The commissioning work consists of:
1) Checking all control cycles.
2) Checking refrigerant charge.
3) Checking all power supplies, connections, fuel trains and vents.
4) Measuring and adjusting air flow at the unit and at the rooms (balancing
work).
5) Educating the homeowner about the system and equipment (provide all instructions
and manufacturer’s documents).
The best way to get an overview of these issues is to contact the Air Conditioning
Contractors of America (ACCA) and purchase Manual RS. It’s
available in their online store: Click
Here
This manual explains the issues in ways a consumer should be able to understand.
There also may be local codes and utility regulations that must be observed.
Make certain contractors you hire have all of the appropriate licenses
for installing HVACR equipment in your state and local area.
Be aware that some contractors, as a matter of policy, do the things listed
above and some do not do these things. It takes more time and effort to do
the job correctly. Ask them if they do these things. Expect to pay more for
comprehensive service.
With regard to placement of the unit, one must consider operating cost as
well as installation cost. The hot environment near the roof makes the cooling
unit less efficient. However, if the ducts are in the attic, it may be less
expensive to install the system with a roof location. The bottom line is that
you need to find a contractor who follows the procedures that are recommended
by the ACCA manuals, the manufacturer’s installation instructions, the
local and state codes and the local utility regulations. (The ACCA procedures
are required by code or regulation in many locations. Many utilities endorse
ACCA procedures.)
