Installation manual
10
For twin, triple, and double twin system
Please charge additionally according to the following calculation.
(additional amount is R1+R2)
1.
G1: total length of
Ø
9.5 mm liquid piping
G2: total length of
Ø
6.4 mm liquid piping
2.a
G1>30 m
calculate length over 30 m (=G1–30 m)
Based on this length decide R1, R2 in the table
b
G1
≤
30 m and G1+G2>30 m
calculate total length over
30
m (=G1+G2–30 m)
Based on this decide R2 in the table, R1=0
3.
Total additional charge amount
R=R1+R2 (kg)
Table 2:
Length <unit: m>, additional charging of refrigerant
<unit: kg>
Example 1
1
G1=L1=35 m
G2=L2+L3=7+5=12
2
Over
30
m
a
G1
–
30=5 m
➙
Ø9.5 R1=0.5 kg
b
G2=12 m
➙
Ø6.4 R2=0.6 kg
3
Refrigerant charge amount=R=R1+R2=0.5+0.6=1.1 kg
Example 2
1
G1=L1=5 m
G2=L2+L3+L4=7+17+20=44
2
Over
30
m
a
G1=5 m
➙
R1=0.0 kg
b
(G1+G2)
–
30=(5+44)
–
30=19
➙
Ø6.4 R2=0.6 kg
3
Refrigerant charge amount=R=R1+R2=0.0+0.6=0.6 kg
Total charging weight of the refrigerant (after a leak,
etc.)
The total charging amounts relate to the refrigerant piping length as
in
"Maximum allowable piping length"
of the table in paragraph
"Allowable pipe length and height difference" on page 6
. (E.g. twin:
L1+L2).
Table 3:
Total charging amount <unit: kg>
Precaution for pumping-down operation
The outdoor unit is equipped with a low pressure switch or a low
pressure sensor to protect the compressor.
Take the following steps to perform the pumping-down operation.
■
Preliminary measures
•
Make sure to cut off power supply.
Open the front panel and cover the PCB and terminal board
with insulation sheet to avoid electric shock by accidental
touching of live parts.
•
Close the front panel before leaving the outdoor unit. You
cannot leave the unit unattended in case the front panel
remains opened.
•
Turn on the power supply and carry out pumping-down
operation according to the following procedure.
■
Pump down operation
(a)
If after finishing pumping-down operation the outdoor unit does not operate, not
even when the remote controller switch is turned on, the remote controller may or
may not indicate
"
U4
"
. But this is not a malfunction.
•
After finishing the pumping-down operation, make sure to
have removed the insulation sheet that was placed in the
switch box as a protective measure like in chapter
"Preliminary measures" on page 10
.
•
When in need of operation, turn off the main power supply
and turn it on again. Make sure that stop valves both on
liquid and gas side are open and be sure to operate the
unit in cooling operation during test run.
Liquid piping
Ø
Length exceeding "Chargeless length"
0~10
10~20
Main
9.5
0.5
1.0
R1
Branch
Branch
6.4
0.3
0.6
R2
L2=7 (Ø6.4)
50 type
100 type
L1=35 (Ø9.5)
indoor
L3=5 (Ø6.4)
50 type
outdoor heat pump
L2=7 (Ø6.4)
50 type
indoor
125 type
L1=5 (Ø9.5)
L3=17 (Ø6.4)
50 type
outdoor heat pump
indoor
L4=20 (Ø6.4)
50 type
In case of complete recharge of the refrigerant, please first
execute vacuuming. Execute this vacuuming from the
service port. Do not use the port of the stop valve for
vacuuming. Vacuuming can not be executed completely
using such port.
Position of service port:
Outdoor units have 1 service port, located between
the heat exchanger and the 4-way valve.
Refrigerant piping length
Model
Liquid pipe
size
5~10 m
10~20 m
20~30 m
30~40 m
40~50 m
RZQSG71
standard
1.75
2.25
2.75
—
RZQS71
standard
1.75
2.25
2.75
—
RZQS100~140
standard
2.70
3.20
3.70
4.20
4.70
Never short-circuit the low pressure switch or low pressure
sensor during pump-down operation.
Procedure
Precaution
1
Make sure that stop valves both
on liquid and on gas side are
open.
—
2
Push the BS4 pumping-down
operation button on the PC
board of the outdoor unit
(±8 seconds).
Compressor and outdoor fan will
start operation automatically.
The indoor unit fan may
automatically start running.
Please pay attention to this.
3
Close the stop valve on the
liquid side securely about 2
minutes after the compressor
started operation. (See
"How to
use the stop valve" on page 7
)
Never leave the outdoor unit
unattended with opened front
panel when power supply is on.
In case the stop valve on the
liquid side is not securely closed
during compressor operation,
pumping-down operation cannot
be executed.
4
Once compressor operation
stops after 2 to 5 minutes
(a)
,
close the stop valve on the gas
side securely. (See
"How to use
the stop valve" on page 7
)
5
Turn off the power supply.
Summary of Contents for RZQSG71L3V1B
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