Outdoor Unit Installation; Air Purging - NEC RIH-2667 User Manual

Installation instructions

Outdoor unit installation

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
port as the right figure shown.
2. Install and Fix Outdoor Unit
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)

Air purging

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.
Refrigerant flow direction
3-way valve
Service
port
(2) Turn
(8) Tighten
Note: To protect the environment, be sure not to discharge the refrigerant to the air directly.
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indoor unit
2-way valve
(7) Turn to fully open the
valve
(1) Turn
Valve cap
(8) Tighten
Vacuum pump
(6) Open 1/4 turn
(7) Turn to fully open the valve
valve cap
(1) Turn
(8) Tighten
Connect to outdoor unit
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Washer
Drain port
Drain hose
(pre pare by user)
3-way valve diagram
connect to indoor unit
open position
spindle
needle
service port cap
Valve core