Water Connections; Electrical Connections - Carrier 42 GW Manuel D'installation

To make water connections to the heat exchanger or the valves
use threaded joints and suitable materials that can ensure perfect
tightness.
The unit is provided with inlet and outlet female connections for both
2 and 4 pipe models. An air bleed valve is also provided (See fig.
26), which can be adjusted using an 8 mm wrench.
Connections
Models
dimension (Ø)
200 3/4"
300 3/4"
400 3/4"
200* 1/2"
300* 1/2"
400* 1/2"
*Hot water circuits, four-pipe version
IMPORTANT:
• The unit must be installed in compliance with the national
standards on plant installation.
• All cables for connection to the unit, as well as its accessories,
must be H05 VV-F with PCV insulation in compliance with
EN60335-2-40.
• Disconnect all circuits from power supply before acting on
energized components.
• Make earthing before any other electric connections.
In compliance with the installation instructions, the contact opening
of all disconnecting devices (4 mm) must allow full disconnection
under the conditions of overvoltage class III.
Connect power supply L (line), N (neutral) and
according to the wiring diagram and respect the polarities shown on
the bottom of the electrical boxes, see fig. 36-38-39-40.
When connecting power supply: It is forbidden to put more than
one "ferrule"/ "wire strand" per screw clamp terminal for "hook"
connector.
All unit must be installed with a fuse for machine protection. Refer
to table I for fuse installation and replacement.
Control box panels: The control box panel is positioned on the
external side of the unit (fig. 1-2). Remove the fixing screws and
the cover of the control box panel. The control box panels contain
the terminal blocks for connections as shown in the wiring diagrams
and fig. 36-38-39-40.
WARNING : it is forbidden to supply other devices from the therminal
block
Connections
Models
dimension (Ø)
500 1"
600 1"
700 1"
600* 3/4"
701* 3/4"

Electrical connections

(earthing)

Water connections

To drain the unit completely, refer to "SYSTEM DRAINAGE"
in the Maintenance section.
Checking
On the unit startup, check if water flows correctly from the pump or
check the pipe slope and make sure the pipes are not obstructed.
Table X
Kind of unit fig. 36 fig. 38 fig. 39
42GW__0_____ x
42GW__0 K____ x
42GW__9 K____ x
42GW__9_____
42GW__9K__C_
42GW__0K__C_
42GW__0___C_
42GW__0___D_
42GW__0J____
IMPORTANT:
• To power the unit, use cables with minimum section as
according to table II.
• After all connections are made, fasten the cable using the
special tear protections (ref. 19).
• Close the control box panel with the protecting cover and
tighten the screw(s) which were previously removed.
Units with electric heaters
The electric heaters are activated by the CARRIER type "B" control.
The unit is equipped with two safety thermostats: one automatic
reset thermostat and one manual reset thermostat which can be re-
activated, fig. 32 (ref. A) to protect the unit against overtemperature
caused by dirty filters or clogged air flow.
The manual thermostat must be reset by skilled personnel only
after the cause for which the intervention was required has been
removed.
The use of hot water and electric heaters is allowed only
if the "Booster Heating" option is active (control B +
42N9084 kit).
fig. 39e fig. 39f fig. 39g fig. 39h fig.40
x
x
x
x
x
x
42GW 35