Toshiba RAV-GM2241AT8-E1 Installation Manual page 18

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.
↓
Leave the vacuum pump as it is for 1 or 2 minutes, and
check that the indicator of the compound pressure gauge
does not return.
↓
Open the valve stem or valve handle fully. (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.
*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.
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 How to open the valve
Fully open the valves of the outdoor unit. (First fully
open the valve on the liquid side, and then fully open
the valve on the gas side.)
* Do not open or close the valves when the ambient
temperature is -20°C or less. Doing so may damage
the valve O-rings and result in refrigerant leakage.
Liquid side
Open the valve with a 4 mm hexagon wrench.
Gas side
Valve unit
Using a minus screwdriver,
turn it counterclockwise by
90° until it hits the stopper.
(Full open)
Charge port
(1)
Flare nut
(2)
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.
Cap tightening torque
33 to 42 N•m
Dia. 12.7 mm
(3.3 to 4.2 kgf•m)
Valve size
20 to 25 N•m
Dia. 19.1 mm
(2.0 to 2.5 kgf•m)
14 to 18 N•m
Charge port
(1.4 to 1.8 kgf•m)
– 17 –
 Insulating the Pipes
• The temperatures at both the liquid side and gas side
will be low during cooling so in order to prevent
condensation, be sure to insulate the pipes at both of
these sides.
• Insulate the pipes separately for the liquid side and
gas side.
• Insulate the branch pipes by following the
instructions in the installation manual provided with
the branch pipe kit.
• Use the insulating material provided as an accessory
to insulate the Dia. 19.1 mm pipe at the gas side.
• Seal the area where the Dia. 19.1 mm pipe and Dia.
22.2 to Dia. 28.6 mm pipe are connected so that no
gaps are left.
REQUIREMENT
Be sure to use an insulating material which can
withstand temperatures above 120°C for the gas side
pipe since this pipe will become very hot during heating
operations.
 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.
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.
Requirement for replenishing refrigerant
Replenish liquid refrigerant.
When gaseous refrigerant is replenished, the
refrigerant composition varies, which disables normal
operation.
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