Hitachi UTOPIA RAS-4HVRP2E Installations- Und Betriebshandbuch Seite 43

Drain piping
8.6 REFRIGERANT CHARGING QUANTITY
Outdoor Units has been charged with refrigerant for 20m of
actual piping length (L). An additional refrigerant charge is
required in systems with actual piping length longer than 20m.
1 Determine an additional refrigerant quantity according to the
following procedure, and charge it into the system.
2 Record the additional refrigerant quantity to facilitate service
activities thereafter.
Refrigerant
charge before
Outdoor unit
shipment
(W (kg))
0
RAS-4HVR(C/P)2E
RAS-5HVR(C/P)2E
RAS-6HVR(C/P)2E
3.0
RAS-4HR(C/P)2E
RAS-5HR(C/P)2E
RAS-6HR(C/P)2E
RAS-4HVN(C/P)2E
RAS-5HVN(C/P)2E
RAS-6HVN(C/P)2E
3.2
RAS-4HN(C/P)2E
RAS-5HN(C/P)2E
RAS-6HN(C/P)2E
9 DRAIN PIPING
9.1 DRAIN DISCHARGING BOSS
When the base of the outdoor unit is temporarily utilized as a
drain receiver and the drain water in it is discharged, this drain
boss is utilized to connect the drain piping.
Model
DBS-26
Drain hole (connexion for DBS-26)
Drain hole (*)
(*) To cover these drain holes, sealing pads are included
in DBS-26 kit.
12 PMML0545 rev.2 - 04/2021
Additional Maximum
refrigerant additional
charge charge
(g/m)(P) (kg)
45 2.9
60 3.9
Applicable Model
All units
!
C A U T I O N
• When charging refrigerant, measure the amount precisely.
• Overloading or underloading of refrigerant may cause compressor
problems.
• If the actual piping length is less than 5 m consult your dealer.
• If ambient temperature >43ºC, minimum actual piping length is 15 m.
• Charge refrigerant correctly. Overcharging or insufficient charging
could cause a compressor failure.
Additional refrigerant charge calculation method
Use the following formula: W
Setting of Pipe Length DSW
DSW2 setting will be required only when the refrigerant pipe
length is shorter than 5 m or longer than 30 m. Pipe length
setting shall be performed as shown below.
(The  side in the table below shows the DSW location)
DSW2 on outdoor PCB1
Factory setting Pipe length ≤ 5m
Connecting procedure for DBS-26
1 Insert the rubber cap into the drain
boss up to the extruded portions.
2 Insert the boss into the unit base
and turn approximately 40 degree
counterclockwise.
3 Drain boss is 32 mm (O.D.).
4 A drain pipe should be field-supplied.
?
N O T E
• Do not use this drain boss set in a cold area, because the drain
water may freeze. This drain boss is not sufficient to collect all the
drain water. If collecting drain water is completely required, provide
a drain-pan that is bigger than the unit base and install it under the
unit with drainage.
= (L-20) x P
1
Pipe length ≥ 30m
Drain hole
(DBS-26)
Drain pipe
Extruted
portions
Drain boss
Rubber
cap