Refrigerant Commissioning
Refrigerant Schematic Diagram
Evacuation and Charging Connections
Evacuation, Charging and Refrigerant Procedures
After completing the refrigerant connections the following steps should be followed with reference to the Evacuation and Charging
Connections above.
❏
Service gauges - Connect the low pressure port (1) of a manifold gauge set to the suction line outdoor unit shut off valve service port (2).
❏
Vacuum Pump - Connect the centre line port (3) of the manifold gauge set to the vacuum pump (4) and operate the pump to ensure
a vacuum of 200 microns.
❏
Ensure gauge low pressure port (5) is open and high pressure port (6) is closed.
❏
System Isolation - After achieving the specified system vacuum close the gauge low pressure port (5) and switch off the vacuum
pump. Leave the system for 1 hour and check that the vacuum is maintained. If not, check for leaks, rectify and repeat the pumping
down to 200 microns.
❏
Refrigerant Charging - Open both the outside unit shut off valves (7 & 8) to release the factory refrigerant into the system. Weigh in
the site top-up charge using a charging station and any additional extended pipe run charge as detailed in the table above.
❏
Disconnect the vacuum pump and connect the gauge high pressure port (9) to the discharge line of the outdoor unit shut off valve
(10), ensuring that the gauge central port (3) is closed. Run the system, allow pressures to stabilise and ensure correct operation.
After final commissioning remove the gauge set, fit all valve caps and carry out a final refrigerant leak test.
Eaton-Williams
Low Temperature DX Cassette
Page 13
QLC/ICU
Document 0412124
Issue 2.1 05/06
GAS
LIQUID/GAS MIXTURE
LIQUID LINE
B
D
C
A
OUTDOOR UNIT
INDOOR UNIT
D
C
B
A
Compressor
Indoor Expansion Device
Outdoor Coil
Indoor Coil
AC UNIT
3
6
9
4
8
2
7
5
1
High Pressure
Gauge
Low Pressure
Gauge
Site Top-up and Extended Pipe Run
Refrigerant Charge (R407C)
QLC10 /
ICU40(3)
QLC15 /
ICU55(5)
QLC20 /
ICU80(7)
Site Top-up Charge
(cooling only)
150
0
0
Extended Pipe
Run Charge > 5m
25 gms/m
25 gms/m
40 gms/m
Factory Base Charge
for A/C Unit (5m)
1100 gms
1600 gms
1900 gms
