Electrical Connection; Fresh Air Renewal - Carrier 42XPF Manual

Electrical connections
CAUTION
Make refrigerant connections before electrical
connections.
When disconnecting, disconnect electrical
connections before refrigerant connections.
Connection of the system to the mains power
supply is to be carried out in compliance with
the wiring diagram shown in the installation
instructions of the external section.
See fig. 14
Changing the Unit Setup from Under Ceiling to Wall (Console)
IMPORTANT:
The evaporator units leave the factory
configured to be installed on the wall.
Jumper positioning (J18). See fig. 15:
Units are equipped with a jumper inside the electric
control box, to make them suitable for the two
installation typologies:
Control and safety devices
The following control and safety devices are built into
the indoor units:

Fresh air renewal

Units are prearranged for introduction of renewal air
through a prepunched hole located on back side.
Back knockout allows connection of fresh air inlet duct.
Hole for external air intake (See fig. 16).
• Use locally purchased material, suitable for operating
temperatures of 60 °C (continuous).
Conduits can be of flexible polyester (with spiral core)
or corrugated aluminium, externally covered with anti-
condensate material (fibre glass from 12 to 25 mm
thickness).
• To complete the installation, all non-insulated ducts
must be covered with anti-condensate insulation (ex.
Expanded neoprene, 6 mm thickness).
Not observing of these instructions may cause
condensate dripping; the manufacturer will not be
held responsible for any damage caused.
3 42XPF
NOTES:
• For sizing of power supply wires and delay
type fuses, refer to the outdoor unit installation
instructions.
• All field electrical connections are the
responsibility of the installer.
IMPORTANT:
The units are provided with electronic control.
A time-delay device provides a 3 minute starting delay
of the compressor every time the unit is stopped or
when it is initially switched on.
Wall vertical installation: jumper inserted.
Ceiling horizontal installation: jumper removed.
To reset incorrect jumper positioning, proceed as
follows:
• Disconnect the power supply.
• Reposition the jumper correctly.
• Connect the power supply.
• Room air thermostat adjustable from 17°C to 32°C.
• Motor with overheat/overcurrent protection.
• The supplementary fan motor for outside air intake
has to be supplied separately and controlled by
a bipolar ON-OFF switch with safety fuses (field-
installed).
To adjust the fan motor air flow to the required values
it is advisable to install a speed controller.
Fresh air flow must be less than 10% of the total air
flow, to avoid operating problems.
For fresh air ventilation rates higher than 10%, a
primary air treatment system with separate deflectors
is recommended.
• Install an air inlet grille with filter inspection port to
prevent dust and dirt from entering and fouling the
indoor unit heat exchanger.
Filter installation also makes the installation of a duct
closing damper during shutdown periods unnecessary.