Sinclair SDV 6 Service Manual page 61

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Note 1:
Step 1: Check whether pipes are leaking refrigerant.
Method:
If the system is connected with the refrigerant cutoff device, use the refrigerant pressure gauge to
connect the check valve of refrigerant cut-off device liquid or gas pipe; If the system is not
connected with a refrigerant cut-off device, use the refrigerant pressure gauge to connect the
check valve of refrigerant cut-off device liquid or gas pipe. Measuring the refrigerant saturation
pressure in the pipeline on site.
(1)If the measured refrigerant saturation pressure on the liquid side or gas side is lower than the
standard saturation pressure (see Table of Ambient Temperature and Standard Saturation
Pressure of R32 attached to this manual), there is a refrigerant leak. Follow the steps below to
repair refrigerant leaks:
 Use a refrigerant recovery machine to recover refrigerant left in the unit (When the refrigerant
leaks, the refrigerant shut-off device is closed. Therefore, the refrigerant needs to be
recovered from the service port of the refrigerant cut-off device of the outdoor stop valve .
When recovering the refrigerant, the outdoor unit needs to enter the vacuum mode to ensure
the effect of refrigerant recovery.)
 Locate and repair pipeline leaks.
 After the repair is completed, the system is tested for gas tightness, refer to the Owner's and
installation manual for details. If the gas tightness test is passed, go to the next step,
otherwise repeat the step above until the gas tightness test is passed
 Replace the R32 sensor model of the faulty IDU.
 Recharge refrigerant according to the ODU Installation Manual.
(2) If the measured refrigerant saturation pressure on the liquid side or gas side is equal to the
standard saturation pressure (see Table of Ambient Temperature and Standard Saturation
Pressure of R32 attached to this manual), confirm whether there is a refrigerant leak by using
refrigerant testing instruments. If it is determined that there is a refrigerant leak, please operate the
refrigerant leak handling procedure above.
Step 2: Reset the R32 refrigerant detection device.
As shown in Figure 1 below, after an alarm is triggered for refrigerant leaks, the red LED indicator
of the R32 refrigerant detection device (LED3) flashes twice every second. After leaks are
repaired, press and hold the S1 button on the control board for 20s to reset the refrigerant
detection device. After the device has been reset, all the LED indicators are lit for 2s before the y
become dimmed. Time the R32 sensor has been used will be cleared.