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9. Refrigerant piping installation
9.1. Caution
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pipe thickness when selecting pipes.
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system.
2
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clean with a dry inert gas.
3
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piping during installation.
4
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bending radii as big as possible.
5
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Indoor twinning pipe kit model
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Line branch
Total indoor model
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Less than 30 in total
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Total heat source model
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Total heat source model
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branched sections are brazed.
Warning:
Do not use refrigerant other than the type indicated in the manuals
provided with the unit and on the nameplate.
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Always use extreme care to prevent the refrigerant gas from leaking while
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from any source, such as a gas stove, it breaks down and generates
a poisonous gas which can cause gas poisoning. Never weld in an
unventilated room. Always conduct an inspection for gas leakage after
installation of the refrigerant piping has been completed.
2
Water quality standard
Items
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temperature water system
Tendency
Recirculating
water
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>7)@
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water
Corrosive
Scale
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Standard
items
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a
a
c
c
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30 or less
[300 or less]
30 or less
[300 or less]
c
c
Chloride ion
(mg Cl
Ɛ
50 or less
50 or less
c
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PJ62
Ɛ
50 or less
50 or less
c
$FLGFRQVX
(mg
CaCO
3
Ɛ
50 or less
50 or less
c
Total hardness (mg CaCO
3
Ɛ
70 or less
70 or less
c
Calcium hardness (mg CaCO
3
Ɛ
50 or less
50 or less
c
Ionic silica
(mg SiO
2
Ɛ
30 or less
30 or less
c
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ence
items
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PJ)HƐ
1.0 or less
0.3 or less
c
c
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PJ&XƐ
1.0 or less
0.1 or less
c
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PJ6
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not to be
detected
not to be
detected
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Ammonium ion
(mg NH
Ɛ
0.3 or less
0.1 or less
c
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PJ&OƐ
0.25 or less
0.3 or less
c
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Consult with a specialist about water quality control methods and
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4
When replacing a previously installed air conditioning device (even when
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replacing the unit.
8.4. Pump
interlock
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circulating through the pipes.
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EORFNVIRULQWHUORFNLQJ7%WKDWFDQEHIRXQGRQWKHXQLW
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5mA or less to prevent miss detection due to poor connection.
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[Fig. 8.4.1] (P.4)
A
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[Fig. 8.4.2] (P.4)
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circuit pump.
A
Heat source unit
B
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X :
Relay
FS :
Flow
switch
3
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MP
: Water circuit pump
MCB :
Circuit
breaker
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Terminal
No.
7%
Output
Relay contacts output
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Rated load: 1A
Operation
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21
is OFF.
The relay closes during compressor operation.
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1
2
3
5
7
10
1
0
1
0
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