Airwell YAZE218, Service Manual

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11—2 | SM YAZE218 1-A.2 GB
11—CONTROL SYSTEM
SM YAZE218 1-A.2 GB | 11—3
11.2.6 Temperature Sensors
CTT – Compressor Top Temperature
OAT – Outdoor Air Temperature
OMT– Outdoor middle coil temperature
OCT – Outdoor Coil (heat exchanger) Temperature
HST – Heat Sink Temperature
RGT1..4 – Indoor Unit 1..4 Returned Gas Temperatures
RLT 1..4 – Indoor Unit 1..4 Returned Liquid Temperatures
11.2.7 Base Heater
Heating element designed to melt any ice that is accumulated on the outdoor unit base during
low heating operation.
11.3 General Operating Rules
11.3.1 Initialization
Initialization process is the rst operation done each time power is up. The targets of the
initialization are:
●
Addressing of IDU’s
● Identi cation of connected IDU’s
● IDU Matching Check
●
EEV’s homing (reset position)
● Restoring Parameters from EEPROM/Jumpers/Dipswitches
11.3.1.1 IDU’s Initialization
11.3.1.1.1 Capacity Codes Setting
The capacity groups of the IDU’s are translated into capacity codes according to the following
table:
Capacity group Capacity Code
2 . 1 ) w k 9 . 2 - 0 . 2 ( 0
5 . 1 ) w k 9 . 3 - 0 . 3 ( 1
7 . 1 ) w k 9 . 4 - 0 . 4 ( 2
2 ) 0 . 6 o t 0 . 5 ( 3
3 ) e v o b a d n a w k 1 . 6 ( 4
11.3.1.1.2 Indoor Total Capacity Test
This test is performed only for Multi split units.
The test comes to check the total IDU capacity code to match the outdoor unit capacity. The
capacity groups of the IDU’s are translated into capacity codes according to the
following table:
Capacity group Capacity Code
1 0
5 . 1 1
7 . 1 2
2 3
3 4