Hitachi RCI-1.0FSN4 Service Manual page 82

2 Unit installation
KPI energy and KPI active unit
KPI-(252-2002)E4E energy recovery unit
Check that there is enough space around the unit. Consult the corresponding chapter of the Technical Catalogue for
information on the unit measurements.
Before starting installation, plan the direction of the pipes and wiring required. Also bear in mind that there must be
enough space around the unit for installation and maintenance.
Check that the ceiling surface where the unit is to be installed is completely horizontal.
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Installation
Avoid obstacles that could block the air inlet or outlet flow.
Choose a position in which the unit does not take in outdoor air mixed with combustion or exhaust fumes.
The unit must not be covered in snow.
Do not use the unit in the winter when the weather conditions may lead to the formation of condensation in the heat
exchanger.
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N O T E
• The formation of condensation arises if the line connecting the outdoor
and indoor temperature points and the conditions of humidity cross the
saturation curve in the psychrometric chart.
• Raising the temperature at point A (outdoor air) to point A' gives improved
conditions in which the line connecting the outdoor and indoor temperature
points and the conditions of humidity do not cross the saturation curve. In
this case, the total heat exchanger can be used.
The limit for ambient conditions in which the total heat exchanger is used is shown in the table below as an example, at
an outdoor air temperature of 0ºC, -5ºC and -10ºC and an indoor air temperature of 30ºC. Where the indoor or outdoor
air humidity is higher, condensation may accumulate and flow outside the unit.
The method for raising the temperature of A (outdoor temperature) must be determined according to current law in the
place where the unit is installed.
Outdoor Air Temperature
(DB)
0ºC
-5ºC
-5ºC
68 SMGB0099 rev.0 - 12/2016
(mm)
Indoor Air Temperature
(DB)
30ºC
30ºC
25ºC
KPI-(502-1002)X4E active unit
Dry bulb (ºC)
Indoor Air Relative Humidity
(%)
50
36
45
Saturation curve
Indoor Air Absolute Humidity
(kg/kg)
0.0133
0.0095
0.0089