Daikin 3MXL24WMVJU9 Manual de instalação - Página 11
Procurar online ou descarregar pdf Manual de instalação para Ar condicionado Daikin 3MXL24WMVJU9. Daikin 3MXL24WMVJU9 20 páginas. R410a split series
Imprimir página
5.
Pressure test and evacuating system
WARNING
• Make sure that air or any matter other than refrigerant (R410A) does not get into the refrigeration cycle.
• If refrigerant gas leaks should occur, ventilate the room as soon and as much as possible.
• R410A, as well as other refrigerants, should always be recovered and never be released directly into the environment.
• Use a vacuum pump for R410A exclusively. Using the same vacuum pump for different refrigerants may damage the vacuum
pump or the unit.
CAUTION
It is highly recommended that you do not open/close the stop valves when the outdoor temperature is below −5°F (−21°C) as
this may result in refrigerant leakage.
• When piping work is complete, it is necessary to perform a pressure test
and evacuate system with a vacuum pump.
• If using additional refrigerant, purge the air from the refrigerant pipes and
indoor unit using a vacuum pump, then charge additional refrigerant.
• Use a hexagonal wrench (3/16 inch (4mm)) to operate the stop valve rod.
• All refrigerant pipe joints should be tightened with a torque wrench to the
specified tightening torque.
1) Pressurize the liquid pipe and gas pipe from the service ports of each stop valve to 604psi (4.17MPa) (do not pressurize
more than 604psi (4.17MPa)) for 1 hour minimum, 24 hours recommended. If there is a pressure drop, check for leaks,
make repairs and perform the pressure test again.
2) Connect the gauge manifold's charging hoses to the service ports of each stop valve.
3) Fully open the low-pressure valve (Lo) and the high-pressure valve (Hi) on the gauge manifold.
4) Evacuate system using vacuum pump to below 500 microns for 1 hour minimum.
5) Close the low-pressure valve (Lo) and the high-pressure valve (Hi) on the gauge manifold and stop vacuum pump.
(Maintain this condition for 4-5 minutes to make sure that the compound pressure gauge pointer does not swing back.)*
6) Remove the valve caps from the liquid stop valve and gas stop valve.
7) To open the liquid stop valve, turn the rod of the valve 90° counter-clockwise using a hexagonal wrench.
Close it after 5 seconds, and check for gas leakage.
Using soapy water, check for gas leakage from the indoor unit's flare and outdoor unit's flare and valve rods.
After the check is complete, wipe all soapy water off.
8) Disconnect the charging hoses from the service ports, then fully open the liquid and gas stop valves.
(Do not attempt to turn the valve rods further than they can go.)
9) Tighten the valve caps and service port caps for the liquid and gas stop valves with a torque wrench to the specified
torques.
Refer to "4. Refrigerant piping" on page 9 for details.
*
1
If the compound pressure gauge pointer swings back, the refrigerant may have water content or there may be a loose
pipe joint.
Check all pipe joints and retighten nuts as needed, then repeat steps 3) through 5).
■
English
High-pressure
valve
Compound
Pressure
pressure gauge
meter
Gauge
manifold
Valve
caps
Gas
stop
Low-pressure
valve
valve
Charging
hoses
Vacuum pump
Service port
Liquid
stop
valve
1
10