![background image](http://html.mh-extra.com/html/daikin/3mwks80kv1-3mwks80lv1/3mwks80kv1-3mwks80lv1_installation-manual_501121009.webp)
8
English
Refrigerant Piping Work
Water heater connection pipe
4-2
Connect projection side of charging hose (which comes from gauge manifold) to water heater inlet stop valve’s service
1)
port.
Fully open gauge manifold’s low-pressure valve (Lo) and completely close its high-pressure valve (Hi).
2)
(High-pressure valve subsequently requires no operation.)
Do vacuum pumping and make sure that the compound pressure gauge reads –0.1MPa (–76cmHg).*1
3)
Close gauge manifold’s low-pressure valve (Lo) and stop vacuum pump.
4)
(Keep this state for a few minutes to make sure that the compound pressure gauge pointer does not swing back.)*2
Remove covers from water heater outlet stop valve and water heater inlet stop valve.
5)
Turn the water heater inlet stop valve’s rod 90 degrees counterclockwise with a hexagonal wrench to open valve.
6)
Close it after 5 seconds, and check for gas leakage.
Using soapy water, check for gas leakage from water heater’s
fl
are and outdoor unit’s
fl
are and valve rods.
After the check is complete, wipe all soapy water off.
Disconnect charging hose from water heater inlet stop valve’s service port, then fully open water heater outlet stop
7)
valve and water heater inlet stop valve.
(Do not attempt to turn valve rod beyond its stop.)
Tighten valve caps and service port caps for the water heater outlet stop valve and water heater inlet stop valve with a
8)
torque wrench at the speci
fi
ed torques.
*1 Vacuum pump run time for water heater connection pipe : Not less
than 10 min.
*2 If the compound pressure gauge pointer swings back, refrigerant
may have water content or a loose pipe joint may exists.
Check all pipe joints and retighten nuts as needed, then repeat
steps 2) through 4).
Re
fi
lling the refrigerant
5.
Check the type of refrigerant to be used on the machine nameplate.
Precautions when adding R410A
Fill from the liquid pipe in liquid form.
It is a mixed refrigerant, so adding it in gas form may cause the refrigerant composition to change, preventing normal operation.
Before
fi
lling, check whether the cylinder has a siphon attached or not. (It should have something like “liquid
fi
lling
1)
siphon attached” displayed on it.)
Filling a cylinder with an attached siphon
Stand the cylinder upright when filling.
There is a siphon pipe inside, so the
cylinder need not be upside-down to
fill with liquid.
Filling other cylinders
Turn the cylinder upside-down
when filling.
Be sure to use the R410A tools to ensure pressure and to prevent foreign objects entering.
2)
Compound
pressure gauge
Pressure meter
High-pressure
valve
Vacuum pump
Valve caps
Service port
Water heater
inlet stop valve
Water heater
outlet stop valve
Gauge manifold
Low-pressure valve
Charging hoses
01_EN_3P266963-1D.indd 8
10/30/2014 9:40:12 AM