NS SPLIT INSTALLATION MANUAL
Refrigeration
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 table on page 9. Line sets over 60 feet long are not recommended because of oil return and pressure drop problems. The suction line must always be insu- lated. 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.
Connection to Air Coil
Figures 1 and 2 illustrate typical Envision Split installations. The table on page 9 shows typical lineset diameters and maximum length. As in all
Fasten the copper line set to the blower coil unit as instructed by the coil installation instructions shown in 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
Braze line set to the service valve stubs on the inside front of the split cabinet as shown in Figure
Figure 13: Typical Split System Refrigerant Line Connections
13. Nitrogen should be bled through the system at |
2 to 3 PSI to prevent oxidation contamination. Use |
a low silver |
Service ports for attaching refrigerant gauges
Insulated
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. |
Suction Line
Replace caps after | ccw |
| |
opening system |
|
ccw
Braze
Connection
Liquid
Line
20
