Trane Variable Refrigerant Flow System Mini Outdoor Unit Series Instalační manuál stáhnout pdf (Strana 19)

VRF-SVN33A-EN 19

Refrigerant Piping

Nitrogen Flushing While Brazing

While brazing refrigerant pipes, flush them with nitrogen gas. Use a pressure regulator to maintain

a flow rate of 1.76 ft

/h (0.05 m

/h) or more.

Figure 13. Nitrogen flushing while brazing refrigerant pipes

Flared Pipe Connections

Clutch type and wing nut type flare tools are available for flared pipe connections.

1. Slide the flare nut over the pipe to be flared.

2. Slide the end of the pipe into the hole on the flaring bar that fits the pipe, leaving a length of

pipe, determined by tool type (see table), extending above the flaring bar. Clamp it down.

NOTICE

Avoid Unit Damage!

Never braze pipe connections without performing nitrogen flushing. Failure to perform this

procedure will damage the unit, resulting in capacity loss and reduced long-term reliability.

Flow meter

Pressure regulator

Stop valve

Nitrogen

R-410A clutch type

Conventional flare tool

Clutch type Wing nut type

0–0.020 in. 0.04–0.06 in. 0.06–0.08 in.

Length of pipe extending above flare bar

Pipe

Flaring

bar

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 51 52

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Trane Variable Refrigerant Flow System Mini Outdoor Unit Series Instalační manuál Strana 19