Setting The Atc Controller - Grant Aerona HPAW65 Installation & User's Instructions

11 Commissioning

11.2 Setting the ATC Controller

The main purpose of the ATC controller
is to give an overall maximum
temperature control over the heat
pump. In contrast, the BTC controller
will give accurate control over both CH
and HW temperatures, even if they
each have different target temperatures.
The ATC controller must be set to
either OFF or AUTOMATIC as follows:
1. OFF – This is indicated when NO
temperature reading is shown in
central section of the display.
In this setting the heat pump will
not operate irrespective of any
demand from either the heating
system controls or the BTC
controller.
Note – either the
symbol will still be visible at the top
of the display and the time will be
shown at the bottom.
If the symbol is visible, press
the M button to switch to
To switch heat pump ON
Press the button.
The return water temperature will
appear on the display and the heat
pump will start.
To switch the heat pump OFF
Press the button.
The return water temperature will
disappear from the display and the
heat pump will stop.
2. AUTOMATIC – This is indicated
when the symbol is visible at
the top right of the display.
In this setting the heat pump is in a
fully automatic condition (provided it
is switched ON – see 1 above).
Functions including normal running,
defrosting, and frost protection are
all operative.
IMPORTANT
If the symbol is visible at the
top left of the display the Frost
protection and Back-up Immersion
heater will NOT operate. Do NOT
leave the ATC control set in this
condition. Press the M button to
switch to 'Automatic' and the
will be visible at the top right
30
of the display.
Note – It is possible to switch from
to
switched OFF by pressing the M
button.
Setting the ATC clock function
For the heat pump to operate
correctly, the clock function of the
ATC must be correctly set using
the following procedure:
1. Press the 'SET' button twice. The
hour segments will flash. Alter the
hour setting using the
2. Press the 'SET' button again to set
the minutes. Alter the minute setting
using the
3. Press the 'SET' button to confirm
the time setting.
4. The clock is now set.
or
Setting the ATC parameters:
In order for the heat pump to
operate correctly, the ATC
operating parameters must be set
as indicated in the table on page 31.
.
IMPORTANT
Please note that ALL operating
parameters MUST be checked
during commissioning and, if not
correct, set to the the value
given in the table on page 31.
Incorrectly set parameters will
adversely affect the operation and
efficiency of the heat pump and
will invalidate all warranties.
To check the parameter settings,
press either of the
enter the list of parameters. Then
repeatedly press either of the
buttons to scroll through the
different parameters. Check the
setting of each parameter against
the correct values listed in the
table on page 31.
To alter the setting of any parameter,
press the 'SET' button once, then
use the
value of that parameter. Once set
correctly, press the 'SET' button to
exit back to the parameter list and
continue to check settings.
To exit the parameter list stop
pressing the
will automatically return to the
normal operation.
when the ATC is
buttons.
buttons.
buttons to
buttons to alter the
buttons. The ATC
!
NOTE
If no button is pressed for a period
of 10 seconds, the ATC will
automatically revert back to normal
operation.
ATC timer function
In order for the heat pump to
operate correctly the ATC timer
function MUST be switched off.
If the 'ON' and 'OFF' indicators are
NOT showing on the display, then
the timer function is already
switched off and no further action is
required.
If the 'ON' and 'OFF' indicators are
showing on the display:
Press the button and then the
'SET' button. The 'ON' and OFF'
will disappear from the display
indicating that the timer function
has been switched off.
Fault finding
The ATC also has a series of fault
codes which will help in any fault
diagnosis, should an internal fault
occur. Refer to Section 13.3 for
details.
Figure 11-1: ATC display and buttons
!
NOTE
If the is flashing on and off, this
indicates that the heat pump is in the
defrost mode.