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8.4. Pump interlock
The heat source unit may become damaged if it is operated with no water
circulating through the pipes.
Be sure to 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 flexible cord (design 245 IEC 57).
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: flare connection for the indoor units,
Gas (low-pressure for PQRY-P·Y(S)HM-A) pipes and Liquid (high-pressure for
PQRY-P·Y(S)HM-A) pipes for heat source, brazed connection. Note that the
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.
- Doing so may cause the unit or pipes to burst, or result in explosion or fire
during use, during repair, or at the time of disposal of the unit.
- It may also be in violation of applicable laws.
- MITSUBISHI ELECTRIC CORPORATION cannot be held responsible
for malfunctions or accidents resulting from the use of the wrong type of
refrigerant.
Always use extreme care to prevent the refrigerant gas from leaking while
using fire or flame. If the refrigerant gas comes in to contact with a flame
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.
Caution:
•
Do not vent R410A into the atmosphere.
•
R410A is a Fluorinated Greenhouse gas, covered by the Kyoto Protocol
with a Global Warming Potential (GWP) = 1975.
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 inner and outer 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 Commercially available 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.
20
[Fig. 8.4.1] (P.3)
Short-circuit wire (Connected before delivery from manufacturer)
A
Pump interlock circuit connection
B
[Fig. 8.4.2] (P.3)
This circuit is for interlocking of the heat source unit operation and the mater-
circuit pump.
Heat source unit
A
To next unit
C
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.
5 For indoor and heat source branching and merging section, be sure to use
the following twinning pipe sets and merge pipe sets (sold separately).
Indoor twinning pipe
Indoor junction pipe
kit model PQRY-
kit model PQRY-
P·Y(S)HM-A ONLY
P·Y(S)HM-A ONLY
Line branch
Lower stream unit
Total indoor model
model
P100 ~ P250
Less than 80 in total
CMY-Y102SS-G2
CMY-R160-J1
Copper pipe size and radial thickness for R410A CITY MULTI.
Size (mm)
Size (inch)
Radial thickness (mm)
ø6.35
ø1/4
ø9.52
ø3/8
ø12.7
ø1/2
ø15.88
ø5/8
*ø19.05
ø3/4
*ø19.05
ø3/4
ø22.2
ø7/8
ø25.4
ø1
ø28.58
ø1-1/8
ø31.75
ø1-1/4
ø34.93
ø1-3/8
ø41.28
ø1-5/8
* Both pipe types can be used for pipe size ø19.05 (3/4 inch) for R410A air
conditioner.
6 Use a fitting if a specified refrigerant pipe has a different diameter from that
of a branching pipe.
7 Always observe 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·Y(S)HM-A ONLY
Line branch
Lower stream unit
Lower stream unit
model
model
More than 201
Less than 200 in
and less than 400
total
in total
CMY-Y102SS-G2
CMY-Y102LS-G2
Indoor twinning pipe set model PQHY-P·Y(S)HM-A ONLY
Header branch
4 branching
8 branching
CMY-Y104-G
CMY-Y108-G
Heat source twinning kit model PQHY-P·Y(S)HM-A ONLY
Total heat source model
Total heat source model
P400 ~ P600
CMY-Y100VBK2
Site control panel
B
Heat source twinning
kit model PQRY-
P·Y(S)HM-A ONLY
Total heat source
model
P400 ~ P600
CMY-Q100VBK
Pipe type
0.8
Type-O
0.8
Type-O
0.8
Type-O
1.0
Type-O
1.2
Type-O
1.0
Type-1/2H or H
1.0
Type-1/2H or H
1.0
Type-1/2H or H
1.0
Type-1/2H or H
1.1
Type-1/2H or H
1.2
Type-1/2H or H
1.4
Type-1/2H or H
Lower stream unit
Lower stream unit
model
model
More than 401
More than 651 in
and less than 650
total
in total
CMY-Y202S-G2
CMY-Y302S-G2
10 branching
CMY-Y1010-G
P650 ~ P900
CMY-Y300VBK2
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