Outdoor unit
6.Purging Method:
1.Remove the four screws of fresh air box from the back cover.
2.Use six screws to fix fresh air box onto the designated position on the outdoor unit.
3.Remove two screws of the pipe junction of the fresh air box, then insert the flared departure of
the change for fresh air tube into the pipe junction and then fix with the screws.
4.Use four screws to fix the fresh air box onto the back cover, as illustrated:
Fresh air box
Fresh air
box
Fresh air tube
Fresh air tube
Fresh air tube
Screw
hole
Dust
filtration
mesh
Screw
Screw
Joint of tube
Flared departure
5.Installation instruction on the outdoor part of the fresh air device
Back
cover
Note:After wiring, the connecting terminals of outdoor unit and change-fresh-air as well as the wiring sheath should be
placed in the change-for-fresh-air box against the rain.
Connecting terminal
Fresh air signal
wire
(with guard ring)
Change-for-fresh-air box
7
3-way valve
2-way valve
6.35mm(1/4")
12.7mm(1/2")
2-way valve
6.35mm(1/4")
3-way valve
9.52mm(3/8")
HSU-09C03/VA(ZXF)
HSU-09H03/VA(ZXF)
HSU-12C03/VA(ZXF)
HSU-12H03/VA(ZXF)
HSU-18C03/V(ZXF)
HSU-18H03/V(ZXF)
2-way valve
9.52mm(3/8")
3-way valve
15.88mm(5/8")
HSU-22C03/V(ZXF)
HSU-22H03/V(ZXF)
HSU-22C03/V(ZF)
HSU-22H03/V(ZF)
HSU-12H03/VB(ZXF)
HSU-12H03/V(ZXF)
HSU-24C03/V(ZXF)
12.7mm(1/2")
HSU-24C03/V(ZF)
HSU-24H03/V(ZXF)
HSU-24H03/V(ZF)
HSU-24HK0307
Note: When extending piping, air inside piping shall be removed by using external refrigerant gas,
charge according to the following list.
Brand new outdoor unit is charged 50g or 80g(22k,24k) more refrigerant than regulated weight. Only for
first installation, this extra 50g or 80g(22k,24k) can be used to purge airin pipes.
During this procedure, 50g or 80g(22k,24k) refrigerant will be discharged in piping.(This must be
strictly controlled within 90
o
and 10 sec.)
When connecting pipe exceeds 5 meters, 20g or 60g
(only for 22k
24k) refrigerant shall be added per exceeding
meter. Charge according to the following list.
Piping length
Additional amount
5m
7m
No need 40g
10m
100g
for 9k 12k 18k
Push the air out of the indoor unit
and piping as followes:
(1) Remove the valve cap on 2-way valve in outdoor unit.
(2) Loosen by 1/2 turn the flare nut of gas pipe, which is
is conneted to 3-way valve.
(3) Loosen 2-way valve by 90
o
using hexagon wrench,
and after approx.10 sec tighten it up. Gas comes out
through flare nut on wide pipe. If no gas is discharged,
tighten flare nut with specified torque.
(4) Open 2-way and 3-way valves using specified torque.
(5) Tighten the caps on the valves with specified torque.
Valve rod
Valve cap
7-9
20-25
Tighten torque N.m
for 22k 24k
Max. Length: for 9K : A=7m
for 12K: A=10m
for 18K 22K 24K: A=20m
Max.Elevation:
for 9K 12K: B=5m
for 18K 22K 24K: B=10m
5m
7m
No need 120g
10m
300g
20m
900g
C
Outdoor unit
Indoor unit
Outdoor unit
Indoor unit
Oil trap
A
B
Outdoor unit
Indoor unit
A
B
A
B
CAUTION
In case more than 5 metres
ˈ
oil trap
should be installed every 5~7m.
C
HSU-24HD0307
