Toshiba RAS-13YAV-E, RAS-13YKV-E, RAS-10YKV-E Outdoor Unit, Refrigerant Piping Connection

Strong wind

Fig. 9-3-1

– 39 –

9-3. Outdoor Unit

9-3-1. Installation Place

•A place which provides the spaces around the outdoor unit as shown in the left diagram.

•A place which can bear the weight of the outdoor unit and does not allow an increase in noise level and vibration.

•A place where the operation noise and discharged air do not disturb your neighbors.

•A place which is not exposed to a strong wind.

•A place free of a leakage of combustible gases.

•A place which does not block a passage.

•When the outdoor unit is to be installed in an elevated position, be sure to secure its feet.

•An allowable length of the connecting pipe is up 15m.

•An allowable height level is up to 10 m.

•A place where the drain water does not raise any problem.

CAUTION

1.Install the outdoor unit without anything blocking the air discharging.

2.When the outdoor unit is installed in a place exposed always to a strong wind like a coast or on a high story of a building, secure the normal fan operation using a duct or a wind shield.

3.Specially in windy area, install the unit to prevent the admission of wind.

4.Installation in the following places may result trouble. Do not install the unit such places.

•A place full of machine oil.

•A saline-place such as coast.

•A place full of sulfide gas.

•A place where high-frequency waves are

likely to be generated as from audio equipment, welders, and medical equipment.

9-3-2. Refrigerant Piping Connection

Flaring	1. Cut the pipe with a pipe cutter.
	90˚	Obliquity Roughness Warp

Fig. 9-3-2

2.Insert a flare nut into the pipe, and flare the pipe.

•Projection margin in flaring : A (Unit : mm) Rigid (Clutch type)

Outer dia. of	R410A	Conventional
copper pipe	tool used	tool used
6,35	0 to 0,5	1,0 to 1,5
9,52	0 to 0,5	1,0 to 1,5
12,7	0 to 0,5	1,0 to 1,5

Imperial (Wing nut type)

		A	Outer dia. of
				R410A
			copper pipe
Die	Pipe		6,35	1,5 to 2,0
			9,52	1,5 to 2,0
	Fig. 9-3-3		12,7	2,0 to 2,5

Tightening Connection

Align the centers of the connecting pipes and tighten the flare nut as far as possible with your fingers Then tighten the nut with a spanner and torque wrench as shown in the figure.

CAUTION

•Do not apply excess torque. Otherwise, the nut may crack depending on the conditions.

	(Unit : N·m)
Outer dia. of copper pipe	Tightening torque
ø 6,35 mm	14 to 18 (1,4 to 1,8 kgf•m)
ø 9,52 mm	33 to 42 (3,3 to 4,2 kgf•m)
ø 12,7 mm	50 to 62 (5,0 to 6,2 kgf•m)

• Tightening torque of flare pipe connections

Pressure of R410A becomes higher than that of R22. (Approx. 1,6 times) Therefore, using a torque wrench, tighten firmly the flare pipe connecting sections which

connect the indoor and outdoor units		Flare at
up to the specified tightening torque.		indoor
		unit side
Incorrect connections may cause not
only a gas leakage, but also a trouble
of the refrigeration cycle.
Half union	Flare nut
Externally	Internally	Flare at
threaded side	threaded side	outdoor
Use a wrench	Use a torque wrench	unit side
		Fig. 9-3-4
to secure.	to secure.

Fig. 9-3-5

9-3-3. Evacuating

After the piping has been connected to all indoor unit(s), you can perform the air purge together at once.

AIR PURGE

Evacuate the air in the connecting pipes and in the indoor unit using vacuum pump. Do not use the refrigerant in the outdoor unit. For details, see the manual of vacuum pump.

Use a vacuum pump

Be sure to use a vacuum pump with counter-flow prevention function so that inside oil of the pump does not flow backward into pipes of the air conditioner when the pump stops. (If inside oil of the vacuum pump enters into the air conditioner which adopts R410A, a trouble of the refrigeration cycle may be caused.)

1.Connect the charge hose from the manifold valve to the service port of the gas side packed valve.

2.Connect the charge hose to the port of vacuum pump.

3.Open fully the low pressure side handle of the gauge manifold valve.

