CAUTION

∙KEEP IMPORTANT 5 POINTS FOR PIPING WORK.

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

(2)Tighten the connections (between pipes and unit).

(3)Evacuate the air in the connecting pipes using a VACUUM PUMP.

(4)Check gas leak (connected points).

(5)Be sure to fully open the packed valves before operation.

∙UNIT DAMAGE HAZARD

Failure to follow this caution may result in equip. - ment damage or improper operation.

Never use the system compressor as a vacuum pump.

10-5-2. Packed valve handling precautions

∙Open the valve stem until it touches the stopper. Once it is in contact with the stopper, refrain form applying any more force than is necessary.

∙Securely tighten the valve stem cap with torque in the following table:

Gas side

37 to 46 lbf.ft

Ø1/2 in. (Ø12.70 mm)

(50 to 62 N·m)

Gas side

24 to 31 lbf.ft

Ø3/8 in. (Ø9.52 mm)

(33 to 42 N·m)

Liquid side

10 to 13 lbf.ft

Ø1/4 in. (Ø6.35 mm)

(14 to 18 N·m)

Service port

10 to 13 lbf.ft

(14 to 18 N·m)

 

Hexagon wrench

is required.

 

 

.

 

in

 

3/16 m

 

m

 

(4

FILE NO. SVM-10020

10-6. SYSTEM REQUIREMENTS

10-6-1. Piping (Field supplied)

•Minimum refrigerant line length between the outdoor unit and indoor unit is

6.6ft. (2m).

•Maximum pipe lengths

Allowable Pipe length T

Height difference

(Indoor − Outdoor H)

(ft (m))

 

(ft (m))

66 (20)

33 (10)

 

 

 

 

 

 

 

 

T H

Refrigerant pipe sizes

Liquid side

 

Gas side

 

 

 

 

 

 

Outer

Thickness

Outer diameter

Thickness

Diameter

 

In. (mm)

 

In. (mm)

In. (mm)

 

 

In. (mm)

(09, 12LKV)

(15, 17, 22LKV)

 

 

 

 

 

 

 

 

Ø1/4 (6.35)

0.03 (0.8)

Ø3/8 (9.52)

Ø1/2 (12.70)

0.03 (0.8)

 

 

 

 

 

Insulation

Both lines need to be insulated. Use a minimum 5/16 in (8mm) wall thickness.

Fig. 10-5-2

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