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14
MULTI V IV Outdoor Unit Service Manual
PROTECTION CONTROLS
Pressure Protection Control
Pressure Protection Control
Pressure Control in Cooling Mode
Pressure Range Compressor Fan
Pd ≥ 580 psi
548 psi
519 psi
Stop Stop
Pd > 548 psi -15 Hz / 10 seconds +100 RPM / 10 seconds
Pd ≥ 510 psi Frequency Hold* +100 RPM / 10 seconds
Pd ≥ 505 psi +2 Hz or less / 10 seconds +100 RPM / 10 seconds
Pd < 505 psi Normal Control
Table 12: High Pressure Control in Cooling Mode.
Pressure Range Compressor Fan
Ps ≤ 14 psi, One (1) minute After Operation Stop Stop
Ps ≤ 118 psi, One (1) minute Before Operation -15Hz / 10 seconds -100 RPM / 10 seconds
Table 13: Low Pressure Control in Cooling Mode.
* Frequency Hold = Frequency (or RPM) is not increasing (can decrease).
Pressure Control in Heating Mode
Pressure Range Compressor Fan
Pd ≥ 581 psi Stop Stop
Pd > 495 psi -15 Hz / 10 seconds -50 RPM / 10 seconds
Table 14: High Pressure Control in Heating Mode.
Table 15: Low Pressure Control in Heating Mode.
Pressure Range Compressor Fan
Ps ≤ 14 psi Stop Stop
Ps ≤ 18 psi -15 Hz / 10 seconds +100 RPM / 10 seconds
Ps ≤ 20 psi Frequency Hold* +100 RPM / 10 seconds
Ps ≤ 28 psi +2 Hz or less / 10 seconds +100 RPM / 10 seconds
Ps ≥ 28 psi Normal Control Normal Control
* Frequency Hold = Frequency (or RPM) is not increasing (can decrease).
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