4.Operate the vacuum pump to start for evacuating. Perform evacuating for about 15 minutes if the piping length is 20 meters. (15 minutes for 20 meters) (assuming a pump capacity of 27 liters per minute.) Then confirm that the compound pressure gauge reading is –101 kPa ( –76 cmHg).

5. Close the low pressure side		Compound		Pressure gauge
		pressure
valve handle of gauge manifold.		gauge
		-101kPa		Manifold valve
6. Open fully the valve stem of		(-76cmHg)
		Handle Lo		Handle Hi
the packed valves (both side				(Keep full closed)
	Charge hose			Charge hose
of Gas and Liquid).
	(For R410A only)			(For R410A only)
7. Remove the charging hose				Vacuum pump
				adapter for
from the service port.		Connecting		counter-flow
				prevention
8. Securely tighten the caps		pipe		(For R410A only)
on the packed valves.				Vacuum
				pump
				Packed valve at liquid side
			Packed valve at gas side
Fig. 9-3-6		Service port
		(Valve core (Setting pin))

CAUTION

•KEEP IMPORTANT 4 POINTS FOR PIPING WORK

1. Take away dust and moisture (Inside of the connecting pipes.)

2. Tight connection (between pipes and unit)

3. Evacuate the air in the connecting pipes using

VACUUM PUMP.

4. Check gas leak (connected points)

Packed Valve Handling Precautions

• Open the valve stem all the way out; but do not try to open it beyond the stopper.

• Securely tighten the valve stem cap with torque in

the following table :		Hexagonal
Gas side	50 to 62 N•m
		wrench is
(ø 12,7 mm)	(5,0 to 6,2 kgf•m)	required.
Gas side	33 to 42 N•m
(ø 9,52 mm)	(3,3 to 4,2 kgf•m)	m
Liquid side	14 to 18 N•m	5m
(ø 6,35 mm)	(1,4 to 1,8 kgf•m)
Service port	14 to 18 N•m
	(1,4 to 1,8 kgf•m)

Fig. 9-3-7

9-3-4. Wiring Connection

1.Remove the electric parts cover from the outdoor unit.

2.Connect the connecting cable to the terminal as identified with their respective matched numbers on the terminal block of indoor and outdoor unit.

3.When connecting the connecting cable to the outdoor unit terminal, make a loop as shown installation diagram of indoor and outdoor unit, to prevent water coming in the outdoor unit.

4.Insulate the unused cords (conductors) with water coming in the outdoor unit. Process them so that they do not touch any electrical or metal parts.

Stripping length of connecting cable

Terminal block (Connecting cable)

		L N	10	1	2 3 10
		10		10
		30		40	40
				30
Connecting	Power Power			Earth line
			Connecting cable
cable	cord	cord
					Fig. 9-3-8
Model		RAS-10YKV-E/RAS-13YKV-E
Power source		50/60 Hz, 220 – 240 V Single phase
Maximum running current				8,5A
Plug socket & fuse rating				10A
Power cord		H07RN-F or 245IEC66 (2,0mm² or more)

CAUTION

•Wrong wiring connection may cause some electrical parts burn out.

•Be sure to comply with local codes on running the wire from outdoor unit to indoor unit (size of wire and wiring method etc.)

•Every wire must be connected firmly.

NOTE : Connecting cable

•Wire type : More than H07RN-F or 245IEC66 (2,0mm² or more)

9-3-5. Gas Leak Test

Flare nut connections

(Indoor unit)

• Flare nut connections (Outdoor unit)

•Valve stem cap connection

•Service port cap connection

Fig. 9-3-9

•Check the flare nut connections, valve stem cap connections and service port cap connections for gas leak with a leak detector or soap water.

9-3-6. Test Operation

To switch the TEST RUN (COOL) mode, press TEMPORARY button for 10 sec. (The beeper will make a short beep.)

TEMPORARY button

TEMPORARY

Fig. 9-3-10

9-3-7. Auto Restart Setting

This product is designed so that, after a power failure, it can restart automatically in the same operating mode as before the power failure,

Information

The product was shipped with Auto Restart function in the off position. Turn it on as required.

How to Set the Auto Restart

•Press and hold down the TEMPORARY button for about 3 seconds. After 3 seconds, the electronic beeper makes three short beeps to tell you the Auto Restart has been selected.

•To cancel the Auto Restart, follow the steps described in the section Auto Restart Function of the Owner’s Manual.