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8 Branching cannot be made after header branching (corresponding parts are
marked with X in the diagram below). *PQHY-P·Y(S)HM-A ONLY.
To the heat source unit
To the heat source
unit
9 Either a lack or an excess of refrigerant causes the unit to make an
emergency stop. Charge the system with an appropriate amount of
refrigerant. When servicing, always check the notes concerning pipe
length and amount of additional refrigerant at both locations, the refrigerant
volume calculation table on the back of the service panel and the additional
refrigerant section on the labels for the combined number of indoor units
(Refer to item 9.2. for detailed information on refrigerant piping system).
0 Be sure to charge the system using liquid refrigerant.
a Never use refrigerant to perform an air purge. Always evacuate using a
vacuum pump.
b Always insulate the piping properly. Insufficient insulation will result in a
decline in heating/cooling performance, water drops from condensation and
other such problems (Refer to item 10.4 for thermal insulation of refrigerant
piping).
c When connecting the refrigerant piping, make sure the valve of the heat
source unit is completely closed (the factory setting) and do not operate it
until the refrigerant piping for the heat source, indoor units and BC controller
has been connected, a refrigerant leakage test has been performed and the
evacuation process has been completed.
d Braze only with non-oxide brazing material for piping. Failure to do so
may damage the compressor. Be sure to perform the non-oxidation
brazing with a nitrogen purge.
Do not use any commercially available anti-oxidizing agent since it may
cause pipe corrosion and degrading of the refrigerant oil.
Please contact Mitsubishi Electric for more details.
(Refer to item 10.2. for details of the piping connection and valve operation)
e Never perform heat source unit piping connection work when it is
raining.
Warning:
When installing and moving the unit, do not charge the system with any
other refrigerant other than the refrigerant specified on the unit.
- Mixing of a different refrigerant, air, etc. may cause the refrigerant cycle to
malfunction and may result in severe damage.
Caution:
•
Use a vacuum pump with a reverse flow check valve.
- If the vacuum pump does not have a reverse flow check valve, the vacuum
pump oil may flow back into the refrigerant cycle and cause deterioration of
the refrigerant oil.
•
Do not use the tools shown below used with conventional refrigerant.
(Gauge manifold, charge hose, gas leak detector, check valve,
refrigerant charge base, vacuum gauge, refrigerant recovery
equipment)
- Mixing of conventional refrigerant and refrigerant oil may cause the
refrigerant oil to deteriorate.
- Mixing of water will cause the refrigerant oil to deteriorate.
- R410A refrigerant does not contain any chlorine. Therefore, gas leak
detectors for conventional refrigerants will not react to it.
•
Manage the tools used for R410A more carefully than normal.
- If dust, dirt, or water gets in the refrigerant cycle, the refrigerant oil will
deteriorate.
•
Never use existing refrigerant piping.
- The large amount of chlorine in conventional refrigerant and refrigerant oil
in the existing piping will cause the new refrigerant to deteriorate.
•
Store the piping to be used during installation indoors and keep both
ends of the piping sealed until just before brazing.
- If dust, dirt, or water gets into the refrigerant cycle, the oil will deteriorate
and the compressor may fail.
•
Do not use a charging cylinder.
- Using a charging cylinder may cause the refrigerant to deteriorate.
•
Do not use special detergents for washing piping.
9.2. Refrigerant piping system
Connection example
[Fig. 9.2.1] (P.4, 6)
CAP
A Heat source unit
C Indoor unit
E Heat source twinning kit
*1 ø12.7 for over 90 m
*2 ø12.7 for over 40 m
*3 The pipe sizes listed in columns A1 to A3 in this table correspond to the sizes
[Fig. 9.2.2] (P.5, 6)
A Heat source unit
C BC controller (main)
E Indoor unit (15 ~ 80)
G Heat source twinning kit
*1 The pipe sizes listed in columns A1 to A2 in this table correspond to the sizes
Precautions for heat source unit combinations
Refer to [Fig. 9.2.3] for the positioning of twinning pipes.
[Fig. 9.2.3] (P.7)
<A> When the piping on the heat source unit side (from the twinning pipe)
<B> Pipe connection example (for PQHY-P·Y(S)HM-A)
A
C
E
G
Precautions for heat source unit combinations
Refer to [Fig. 9.2.4] for the positioning of twinning pipes.
[Fig. 9.2.4] (P.7)
<A> The piping from the heat source units to twinning pipe must be made to
<B> Slope of twinning pipes (for PQHY-P·YSHM-A)
<C> Pipe connection example (for PQRY-P·YSHM-A)
A
C
E
F
H
I
J
Heat source model
Gas side
Liquid pipe
Model number
The 1st branch of P450 ~ P650
Joint
4-Branching header (Downstream unit model total <= 200)
8-Branching header (Downstream unit model total <= 400)
10-Branching header (Downstream unit model total <= 650)
Heat source twinning kit
B First branch
D Cap
for the models listed in the unit 1, 2, and 3 columns. When the order of the
models for unit 1, 2, and 3 change, make sure to use the appropriate pipe size.
Heat source model
Low-pressure side
Liquid pipe
Model number
Heat source twinning kit
Low-pressure gas pipe
B BC controller (standard)
D BC controller (sub)
F Indoor unit (100 ~ 250)
for the models listed in the unit 1 and 2 columns. When the order of unit 1 and
2 is changed, make sure to use the appropriate pipe size for the model.
exceeds 2 m, ensure a trap (gas pipe only) within 2 m. Make sure the height
of the trap is 200 mm or more.
If there is no trap, oil can accumulate inside the pipe, causing a shortage of
oil and may damage the compressor. (for PQHY-P·YSHM-A)
Indoor unit
B
Within 2 m
D
Pipes on site
F
Straight run of pipe that is 500 mm or more
slope downwards the twinning pipe. (both the liquid and the gas side for
PQHY-P·YSHM-A, the high-pressure side only for PQRY-P·YSHM-A)
Make sure the slope of the twinning pipes are at an angle within ±15° to the
horizontal plane.
If the slope exceeds the specified angle, the unit may be damaged.
Downward slope
B
BC controller (standard or main)
D
Slope of the twinning pipe is at an angle within ±15° to the ground
Twinning pipe (low-pressure side)
G
On-site piping (low-pressure connecting pipe: between heat source units)
On-site piping (low-pressure main pipe: to BC controller)
On-site piping (high-pressure main pipe: to BC controller)
Liquid side
Total capacity of indoor units
Gas pipe
Downstream unit model total
The 1st branch of P700, P750, P800
High-pressure side
Total capacity of indoor units
Gas pipe
Downstream unit model total
High-pressure gas pipe
Trap (gas pipe only)
Twinning pipe
Twinning kit
Upward slope
Twinning pipe
Twinning pipe (high-pressure side)
21
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