Digital Operation; Reset To Factory Settings - Emerson "Hot Key; How To Save Factory Settings Or User Settings; Figure 20: Digital Operation - Emerson Copeland EazyCool OM 501 Series Application Manuallines

2.12.1 Digital operation

A Digital unit is able to operate in a part-load mode. Part-load operation is achieved by loading
and unloading of the Digital scroll compressor for certain periods of time (time cycles). The cycle
of time can be chosen between 10 and 30 seconds. Example: if the time cycle is 20 seconds at
50% of capacity request, the compressor will run for 10 seconds loaded and 10 seconds unloaded.
For proper commissioning of the Digital unit the following diagram must be considered:

Figure 20: Digital operation

The regulation starts when the suction pressure (AI1) increases and reaches the value
(SP-PB/2+(PB*PMI)/100) or (C16-C17/2+(C17*C24)/100). Within the adjustment range
(SP-PB/2~SP+PB/2) or (C16–C17/2 ~ C16+C17/2) the Digital scroll compressor is activated in
PWM mode in accordance with the value of the control variable.
When the pressure is higher than (SP + PB/2) or (C16 + C17/2) then the TRIAC output is at
maximum capacity. When the pressure is lower than (SP + PB/2) or (C16 + C17/2) but higher than
(SP-PB/2) the Digital Scroll compressor modulates the capacity according to the proportional
band. If the pressure is lower than (SP-PB/2)/ (C16-C17/2) the Digital Scroll compressor switches
off.
NOTE: When the digital valve on the compressor is deenergized the compressor is loaded.
NOTE: At start-up the valve is energized for C20 start-up time, i.e., time interval with the
digital valve energized before regulation starts. It ranges from 0 to 10 seconds (factory
setting = 5 seconds).
2.13 Reset to factory settings – Emerson "Hot Key"

2.13.1 How to save factory settings or user settings

There is no way to reset the XCM25D controller to factory settings other than with additional
equipment. Emerson recommends to use the Emerson "Hot Key" (not part of the standard
delivery) to save the factory settings at initial power up. The same hot key can also be used to
save user settings.
By means of a special programming software (Emerson Wizmate) and corresponding hardware
(Emerson Prog-Tool), the user can:

preprogram hot keys

copy hot keys

change parameter levels

compare parameter lists
For further information please visit our website at
Application Engineering representative.
22
www.emersonclimate.eu or contact your local
C6.1.9/0617/E