Envision NSZ Installation Manual download pdf (Page 23)

NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL

The Envision series comes with a holding charge. The

charge must be adjusted in the field based on performance.

Refrigeration piping on the split consists of installing a

brazed copper line set between the blower coil unit and the

unit’s split compressor section. To select the proper tube

diameters for the installation, refer to the Line Set Sizes

table. Line sets over 60 feet long are not recommended

because of oil return and pressure drop problems. The

suction line must always be insulated. Handle and route the

line sets carefully to avoid kinking or bending the tubes. If

the line set is kinked or distorted and it cannot be formed

back into its original shape, the bad portion of the pipe

should be replaced. A restricted line set will affect the

performance of the system.

Fasten the copper line set to the blower coil unit as

instructed by the coil installation instructions shown in

Refrigeration

Replace caps after

opening system

Service ports for

attaching refrigerant

gauges

Insulated

Suction Line

Braze

Connection

Liquid

Line

ccw

Figure 13: Typical Split System Refrigerant Line

Connections

Position Description System

Service

Port

CW - Full In Shipping Position Closed Open

CCW - Full Out 1/2 turn CW Service Position Open Open

CCW - Full Out Operation Position Open Closed

TXV ("IN" toward condensing unit)

Equalizer

Bulb

Suction

Liquid

TXV has internal check valve

Figure 14: Attaching the Air Coil

Figure 14. Nitrogen should be bled through the system at 2

to 3 PSI to prevent oxidation inside the refrigerant tubing.

Use a low silver phos-copper braze alloy on all brazed

connections.

Braze line set to the service valve stubs on the outside

front of the split cabinet as shown in Figure 13. Nitrogen

should be bled through the system at 2 to 3 PSI to prevent

oxidation contamination. Use a low silver phos-copper

braze alloy on all brazed connections. Envision split units

are shipped with a factory charge and service valves are not

to be opened until the line set has been leak tested, purged

and evacuated. Schrader cores should be removed before

brazing. A heat sink should be used on the service valves

and TXV to prevent damage caused by excessive heat.

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Envision NSZ Installation Manual Page 23

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