Technical Changes; Safety Precaution - Mitsubishi Electric PUMY-P100VHMA Technical & Service Manual

1

TECHNICAL CHANGES

PUMY-P100VHM
PUMY-P125VHM
PUMY-P140VHM
Compressor(MC) and oil have been changed.
ANB33FDCMT ANB33FDHMT
Ester oil Ether oil
Electrical parts below have been changed.
1Controller board (MULTI.B.)
3Active filter module(ACTM)
PEFY-P15 can be connected.
2

SAFETY PRECAUTION

2-1. CAUTIONS RELATED TO NEW REFRIGERANT
Cautions for units utilizing refrigerant R410A
Use new refrigerant pipes.
Avoid using thin pipes.
Make sure that the inside and outside of refrige-
rant piping are clean and it has no contamination
such as sulfur hazardous for use, oxides, dirt,
shredded particles, etc.
In addition, use pipes with specified thickness.
Contamination inside refrigerant piping can cause deterio-
ration of refrigerant oil etc.
Store the piping to be used during installation
indoors and keep both ends of the piping sealed
until just before brazing. (Leave elbow joints, etc.
in their packaging.)
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
Use ester oil, ether oil or alkylbenzene oil (small
amount) as the refrigerant oil applied to flares
and flange connections.
If large amount of mineral oil enters, that can cause deterio-
ration of refrigerant oil etc.
Charge refrigerant from liquid phase of gas
cylinder.
If the refrigerant is charged from gas phase, composition
change may occur in refrigerant and the efficiency will be
lowered.
PUMY-P100VHMA
PUMY-P125VHMA
PUMY-P140VHMA
2Noise filter circuit board (N.F.)
4Relay(52C), Resister(RS)(Including N.F.)
Do not use refrigerant other than R410A.
If other refrigerant (R22 etc.) is used, chlorine in refrige-
rant can cause deterioration of refrigerant oil etc.
Use a vacuum pump with a reverse flow check
valve.
Vacuum pump oil may flow back into refrigerant cycle and
that can cause deterioration of refrigerant oil etc.
Use the following tools specifically designed for
use with R410A refrigerant.
The following tools are necessary to use R410A refrigerant.
Tools for R410A
Gauge manifold
Charge hose
Gas leak detector
Torque wrench
Keep the tools with care.
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
Do not use a charging cylinder.
If a charging cylinder is used, the composition of refrigera-
nt will change and the efficiency will be lowered.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
2
Flare tool
Size adjustment gauge
Vacuum pump adaptor
Electronic refrigerant
charging scale