temperzone R410A Reverse Cycle Split System Outdoor Unit Installation Guide

: August 26, 2024
: temperzone

Table of Contents

temperzone R410A Reverse Cycle Split System Outdoor Unit
Frequently Asked Questions
INSTALLATION
Dimensions (mm)
REFRIGERATION PIPING
SYSTEM CHECK TESTS
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

temperzone R410A Reverse Cycle Split System Outdoor Unit

Specifications

Model: OSA 380RKTBQV (c/w UC6 Controller)
Type: Reverse Cycle R410A Split System Outdoor Unit
Net Weight: 458 kg
Refrigerant: HFC-410A (R410A)
Suction Pipe Size: 22 mm OD (x2)
Liquid Pipe Size: 13 mm OD (x2)
Max Line Length: 60 m
Height Separation Limits: Outdoor Unit above Indoor Unit: 20 m; Outdoor Unit below Indoor Unit: 20 m

Frequently Asked Questions

Q: Can I use a refrigerant other than HFC-410A (R410A) with this unit?

A: No, using other refrigerants is not authorized and may cause operational issues, loss of efficiency, and safety hazards.

Q: What should I do if I need to install the outdoor unit above the indoor unit?

A: Ensure proper trap placement in the suction riser at intervals to facilitate oil return to the compressor.

GENERAL
The OSA 380RKTBQV outdoor unit is a twin system that provides the facility for capacity control (staging) or staggered starting.
This OSA 380RKTBQV Outdoor Unit must be installed in accordance with all national and local safety codes.

Combinations
OSA 380RKTBQV with ISD 380KBY
OSA 380RKTBQV with ISD 380KB-P

Options

TZT-100 Room Temperature Controller
UC6 Service Interface tool.

INSTALLATION

Positioning
Refer to dimension diagram below for minimum clearances. Fasten the unit down to a firm flat horizontal base using the 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. These springs are not supplied with the unit.
Plant Room Installation (Option) Ensure sufficient ventilation is installed. Discharge air from above the unit must be ducted away to prevent recirculation of air through the unit. Restricted airflow and/or recirculation reduces efficiency. Refer to Temperzone Support for potential adjust-ment of outdoor fan speeds. Never install the unit in a totally enclosed room.

Drain
Four drain holes are provided in the base of the unit to release condensate and/or rain water.

Dimensions (mm)

REFRIGERATION PIPING

General
The OSA 380 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 380 units have brazed pipe connections.

Recommended Pipe Sizes
Suction pipe (x2): 22 mm OD
Liquid pipe (x2): 13 mm OD

Line Lengths
The standard unit is suitable for a line length up to 60 m maximum; no extensions. Refer also to Oil Charge overleaf.

Height Separation Limits
Outdoor Unit above Indoor Unit : 20 m Outdoor Unit below Indoor Unit : 20 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 8 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

Use clean sealed refrigeration grade piping and accessories designed specifically for R410A.
Cut pipe with a pipe cutter ONLY.
Use long radius bends (2x pipe dia.).
Insulate the suction (gas) line and seal all insulation joints.
Bi-flow type filter dryer may be fitted in the liquid line.
Include a process point on the interconnecting pipework.
Ensure open pipe ends are sealed until the final connection is made.
Purge pipes using Nitrogen during brazing.
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.

Important
Do not connect System 1 to System 2.

Charging
The unit is supplied with sufficient refrigerant HFC-410A (R410A) for 10 m of pipework between the indoor and outdoor units; refer Specification Sheet for amount. Add 100 g per metre above 10 m.

Procedure (per system)

Evacuate Indoor Unit and interconnecting pipework to a pressure of 500 microns and hold for 15 mins.
Add refrigerant via the Schraeder connection on the smaller of the Outdoor Unit’s two service valve extension pipes.
Open the service valve at the Outdoor Unit to allow refrigerant to flow throughout the system.
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 (on a reverse cycle unit) or other heat source to raise the indoor air temperature to about 24°C 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 (R410A). 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 40 m, Emkarate RL22CF polyolester oil (or similar) should be added to the refrigerant at the rate of 20 ml/m of suction piping.
Note: This oil absorbs moisture quickly if exposed to open air. Do not use mineral oil.

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, and a mains isolator provided – preferably close to the Outdoor Unit.

The OSA 380 is provided with a 24V AC control circuit for a thermostat, on/off switch and/or time clock.
The control transformer 240V primary voltage is used for countries with 230-240V power supply. For countries with supply voltages 200-220V, change the primary voltage on the transformer to 208V.
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.
Refer to temperzone for recommended thermostats.
If ‘Indoor Fan Off During De-Ice’ is a requirement, re-configure the unit’s controller using the optional UC6 Service Interface.
A 24 hour power supply to the ‘control’ phase is required to power the crankcase heaters, otherwise warranty is void.

SYSTEM CHECK TESTS

Check that the shipping block beneath the compressor has been removed and that the compressor is secure on its mounts.
Check by hand that all fan motors can turn freely.
Check that the air filters have been correctly installed, if fitted.
Check air diffuser dampers are open if appropriate.
Check that the thermostat, or external 24V controller, is correctly wired to the unit and is set at the desired temperature.
Check the tightness of all electrical connections and sign the check label.
Leave the thermostat, or external 24V controller, 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.)
Check the supply voltage between each phase and neutral.
ISD 380KB-P version only:
Turn on the thermostat, or external 24V controller. Set it to ‘FAN only’ operation and select HIGH speed. When the fan has reached full speed adjust the ‘POT’ (see wiring diagram) to deliver the design air flow. Do not set the fan speed unnecessarily high.
Select Medium, then Low fan speed. Check that the Indoor fan slows down as the selected speed is reduced. Turn fan off.
Check the supply air flow at each outlet.
Touch up any outdoor unit paintwork damage to prevent corrosion.

SETTING SUPPLY AIR FLOW
Consult ISD/OSA 380 Technical Data pamphlet at www.temperzone.biz for details of airflow/duct static pressure, if required.
If the indoor air returning to the unit is regularly expected to be above 50%RH, then the coil face velocity should be limited to be 2.5 m/s or less (refer Air Handling graph in Technical Data pamphlet) to avoid water carry- over problems.

UNIT CONTROLLER (UC6)
The Unit Controller provides system protection functions such as coil frost protection, de-icing, high head pressure and low suction pressure cut-out. It also protects against rapid cycling of the compressor(s) and loss of refrigerant. Various methods of head pressure control (or limiting) are employed by the Unit Controller. In combination, these features deliver optimised performance across a wide operating temperature range. Refer to UC6 Controller label on the unit for operation & fault diagnostics information. Many operating status conditions can be determined, without gauges, simply by using a UC6 Service Interface graphical display available from temperzone.

MAINTENANCE
Weekly For First Four Weeks

Check indoor unit air filters (if fitted) and vacuum or wash clean as necessary.
Check condensate drain for free drainage.
Check compressor compartment for oil stains indicating refrigerant leaks.

Six Monthly

Check the tightness of electrical connections.
Check the tightness of fans and motor mountings.
Check suction and discharge operating pressures. (Using a UC6 Service Interface avoids fitting and removing gauges with consequential refrigerant loss.)
Replace indoor unit air filters (if fitted).
Check condensate drain for free drainage.

Yearly

Check all refrigerant piping for chafing and vibration.
Check air supply at all diffusers.
Check for excessive noise and vibration and correct as necessary.
Check for insulation and duct damage and repair as necessary.
Check and remove as necessary any lint and dust accumulation from outdoor coil fins. In corrosive environments, the checking and cleaning frequency should be increased.
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.

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.