System Evacuation
9
CAUTION
After confirmation of the above conditions, follow these guidelines when performing wiring:
• Always have an individual dedicated power circuit specifically for the air conditioner.
Always follow the circuit diagram posted on the inside of the control cover.
•
• Check that the specifications for the power source meet the requirements of this system.
• Confirm that electrical capacity is sufficient.
• Confirm that cable thickness is sufficient as specified in the power source specifications.
• Always install an earth leakage circuit breaker when in wet or moist areas.
Screws that fasten the wiring inside the casing of the electrical terminals may come lose during
transporation. Because loose screws can cause wire burn-out, check that the screws are tightly
fastened and that all connections are secure.
• The following can cause drops in voltage: vibration at the magnetic switch, which damages
the contact point, results in broken fuses, and results in disturbance of normal functioning.
•
Confirm that starting voltage is maintained at more than 90 percent of the rated voltage
marked on the name plate.
• Before accessing terminals, all supply circuits must be disconnected.
• Disconnect box for the power supply must be incorporated into the fixed wiring. It must have
an air gap contact separation of at least 3mm (1/8”) between each active (phase) conductors.
Page 19
Evacuation
Safety Precautions
Evacuation Instructions
Before using manifold gauge and vacuum pump,
read their operation manuals to familiarize
yourself with how to use them properly.
Air and moisture in the refrigerant system will result
in significant problems with your system, such as:
CAUTION
• Use a vacuum pump with a gauge reading
lower than -0.1MPa (-15 PSI) and air discharge
capacity above 40L/min. (1.5 CFM)
• The outdoor unit does not need vacuuming.
DO NOT
open the outdoor unit’s gas and
liquid stop valves until instructed below.
• Follow all instructions STEP BY STEP carefully.
Read and understand all of theinstructions
given below. Mistakes will always result in
much more complicated solutions and may
cause unnecessary expenses, equipment
damage or shortened life span.
•
DO NOT
use refrigerant gas to evacuate the
system by gas sweeping the pipes.
Rise of pressure in the system.
Rise of operating current.
Drops in cooling or heating efficiency.
Moisture in the refrigerant circuit may freeze
and block flow through the expansion devices.
Water when mixed with refrigerant and oil will
create acid that will damage the motor windings
and components of the compressor.
PROCEDURE FOR DUAL (2) ZONE OUTDOOR UNITS
IS DIFFERENT FROM OTHER MODELS.
FOR DUAL (TWO-ZONE SYSTEMS):
Indoor units and the pipes between indoor and
outdoor units must be evacuated and leak tested to
remove trapped air and moisture from the system.
ONE CIRCUIT AT A TIME. This procedure should start
after all electrical connections are finalized and the
system receives proper power for immediate test
running, to be performed one circuit at a time.
