TemperZone OSA 83RKSH, OSA 95RKSH, OSA 135RKSGH, OSA 135RKGH, OSA 135RKTGH Installation & Maintenance

OSA 83RKSH & OSA 95RKSH

Reverse Cycle R410A Single Phase
Split System Outdoor Units

Installation &
Maintenance

GENERAL

This OSA 83 and 95 Outdoor Units must be
installed in accordance with all national and
local safety codes.

Options

1. Vertical discharge grille.

2. Wall mounting brackets.

3. Anti-vibration mounts (rubber).

4. Soft starter kit

5. Drain connection adaptors - right angle.

INSTALLATION

Positioning

Refer to dimension diagram below for
minimum clearances. Position the unit so
that prevailing winds do not blow onto the
exhaust to slow the fan, and one unit does
not exhaust toward the inlet of another unit.
The optional vertical discharge grille can be
used to deflect prevailing winds and reduce
clearances.

Mount either free standing or on a wall using
the optional mounting brackets available.

REFRIGERATION PIPING

General

The OSA 83/95 is shipped with a refrigerant
charge sufficient for a 10 m line length.
The matched indoor unit is shipped with a
holding charge of nitrogen. OSA 83/95 units
have shut-off service valves and swaged
assemblies. Two loose pipe extensions are
supplied to enable a choice of exit – side or
rear; both require brazing.

Recommended Pipe Sizes

Suction pipe : 16 or 19 mm OD
Liquid pipe : 10 mm OD

Line Lengths

The standard unit allows for a line length
up to 30 m. For line lengths between 30 m
and 40 m, refer to temperzone's

Split Systems Installation Guide (refer
www.temperzone.biz/Technical Support).

Refer also to Oil Charge overleaf.

Maximum line length when extended is 40m.
For line lengths in excess of 15 m use a
19 mm OD suction pipe size.

Height Separation Limits

Outdoor Unit above Indoor Unit : 16 m
Outdoor Unit below Indoor Unit : 16 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 and accessories designed
specifically for R410A.

2. Cut pipe with a pipe cutter ONLY.

3. Use long radius bends (2x pipe dia.).

4. Insulate the suction (gas) line and seal
all insulation joints.

5. Bi-flow type filter dryer may be fitted in
the liquid line.

6. Include a process point in 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.

Free Standing :

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 or rubber mounts (optional
extra) beneath the unit. These items are not
supplied with the unit.

Wall Mounting Option:

Complete wall mounting instructions are
supplied with the optional wall mounting kit.

Drain

Four drain holes are provided in the base.
Three plastic bungs are supplied (loose)
should you want to direct the condensate
and/or rain water to one of the holes
provided. Drain connection adaptors (25/13)
are available as an optional extra.

Dimensions (mm)

OSA 83/95 RKSH

PROJECTION

Not to Scale

Net Weight 85 kg

686 MTG CTR

12 DIA. HOLE+SLOT

ACCESS

PANEL

349

MTG CTR

395

OVERALL

REFRIG.
CONN’S

25 DIA.

ELECTRICAL

CONDUIT

HOLES

660

OVERALL

1040

OVERALL

72

100 MIN. CLEARANCE

100 MIN. CLEARANCE

2000 MIN. CLEARANCE *

750 MIN. CLEARANCE

180

25 DIA.

DRAIN

HOLES

174

25

25 DIA.
DRAIN
HOLES

* 600 min with optional Vertical Discharge Grille

Refer to temperzone for recommended
thermostats.

It is recommended electricians run a spare
wire between Outdoor Unit and Indoor
Unit in case 'Indoor Fan Off During De­Ice' becomes a requirement. Leave this
spare wire unconnected until required.
(Not required when using temperzone
SAT Controller). Refer indoor unit's wiring
diagram.

A 24 hour power supply is required to the
unit. Disconnect the crankcase heater if the
total line length is less than 8 m.

SYSTEM CHECK TESTS

1. Leave the remote switch in the off
position and close the mains isolating
switch.

A four hour delay period is required to

allow the crankcase heater to drive any
liquid refrigerant out of the compressor
oil. Bypass the crankcase heater
thermostat (CCHT) for this period only.

2. Check that all fan motors are free
running.

3. Check tightness of electrical
connections.

4. Check that the thermostat is correctly
wired to the unit and is set at the desired
temperature.

5. Check that the air filters, if any, have
been correctly installed.

6. Check any supply air diffuser dampers
are open.

START UP PROCEDURE

Use the supplied Commissioning Sheet to
help you complete the following procedure:

1. Switch on the unit after the four hour
delay period has expired. Ensure the
crankcase heater thermostat has been
reconnected.

2. Check the supply voltage.

3. Measure the current draw on the
compressor motor and on each fan
motor. Check all readings against the
specified values - particularly the indoor
fan amps if the unit is installed in a free
blow application.

4. Fit gauges and measure the suction and
discharge pressures.
Important: Gauges must be designed
specifically for use with R410A.

