Operation Manual

Installation instructions
21
Outdoor unit section
1. Remove the high and low pressure valve caps
with a wrench.
2. Remove the plastic cover for connecting pipes.
3. Align the pipe and connector with one hand,
pre-tighten the flare nut to the connector
with another hand. Then tighten it with a wrench.
(As the left figure shown)
connecting pipe
Large pipe(gas)
Small pipe (liquid)
Flare nut
Connector
Low pressure valve
High pressure valve
If the suspending section of the connecting pipes exceed 2m, a fixing bracket should be
installed for every 1.5m to support its weight.
.
Air purge
After connecting the indoor and outdoor units , evacuate air and moisture from refrigerant system using a
vacuum pump, as shown here below.
(1). Unscrew and remove caps from 2 and 3-way valves.
(4). Start vacuum pump for 10-15 minutes until reaching a vacuum of 10 mm Hg absolutes.
(6). Open 2-way valve 1/4 turn then close it after 10 seconds. Check tightness of all joints using liquid
soap or an electronic leak detector.
(7). Turn 2 and 3-way valves stem to fully the valves. Disconnect vacuum pump flexible hose.
(5). With vacuum pump still running close the low pressure knob on vacuum pump manifold. Then stop
vacuum pump.
(2). Unscrew and remove cap from service valve.
(3). Connect vacuum pump flexible hose to the service valve.
How purging air tubes:
Flow direction
R22 refrigerant
2-way valve
(6) Open 1/4 turn
valve cap
(1) Turn
(8) Tighten
(2) Turn
3-way valve
(8) Tighten
(1) Turn
(7) Turn to fully open the
valve
(7) Turn to fully open the valve
(8) Tighten
3-way valve diagram
connect to indoor unit
open position
spindle
service port cap
service
valve
connect to outdoor unit
valve core
needle
vacuum pump
indoor unit
valve cap