Air Purging; Air Purge - Toshiba RAV-SP804ATP-E Bedienungsanleitung

6

AIR PURGING

Airtight test
Before starting an airtight test, further tighten the spindle
valves on the gas side and liquid side.
Pressurize the pipe with nitrogen gas charged from the
service port to the design pressure (4.15 Mpa) to
conduct the airtight test.
After the airtight test is completed, evacuate the nitrogen
gas.

Air Purge

With respect to the preservation of the terrestrial
environment, adopt "Vacuum pump" to purge air
(Evacuate air in the connecting pipes) when installing the
unit.
• Do not discharge the refrigerant gas to the
atmosphere to preserve the terrestrial environment.
• Use a vacuum pump to discharge the air (nitrogen,
etc.) that remains in the set. If air remains, the capacity
may decrease.
For the vacuum pump, be sure to use one with a
backflow preventer so that the oil in the pump does not
backflow into the pipe of the air conditioner when the
pump stops.
(If oil in the vacuum pump is put in an air conditioner
including R410A, it may cause trouble with the
refrigeration cycle.)
Compound pressure gauge Pressure gauge
–101 kPa
Gauge manifold valve
(–76 cmHg)
Handle Low
Charge hose
(For R410A only)
Charge hose
(For R410A only)
Vacuum
pump
Charge port
(Valve core
(Setting pin))
Packed valve at gas side
EN-87
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Vacuum pump
As shown in the figure, connect the charge hose after
the manifold valve is closed completely.
Attach the connecting port of the charge hose with a
projection to push the valve core (setting pin) to the
charge port of the set.
Open Handle Low fully.
Turn ON the vacuum pump (*1)
Loosen the flare nut of the packed valve (Gas side) a
little to check that the air passes through. (*2)
Retighten the flare nut.
Execute vacuuming until the compound pressure
gauge indicates –101 kPa (–76 cmHg). (*1)
Close Handle Low completely.
Turn OFF the vacuum pump.
Handle High
Leave the vacuum pump as it is for 1 or 2 minutes, and
(Keep fully closed)
check that the indicator of the compound pressure
gauge does not return.
Vacuum pump
adapter for counter-
flow prevention
Open the valve stem or valve handle fully.
(For R410A only)
(First, at liquid side, then gas side)
Disconnect the charge hose from the charge port.
Tighten the valve and caps of the charge port securely.
manuals search engine
*1
Use the vacuum pump, vacuum pump adapter, and gauge
manifold correctly referring to the manuals supplied with
each tool before using them.
Check that the vacuum pump oil is filled up to the specified
line of the oil gauge.
*2
When air is not charged, check again whether the connecting
port of the discharge hose, which has a projection to push
the valve core, is firmly connected to the charge port.
How to open the valve
Open or close the valve.
Liquid side
Open the valve with a 4 mm hexagon wrench.
Gas side
Using a minus
screwdriver, turn it
counterclockwise
by 90° until it hits
the stopper. (Full
Charge port
open)
Handle position
Groove position
Groove to insert a
screwdriver
Closed completely Opened fully
• While the valve is fully opened, after the screwdriver
has reached the stopper, do not apply torque
exceeding 5 N•m. Applying excessive torque may
damage the valve.
Valve handling precautions
• Open the valve stem until it strikes the stopper.
It is unnecessary to apply further force.
• Securely tighten the cap with a torque wrench.
- 44 -
Cap tightening torque
Ø9.5 mm
Valve size
Ø15.9 mm
Charge port
Replenishing refrigerant
This model is a 30 m chargeless type that does not need
to have its refrigerant replenished for refrigerant pipes up
to 30 m. When a refrigerant pipe longer than 30 m is
used, add the specified amount of refrigerant.
Valve unit
Refrigerant replenishing procedure
1. After vacuuming the refrigerant pipe, close the
valves and then charge the refrigerant while the air
conditioner is not working.
2. When the refrigerant cannot be charged to the
specified amount, charge the required amount of
refrigerant from the charge port of the valve on the
gas side during cooling.
Flare nut
Requirement for replenishing refrigerant
Replenish liquid refrigerant.
When gaseous refrigerant is replenished, the refrigerant
composition varies, which disables normal operation.
Adding additional refrigerant
31~50 m: L
40 g × (L-30)
• L: Pipe length
• To add an additional amount of refrigerant for twin-
indoor unit types, refer to the installation manual
supplied with the branching pipe (sold separately).
• The refrigerant need not be reduced for a 30 meter (or
less) refrigerant pipe.
14 to 18 N•m
(1.4 to 1.8 kgf•m)
20 to 25 N•m
(2.0 to 2.5 kgf•m)
14 to 18 N•m
(1.4 to 1.8 kgf•m)
EN-88