Airwell YBZ214, Service Manual

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CONTROL SYSTEM
Service Manual – YBZ DCI 1-A.1 GB 12-7
12.5 8 Degree Heat Mode
Under heat mode, press “Save” button, the system will enter into 8 Degree Heat Mode.
1. 8 Degree Heat Mode can not exist together with Sleep mode. If Sleep Mode is selected, 8
degree Heat Mode will be canceled.
2. The SPT will be 8 degree and display will show the SPT,
3.
Under this mode, IFAN can not be changed manually (Including Turbo speed)
4.
Under this mode, IFAN will operate as following table when compressor is ON. When
compressor stops, IFAN will operate as “
Residual heat blowing function” (refer to 12.4.5)
Indoor Fan speed High Medium Low
RAT <=9 (9,11) >=11
One speed should keep at least 210sec operating before switching to other speeds.
12.6 Auto Cool/Heat Mode
In AUTO mode, the system selects the running mode (COOL/HEAT/FAN) automatically according
to the room temperature. The display shows the actual running mode and setting temperature.
There will be 30s delay for mode conversion.
1. When RAT
≥ 26 degree, the cooling mode is selected.
2. When RAT ≤ 22 degree, the unit runs in heating mode
3. When 22 degree <RAT< 26 degree, upon initial startup, the unit will enter auto mode and run in
automatic fan mode. If the other mode changes into auto mode, the previous running mode will
remain.
(Except from Dry Mode, system will run in automatic fan mode)
12.7 Dry Mode
Dry Mode is same as Cool Mode in EEV, OFAN and compressor control except following:
1) IFAN will be forced to Low speed.
2) For indoor working under Dry mode, Max capacity output is 90% of Cool Mode
In this mode, the Reverse Valve will be OFF and the temperature setting range is 16~30.
12.8 Protections
There are 4 protection codes.
Normal (Norm) – unit operate normally.
Stop Rise (SR) – compressor frequency can not be raised but does not have to be decreased.
HzDown – Compressor frequency is reduced by 1Hz/s (2Hz/s for current protection)
Stop Compressor (SC) – Compressor is stopped.