6 - CONNECTIONS
6.1 - Air connections
■
Indoor unit
The air connection is made using rigid ducts in sheet steel or similar, fitted with a drilled connection flange. It is secured with self-tapping
screws. A gasket should be fitted between the flange and the unit.
For units to be fitted as UNDER models (air discharge to the ground), a support base is available as an option to enable this. If the
raised floor allows, a single hole is required, in the raised floor itself, with the same dimensions as the base. Tightness will be ensured
by fitting a gasket between the unit and the support frame.
6.2 - Hydraulic connections
The hydraulic pipes must be routed through the plate provided for this purpose.
UNDER
(removable bottom or right-hand side plate)
1 - Remove the precut foam panel,
2 - Drill the external panel,
3 - Make the correct cut-outs in the plate
4 - Put it back in place before routing the tubing, and
seal
to prevent
any air bypass.
OVER
(Routing on the right-hand side)
■
Condensate drain
-
Fit a siphon: H = 100 mm
-
If the humidifier option is selected: the drained water will not flow into the unit's drain pan.
-
To have a single drain for both, connect the humidifier drain after the unit's drain pan.
-
Two wrenches must always be used when connecting or tightening couplings to avoid bending pipes.
-
When the condensate pump option is present, it is fitted inside the unit (connection via a flexible pipe 5 mm in diameter), if the
humidifier option has not been selected.
Warning: the operating pressure on the chilled or hot water network must not exceed 8 bar.
■
Diameters of water coil connections
Unit W
W5
W8
W12
W16
W27
Cooling coil
Inlet
G1/2" M
G3/4" M
G3/4" M
G3/4" M
G1" M
Outlet
G1/2" M
G3/4" M
G3/4" M
G3/4" M
G1" M
Unit W
X unit
W5
X5
W8
X8
W12
X10
W16
X 12/15
W27
X 19/24
X 31/36
X 38/48
Heating coil
Inlet
G1/2" M
G1/2" M
G1/2" M
G1/2" M
G3/4" M
G3/4" M
G3/4" M
Outlet
G1/2" M
G1/2" M
G1/2" M
G1/2" M
G3/4" M
G3/4" M
G3/4" M
Refer to the section on the "Humidifier" to connect the humidifier.
6.3 - Refrigerant connections, Unit X
■
Installation precautions
-
The refrigerant connections between the unit and the condenser must be made by qualified personnel.
-
Only insulated copper refrigeration pipes must be used.
-
This network must be designed and constructed correctly in order to ensure the entire system operates correctly.
-
The pipes must be sufficiently flexible to withstand fluctuations in length, expansion and contraction.
-
The liquid line must be angled to ensure it always conveys the fluid to the unit.
It is important to avoid:
-
Excessive refrigerant fluid loss,
-
Accumulation of oil,
-
Liquid ingress into the compressor, either when operating or idle,
The pipe route must:
-
not hinder, nor be hindered by, the existing installation,
-
be protected against accidental shocks,
-
be visible in its entirety, and not be encased in plaster or concrete.
-
The height differences and equivalent lengths between the indoor and outdoor unit must meet the recommendations (see Table).
-
The pipe dimensions must ensure a minimum pressure drop, and the minimum and maximum speeds must be complied with to
ensure correct circulation of the gas and movement of the oil.
-
Fit oil traps every 4 metres on the vertical columns to ensure the oil is returned to the compressor.
-
Check that no contamination has fallen into the tube.
-
Carry out all brazing operations using a nitrogen purge.
48
