Table des Matières
Publicité
2 Water quality standard
Items
pH (25°C) [77°F]
Electric conductivity (mS/m) (25°C) [77°F]
( s/cm) (25°C) [77°F]
Chloride ion
(mg Cl-/ )
2-
Sulfate ion
(mg SO4
Standard
items
Acid consumption (pH4.8)
(mg CaCO
3
Total hardness
(mg CaCO
3
Calcium hardness (mg CaCO
3
Ionic silica
(mg SiO
2
Iron
(mg Fe/ ) 1.0 or less
Copper
(mg Cu/ ) 1.0 or less
2-
Sul¿ de ion
(mg S
Refer-
ence
+
Ammonium ion
(mg NH
4
items
Residual chlorine
(mg Cl/ ) 0.25 or less
Free carbon dioxide
(mg CO
2
Ryzner stability index
Reference : Guideline of Water Quality for Refrigeration and Air Conditioning
Equipment. (JRA GL02E-1994)
3 Consult with a specialist about water quality control methods and
calculations before using anti-corrosive solutions.
4 When replacing a previously installed air conditioning device (even when
only the heat exchanger is being replaced), ¿ rst conduct a water quality
analysis and check for possible corrosion.
Corrosion can occur in cold-water systems even if there has been no
prior signs of corrosion.
If the water quality level has dropped, adjust water quality before
replacing the unit.
9. Refrigerant piping installation
The pipe is connected via a terminal-branch type connection in which refrigerant
piping from the heat source unit is branched at the terminal and is connected to
each of the indoor units.
The method of pipe connection is as follows: À are connection for the indoor units,
Gas (low-pressure for PQRY-P·T(S)HMU-A/Y(S)HMU-A) pipes and Liquid (high-
pressure for PQRY-P·T(S)HMU-A/Y(S)HMU-A) pipes for heat source, brazed
connection. Note that the branched sections are brazed.
Warning:
Always use extreme care to prevent the refrigerant gas from leaking while
using ¿ re or À ame. If the refrigerant gas comes in to contact with a À ame
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.
9.1. Caution
This unit uses refrigerant R410A. Follow the local regulations on materials and
pipe thickness when selecting pipes. (Refer to the table below.)
1 Use the following materials for refrigeration piping.
•
Material: Use copper alloy seamless pipes made of phosphorus
deoxidized copper. Ensure the inside and outside surfaces of
the pipes are clean and free from hazardous sulfur, oxide, dusts,
shaving particles, oils, and moisture (contamination).
•
Size: Refer to item 9.2. for detailed information on refrigerant piping
system.
2 Field-supplied piping often contains dust and other materials. Always blow it
clean with a dry inert gas.
3 Use care to prevent dust, water or other contaminants from entering the
piping during installation.
4 Reduce the number of bending portions as much as possible, and make
bending radii as big as possible.
5 For branching and connecting pipes for indoor and heat source units, use
the following twinning and connecting pipe sets (sold separately).
Indoor twinning pipe
Indoor junction pipe
kit model PQRY-
kit model PQRY-
P·T(S)HMU-A/
P·T(S)HMU-A/
Y(S)HMU-A ONLY
Y(S)HMU-A ONLY
Line branch
Total indoor model
Down-stream unit
model
P72, P96
Less than 30 in total
CMY-Y102S-G2
CMY-R160-J
Low to mid-range
Tendency
temperature water system
Recirculating
water
Make-up
Scale-
Corrosive
[20<T<60°C]
water
forming
[68<T<140°F]
c
c
7.0 ~ 8.0
7.0 ~ 8.0
30 or less
30 or less
c
c
[300 or less]
[300 or less]
c
50 or less
50 or less
c
/ )
50 or less
50 or less
c
50 or less
50 or less
/ )
c
/ )
70 or less
70 or less
c
/ )
50 or less
50 or less
c
/ )
30 or less
30 or less
c
c
0.3 or less
c
0.1 or less
not to be
not to be
c
/ )
detected
detected
c
/ ) 0.3 or less
0.1 or less
c
0.3 or less
c
/ ) 0.4 or less
4.0 or less
c
c
6.0 ~ 7.0
–
Heat source twinning
kit model PQRY-
P·T(S)HMU-A/
Y(S)HMU-A ONLY
Total heat source
model
P144 ~ P240
CMY-Q100VBK
8.4. Pump interlock
The heat source unit may become damaged if it is operated with no water
circulating through the pipes.
