Mitsubishi Electric EHPT20X-VM2HA, Service Manual

Page: 32 / 76

3
<Manual operation>
During the filling of the system the pump and 3-way valve can be manually over
-
ridden using manual operation mode.
When manual operation is selected a small timer icon appears in the screen. The
function selected will only remain in manual operation for a maximum of 2 hours.
This is to prevent accidental permanent override of the FTC3.
From the service menu use F1 and F2 buttons to scroll through list until Manu
-
al Operation is highlighted.
Press CONFIRM.
Manual operation menu screen is displayed.
To activate manual operation press the function button under the desired part.
To return to service menu press MENU or BACK button.
►Example
Pressing F3 button will switch manual operation mode ON for the main 3-way
valve. When filling of the 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 FTC3 will resume
control of the part.
NOTE:
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 sys-
tem before these modes can be activated.
The system automatically stops 2 hours after last operation.
The OUT13 output of the 2-way valve 2 constitutes an inversion of the OUT4
output of the 2-way valve 1.
1.
.
3.
4.
5.
Manual operation menu screen
System off prompt screen
<Function Setting>
Function Setting allows the setting of auto recovery after power failure only.
1. From the service menu use F1 and F2 to highlight Function Setting.
. Press CONFIRM.
3. Ensure the Ref address and unit number are displayed to the right.
4. Press CONFIRM.
NB Changes can ONLY be made to Mode 1.
6. Use F3 and F4 to highlight either 1/2/3 (see below).
7. Press CONFIRM.
Mode 1 Setting number meanings
1 - Power failure automatic recovery NOT available
2 - Power failure automatic recovery AVAILABLE
(Aprox 4-minute delay after power is restored.)
3 - NO FUNCTION
<Thermistor Adjustment>
This function allows adjustments to be made to the thermistor readings from
-10 – 10 °C in 0.5 °C intervals.
1. From the Service menu highlight Thermistor Adjustment
. Press CONFIRM.
3. Use F1 and F to select thermistor.
4. Press CONFIRM.
5. Use F2 and F3 to change the thermistor temperature.
6. Press CONFIRM.