Pioneer FAB Series Installation Manual page 10

2
Connect the indoor unit BEFORE the outdoor unit.
Important: Ensure the pipe is bent appropriately.
Bend the pipe with thumb
min-radius 100mm
The bending angle should not exceed 90.
Bending position is preferably located somewhere in the
middle of the bendable pipe. The larger the bending
radius, the better.
Do not bend the pipe more than three times.
When connecting the flare nut, coat the nut both inside
and outside with either ester oil or similar, and initially
tighten by hand 3 or 4 turns, before tightening firmly.
Be sure to use both a spanner and torque wrench
together when connecting or disconnecting pipes to/from
the unit.
CAUTION
Too large of a torque will damage the flare cone, and too
little will cause a leakage. Please determine the proper
torque by referring to Table 4.
After the connecting work is finished, be sure to check
that there is no gas leak.
BLUE (Low Pressure) Gauge
BLUE (Low Pressure) Side of Manifold Gauge
Low Pressure Valve
installation manual
8
Air and foreign matter in the refrigerant circuit
can cause abnormal rises in pressure, which
can damage the air conditioner, reduce its
Fig.7-6
efficiency, and even cause injury. Use a vacuum pump
and a manifold gauge to evacuate the line set and the
Indoor Unit, removing any non-condensable gas
and moisture from the system.
Evacuation should be performed upon initial
installation, and whenever the unit is relocated.
Fig.7-7
Fig.7-8
MC
YELLOW (Common) Side of Manifold Gauge
EVACUATION OF LINE SET/INDOOR UNIT
Preparations and Precautions
BEFORE PERFORMING EVACUATION

C heck to make sure that both the LIQUID
SIDE and GAS SIDE pipes between
the indoor and outdoor units are
connected properly, in accordance with the
Refrigerant Piping Connection section of
this manual.

C heck to make sure all wiring is connected
properly.
Before using the manifold gauge and the vacuum
pump, read their operation manuals to familiarize
yourself with how to use them properly.
Table 4
Tightening Torque Lb Ft (Turn clockwise to close)
Service
Valve size Shaft (Valve Body)
Ø 1/4
4～5
Hexagonal
Ø 3/8
wrench 4 mm
Ø 1/2 6～7.5 (5/32")
Hexagonal
Ø 5/8 10～12
wrench 6 mm
Ø 3/4 Hexagonal
20～25
wrench
Ø 1"
10 mm
RED (High Pressure) Gauge
MC
RED (High Pressure) Side of Manifold Gauge
High Pressure Valve
Cap
Service Port
(Valve Core)
Cap
10～12
13～16
8.5～10.2
17～20
26～32