5. Test the operation of the high pressure
safety control by switching off the
outdoor unit's fan.

6. Test the operation of the reversing valve
by running the unit in both the heating
and cooling mode.

7. Check that the air flow over the outdoor
unit's coil is adequate and that the fan is
running smoothly.

8. Check the superheat - refer charging
procedure.

9. Check the supply air flow at each outlet.

10. Check condensate drains for free
drainage and no leaks.

Pipe Length Capacity Loss

On Cooling Cycle Due to Pressure Drop
Note : Loss percentages are approximations only, due to piping variations. No allowance made for vertical piping.

Charging

The unit is supplied with refrigerant
HFC-410A (R410A) which is sufficient for
up to 10 m of pipework between the indoor
and outdoor units; refer wiring diagram
specification table for amount. Add 45 g of
HFC-410A per metre over 10 m.

Procedure:

1. Evacuate Indoor Unit and
interconnecting pipework to a pressure
of 500 microns and hold for 15 mins.

2. Add refrigerant, if needed, 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.

4. Leak check all brazed and fitted joints.

IMPORTANT :
Step 8 of the 'Start Up Procedure' requires
you to check that the superheat on the
suction line (where it enters the Outdoor
Unit) is between 3°C - 5°C on cooling cycle
with an indoor air temperature in the range
21° - 27°C and outdoor air temperature in
the range 24° - 35°C. If the conditions of the
day do not allow this, use the heating cycle
or other heat source to raise the indoor
air temperature to about 24°C. Return to
cooling cycle and blank off the outdoor
coil to raise the head pressure to 400 psig
(2760 kPag). Alter charge up or down to
establish correct superheat.

WARNING:

This unit is designed for use ONLY with
the refrigerant HFC -410A. The use of
other refrigerants is NOT authorised or
approved by the manufacturer and may
cause operational problems such as poor
performance and efficiency, loss of capacity,
degradation of materials and refrigerant
leaks. The use of flammable or explosive

materials as a refrigerant creates the
additional risks of fire and explosion
which may result in property damage,
personal injury or death.

Oil Charge

For line lengths in excess of 30 m, Idemitsu
polyolvinylether oil (PVE) should be added
to the refrigerant at the rate of 10 ml/m of
suction piping. Note: As an alternative,
mineral oil or polyol ester oil (POE) may be
added, but no more than 65 ml.

ELECTRICAL REQUIREMENTS

Electrical work must be done by a qualified
electrician. The outdoor unit must be wired
directly from a distribution board by means
of a circuit breaker or H.R.C. fuse, and a
mains isolator provided - preferably close to
the Outdoor Unit.
Note: DO NOT USE REWIRABLE FUSES.

Standard units are suitable for use with
thermostats with either manual Heat/Cool
selection or automatic changeover subject
to the contact ratings of the thermostats.

11. Check compressor compartment for oil
stains indicating refrigerant leaks.

12. Touch up all outdoor unit paintwork
damage to prevent corrosion.

OUTDOOR UNIT CONTROLLER (OUC)

The Outdoor Unit Controller (OUC)
includes a temperature sensing head
pressure control which enables the system
to compensate for outdoor ambient
temperatures below 20°C, and heating cycle
above 15°C. The OUC also has features
which protect against icing or overheating
of coils, rapid cycling of the compressor and
loss of refrigerant charge.

If the outdoor unit fans take some time
to begin rotating when the system is
powered on, or they don't appear to be
rotating appropriately while the compressor
is running, consult the OUC label on
the electrical box. If necessary, refer
to temperzone for further diagnostic
information.

MAINTENANCE

Weekly For First Four Weeks

Check indoor unit air filters (if fitted) and
vacuum or wash clean as necessary.

Six Monthly

1. Check the tightness of all fan and motor
mountings.

2. Check the tightness of electrical
connections

3. Check that fan motors are free running.

4. Check suction and discharge operating
pressures.

5. Replace indoor unit air filters (if fitted).

6. Check condensate drains for free
drainage.

Yearly

1. Check all refrigerant piping for chafing
and vibration.

2. Check the operation of electric heaters if
fitted.

3. Check air supply at all diffusers.

4. Check for excessive noise and vibration
and correct as necessary.

5. Check for insulation and duct damage
and repair as necessary.

6. Remove lint and dust accumulation from
outdoor coil fins.

7. Touch up all outdoor unit paintwork
damage to prevent corrosion.

NOTE

The manufacturer reserves the right to
change specifications at any time without
notice or obligation. Certified dimensions
available on request.

This pamphlet replaces the previous
issue no. 3552b dated 03/11.
OSA 83/95 wiring revision D and J resp.

Pipe Size (mm)

Equivalent Line Pipe Length (m)

Liquid

10

10

Suction

16

19

5

2 %

1 %

20

8 %

3.5 %

10

4 %

1.5 %

15

6 %

2.5 %

30

12 %

5 %

Additional Pipe Length to allow per Bend

16 mm

0.3 m

19 mm

0.4 m

Suction Pipe Size OD

Long 90° Radius

(2 x pipe dia.)

© temperzone limited 201210/12 Pamphlet No. 3891