MIUM0018_REV06_ QRCE_20180312-MIUM-ENG-AQ AQ_001523_02_0721
18
ENG
4.7.2 Water coil connection (CCS)
•
Water coil is provided with GAS male threaded connections.
•
The tightening must be carried out with extreme care to avoid damage to the copper headers.
•
The path of piping shall not interfere with scheduled and not scheduled maintenance operations.
•
Follow instructions of
IN plate
and
OUT plate
to connect water inlet and water outlet respectively; different
connections may lead to heating/cooling performance reduction.
To optimize the performance, air inlet side
shall be opposite to water inlet side
.
•
Provide an air valve at the top of the piping (higher than unit top side), and a water discharge valve at the
bottom of the piping
.
•
Support water piping so as not to load the coil headers.
•
Once connections are done, fix both annular external gaskets to avoid air leakage.
•
In the event of operation at very low air temperature, fill the water circuit with antifreeze; the same shrewdness
shall be carried out in the event of plant shut-off long periods at very low air temperature, if the water plant is not
emptied.
•
In the event of plant shut-off for scheduled or not scheduled maintenance, close the inlet and outlet manual cut
off valves; furthermore, empty all the water drain trays.
4.7.3 Direct expansion coil connections (CDX)
•
Just use copper pipes suitable for R410A refrigeration and size them according to the following table; all pipes
shall be preventively clean with nitrogen or dry air and shall be free from moisture.
•
Freon coil is provided with welded plugs and filled and pressurized by nitrogen (
the upper plug is covered by
insulation, it shall not be connected to the refrigerant circuit but sealed permanently
); while removing the
plugs, be sure that coil is still pressurized, otherwise it could have leakage points.
In this event, do not repair
the coil by yourself but ask for a spare section
.
•
Go on welding the connections in a workmanlike.
4.8 Electrical connections
•
Electrical connections to main board shall be carried out by
qualified personnel
only.
•
Insure that voltage and frequency shown on CE unit plate match those of connecting power supply.
•
For the main power supply of the unit and its possible accessories, the use of adapters, multiple plugs and
extension leads shall be avoided.
•
It is the responsibility of the installer to insure that the installation of the unit is as close as possible to
the main power supply, or sufficiently close to protect the electrical parts.
•
Connect the unit to an efficient power point, by using the glands near the electric box panel and the screw clamps
(for connection to PCB) and spring clamps (for connection to terminal), inside the electric box.
CDX Model
ODS Connections [mm]
Liquid line/Gas line
500
8/8
1000-1500-2000
12/16
3000
16/22
4000
22/28
Before starting any operation, be sure that main power supply is switched off.
All power lines must be properly protected at the source by the installer.
Follow the connection of the unit and its accessories using adequate cabling for the power used, and
respecting the country regulations. The dimensions of the cabling must be sufficient to support a voltage drop
in start up phase inferior to 3% of the nominal.
.
