Airwell PAC BT Series, Installation And Operating Manual

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6.8 - REFRIGERANT CHARGE CHECK 6.9 - DOMESTIC HOT WATER TANK
The unit always leads the DHW to the setpoint p429 value.
During the
storage (A)
phase the temperature drops until
par 432 (by pwd).
During the
maintenance (M)
phase the temperature drops until
par 431.
It is better to schedule the maintenance phase at night and
during the periods of reduced use of domestic hot water.
If the DHW set point is increased, check that the thermostatic
mixer valve is not set too high.
Example:
If the distance is greater than 5m, add gas and check the
charge.
Proceed as follows to check the charge.
The unit can be in Domestic Hot Water tank mode.
It is important that during the measurements :
- there is enough charge to maintain the unit in
operation
- there are no mode changes (from DHW to the installation
or vice versa)
Turn on the unit
On the multifunction keypad:

Select the required operating mode.

Select required system control
If the water temperature is < 20°C in heating or > 25°C in
cooling, the unit will start late.

Modify the following parameters (by pwd) to allow the unit
operating at the 50% :
396EnManualVcc
= 1
395ManualVcc
= 5,0v

wait at least 15 minutes after unit start up before executing
the readings
NOTE
: the sanitary hot water tap must be opened in
order for the temperature itself in the accumulation to
remain at 30 - 40 °C.

Subcooling calculation :
= temperature read on the high pressure
gauge - temperature detected before the liquid receiver

The correct subcooling is between 1,5 and 2,5 °C

If the values are higher remove gas from the liquid pipe
with unit in operation

If the values are lower add gas, with insufficient charge the
liquid light displays the presence of bubbles.

Wait about 20 minutes to stabilize the unit

Repeat the measure

If necessary add / remove gas

Once reached the optimal charge

Power on/off the unit
6 - START-UP
Scheduling
The scheduling allows to set the daily time bands and to
allocate the destre operating mode :

Ricirculation

Storage
6.10 - ANTI-LEGIONELLA
Enable the function:
Par
435
Enable anti-legionella (1= enable)
Par
436
Antil-egionella set point (password-protected).
*
Programming
↳
Health programming
↳
Prog S1
Monday
HP
*
↳
Settings
↳
Parameters
↳
DHW
p 431
p 432
SET
p 429
A
M
M
A
48°C
45°C
42°C
HP *
↳
Settings
↳
Parameters
↳
Compressor
Ventilation
HP *
↳
Settings
↳
Parameters
↳
DHW
The unit parameters are overwritten by RCW15 keyboard. Make the customization by using RCW15.