Interlock unit operation and the water-circuit pump. Use the terminal
blocks for interlocking (TB8-1, 2, 3, 4) that can be found on the unit.
In the case of a pump interlock circuit signal connection to the TB8-3, 4, remove
the short-circuit wire. Also, use pressure valve 63PW with a minimum current of
5mA or less to prevent miss detection due to poor connection.
Pump interlock cords of parts of appliances for heat source use shall not be
lighter than polychloroprene sheathed À exible cord (design 245 IEC 57).
[Fig. 8.4.1] (P.3)
A
Short-circuit wire (Connected before delivery from manufacturer)
B
Pump interlock circuit connection
[Fig. 8.4.2] (P.3)
This circuit is for interlocking of the heat source unit operation and the mater-
circuit pump.
A
Heat source unit
C
To next heat source unit
TM1, 2 : Timer relay (closes after elapsing the set time when it is
powered, while opens promptly when it is not powered)
52P
: Magnetic contactor for water circuit pump
MP
: Water circuit pump
MCB
: Circuit breaker
* Remove the short circuit wire between 3 and 4 when wiring to TB8.
Copper pipe size and radial thickness for R410A CITY MULTI.
Radial thickness
Size (mm) Size (inch)
(mm)
ø6.35
ø1/4"
0.8
ø9.52
ø3/8"
0.8
ø12.7
ø1/2"
0.8
ø15.88
ø5/8"
1.0
*ø19.05
ø3/4"
1.2
*ø19.05
ø3/4"
1.0
ø22.2
ø7/8"
1.0
ø25.4
ø1"
1.0
ø28.58
ø1-1/8"
1.0
ø31.75
ø1-1/4"
1.1
ø34.93
ø1-3/8"
1.2
ø41.28
ø1-5/8"
1.4
* Both pipe types can be used for pipe size ø19.05 (3/4 inch) for R410A air
conditioner.
6 Use a ¿ tting if a speci¿ ed refrigerant pipe has a different diameter from that
of a branching pipe.
7 Follow the restrictions on the refrigerant piping (such as rated length, height
difference, and piping diameter) to prevent equipment failure or a decline in
heating/cooling performance.
Indoor twinning pipe set model PQHY-P·T(S)HMU-A/Y(S)HMU-A ONLY
Line branch
Down-stream unit
Down-stream unit
model
model
More than 73 and
Less than 72 in
less than 144 in
total
total
CMY-Y102S-G2
CMY-Y102L-G2
Indoor twinning pipe set model PQHY-P·T(S)HMU-A/
Y(S)HMU-A ONLY
Header branch
4 branching
8 branching
CMY-Y104-G
CMY-Y108-G
Heat source twinning kit model PQHY-P·T(S)HMU-A/
Y(S)HMU-A ONLY
Total heat source model
Total heat source model
P144 ~ P240
CMY-Y100VBK2
CMY-Y300VBK2
B
Control panel (¿ eld-supplied)
Radial thickness
Pipe type
(mil)
32
Type-O
32
Type-O
32
Type-O
40
Type-O
48
Type-O
40
Type-1/2H or H
40
Type-1/2H or H
40
Type-1/2H or H
40
Type-1/2H or H
44
Type-1/2H or H
48
Type-1/2H or H
56
Type-1/2H or H
Down-stream unit
Down-stream unit
model
model
More than 145
More than 241 in
and less than 240
total
in total
CMY-Y202-G2
CMY-Y302-G2
10 branching
CMY-Y1010-G
P264 ~ P360
19
Publicité
Chapitres
Table des Matières
