NEC RIH-2667 Installation instructions, Outdoorunitinstallation, Airpurging, Vacuum pump

Installation instructions

Outdoorunitinstallation

1.Install Drain Port and Drain Hose (for heat-pump model only)

The condensate drains from the outdoor unit when the unit operates
in heating mode. In order not to disturb your neighbor and protect
the environment, install a drain port and a drain hose to direct the
condensate water. Just install the drain port and rubber washer to
the chassis of the outdoor unit, then connect a drain hose to the		Washer
port as the right figure shown.	Drain port	Drain hose
2. Install and Fix Outdoor Unit		(prepare by user)
Fix with bolts and nuts tightly on a flat and strong floor.
If installed on the wall or roof, make sure to fix the supporter well to prevent it
from shaking due to serious vibration or strong wind.
3. Outdoor Unit Piping Connection

Remove the valve caps from the 2-way and 3-way valve.

Connect the pipes to the 2-way and 3-way valves separately according to the required torque.

4. Outdoor Unit Cable Connection (see previous page)

Airpurging

The air which contains moisture remaining in the refrigeration cycle may cause a malfunction on the compressor. After connecting the indoor and outdoor units, evacuate air and moisture from refrigerant cycle using a vacuum pump, as shown below.

Vacuum pump

indoor unit

Service port

(2)Turn

(8)Tighten

Refrigerant flow direction	2-way valve	3-way valve diagram
3-way valve

connect to indoor unit

(6) Open 1/4 turn

(7) Turn to fully open the valve

(1) Turn

Valve cap (8) Tighten

(7)Turn to fully open the valve valve cap

(1) Turn

(8) Tighten

Connect to outdoor unit

Valve core

open position spindle

needle

service port cap

Note: To protect the environment, be sure not to discharge the refrigerant to the air directly.

21

PDF created with pdfFactory Pro trial version www.pdffactory.com