temperzone R410A Split Systems Installation Guide
- June 6, 2024
- temperzone
Table of Contents
temperzone R410A Split Systems Installation Guide
R410A Models
1. Piping
- Use clean sealed refrigeration grade piping.
- Pipe to be cut ONLY with a pipe cutter.
- Use long radius bends (2 x pipe dia.)
- Insulate the suction (gas) line, seal all insulation joints and insulate the liquid lines on all units with EEV’s in outdoor unit.
- By-flow type filter dryers may be fitted in the liquid line .
- Include a process point on the interconnecting pipework.
- Ensure all open pipe ends are sealed until the final connection is made.
- Purge pipes using Nitrogen during brazing.
- Immediately before removing any brazed seals on pipe stub connections of outdoor units, release any residual pressure using Schraeder valves provided on the pipework after the shut-off valves. Warning: Failure to do so may cause injury.
2. Oil Traps
Oil traps must be fitted to vertical suction risers where outdoor unit is above indoor unit. Fit a trap at the bottom of the vertical rise and then at 8 m (maximum) intervals.
3. Piping Insulation
4. Sizing of Extra Suction Accumulation
Where extra suction accumulation is stipulated in Table 2 (p.9), it is because the total charge for the system pipe length exceeds the combined compressor shell and suction accumulator (if fitted) holding capacity.
There are alternative ways to provide extra accumulation;
i. If an accumulator is fitted, remove and replace it with an accumulator
onesize larger. If there is insufficient room inside the Outdoor Unit, locate
the replacement outside the unit.
ii. Add an accumulator (in series or parallel with any existing
accumulator)large enough to accomodate the additional charge at 60% full.
Example:
An additional accumulator is required for an ISD/OSA combination with an
intended line length of over 30 m, where the additional charge rate is 100g/m.
The extra accumulator is unlikely to fit inside the unit so it will need locating outside. An accumulator with connections the same size as the suction line will be added and this will usually have more volume than is required.
5. Evacuation Procedure
(Pre-Charged Outdoor Units)
Evacuate the Indoor Unit plus interconnecting pipework to achieve a vacuum of
500 microns which is to be held for 15 mins. The use of an electronic vacuum
gauge is essential for this exercise.
6. Pre-Charged Units
Pre-charged condensing units include the Base Charge for the unit set plus charge sufficient for the line length shown in the tables and stated in the unit’s installation instructions.
7. Refrigerant Charging
Refrigerant charge to be introduced as liquid only and by weight or volume
(not by system pressure or sight glass). Sight glasses are not recommended
because of flash gas in liquid line.
temperzone recommends accurate charging/adding of refrigerant using digital
refrigeration scales (spring balance is not acceptable).
For units supplied pre-charged, the actual line length and the final charge is crucial to correct operation. If you fear some charge has been lost, recover all the existing charge and re-charge accurately.
8. Superheat
On units without electronic expansion valves, superheat must be checked at the service valve on cooling cycle during commissioning. Ensure superheat is between 3°C to 5°C when the indoor air temperature is in the range 21°C to 27°C and the outdoor air temperature is in the range 24°C to 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.
For further information on measuring Superheat, visit our website.
9. Refrigerant Pipe Sizes
Suction/Liquid line sizes given in the following tables are interconnecting
pipe sizes and are not necessarily the same size as the pipe stub connections
exiting the Indoor or Outdoor unit.
On any unit with variable capacity compressors, do not oversize the
interconnecting piping as this will reduce the refrigerant velocities
significantly with the associated danger of not returning the oil to the
compressor.
10. Oil
Oil should be added on extended line lengths (refer tables overleaf).
For compressors with a sight glass fitted, add oil to maintain the level in
the sight glass after 15 minutes running time.
Rotary compressors and some inverter compressors designed for R410A use polyvinylether oil (PVE). While it is acceptable to top up (max. 5%) with mineral oil or polyolester oil (POE) it is best practice to use PVE oil.
Most scroll compressors designed for R410A use polyol ester oil (POE), typically Emcarate RL22CF, RL32CF or RL32-3MAF oil. Do not use mineral oil.
Please refer to the unit specification data sheet to ensure the use of the correct oil.
11. Crankcase Heaters
Crankcase heaters are fitted to all compressors. Disconnect the crankcase heater if the total line length is less than 8 m.
12. Pipe Length Capacity Loss
Maximum line lengths given represent actual measured line length between Indoor and Outdoor units. The equivalent line length is significantly more than actual line length because it includes an allowance for bends and vertical piping. Use the equivalent line length when calculating pressure losses or performance losses.
13. Commissioning
Each outdoor unit is supplied with a Commissioning Sheet to assist installers completing the Start Up Procedure outlined in the Installation & Maintenance pamphlet. The sheet includes a pulley adjustment guide for belt driven indoor units if applicable. We recommend you complete the form, send a copy to temperzone and keep the original yourself for possible future reference.
14. Manufacturer’s Note
The manufacturer reserves the right to make changes at any time without notice or obligation. Should any instruction in this guide conflict with any Installation & Maintenance pamphlet supplied with a unit, then the most recently dated publication should be considered correct.
Table 1 SPLIT SYSTEM PIPING REQUIREMENTS
Estimating Effective Line Length for Performance Loss
When calculating performance losses for long line lengths allowances must be made for bends in the pipework.
The tabled data (right) is based on Long Radius 90° bends (2 x pipe dia.).
Add this allowance for every bend to the total line length to calculate an ‘effective’ line length for performance loss.
No allowance has been included for any effect from vertical lift.
Standard Unit Limitations allow the unit to be installed without any extra protection other than adjustment of the refrigeration gas and/or oil charge.
- For ISDL/OSA 116 combinations deduct 0.7kg when 10m or less.
** For ISU/OSA 141 combinations deduct: 0.5kg when 10m or less; or 0.75kg when 5m or less.
*** For ISDL/OSA 87 combinations deduct 0.5kg when 10m or less.
Table 2 SPLIT SYSTEM PIPING REQUIREMENTS
AUCKLAND
temperzone Ltd
38 Tidal Road,
Mangere South, Manukau 2022.
Private Bag 93303,
Otahuhu, Manukau 1640.
Phone 0-9-279 5250
Fax 0-9-275 5637
Email sales@temperzone.co.nz
WELLINGTON
Phone 0-4-569 3262
Email wgtn@temperzone.com
CHRISTCHURCH
Phone 0-3-379 3216
Email chch@temperzone.com
SINGAPORE
temperzone Ltd
1 Claymore Drive #08-13
Rear Block, Orchard Towers
Singapore 229594
Phone SNG 6733 – 4292
Fax SNG 6235 – 7180
Email sales@temperzone.com.sg
SYDNEY
temperzone australia pty ltd
14 Carnagie Pl, Blacktown, NSW 2148
PO Box 8064, Seven Hills West NSW 2147
Phone (02) 8822 – 5700
Fax (02) 8822 – 5711
Email sales@temperzone.com.au
MELBOURNE
Phone (03) 8769 – 7600
Email vicsales@temperzone.com.au
ADELAIDE
Phone (08) 8115 – 2111
Email sasales@temperzone.com.au
PERTH
Phone (08) 6399 – 5900
Email reception@airskill.com.au
BRISBANE
Phone (07) 3308 – 8333
Email qldsales@temperzone.com.au
NEWCASTLE
Phone (02) 4962 – 1155
Email salesmcintoshair.com.au
LAUNCESTON
Phone (03) 6331 – 4209
Email info@hvac-supplies.net
Visit our website www.temperzone.com
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