Carrier 42 GW Installationsanweisung Seite 30

Electrical connections
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.
Controls (type A – B)
Upon demand, the units can be equipped with one of the two types of
controls.
The controls are electronic with microprocessor regulation (A and B).
The two models of controls can be secured to the wall.
Each control regulates (alternatively with a relay
board it is possible to regulate several units with a single control see
accessories).All controls must be opened and installed only by qualified
personnel as
Control functions
ON/OFF
Three fan speeds manually selected
Fan speed automatically selected
Temperature selector
Blue LED – cooling operation
Red LED – heating operation
Yellow LED – automatic seasonal changeover
Yellow LED – energy saving
Manual seasonal changeover button
Centralised seasonal changeover button
Automatic seasonal changeover button
Energy saving button
Return air temperature sensor
Temperature sensor located on the board
Cooling / heating valve (2-pipe)
Heating valve (4-pipe)
Cooling valve (4-pipe)
Electric heater
Frost-protection
External contact
Water minimum temperature sensor
Air sampling (periodic fan starting)
Continuous ventilation
Temperature block
Autotest
Supplementary heating
28 42 GW
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).,
they contain electrical and electronic components, connected to 230V
power supply.
WARNING:
• Disconnect the power supply before opening the control cover
• All inputs (external contact, seasonal changeover etc.) must be
electrically insulated consistent with 230V requirements.
Tipo A Tipo B