HTW IX39B5 Serie Manuel D'installation page 80

INSTALLATION MANUAL
7. AIR EVACUATION
6. Close the Low Pressure side of the manifold gauge, and turn off the vacuum pump.
7. Wait for 5 minutes, then check that there has been no change in system pressure.
8. If there is a change in system pressure, refer to the Gas Leak Check section for information on how
to check for leaks. If there is no change in the system pressure, unscrew the cap from the packed
valve (high pressure valve).
9. Insert hexagonal wrench into the packed valve (high pressure valve) and open the valve by turning
the wrench in a 1/4 counterclockwise turn. Listen for gas to exit the system, then close the valve
after 5 seconds.
10. Watch the Pressure Gauge for one minute to make sure that there is no change in pressure. The
Pressure Gauge should read slightly higher than atmospheric pressure.
11. Remove the charge hose from the service port.
Flare nut
Valve
body Valve stem
12. Using hexagonal wrench, fully open both the high pressure and low pressure valves.
13. Tighten valve caps on all three valves (serviceport, high pressure, low pressure) by hand. You may
tighten it further using a torque wrench if needed.
OPEN VALVE STEMS GENTLY
When opening valve stems, turn the hexagonal wrench until it hits against the stopper. Do not try to
force the valve to open further.
NOTE ON ADDING REFRIGERANT
Some systems require additional charging depending on pipe lengths. The standard pipe length varies
according to local regulations. For example, in North America, the standard pipe length is 7.5m (25'). In
other areas, the standard pipe length is 5m (16'). The refrigerant should be charged from the service port on
the outdoor unit's low pressure valve. The additional refrigerant to be charged can be calculated using the
following formula:
Connective Pipe
Length (m)
< Standard pipe
length
> Standard pipe
length
DO NOT mix refrigerant types.
CAUTION
78

Cap
Fig. 6.2
ADDITIONAL REFRIGERANT PER PIPE LENGTH
Air Purging Method
Vacuum Pump
Liquid Side: Ø 6.35 (ø 0.25")
Vacuum Pupm (Pipe length – standard
(Pipe length – standard
Additional Refrigerant
N/A
R32:
length) x 12g/m
length) x 0.13oZ/ft
SPLIT 1X1
Liquid Side: Ø 9.52 (ø 0.375")
R32:
(Pipe length – standard
length) x 24g/m
(Pipe length – standard
length) x 0.26oZ/ft
IX39B5