Hydraulic Connections; Operating Face; Coil Water Connections - SystemAir DUCTYS series Installations- Und Wartungshandbuch

7. HYDRAULIC CONNECTIONS

The fan-coil units may contain a small amount of oil incompatible with plastic
polyethylene piping (PER/HTA/PVC). The coil should be rinsed out before use to avoid
any problem.
It is the installer's responsibility to contact their pipe supplier and take into account the
general instructions for the use of plastic pipes (PER/HTA/PVC).

7.1. OPERATING FACE

The service panel of the Left / Right versions is defined according to the location of the hydraulic unions when the
unit is viewed by the operator from the "blowing face".
Note: In the example below, the operating face is on the right.

7.2. COIL WATER CONNECTIONS

The units are equipped, in their standard 2-pipe configuration, with a main chilled water coil with 2 rows (DUCTYS
1000), 3 rows (DUCTYS 1500-2000-2500) and 4 rows (DUCTYS 4000).
In the 4-pipe configuration, the unit is equipped , in the same block with 3 rows (DUCTYS 1000), 4 rows (DUCTYS
1500-2000-2500) and 5 rows (DUCTYS 4000), with chilled water coil and heated water coil (on an independent
circuit).
The coil headers are equipped with air vent and drain plug. To vent the air from the coil, use the air vent located
on the upper part of the upper header. To drain the water, use the drain plug located on the lower part of the lower
header.The coil(s) MUST be drained of fluid in the event of the unit being kept out of service in buildings subjected
to negative ambient temperatures with the possibility of the coil icing.
In certain cases the tubes of bottom are not drainable. However, the hydraulic connections
on the lower part of the coil should be vented to the atmosphere by disconnecting all
connectors, valves and pipes from the main hydraulic circuit.
Flexible pipes are recommended for connecting the coils. Take care not to over-tighten the water connections.
Over-tightening can lead to excessive strains on the materials in the event of major temperature variations.
All the water pipes must be insulated to avoid sweating and heat loss.
The supply water (2-pipe and 4-pipe coils) should pass through the bottom header.
To avoid damaging the coil, tighten the water pipe connectors on each header
using a counter-wrench.
When installing the unit, take care not to push the coils headers towards the
inside of the unit when tightening the connections.
8
OPERATING
FACE