Daikin VRV IV - Page 96

18 | Piping installation
Installer and user reference guide
96
RXMLQ8 + RXYLQ10~14T7Y1B*
VRV IV system air conditioner
4P543427-1A – 2020.10
Parameter A
Piping length
(a)
CR A
8 HP 10~14 HP
≤30m 105%<CR≤130% 0.5kg
>30m 105%<CR≤130% 1.2kg 1.5kg
(a) Piping length is considered the distance from the outdoor unit to the farthest indoor
unit
CR Total indoor unit capacity connection ratio
▪ Parameter B:
Parameter B
8+10 HP 12+14 HP
3.5kg 3.8kg
Metric piping. When using metric piping, replace the weight factors in the formula
by the ones from the following table:
Inch piping Metric piping
Piping Weight factor Piping Weight factor
Ø6.4mm 0.022 Ø6mm 0.018
Ø9.5mm 0.059 Ø10mm 0.065
Ø12.7mm 0.12 Ø12mm 0.097
Ø15.9mm 0.18 Ø15mm 0.16
Ø16mm 0.18
Ø19.1mm 0.26 Ø18mm 0.24
Ø22.2mm 0.37 Ø22mm 0.35
Connection ratio requirements. When selecting indoor units, the connection ratio
must comply with the following requirements. For more information, see the
technical engineering data.
Other combinations than those mentioned in the table are not allowed.
Indoor units Total CR
(a)
CR per type
(b)
VRVDX RADX LT Hydrobox AHU
VRVDX 70~130% 70~130% — — —
VRVDX +
RADX
80~130% 0~130% 0~130% — —
RADX 80~130% — 80~130% — —
VRVDX + LT
Hydrobox
70~130% 70~130% — 0~80% —
VRV DX +
AHU
70~110% 70~110% — — 0~110%
AHU 90~110% — — — 90~110%
(a)
Total CR = Total indoor unit capacity connection ratio
(b)
CR per type = Allowable capacity connection ratio per indoor unit type