11-15
CONTROL SYSTEM
SM DUO38I 1-A.2 GB
11.22 Test
Mode
11.22.1
Entering Test Mode
System can enter Test mode in two ways:
Automatically when the following conditions exists for 30 minutes continuously:
o
Mode = Cool, Set point = 16, Room temperature = 27±1, Outdoor temperature =
35±1
Or
o
Mode = Heat, Set point = 30, Room temperature = 20±1, Outdoor temperature =
7±1
Manually when entering diagnostics with the following settings:
o
Mode = Cool, Set point = 16
o
Mode = Heat, Set point = 30
11.22.2
Unit Operation in Test Mode
In test mode, the unit will operate in fixed settings according to the indoor fan speed setting
:
Indoor Fan Speed Setting
Unit Setting
Low
Minimum Capacity Setting
High
Nominal Capacity Setting
Auto
Maximum Capacity Setting
During test mode, protections are disabled, except for stop compressor status.
11.23
Additional Functions and Operating Rules (for DUAL
split models)
The DCI SW is fully parametric.
All the model dependent parameters are shown in Blue color and with Italic style
[
parameter
].
The parameters values are given in the last section of this control logic chapter of the
service manual.
11.23.1
System Control Concept
All indoor unit related items control remains the same as in single split applications.
All outdoor unit related control logic remains the same as in single split applications.
The MSMP controller is responsible only for the following control:
Setting of system operation mode (cool/heat)
Setting the NLOAD for the outdoor units
Controlling of the EEV’s
Dry contacts control
11.23.2
Compressor Frequency Control
11.23.3
Outdoor Unit NLOAD setting
The MSMP controller gets the NLOAD from each of the indoor units, and sends a combined
NLOAD to the outdoor unit control. The combined NLOAD is a weighted average of the
indoor units NLOAD.
The weight of the indoor units as a function of their nominal capacity:
Indoor Unit Capacity [kW] (kBtu/hr)
Capacity Code
2.5 (9000)
1
3.5 (12000)
1.5
5.0 (18000)
2
7.2 (24000)
3
