Mitsubishi Electric PEFY Series Technical & Service Manual page 4

Warning:
Note the following when building a heater in the air
conditioning system.
- Leave enough space between units for proper ventilation so that
the indoor unit temperature does not exceed 40°C when windless.
- Keep the heater clean, and take appropriate measures so that
the indoor unit does not suck in the dust particles that accumulate
on the heater.
interlocked operation with indoor units.
- Do not build a heater inside the indoor unit.
Recommended circuit
Wiring diagram
R
1-phase power
S
supply
208V, 230V/60Hz R
S
Control board
FS1, 2 ----- Thermal fuse
H1, H2 ----- Heater
26H --------- Overheat protection
thermostat
88H --------- Electromagnetic contactor
HWE12120
88H
H1
FS1
FS2
88H
H2
FS1
FS2
26H
88H
CN24
2. Precautions for devices that use
R410A refrigerant
Caution:
Do not use the existing refrigerant piping.
- The old refrigerant and refrigerator oil in the existing piping
contains a large amount of chlorine which may cause the
refrigerator oil of the new unit to deteriorate.
Use refrigerant piping made of C1220 (Cu-DHP) phosphorus
deoxidized copper as specified in the *JIS H3300 "Copper and
copper alloy seamless pipes and tubes". In addition, be sure
that the inner and outer surfaces of the pipes are clean and
free of hazardous sulphur, oxides, dust/dirt, shaving particles,
oils, moisture, or any other contaminant.
- Contaminants on the inside of the refrigerant piping may cause
the refrigerant residual oil to deteriorate.
* JIS: Japanese Industrial Standard
Store the piping to be used during installation indoors and
keep both ends of the piping sealed until just before brazing.
(Store elbows and other joints in a plastic bag.)
- If dust, dirt, or water enters the refrigerant cycle, deterioration of
the oil and compressor trouble may result.
Use ester oil, ether oil or alkylbenzene (small amount) as the
refrigerator oil to coat flares and flange connections.
- The refrigerator oil will degrade if it is mixed with a large amount
of mineral oil.
Use liquid refrigerant to fill the system.
- If gas refrigerant is used to seal the system, the composition of
the refrigerant in the cylinder will change and performance may
drop.
Do not use a refrigerant other than R410A.
- If another refrigerant (R22, etc.) is used, the chlorine in the
refrigerant may cause the refrigerator oil to deteriorate.
Use a vacuum pump with a reverse flow check valve.
- The vacuum pump oil may flow back into the refrigerant cycle and
cause the refrigerator oil to deteriorate.
Do not use the following tools that are used with conventional
refrigerants.
(Gauge manifold, charge hose, gas leak detector, reverse
flow check valve, refrigerant charge base, vacuum gauge,
refrigerant recovery equipment)
- If the conventional refrigerant and refrigerator oil are mixed in the
R410A, the refrigerant may deteriorated.
- If water is mixed in the R410A, the refrigerator oil may deteriorate.
- Since R410A does not contain any chlorine, gas leak detectors
for conventional refrigerants will not react to it.
Do not use a charging cylinder.
- Using a charging cylinder may cause the refrigerant to deteriorate.
Be especially careful when managing the tools.
- If dust, dirt, or water gets in the refrigerant cycle, the refrigerant
may deteriorate.
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