Water Connections; Electrical Connections - Carrier 42N_S Installation And Operation Manual

Water connections

Water piping can enter either from the floor or from the wall. Leave
the space shown in the figure 21-22. The unit coil can be supplied with
water connections positioned as requested. However field conversion of
the connections is achieved quite simply as follows:
Remove the control box panel;
Unscrew the 6 self-threading screws and remove the front drain pan;
Unscrew the two screws holding the heat exchanger to the structure,
necessary for earthing the coil;
Remove the coil by unhooking it with the rubber tabs and turn it
horizontally through 180°;
Place the coil into its new position by hooking it using the special
rubber tabs;
Refit the front drain pan with the 6 self-threading screws;
Retighten the two screws holding the heat exchanger to the structure,
necessary for earthing the coil (Fig. 23, rif. 8);
Position the control box panel opposite the coil connections;
Place the temperature sensor into its seat and seal with filler (see fig.
23 - rif. 7);
Position the control into the tabs provided,, blocking it with the
supplied metal plate (see paragraph "Controls");
Change the position of the condensate drain closing plug of the drain
pan and put it on the same side of water connections.
NOTE: The connection pipes must be insulated with a condensation-
proof material such as polyurethane, propylene or neoprene of 5 to 10
mm thickness.
NOTE 1: On units with valves already installed, reversal of the coil can be
made by ordering the corresponding valve kit.

Electrical connections

Install the unit according to the national standards on plants.
Connect L (LINE) ,N (NEUTRAL) e
fig. 27-28-29-30.
The fuses on the mains, as shown in the wiring diagrams, are those
mentioned in table II. These fuses shall be supplied by installer.
IMPORTANT:
electrical components.
Remove the control box panel casing by means of the fixing screw/s.
According to the installation instructions, the disconnecting switches
42N_S 42N_E
24
(EARTH) power supply as shown in
Automatic water valves
(See fig. 25-26)
The fan coils can be equipped with valves, both in 2-pipe or 4-pipe
versions. We recommend using the valves in order to prevent
condensate formation on the unit when the fan is not working and
room humidity is very high.
The valve heads are thermal type with 230V power supply, average
consumption 2,5 VA, maximum operating pressure 1400 kPa.
Opening time depends on the temperature and is from 120 to 240
seconds. The tightness of the connections is ensured by a rubber sealing
(O-RING) inserted in the connection (tightening torque 30 Nm).
If valves are installed by the installer (accessories), do not forget to use
the (O-RING) sealing ring supplied.
The motorized valves can be 3-way with bypass or 2-way. Make sure that
all unit pipe connections are aligned and well supported, to prevent
abnormal strains on the unit. Check for leaks after the system has been
filled with water. Once water connections are completed, check for
tightness, use nylon strips to close the shell and insulate the valve
and make sure that all cold parts are properly insulated (fig. 25-26). For
2-way valve units, close the free space of the insulating shell using the
plug supplied (fog. 26c). Fix the insulating shell using nylon strips (fig.
26a). Make sure the pipe insulation is correctly positioned inside the
shell (fig. 26a) to prevent condensate on the pipes. The manufacturer
cannot guarantee seal quality and tightness of the valve group provided
by the installer (which is therefore not factory tested). The manufacturer
thus declines all responsibility for possible malfunction of said items and
for damage resulting from leaks in said items.
WARNING: After the electric control panel has placed on the opposite
side, connect the ground to the unit's frame (see fig. 23, - rif. 8).
from the mains power supply should have a contact gap (4 mm)
such that total disconnection can be ensured under the conditions
provided for by overvoltage class III.
All fan coil connecting cables as well as accessory wires must be of
the H05 VV-F, type with PVC insulation according to the EN 60335-
2-40 standard.
The cables used to connect power supply should be of the same
section indicated in table II.
Use the special cover and the screw or screws previously removed to
close the control box panel after electrical connections are completed.
CONTROL BOX PANEL: The control box panel is always positioned
opposite the water connections.
Terminal boxes for connections are contained into the control box
panels. (see fig. 27-28-29-30).