Airwell PNX 012, Руководство по обслуживанию

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11-13
CONTROL SYSTEM
SM YAZDCI 1-A.1 GB
11.5.3 EEV Control
11.5.3.1 Operation Range
The EEV operation range is defined according to the operation mode as following
ODU Mode Normal operation IDU inactive Compressor off
SB
400
400
COOL
50
to
480
0
HEAT
50
to
480 50
to
120
11.5.3.2 Reaching target value rules
For all cases except at EEV initialization procedure, each EEV can move no more than
20
steps
at a time.
When required the EEV’s move, one by one in sequence, till the target position is achieved for
every EEV.
The following diagram presents the EEV steps till the target position is set.
EEV1 EEV2 EEV3 EEV4 EEV1 EEV3 EEV4 EEV3 EEV4 EEV3 EEV3
EEV2
set EEV1
set EEV4
set EEV3
set
11.5.3.3 EEV homing
When compressor stops or unit is power on, the following is performed immediately:
All EEV’s are set to
- 400.
They remain in this position for
-
80
Sec.
Then, close to 60 steps below 0 to ensure full closure, then proceed to normal operation
-
11.5.3.4
EEV Opening Determination
The target EEV value is the sum of open loop value (OL) and a result of the accumulative
correction values (CV).

 
CVi OLi i
EEV EEV EEV
EEVi
is the EEV opening for each ‘i’ IDU.
11.5.3.5 EEV initial value determination
The EEV initial value (open loop) is determined according to the number of the active indoor
units, mode, and the capacity code of the unit.
EEVBase
Base open loop
(Nominal Conditions/Capacity Code=1/MaxFrequency)
EEVCpctyCrct
Capacity code correction
Unit Type
ODU
Mode
Number of active IDU units IDU Capacity Group
1 2 3 4 0 1 3 4
Multi
(Active IDU)
COOL 250 210 170 150 0 25 80 110
HEAT 230 190 150 130 0 25 90 110
Multi
(In Active IDU)
Cool NA NA
Heat 90 0