Function Details - Daikin SkyAir RZQ200 · 250C7Y1B Service Manual

SiBE26-701
2.4

Function Details

2.4.1 Malfunction Stop (Retry Control)
When the following items show abnormal values, the thermostat turns OFF and malfunction is
determined based on the number of retry in order to protect the compressor and other devices.
2.4.2 Stand By
2.4.2.1 Restart Standby
To prevent compressor from frequent ON/OFF and equalize pressure in refrigerant line,
conducts forced thermostat OFF for 3 minutes after compressor stopping. Moreover, outdoor
unit fan conducts residual operation for a period of time to expedite equalization and prevent
refrigerant from entering in evaporator.
2.4.2.2 Crank Case Heater Control
When compressor stops for extended period of time, crank case heater control is conducted in
order to prevent refrigerant from dissolving in compressor oil.
Note According to the ambient temperature and the condition, it may control also except the above-
mentioned discharge pipe temperature.
(For standby-power-requirement reduction.)
Function and Operation
Item
Low pressure
High pressure
Discharge pipe
temperature
Power supply
Compressor
Electronic
expansion valve (SVP)
Outdoor unit fan
ON
Criteria
0.07 MPa
3.68 MPa
135°C
Negative phase power supply
Thermostat OFF
3 min.
Residual operation
OFF
70˚C 75˚C
Discharge pipe temperature
Outdoor Unit
Number of retry
2 times
2 times
2 times
0 times (No retry)
ON
OFF
ON
OFF
ON
OFF
61