Note On Adding Refrigerant - CANVAC T-Series Installation Manual

AIR EVACUATION
1. Connect the charge hose of the manifold gauge
to service port on the outdoor unit's low-pressure
valve.
2. Connect another charge hose from the manifold
gauge to the vacuum pump.
3. Open the Low-Pressure side of the manifold gauge.
Keep the High-Pressure side closed.
4. Turn on the vacuum pump to evacuate the system.
5. Run the vacuum for at least 15 minutes, or until the
Compound Meter reads -76cmHG (-10 Pa).
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 Gas
Leak Check section for information on how to check
for leaks. If there is no change in 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 counter clockwise turn. Listen
for gas to exit the system, then close the valve after
5 seconds.
10. Watch the Pressure Gauge for one minute or until
the manometer shows slightly above atmospheric
pressure 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.
12. Using a hexagonal wrench, fully open both the high
pressure and low-pressure valves.
ADDITIONAL REFRIGERANT PER PIPE LENGTH
Connective Pipe Air Purging
Length (m) Method
< Standard pipe length Vacuum Pump
> Standard pipe
Vacuum Pump
length
For R32 refrigerant units, the total amount of refrigerant to be added is no more than:
387g(<=9000Btu/h), 447g(>9000Btu/h and <=12000Btu/h), 547g(> 12000Btu/h and <=18000Btu/h).
13. Tighten valve caps on all three valves (service port,
high pressure, low pressure) by hand. You may tighten
it further using a torque wrench if needed.
Valve body
When opening valve stems, turn the hexagonal
wrench until it hits the stopper. Do not try to force
the valve to open further.

NOTE ON ADDING REFRIGERANT

Some systems require additional charging depend-
ing 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'). Refrigerant to be added can be calculated
using the following formula:
DO NOT mix refrigerant types.
Additional Refrigerant
Liquid Side: Ø 6.35 (ø 0.25")
R32:
(Pipe length – standard length) x 12g/m
(Pipe length – standard length) x 0.13oZ/ft
62
Flare nut
Valve stem
fig 6.2
OPEN VALVE STEMS GENTLY
CAUTION
N/A
Liquid Side: Ø 9.52 (ø 0.375")
R32:
(Pipe length – standard length) x 24g/m
(Pipe length – standard length) x 0.26oZ/ft
EN
Cap