- 18 -
- 19 -
6 .15
Controller overview
The pressurisation unit controller is designed to be intuitive to use and allows
functions and alarms to be set by the installer/user .
The functions are set using the 3 buttons (A, B, & C) on the front of the
controller and with the help of on screen prompts via the back lit LCD display .
On the front of the APU a green ‘power on’ light will be displayed whilst the
unit is powered . If an alarm or error is raised the red ‘Error’ light will be
displayed .
A number of pressure set points can be set using the menus, these set points are
detailed below, 1 to 4 and in the description of the function .
Button A Enters menus or selects values .
Button B Scrolls down through menus or reduces set values .
Button C Scrolls up through menus or increases set values .
6 .16
Function list & explanation
The functions are contained within an initial display and a settings menu .
6 .17
Initial display
On start up, and during normal operation, if the APU has had no button inputs
for 1 minute, the system pressure will be displayed (see Section 7 .11) .
6 .18
Setting of APU Mini see Fig . 19
To access the setting of the APU Mini see the following procedure:
1 Press and hold button A for 5 seconds .
2 P1 will be displayed and the red Error light will slowly flash . See Fig . 20 .
3 Using buttons B & C select the P function required .
4 Press button A to enter the function .
5 Using buttons B & C increment the value required up and down .
6 Press button A to confirm setting .
7 Press and hold button A until the red Error light stops flashing and the APU
Mini reverts to normal operation . This operation will save the changed
values .
P1 System pressure (2)
see Fig . 18
Sets the required system pressure. Set in 0 .1 bar
increments up to the maximum set value for the APU model .
APU 130 & 230, 3 .0 bar max .
P2 Differential pressure (3)
see Fig . 18
Sets the pressure the APU will turn on at as the system
pressure falls. Relative to the set system pressure. Set in
0 .05 bar increments below the System pressure (2), cannot
be set above 0 .1 bar below the System pressure (2) .
P3 Hi Alarm (1)
see Fig . 18
Sets high system pressure alarm. Set in 0 .05 bar increments
above the System pressure (2) . Cannot be set below System
pr 0 .5 bar . Alarm auto resets when system pressure
is reduced below alarm level .
If no button inputs are received within 1 minute the APU Mini will revert to
normal operation and the red Error light will stop flashing .
Note – Pumps do not operate when in the setting menu .
The following functions can be set and modified:-
TIME
PR
ESSU
R
E
HIGH ALARM SET VALUE (1)
LOW ALARM SET VALUE (4)
SYSTEM PRESSURE SET VALUE (2)
DIFFERENTIAL SET VALUE (3)
PUMP 'OFF'
PUMP 'ON'
NORMAL OPERATION
SY
ST
EM
PR
ES
SU
RE
Fig . 18
Fig . 19
A
B
C
Fig . 20
A
B
C
