Johnson Controls (H,Y)VAHP072B31CW, Installation And Maintenance Manual

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40
P00877Q
Item Mark
Allowable Piping Length
< the recommended
number of connected
indoor
unit
> the recommended
number of connected
indoor
unit
Total Piping Length - < 1,640 ft (500m) < 984 ft (300m)
Maximum Piping Length
Actual Length
L1
< 541 ft (165m) < 541 ft (165m)
Equivalent Length < 623 ft (190m) < 623 ft (190m)
Maximum Piping Length between
Multi-kit of 1st Branch and Each Indoor Unit
L2 < 295 ft (90m) < 131 ft (40m)
Maximum Piping Length between
Each Multi-kit and Each Indoor Unit
L3 < 131 ft (40m) < 98 ft (30m)
Piping Length between Piping Connection Kit 1 and
Each Outdoor Unit
La, Lb, Lc < 32 ft (10m) < 32 ft (10m)
Height Difference between
Outdoor Units and Indoor Units
O.U. is Higher
H1
< 164 ft (50m) < 164 ft (50m)
O.U. is Lower < 131 ft (40m) < 131 ft (40m)
Height Difference between Indoor Units H2 < 98 ft (30m) < 98 ft (30m)
Height Difference between Outdoor Units H5 < 0.3 ft (0.1m) < 0.3 ft (0.1m)
Outdoor Unit Capacity (MBH) 72, 96 144 - 192 288
Max. Additional Refrigerant Charge: lbs (kg) 61.7 (28) 112.5 (51) 138.9 (63)
Comply with the following conditions when installing the unit.
1. For a combination of two or three outdoor units, the outdoor unit “A” should be connected to the piping connection of Kit 1.
(Refer to Section 6.4 for outdoor unit models.) Refer to the Piping Kit Installation Manual for piping details.
2. The piping length between outdoor units should be La < Lb < Lc < 32.8 ft (10m).
(If the piping length is incorrect, there may be a failure of outdoor units caused by a refrigerant back-up.)
3. Maintain a straight-line distance of 19-11/16 inch (500mm) or more for piping after the piping connection kit.
4. The condition of refrigerant piping installation is different depending on the connected number of indoor units.
Refer to Table 3.2 “System Combination” above for details.
5. Allowable total piping length may not exceed 1,640 ft (500m) because of the limitation of maximum additional
refrigerant amount as described in the following table. Make sure that the additional refrigerant volume does not
exceed the maximum additional refrigerant amount as shown below.
6. If the piping length (L3) between each multi-kit and indoor unit is considerably longer than other indoor unit, refrigerant
PD\QRWÀRZZHOOOHVVHQLQJSHUIRUPDQFHFRPSDUHGWRRWKHUPRGHOV
(Recommended Piping Length: Within 49.2 ft (15m))
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“Piping Branch Restrictions”, Section 6.5.
8. When installing Energy Recovery Ventilation in the system, the piping length between Energy Recovery Ventilation
and the outdoor unit must be within 49.2 ft (15m).
9. When completing on-site piping, install bent piping or horizontal loop piping to absorb any expansion or contraction
due to changing temperatures.
NOTICE