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Old 10-01-2017, 10:43 AM   #9228
Join Date: Nov 2016
Posts: 212
Hi Dachee,

Thank you for the advice. Will highlight this when they come for installation.

Other points to look out are:

1.Check for system leak:
1.1 Ensure that they vacuum the system for each FCU for 15 mins,

1.2 Then hold the vacuum for 1 to 2 mins to check for leak (the pointer in the manifold gauge should not drop) when the vacuum pump is turned off. if the pointer shifted from original position, it is a sign that there is leaking in the piping somewhere. The source of the leak must be identified and rectified and above steps and 1 and 2 repeated. You may wish to take a photo when the pump is just turned off for comparison.

1.3 When there is no sign of leaking, the gas in the condenser will be released into the system (piping) and the service valve caps tighten. Provide the workers with some soap solution to be place over the service valves to check for leaking.

Do this for each FCU.

2. Check that one continuous new pipe is used for your system unless it is more than 15m. Check this before the workers insert the pipes into the insulation.

3. Check that all bends are either done by pipe bender or pipe bending spring. If you suspect that this is not done, cut the across the insulation at one end of the bend and pull it back to expose the copper pipe at the bend to check whether the pipe is kinked or not. Kinked pipe is not acceptable. It is good to inform the seller that kinked pipe is not acceptable when they start work and that in the even of a kinked pipe, the whole length of pipe need to be change. The cut insulation can then be either glue back with special glue like Superlon Insultaion Adhesive ( you can do an internet search, about $6/1L tin) and tape over with duct tape, this is a preferred method or duct tape the insulation back. Duct tape is used by the contractor but not all contractors carry the insulation adhesive.

4. If you are buying the insulation adhesive, it is good to ask the contractor to glue all the insulation tubing ends to ends instead of just duct tape them together which the contractor normally do.

5. When the FCU is installed, it is normally installed at a slight tilt (slant) to allow for water drainage. But this tilt must not be obvious to the eyes. If the slant is too much, the worker need to rectify this.

6. Another area to check is when all are done, check that the cooling fin in each FCU are not damaged.

7. Ensure that the condenser is mounted to the floor.

8. When all is done, run the system/s with all FCUs and look out for abnomal sound or blinking at the FCUs. There is no harm asking the contractors any questions that you have.

9. Check that all outdoor wall opening are sealed.

The above are my opinion and hope that they are helpful.

Last edited by dachee; 10-01-2017 at 10:46 AM..
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