Vacuum - Toshiba RAV-SP302AT2P-UL Installation Manual

 System requirements
• Minimum refrigerant line length between the outdoor
unit and indoor unit is 16'5" (5 m)
• Maximum pipe lengths
Allowable Height difference
pipe length (Indoor-outdoor H)
(ft (m)) (ft (m))
Total length Indoor unit: Outdoor unit:
L Upper Lower
246'1" (75) 98'5" (30) 98'5" (30)
Figure of Single
Indoor Unit
Outdoor Unit
Refrigerant sizes
Liquid side Gas side
Outer Outer
Thickness
diameter diameter
Ø3/8" 0.03" Ø5/8"
(9.5 mm) (0.8 mm) (15.9 mm)
Flare nuts and flaring
• The flare nuts and flaring are different from those for
the conventional refrigerant.
Use the flare nuts supplied with the air conditioner
or those for R410A.
• Before performing flaring, carefully read
"REFRIGERANT PIPING"
Insulation (Local supplied)
Both lines need to be insulated. Use a minimum
0.4" (10 mm) wall thickness.
21-EN
Refrigerant charge
Length of refrigerant
pipe connected to Additional refrigerant
indoor/outdoor unit
16'5" - 98'5"
None
Number of
(5 - 30 m)
bent
Add 0.43 oz/ft (40 g/m) of
portions
*98'5" - 246'1"
refrigerant for piping that exceeds
(30 - 75 m)
98'5" (30 m) up to 246'1" (75 m).
10 or less
* Caution during addition of refrigerant
Max. amount of additional refrigerant is 1.8 lbs (800 g).
Charge the refrigerant accurately. Overcharging may
cause serious trouble with the compressor.
* Minimum refrigerant pipe is 16'5"(5 m).
This may cause a malfunction of the compressor or
other devices.
Metering Device is an electronic EXV (PMV) in
outdoor unit.
 Connecting power and control
cables (Field supplied)
• The main power is supplied to the outdoor unit. The
field supplied connecting cables from the outdoor
unit to the indoor unit consist for 4 wires and provides
the power for the indoor unit as well as the
communication signal between the outdoor and
indoor unit.
Thickness • System interconnection wire size must be AWG16.
• Breaker must have a capacity specified in the
0.04"
following table.
(1.0 mm)
• All wiring must comply with local electric codes and
NEC (National Electric Code) or CEC (Canadian
Electric Code).
Model RAV-
Power supply
MCA
MOCP (MAX Fuse/CB)
Breaker
System interconnection wires
Field power supply wires
MCA = Minimum Circuit Amps
MOCP =Maximum Over Protection Device Amps.
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6

Vacuum

CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Never use the system compressor as a vacuum pump.
Refrigerant tubes and indoor heat exchanger should
be evacuated using the recommended deep vacuum
method of 500 microns. The alternate triple evacuation
method may be used if the procedure outlined below is
followed. Always break a vacuum with dry nitrogen.
 System vacuum and charge
Using Vacuum Pump
1. Completely tighten flare nuts A, B, C, D, connect
manifold gage charge hose to a charge port of the
low side service valve.
Service Valve
Outdoor Unit
Service Valve
2. Connect charge hose to vacuum pump.
3. Fully open the low side of manifold gage.
Manifold
SP302, 362, 422, 482
500 microns
208/230V, 60 Hz
Low side valve
30A
40A
Charge hose
32A
AWG16
AWG10
4. Start vacuum pump.
5. Evacuate using either deep vacuum or triple
evacuation method.
6. After evacuation is complete, fully close the low side
of manifold gage and stop operation of vacuum
pump.
Deep Vacuum Method
The deep vacuum method requires a vacuum pump
capable of pulling a vacuum of 500 microns and a
vacuum gage capable of accurately measuring this
vacuum depth. The deep vacuum method is the most
positive way of assuring a system is free of air and
liquid water.
Deep Vacuum Graph
Refrigerant
Indoor Unit
Low Side
High Side
Triple Evacuation Method
The triple evacuation method should only be used
when vacuum pump is only capable of pumping down
to 28 in. of mercury vacuum and system does not
Manifold Gage
contain any liquid water.
Refer to "Triple Evacuation Method chart" and proceed
as follows:
1. Pump system down to 28 in. of mercury and allow
pump to continue operating for an additional 15
High side valve minutes.
2. Close service valves and shut off vacuum pump.
Charge hose
3. Connect a nitrogen cylinder and regulator to system
and open until system pressure is 2 psig.
4. Close service valve and allow system to stand for
Vacuum pump
1 hr. During this time, dry nitrogen will be able to
diffuse throughout the system absorbing moisture.
5. Repeat this procedure as indicated in the chart.
System will then be free of any cotaminants and
Low side valve
water vapor.
5000
4500
4000
LEAK IN
3500
SYSTEM
3000
2500
2000
VACUUM TIGHT
1500
TOO WET
1000
TIGHT DRY
500
SYSTEM
0 1 2 3 4 5 6 7
MINUTES
22-EN