
the settings whilst the unit is running the main remote controller will display a reminder message prompting the installer to stop operation before continuing. By selecting
"Yes" the unit will cease operation.
<Manual operation>
During the filling of the system the primary circuit circulation pump and 3-way valve can be manually
overridden using manual operation mode.
When manual operation is selected a small timer icon appears in the screen. When selected, this
function will only remain in manual operation for a maximum of 2 hours. This is to prevent accidental
permanent override of the FTC.
►Example
en
Pressing F3 button will switch manual operation mode ON for the main 3-way valve. When filling of the
DHW tank is complete the installer should access this menu again and press F3 to deactivate manual
operation of the part. Alternatively after 2 hours manual operation mode will no longer be active and
FTC can resume control of the hydrobox.
Manual operation and heat source setting can not be selected if the system is running.
A screen will be displayed asking the installer to stop the system before these modes
can be activated.
The system automatically stops 2 hours after last operation.
<Floor dry up function>
The Floor dry up function automatically changes the target hot water temperature
in stages to gradually dry concrete when this particular type of underfloor heating
system is installed.
Upon completion of the operation the system stops all the operations except the
Freeze stat. operation.
For Floor dry up function, the target flow temp. of Zone1 is the same as that of
Zone2.
Functions
Floor dry up function
Flow temp. increase step
Flow temp.
(increase)
Increase interval
Flow temp.
Flow temp. decrease step
(decrease)
Decrease interval
Start & Finish
Max. target temp.
Target temperature
Max. temp. period
<Password protection>
Password protection is available to prevent unauthorised access to the service
menu by untrained persons.
Resetting the password
If you forget the password you entered, or have to service a unit somebody else
installed, you can reset the password to the factory default of 0000.
1. From the main settings menu scroll down the functions until Service Menu is
highlighted.
2. Press CONFIRM.
3. You will be prompted to enter a password.
4. Hold down buttons F3 and F4 together for 3 seconds.
5. You will be asked if you wish to continue and reset the password to default set-
ting.
6. To reset press button F3.
7. The password is now reset to 0000.
<Manual reset>
Should you wish to restore the factory settings at any time you should use the
manual reset function. Please note this will reset ALL functions to the factory de-
fault settings.
29
Symbol
Description
Set the function to ON and power on the system using the main remote
a
controller, and the dry up heating operation will start.
b
Sets the increase step of the target flow temperature.
c
Sets the period for which the same target flow temperature is maintained.
d
Sets the decrease step of the target flow temperature.
e
Sets the period for which the same target flow temperature is maintained.
f
Sets the target flow temperature at the start and the finish of the operation. 20 - 60
g
Sets the maximum target flow temperature.
Sets the period for which the maximum target flow temperature is main-
h
tained.
Selected
Manual operation menu screen
Target flow temp.
(°C )
(h)
45
(g)
40
35
(b)
(c)
30
(f)
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Days
• This function is not available when a PUHZ-FRP outdoor unit is connected.
• Disconnect wiring to external inputs of room thermostat, demand control, and
outdoor thermostat, or the target flow temperature may not be maintained.
Password input screen
Password verify screen
Running
Error
indication
(d)
(e)
Option/Range Unit
Default
On/Off
Off
+1 - +10
ºC
+5
1 - 7
day
2
−1 - −10
ºC
−5
1 - 7
day
2
ºC
30
20 - 60
ºC
45
1 - 20
day
5

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