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8 Indoor units cannot be further branched down stream after the branch
header. (See diagram below.) *PQHY-P·T(S)HMU-A/Y(S)HMU-A ONLY.
To the heat source unit
To the heat source
unit
9 A lack or an excess of refrigerant can cause the unit to stop. Charge the
system with the appropriate amount of refrigerant. When servicing, always
check the information concerning pipe length and amount of additional
refrigerant at 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 Charge the system using liquid refrigerant.
a Never use refrigerant to air purge. Always evacuate using a vacuum
pump.
b Always insulate the piping properly. Insuf¿ cient insulation will result in
a decline in heating/cooling performance, condensation and other such
problems (Refer to item 10.4 for insulation of the 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 unit, 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-oxided material. Failure to do so may damage the
compressor. Braze using nitrogen purge.
Do not use any commercially available anti-oxidizing agent, because it
may cause pipe corrosion and degrade the refrigerant oil.
Contact Mitsubishi Electric for more details.
(Refer to item 10.2. for details of the piping connection and valve operation)
e Never perform piping connections when raining.
Warning:
When installing and relocating the unit, do not charge the system with any
other refrigerant other than what is speci¿ ed.
- Mixing different refrigerant, air, etc. may cause the refrigerant cycle to
malfunction and result in severe damage.
Caution:
•
Use a vacuum pump with a reverse À ow check valve.
- If the vacuum pump does not have a reverse À ow check valve, the vacuum
pump oil may À ow 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 tools used for R410A carefully.
- 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 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 get 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 to wash the piping.
20
9.2. Refrigerant piping system
Example of refrigerant piping system
[Fig. 9.2.1] (P.4)
CAP
A Heat source unit
C Indoor unit
E Heat source twinning kit
*1 ø12.7 for over 90 m [295-1/4in]
*2 ø12.7 for over 40 m [131-3/16in]
*3 The pipe sizes listed in columns A1 to A3 in this table correspond to the sizes
[Fig. 9.2.2] (P.5)
A Heat source unit
C BC controller (main)
E Indoor unit (06 ~ 54)
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 (from the twinning pipe) exceeds 2 m [6 ft], include a trap
<B> Example of piping connection (for PQHY-P·TSHMU-A/YSHMU-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·TSHMU-A/YSHMU-A)
<C> Example of piping connection (for PQRY-P·TSHMU-A/YSHMU-A)
A
C
E
F
H
I
J
Heat source model
Liquid side
Gas side
Total capacity of indoor units
Liquid pipe
Gas pipe
Model number
Downstream unit model total
The ¿ rst branch of P144 ~ P240
The ¿ rst branch of P264 ~ P360
Joint
4-Branch header (Downstream indoor unit model total <= 72)
8-Branch header (Downstream indoor unit model total <= 144)
10-Branch header (Downstream indoor unit model total <= 234)
Heat source twinning kit
B 1st branch
D Cap
F Header
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
High-pressure side
Low-pressure side
Total capacity of indoor units
Liquid pipe
Gas pipe
Model number
Downstream unit model total
Heat source twinning kit
High-pressure gas pipe
Low-pressure gas pipe
B BC controller (standard)
D BC controller (sub)
F Indoor unit (72 ~ 96)
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.
(gas pipe only) within 2 m [6 ft]. Make sure the height of the trap is 200 mm
[7-7/8 in] or more.
If there is no trap, oil can accumulate inside the pipe, causing a shortage of
oil damaging the compressor. (for PQHY-P·TSHMU-A/YSHMU-A)
B
Indoor unit
Trap (gas pipe only)
D
Within 2 m [6 ft]
Twinning pipe
F
Field-supplied piping
Twinning kit
Straight pipe length that is 500 mm [19-11/16 in] or more
slope downwards the twinning pipe. (both the liquid and the gas side for
PQHY-P·TSHMU-A/YSHMU-A, the high-pressure side only for PQRY-
P·TSHMU-A/YSHMU-A)
Make sure the slope of the twinning pipes are at an angle within ±15° to the
horizontal plane.
If the slope exceeds the angle speci¿ ed, the unit may be damaged.
B
Slope downward
Slope upward
D
BC controller (standard or main)
Twinning pipe
Slope of the twinning pipe is at an angle within ±15° to the ground
G
Twinning pipe (low-pressure side)
Twinning pipe (high-pressure side)
Field-supplied piping (low-pressure connecting pipe: between heat source
units)
Field-supplied piping (low-pressure main pipe: to BC controller)
Field-supplied piping (high-pressure main pipe: to BC controller)
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