Carrier 42 GW - Page 22

22 42GW
IMPORTANT:
• The unit must be installed in accordance with the local regulations
governing installations.
• All cables for connection to the unit, as well as its accessories,
must be H05 VV-F with PCV insulation in compliance with
EN60335-2-1.
• Disconnect the power from all the circuits before accessing live
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 (
phase ), N (neutral) and (earthing)
according to the wiring diagram and respect the polarities shown on
the bottom of the electrical boxes, see g. 36-38-39-40.
When connecting the power supply, it is forbidden to insert more
than one electrical wire per terminal clamp.
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 (g. 1-2). Remove the xing 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 g. 36-38-39-40.
WARNING : it is forbidden to supply other devices from the therminal
block
Table X
Kind of unit g. 36 g. 38 g. 39 g. 39e g. 39f g. 39g g. 39h g.40
42GW__0_____ x
42GW__0 K____ x
42GW__9 K____ x
42GW__9_____ x
42GW__9K__C_ x
42GW__0K__C_ x
42GW__0___C_ x
42GW__0___D_ x
42GW__0J____ x
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 heater
The unit is equipped with two safety thermostats: one with automatic
reset and one with reactivatable manual reset g. 32 (ref. A), to protect
the unit against overheating due to insufcient cleaning of the lters or
obstructions to the air ow.
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).
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 g.
26), which can be adjusted using an 8 mm wrench.
Models
Connections
dimension (Ø)
Models
Connections
dimension (Ø)
200 3/4" 500 1"
300 3/4" 600 1"
400 3/4" 700 1"
200
(1)
1/2" 600
(1)
3/4"
300
(1)
1/2" 701
(1)
3/4"
400
(1)
1/2" - -
(1) Hot water circuits, four-pipe version
To drain the unit, refer to the paragraph "DRAINING THE
INSTALLATION" in the Maintenance section.
Checking
On the unit startup, check if water ows correctly from the pump or
check the pipe slope and make sure the pipes are not obstructed.
Water connections
Electrical connections