149
17. Servicing Mode
17.1 Expansion Vessel Pre
Pressure Checking
[Upper limit water volume of the system]
The Mono bloc unit has a build-in Expansion Vessel
with 6 L air capacity and initial pressure of 1 bar.
Without antifreeze agent condition
Total amount of water in the system should be below
150 L.
If the total amount of water is more than 150 L, please
add expansion vessel (field supply).
With antifreeze agent condition
In the case of using antifreeze agent, expansion rate
ɛ
is different depending on its maker.
Please refer to the antifreeze agent maker for the
expansion rate
ɛ
before calculate the upper limit water
volume of the system.
The expansion vessel capacity required for the system
can be calculated from the formula below.
Water expansion rate table
Water temperature (°C)
Water expansion rate
Ɛ
10 0.0003
20 0.0019
30 0.0044
40 0.0078
50 0.0121
60 0.0171
70 0.0228
80 0.0291
90 0.0360
[Adjustment of the initial pressure of the expansion
vessel when there is a difference in installation height]
If the height difference between the Mono bloc unit
and the highest point of the system water circuit (H) is
more than 7m, please adjust the initial pressure of the
expansion vessel (Pg) according to the following
formula.
Pg= (H*10+30) kPa
17.2 Maintenance
In order to ensure optimal performance of the unit,
seasonal inspections on the unit, functional check
of RCCB, field wiring and piping have to be
carried out at regular intervals. This maintenance
should be carried out by authorized dealer.
17.2.1 Maintenance for Water Filter Set
1. Remove the Cover by loosening the mounting
screws to access to the Water Filter Set.
2. Turn OFF power supply.
3. Set the two valves for the Water Filter Set to
“CLOSE”.
4. Take off the clip, then gently pull out the mesh.
Beware of small amount water drain out from it.
5. Clean the mesh with warm water to remove all the
stain. Use soft brush if necessary.
6. Reinstall the mesh to the Water Filter Set and set
back the clip on it.
7. Set the two valves for the Water Filter Set to
“OPEN”.
8. Turn ON power supply.
9. After cleaning, reinstall the Cover by tightening the
mounting screws properly.
WARNING
Do not add or replace other than R410A type. It may cause
product damage, burst, injury and etc. Use compatible
R410A tools for refrigerant piping work and refrigerant
charging during installation or servicing.
V : Req
u
ired g
as
vol
u
me <exp
a
n
s
ion ve
ss
el vol
u
me L>
Vo :
S
y
s
tem tot
a
l w
a
ter vol
u
me <L>
: Exp
a
n
s
ion r
a
te 5
→
60˚C = (depend
s
on
a
ntifreeze
a
gent
us
ed)
P
1
: Exp
a
n
s
ion t
a
nk filling pre
ssu
re = (100) kP
a
P
2
:
S
y
s
tem m
a
xim
u
m pre
ssu
re = 300 kP
a
-
( ) Ple
as
e confirm
a
t
a
ct
ua
l pl
a
ce
-
The g
as
vol
u
me of the
s
e
a
led type exp
a
n
s
ion ve
ss
el i
s
pre
s
ented
b
y <V>
It
’s
a
dvi
s
ed to
a
dd 10
%
m
a
rgin for req
u
ired g
as
vol
u
me of c
a
lc
u
l
a
tion.
V =
x Vo
1 -
98 + P
1
98 + P
2
з
з
Mo
u
nting
s
crew
s
Cover
g