Daikin FDMQ-R Series User Manual

172
FTX-N/U, FVXS-N, FDMQ-R Series EDUS091558E
3P379970-10C
7
Outdoor Unit Installation
5. Pressure test and evacuating system
WARNING
• Donotmixanysubstanceotherthanthespeciedrefrigerant(R410A)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
speciedtighteningtorque.
Compound
pressure gauge
Pressure
meter
High-pressure
valve
Low-pressure
valve
Vacuum pump
Service port
Liquid
stop
valve
Valve caps
Gas stop valve
Charging
hoses
Gauge
manifold
1) Pressurize the liquid pipe and gas pipe from the service ports of each stop valve to 550psi (3.8MPa) (do not pressurize
more than 550psi (3.8MPa)) 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 hose to the gas stop valve’s service port.
3) Fully open the gauge manifold’s low-pressure valve (Lo) and completely close its high-pressure valve (Hi).
(High-pressure valve will require no further operation.)
4) Evacuatesystemusingvacuumpumptobelow500micronsfor1hourminimum.
5) Close the gauge manifold’s low-pressure valve (Lo) and stop vacuum pump.
(Maintain this condition for a few minutes to make sure that the compound pressure gauge pointer does not swing
back.)*
1
6) Remove the valve caps from the liquid stop valve and gas stop valve.
7) Turntheliquidstopvalve’srod90°counter-clockwisewithahexagonalwrenchtoopenthevalve.
Close it after 5 seconds, and check for gas leakage.
Usingsoapywater,checkforgasleakagefromtheindoorunit’sareandoutdoorunit’sareandvalverods.
After the check is complete, wipe all soapy water off.
8) Disconnect the charging hose from the gas stop valve’s service port, then fully open the liquid and gas stop valves.
(Do not attempt to turn the valve rod further than it can go.)
9) Tightenthevalvecapsandserviceportcapsfortheliquidandgasstopvalveswithatorquewrenchtothespecied
torques.
Refer to “4. Refrigerant piping” on page 6 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).
01_EN_3P379970-10C.indd 7 10/18/2019 9:18:00 AM

Daikin FDMQ-R Series Specifications

General

Brand	Daikin
Model	FDMQ-R Series
Category	Air Conditioner
Language	English