Initial Check - Hitachi KPI-252-2002E4E Installation And Operation Manual

INITIAL CHECK

6.2.2 PCB2 settings

DSW1: Optional functions
Factory setting
Pin 7: Common operation
of remote control switch
!
C A U T I O N
If there is an indoor unit connected in the same RCS line as DX-Inter-
face EXV-(2.0-10.0)E1 or KPI-(E/X)4E, then pin 7 must be ON to disable
the power supply to RCS line. If there is no indoor unit connected to the
same RCS line but there are more than one DX-Interface EXV-(2.0-10.0)
E1 or KPI-(E/X)4E, then only one DX-Interface EXV-(2.0-10.0)E1 or KPI-
(E/X)4E should have pin 7 OFF while all other units must have pin 7 set to
ON. Failure to perform this setting correctly will result in bad communica-
tion and can even cause physical damage to the PCB.
7 INITIAL CHECK
Before installation, check if dewing may occur in the heat
exchange element (the case that the line connecting the protted
points of the outdoor/indoor temperature and humidity conditions
crosses the saturation curve on the psychometric diagram).
In this case, heat the A (Outdoor Air) up to the A' point avoiding
that the line connecting the plotted points of the outdoor/indoor
temperature and humidity conditions crosses the saturation
curve, so that the total heat exchanger can be used.
The heating method for the A (Outdoor Air) must be determined
according to the local codes and regulations.
Saturation curve
Dry bulb (ºC)
16 PMML0371A rev.0 - 01/2016

DSW2: End resistance
No setting is required.
All units
1 2 3 4 5 6 7 8
1 2
1 2 3 4 5 6 7 8
The limit of the environmental conditions for using the total
heat exchanger are shown in the table below as an example, at
the outdoor air temperature 0 °C and -5 °C with the indoor air
temperature 30 °C and 25ºC
In case that the indoor air humidity is higher than this condition
or the outdoor air humidity is extremely high, dewing may occur.
The dew may grow up to the drop and the water may flow out of
the unit.
Outdoor Air
Temperature
(DB)
0ºC
-5ºC
-5ºC
Indoor Air
Indoor Air
Relative
Temperature
Humidity
(DB)
(%)
30ºC 50
30ºC 36
25ºC 45
Indoor Air
Absolute
Humidity
(kg/kg)
0.0133
0.0095
0.0089