Frequently Asked Questions

For C-SB, the mounting foot and pipe configuration is the same.

For C-CS, the mounting foot is the same, but there will be some tubing changes or modifications required.

Continued operation in reverse rotation has the potential of causing internal compressor damage or compressor failure.

Corrective: Reversal of any two of the power supply wires to the line/load side of the compressor control contactor will correct the reverse operation.

User the reversal defensible relay o protect the compressor from reverse rotation operation.

It is not possible. The reason why Sonyo don’t advise to use kit starter is, with motor design, the voltage on the kit starter will be very high, so it may burn the kit starter.

The discharge thermostat is required if HP and LP pressure switch settings don’t protect compressor against operation beyond its specific envelope.

The function of discharge check valve is to eliminate the noise of reverse rotation when compressor shut down. The valve plate is pushed up by the discharge pressure at normal running conditions and will keep at the top position of valve seat. When compressor shut down, the valve will return to its original position, on top of the discharge port.

Sometimes, if the A/C system is not clear, the impurity in the system could impact this valve plate during compressor running, and break the valve plate into several small pieces, which could be taken out of the compressor by the discharging gas. If so, the compressor will run without discharge check valve, in such condition, the compressor will always have a reverse rotation noise when shut down, but this will not affect the reliability of the compressor.

During high compression ratio conditions (≥10), the suction pressure drop causes compressor to discharge gas discontinuously, the internal discharge check valve will open and shut repeatedly and make clatter.

There is no problem to use compressors with pump down system. A separate external check valve must be added to the discharge line if pump-down is used.

R290 is a highly flammable substance, there is a risk of fire if it leaks into the atmosphere.

That is way Sonyo can’t give the approval to R290 for scroll compressor.

The compressors can work with R407F, R407A, R404A, R448A, R449A, R134a, R513A, there isn’t any lubrication problem. But it is very important to use a discharge sensor, the discharge temperature is higher when the compressor works with R407F, R448A or R449A. The application limits must be respected for each refrigerant, consult technical data sheets.

The lifetime of compressors depends on the total annual running hours and the running conditions system.

If properly applied to approved application conditions which are stated in the compressors Approval Sheet, Sonyo compressors will have a service life of 20000 hours with very low failure rate.

For example (AC):

• Cooling season: 3 months
• Heating season: 3,5 months
• 244 hours per month (30,5days *12 hours*2/3)
• 1.586 hours per year (6,5 months *244 Hours)
• Life time: 12,6 years (20.000/1586)

The range of frequency is 45Hz to 65Hz for B8 models (380-415V/50Hz, 440-460V/60Hz)

Yes it is possible to make a tandem system with different compressors if use B+B model or C+C models. But could not use B+C models.

It is possible to add small volume of POE (with the same viscosity) into oil PVE, the percentage of POE should be lower than 5%.

Can only be used with the refrigerant indicated on the compressor label.

No, the GMCC compressors are monophase.

Less vibration. The vibration of the rotary compressor in operation can be broken down into two sources: vibration in the normal direction of the cylindrical case resulting from the mass imbalance in the shaft rotor rotation system, and vibration in the rotational direction resulting from the pulsation of compressed refrigerant gas.

The mass imbalance in the shaft rotor rotation system is offset by installing balancing weight in the upper and the lower part of the rotor to keep the unbalanced force of rotation and the unbalanced force of moment in balance.

Rotary compressors are high pressure shell type compressors. The suction on these compressors is taken directly into the compression chamber. Gas compressed in the compression chamber is discharged into the compressor casing. As the shell is on the high pressure side, discharge gas containing oil droplets is discharged inside the shell one. Therefore, the shell function s as on oil separator, enabling favorable lubrication with a small amount of discharge oil from the compressor to the condenser.

The function of the accumulator is protecting the compressor of excessive refrigerant, oil or impurity in the suction chamber of the compressor.

200000 cycles or less, 5 minutes or more every cycle  (ON：2MINUTES OR MORE，OFF：2MINUTES MORE.

The compressor should be run at a gradient of up to 5º.