OSA 300
Split System
Outdoor Unit
Installation &
Maintenance
Recommended Pipe Sizes
Suction pipe :
28 mm OD
Liquid pipe :
16 mm OD
Line Lengths
For line lengths in excess of 50 m, contact
the manufacturer's nearest sales office for
additional piping requirements. Refer also to
Oil Charge
overleaf.
Maximum extended line length is 70 m.
Height Separation Limits
Outdoor Unit above Indoor Unit : 18 m
Outdoor Unit below Indoor Unit : 12 m
Vertical Risers
If the outdoor unit is to be installed above
the indoor unit, then the suction riser should
be trapped at the bottom of the vertical rise
and then again at 5 m (maximum) intervals.
This is to ensure oil return to the compressor.
The trap to be a 'swan neck' curve in the
pipe, with no change in the pipe size.
Piping
1.
Use clean sealed refrigeration grade
piping.
2.
Cut pipe with a pipe cutter ONLY.
3.
Use long radius bends (2 x pipe dia.).
4.
Insulate the suction (gas) line and seal
all insulation joints.
5.
Filter dryer may be fitted in the liquid
line (bi-flow type on reverse cycle
systems).
6.
Include a process point on the
interconnecting pipework.
7.
Ensure open pipe ends are sealed until
the final connection is made.
8.
Immediately before removing brazed
pipe connection's seal, reduce holding
charge between connection points and
service valves to atmospheric pressure.
Warning
: Failure to do so may cause
injury.
Charging
The unit is supplied with a 1 kg holding
charge of refrigerant HCFC-22 (R22). Add
7.0 kg of HCFC-22 to complete the base
charge, then add 105 g per metre of
pipework between indoor and outdoor units.
Procedure:
1.
Evacuate Indoor Unit and
interconnecting pipework to a pressure
of 500 microns and hold for 15 mins.
2.
Add refrigerant via the Schraeder
connection on the smaller of the
Outdoor Unit's two service valves.
3.
Open the service valve at the Outdoor
Unit to allow refrigerant to flow
throughout the system.
Drains
Four drain holes are provided in the base of
the unit to release condensate and/or rain
water. If a totally drip free installation is
required then mount the unit in a separate
drain tray.
Coil Protection
A coil protection guard is available as an
optional extra.
REFRIGERATION PIPING
General
The OSA 300 is shipped with a holding
charge of refrigerant. The matched indoor
unit is shipped with a holding charge of
nitrogen. OSA 300 units have one flare and
one brazed pipe connection.
GENERAL
OSA
300
-
A general designation for outdoor unit
OSA
300C
-
Outdoor unit, cooling only version
OSA
300R
-
Outdoor unit, reverse cycle version
This OSA 300 Outdoor Unit must be
installed in accordance with all national and
local safety codes.
INSTALLATION
Positioning
Refer to dimension diagram below for
minimum clearances. Fasten the unit down
to a firm flat horizontal base using the four
holes provided in the mounting rails.
When the unit is being installed on a roof it
is recommended that the unit is installed on
a substantial structure with vibration
isolating springs beneath the unit. These
springs are not supplied with the unit.
Dimensions (mm)
OSA 300
PROJECTION
Not to Scale
SERVICE
ACCESS
PANEL
685
MTG CTR
20 DIA.
ELECTRICAL
CONDUIT
HOLES
1140
OVERALL
1400 OA
1084 MTG CTR
13 DIA. HOLES
205
20 DIA.
DRAIN
HOLE
750
500 MIN.
CLEARANCE
500 MIN. CLEARANCE
2000 MIN. CLEARANCE
REFRIG.
CONN'S
ELECTRICAL
ACCESS
PANEL
1000 MIN. CLEARANCE
500 MIN.
CLEARANCE
20 DIA.
DRAIN
HOLE
20 DIA.
DRAIN
HOLE
W
Z
X
Y
18
Net Weight
OSA 300C 220 kg
OSA 300R 226 kg
CORNER LOADS (kg)
W
X
Y
Z
50
70
63
43
Summary of Contents for OSA 300
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