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Master outside unit Main Board - External Board
1
4
5
*
communication Error
Failure of operation mode conversion at Master
1
5
1
*
Outside Unit
Plate type heat exchanger freeze prevention
1
8
0
*
Water temperature sensor error
1
8
1
*
Communication error between MICOMs of exter-
1
8
2
*
nal pcb
2
0
0
1
Searching pipe Error
2
0
1
#h
HR unit1 Liqiud sensor error
2
0
2
#h
HR unit1 Sub Cooling Pipe sensor error
2
0
3
#h
HR unit1 Sub Cooling Pipe Out sensor error
2
0
4
#h
Communication error
CAUTION FOR REFRIGERANT LEAK
The installer and system specialist shall secure safety against leakage
according to local regulations or standards.
The following standards may be applicable if local regulations are not
available.
Introduction
Though the R410A refrigerant is harmless and incombustible itself ,
the room to equip the air conditioner should be large to such an extent
that the refrigerant gas will not exceed the limiting concentration even
if the refrigerant gas leaks in the room.
Limiting concentration
Limiting concentration is the limit of Freon gas concentration
where immediate measures can be taken without hurting human
body when refrigerant leaks in the air. The limiting concentration
shall be described in the unit of Kg/m
per unit air volume) for facilitating calculation.
Limiting concentration: 0.44kg/m
Outside unit
Flow of
(No.1 system)
refrigerant
Indoor unit
Checking procedure of limiting concentration
Check limiting concentration along following steps and take appropri-
ate measure depending on the situation.
Calculate amount of all the replenished refrigerant (kg) per each refrig-
erant system.
Amount of replenished
Amount of additional
+
replenished refrigerant
refrigerant per one outside
unit system
Amount of replenished
Amount of additionally
refrigerant at factory shipment
replenished refrigerant
depending on piping
length or piping
diameter at customer
Title
3
3
(lbs/ft
) (Freon gas weight
3
3
(0.028lbs/ft
)(R410A)
Room where refrigerant leaks
(Refrigerant of the whole No.1
system flows out.)
Total amount of replenished
=
refrigerant in refrigerant
facility (kg)
Note : In case one refrigerant facility is
divided into 2 or more refrigerant
systems and each system is
independent, amount of replenished
refrigerant of each system shall be
adopted.
Cause of Error
Master outside unit Main Board - External Board communication
Error
Failure of operation mode conversion at Master Outside Unit
Plate type heat exchanger freeze prevention error
Water temperature sensor open/short
Communication error between main MICOM and sub MICOM of
external pcb
Failure of automatic addressing of valves
Liquid pipe sensor of HR unit open or short
Sub Cooling Pipe In sensor of HR unit open or short
Sub Cooling Pipe Out sensor of HR unit. open or short
Failing to receive HR unit signal at outside unit
Calculate minimum room capacity
Calculate room capacity by regarding a portion as one room or the
smaller room.
- Without partition
Outside unit
Indoor unit
- With partition and without opening which serve as passage of air to
adjoining room
Smallest
room
Calculate refrigerant concentration
Total amount of replenishedrefrigerant
in refrigerant facility [kg(lbs)]
Capacity of smallest room
3
whereindoor unit is installed [m
(ft
- In case the result of calculation exceeds the limiting concentration, perform
the same calculations by shifting to the second smallest, and the third small-
est rooms until at last the result is below the limiting concentration.
- With partition and with opening
which serve as passage of air to
adjoining room
Outside unit
In the case of opening
Indoor unit
without door , or 0.15
Opening
% or more openings
(to floor space) both
Partition
above and below door)
Outside unit
Indoor unit
3
= Refrigerant concentration[Kg/m
(lbs/ft
3
)]
(R410A)
3
)]
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