Daikin EWWQ-AJYNN Service Manual page 126

Appendix B
1
3
5 6
6–22
■
In addition, ensure that there is sufficient temperature difference between evaporator and
condenser entering temperatures to provide a ratio of more than 2 to 1 between the saturated
evaporator and condenser pressure, in absolute, at the start-up. If not, either change the
temperatures if possible or, at least, monitor the pressure difference at start-up as the unit may trip
if the pressure ratio is too low.
■ Replace main fuses and, if oil heaters have been on long enough to establish superheat in the oil
separator (Min 4 hours), start circuit 1, leaving the other circuit(s) manually switched off.
■ Observe operating conditions, in particular, suction and discharge superheats, liquid subcooling
and evaporator and condenser approach temperatures. Adjust refrigerant charge and/or control
settings, as necessary.
■ Check correct operation of compressor capacity control, expansion valve operation, condenser
water temperature control plus any other optional devices.
■ Check the operation of all safety devices, either by adjusting the operating conditions to cause an
alarm, or by changing the alarm setpoint.
■ Repeat for all other circuits, one at a time. And then with all circuits together.
■ When the unit is operating correctly with all circuits, and as close to design conditions as possible,
take a full log and record the final software settings.
■ If the unit incorporates heat-recovery or heat pump operation, repeat the unit operation checks in
heating mode and, again, take a full log. Complete the standard log sheets and return to Daikin
Europe Service Department. If heating operation is not possible at the time of commissioning,
arrange with the client to return when it is possible.
■
Make a note of any anomalies in the operating conditions or application.
■ Check that the unit is acceptable to the client and establish with him that the warranty starts from
this date, preferably in writing.
IF IN DOUBT CALL DAIKIN EUROPE SERVICE DEPARTMENT
ESIE07-05
Part 5 – Maintenance