Additional Charge; Pump Down (Refrigerant Collecting Operation) - Fujitsu 112 Installation And Operating Manual

Heat pump split single service 3 phase

2 7 3 Additional charge

Length of the connections
Additional charge
The charge in the outdoor units corresponds to the
maximum distances between the outdoor unit and the
hydraulic unit defined in
greater, an additional charge of R410A is required. The
additional charge depends on the distance between
the outdoor unit and the hydraulic unit for each type
of appliance. The additional charge of R410A must
necessarily be made by an approved refrigeration
engineer.
• Example for a heat pump model 160
• Example of additional charge :
An outdoor unit 17 m away from the hydraulic unit will
require an additional charge of :
Additional charge = (17 - 15) x 50 = 100 g.
The charge must be introduced after creating the
vacuum and before the hydraulic unit is filled with gas,
as follows :
- Disconnect the vacuum pump (yellow hose) and
connect a bottle of R410A instead in the liquid
extraction position.
- Open the bottle's valve.
- Bleed the yellow hose by loosening it slightly on the
manifold side.
- Place the bottle on scales with a minimum accuracy of
10 g. Note the weight.
- Carefully open the blue valve slightly and check the
value shown on the scales.
- As soon as the value displayed has dropped by the
value for the calculated additional charge, close the
bottle and disconnect it.
- Then rapidly disconnect the hose connected to the
appliance.
- Proceed to fill the hydraulic unit with gas.
" Warning
• Only use R410A !
• Only use tools suitable for R410A
(set of manometers).
• Always charge in the liquid phase.
• Never exceed the length or the maximum difference
in level.
Gas
Liquid
Figure 22 - Gas bottle R410A
- 20 -
15 m
none
figure 17. If the distances are
R410A
50 g of R410A per additional meter
2 7 4 Pump down
(Refrigerant collecting operation)
Perform the following procedures to collect the refrigerant.
1. Turn OFF the start/stop switch.
2. Remove the front panel. Then turn ON the DIP SW
1 on the interface card.
3. Turn ON the start/stop switch.
(Green and Red LED on the board start flashing ;
1 sec. on / 1 sec. off repeated)
4. The outdoor unit begins cooling operation about 3
minutes after switching ON.
Close the liquid valve on the outdoor unit 1 minute
after operation starts.
5. Close the gas valve on the outdoor unit 1-2 minutes
after closing the liquid valve, while the outdoor unit
keeps running.
6. Disconnect the power supply.
Remarks :
- Make sure to turn OFF the start/stop switch before
touching DIP SW.
- The pump down operation cannot be activated even if
DIP SW is changed while heat pump's power is on.
- Do not forget to turn back DIP SW 1 on the interface
card to OFF, after the pump down operation has been
completed.
- When the pump down operation is repeated, temporarily
turn OFF the start/stop switch after opening the closed
valves (both liquid and gas).
- Then turn ON the start/stop switch again after
2 - 3 minutes and perform the pump down operation.
Figure 23 - Location of DIP switches and diodes
on the hydraulic unit interface card
Installation and operating manual "1364 - EN"
20 m
250 g
Interface card
LED2
(green)
LED1
OFF
DIP SW 1
(red)