Maintenance; First Time Installation Check; Drain Pump Control; Follow Me - York YEFE BZTM-MOW1 Series Service Manual

With this new technology, the display area will show "EC"
when the outdoor unit detects refrigerant leakage.
1.13 Follow me(Optional)
• If you press "Follow Me" on the remote, the indoor
unit will beep. This indicates the follow me function is
active.
• Once active, the remote control will send a signal
every 3 minutes, with no beeps. The unit automatically
sets the temperature according to the measurements
from the remote control.
• The unit will only change modes if the information
from the remote control makes it necessary, not from
the unit's temperature setting.
• If the unit does not receive a signal for 7 minutes, the
function turns off. The unit regulates temperature
based on its own sensor and settings.
• Wired remote controller is prior to wireless remote
controller.
• Use the water-level switch to control drain pump.
• The system checks the water level every 5 seconds.
• When the A/C operates in cooling (including auto
cooling) or forced cooling mode, the pump begins
running immediately and continuously until cooling
stops.
• If the water level increases up to the control point,
the LED displays an alarm code and the drain pump
opens and continually monitors the water level. If
the water level falls and LED alarm code is no longer
displayed (drain pump close delay is 1 minute), the
unit goes back into its last mode. Otherwise, the
entire system (including the pump) stops and the
LED displays an alarm again after 3 minutes.
1.14 Drain Pump Control (For Duct and
Cassette)
• Use the water-level switch to control drain pump.
• The system checks the water level every 5 seconds.
• When the A/C operates in cooling (including auto
cooling) or forced cooling mode, the pump begins
running immediately and continuously until cooling
stops.
• If the water level increases up to the control point,
the LED displays an alarm code and the drain pump
opens and continually monitors the water level. If
the water level falls and LED alarm code is no longer
displayed (drain pump close delay is 1 minute), the
unit goes back into its last mode. Otherwise, the
entire system (including the pump) stops and the
LED displays an alarm again after 3 minutes.

1. Maintenance

1.1

First Time Installation Check

Air and moisture trapped in the refrigerant system affects
the performance of the air conditioner by:
• Increasing pressure in the system.
• Increasing the operating current.
• Decreasing the cooling or heating efficiency.
• Congesting the capillary tubing due to ice build-up in
the refrigerant circuit.
• Corroding the refrigerant system.
To prevent air and moisture from affecting the air
conditioner's performance, the indoor unit, as well as the
pipes between the indoor and outdoor unit, must be be
leak tested and evacuated.
Leak test (soap water method)
Use a soft brush to apply soapy water or a neutral liquid
detergent onto the indoor unit connections and outdoor
unit connections. If there is gas leakage, bubbles will form
on the connection.
Air purging with vacuum pump
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