- The system cumulative heating duration is greater than or equal to 180 min when
ambient temperature is below 14°F (-10°C).
14. In defrost mode, the module runs a reversed refrigeration cycle and air-to-water heat pump
heating capacity diminishes as a result.
15. When ice builds up on the ambient coils, operate the unit in defrosting mode to remove
defrost. The number of defrosting circuits must not exceed half of the total number of
circuits. When in defrost mode, the circuit operating in heat pump mode is in balance with
the circuit operating in defrost. Heat energy is not removed from the hot water system
because the controller minimizes the quantity of circuits that can defrost at any one time.
Less than half of total circuits can enter defrost at any time, which reduces heating capacity
loss and helps minimize the temperature impact on the system.
Human machine interface (HMI)
The HMI enables the user to control the unit operation either manually or automatically, or through
remote communications. In addition, it provides access to view, change, and program parameters
and system commands and view faults using a 7 in. touchscreen.
Use the 7 in. resistive touchscreen to configure unit parameters and view operating data. It is
protected by an IP55 insulation panel. The controller is connected with the mainboard by RS-485
communication port. Different access levels are available through the button in the upper-right
corner.
All the data is displayed in metric values, in English or a number of European languages. The
following sections give an overview of the operation of the unit and the use of the HMI.
Note: The default access is Viewer. To access Operator, enter the password 9017. After 5 min
of inactivity, the screen dims and the access level returns to Viewer. You can set the default
standby time duration within a range from 2 min to 60 min in HMI menu.
YMAE Air-Cooled Inverter Scroll Chiller and Heat Pump102
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