Refrigerant Circuit; Special Precautions When Dealing With R407C Unit - McQuay C Serie Manual De Instalación

12 VDC or 230V AC
4WV 4WV HTR ALL ALL
1 2 IN OUT
Remove these wires
when do wiring for fan
speed controller
Wiring for fan speed
controller (FSC)
Figure 4
• All mini chillers units are pre-charged with R22 or R407C refrigerant.

SPECIAL PRECAUTIONS WHEN DEALING WITH R407C UNIT

• R407C is a zeotropic refrigerant mixture which has zero ozone depletion potential and thus conformed to the Montreal
Protocol regulation. It requires Polyester oil (POE) oil for its compressor's lubricant. Its refrigerant capacity and perfor-
mance are about the same as the refrigerant R22.
• POE oil is used as lubricant for R407C compressor, which is different from the mineral oil used for R22 compressor.
During installation or servicing, extra precaution must be taken not to expose the R407C system too long to moist air.
Residual POE oil in the piping and components can absorb moisture from the air.
• Refrigerant R407C is more easily affected by dust of moisture compared with R22, make sure to temporarily cover the
ends of the tubing prior to installation.
• No additonal charge of compressor oil is permitted.
• No other refrigerant other than R407C.
• Tools specifically for R407C only (must not be used for R22 or other refrigerant)
i) Manifold gauge and charging hose
ii) Gas leak detector
iii) Refrigerant cylinder/charging cylinder
iv) Vacuum pump c/w adaptor
v) Flare tools
vi) Refrigerant recovery machine
• R407C must be charged as liquid. Usually R407C cylinder is equipped with a dip-pipe for liquid withdrawal.
If there is no dip-pipe, the cylinder should be inverted so as to withdraw liquid R407C from the valve.
• Do not top-up when servicing leak, as this will reduce the unit performance. Vacuum the unit thoroughly and then
charge the unit with fresh R407C according to the amount recommended in the specification.
• Do not touch the compressor or refrigerant piping when the chiller is running. If necessary wear protective gloves.
OFF ON
H C
FM1 FM2 OF1 OF2 C / H ON/
FM1 FM2 OF1 OF2
FSC1
FSC2

REFRIGERANT CIRCUIT

! ! ! ! ! CAUTION
12V 12V 12V
OFF
1-7
Power supply 415V / 3Ph-N / 50Hz
4AC/AC80/100/120/150 C/CR