11-11
CONTROL SYSTEM
SM YAZDCI 1-A.1 GB
11.5.2.2
Compressor Speed calculation
During normal operation (excluding protections), the compressor speed is limited by the
following table:
Min Speed
Cool (check)
Max Speed
Cool
Min Speed
Heat
Max Speed
Heat
15
80
15
95
11.5.2.3
Indoor Units NLOAD calculation
The NLOAD setting is done by the indoor unit controller, based on a PI control scheme.
The actual NLOAD to be sent to the outdoor unit controller is based on the preliminary LOAD
calculation, the indoor fan speed, and the power shedding function.
NLOAD limits as a function of indoor fan speed:
Indoor Fan Speed
Maximum NLOAD Cooling
Maximum NLOAD Heating
Low
Max NLOADIF1C
127
Medium
Max NLOADIF2C
127
High
Max NLOADIF3C
127
Turbo
Max NLOADIF4C
127
Auto
Max NLOADIF5C
127
NLOAD limits as a function of power shedding:
Mode
Power Shedding OFF
Power Shedding ON
Cool
No limit
Nominal Cooling
Heat
No limit
Nominal Heating