Specifications

The two-pipe zoned system designed for Heat
Pump Operation
The CITY MULTI S series (for small applications) and Y series (for large applications) make use of a two-pipe
refrigerant system, which allows for system changeover from cooling to heating, ensuring that a constant indoor
climate is maintained in all zones. The compact outdoor unit utilizes R410A refrigerant and an INVERTER-driven
compressor to use energy effectively.
With a wide line-up of indoor units in connection with a flexible piping system, the CITY MULTI series can be
configured for all applications. Up to 12 (S series) or 50 (Y series) indoor units can be connected with up to 130%
connected capacity to maximize engineer's design options. This feature allows easy air conditioning in each area
with convenient individual controllers.
S (Heat Pump) series
Y (Heat Pump) series
Cooling or Heating
Small Offices (S series) Large Offices (Y series)
System Pipe Lengths
Outdoor unit
Indoor unit
Between indoor units
top-bottom differential
15m [49ft]
Furthest piping length
190m [623ft] (equivalent length)
(actual length 165m [541ft])
Header
Joint
Outdoor unit
[8-50HP (Y series)]
[8-36HP (High COP Y series)]
Top-bottom differential
50m [164ft] *1
.*1 Depending on the model and installation conditions, top-bottom differential 90m [295ft] (o/u
above) and 60m [196ft] (o/u below) is available. For more detailed information, please contact
your nearest sales office or distributor.
.*2 4m or less in cooling at outdoor temperature 10͠ QT NQYGT for PUHY-P-YHA (-BS) only.
Refrigerant Piping Lengths
Total length
Maximum allowable length
Farthest indoor from first branch
Vertical differentials between units
Indoor/outdoor (outdoor higher)
Indoor/outdoor (outdoor lower)
Indoor/indoor
Maximum meters [Feet]
120 [393]
80 [262]
30 [98]
Maximum meters [Feet]
50 [164]
20 [65]
12 [39]
Refrigerant Piping Lengths
Total length
Maximum allowable length
Farthest indoor from first branch
Vertical differentials between units
Indoor/outdoor (outdoor higher)
Indoor/outdoor (outdoor lower)
Indoor/indoor
Maximum meters [Feet]
1,000 [3,280]
165 (190equivalent)
[541(623)]
40 [131]
Maximum meters [Feet]
50 [164]*1
40 [131]*1, *2
15 [49]
Outdoor unit
Indoor unit
Between indoor units
top-bottom differential
12m [39ft]
Furthest piping length
80m [262ft]
[4-6HP (S series)]
PUMY-P VHMB(-BS)
PUMY-P YHMB(-BS)
S series
PUHY-P YHA(-BS)
PUHY-P YSHA(-BS)
PUHY-EP YJM-A(-BS)
PUHY-EP YSJM-A(1)(-BS)
Y series
Outdoor unit
Top-bottom differential
50m [164ft]
Top-bottom differential
50m [164ft]
O utdoor unit
Heat Pump Series (Y)
Heat Pump Series (S)
Heat Pump Series - High COP (Y)
Page 71 Page 72
Outdoor Unit