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4 - COMPONENTS AND MAINTENANCE
4.10 - Optional electric heater
WARNING: Disconnect the power supply before
carrying out any work on the unit.
If the electric heater develops a fault, it must be
replaced; this requires the removal of the fan motor
assembly: Fig. 12.
CAUTION: Do not touch the live metal heater
elements when the electric heater is connected to
the power supply.
Electric heater replacement procedure:
■ Remove the filter.
■ Remove the fan motor assembly access panel.
■ Identify and note the fan speeds wired to the auto-
transformer terminal block. Disconnect the power
supply cable.
■ Remove the fan motor assembly.
NOTE: Be careful not to touch the fan blades during
the removal process to avoid unbalancing the fans.
■ Disconnect the electric heater power supply cables
and remove them through the cable conduit.
■ Unscrew the defective heater(s) and replace it (them).
■ Replacement of the fan motor assembly is by the
reversal of the above procedure.Carrier Electronic
thermostat type B is embedded with Electric heater
relay 8 Amps. Accordingly, Carrier requires an
additional protection relay for electric heater with
above 1400 W capacity.
All units delivered with an electrical box or a Carrier
controller are always equipped with a relay if the
capacity of the electrical heater is above 1400W.
WARNING : In case of customer supplied controller,
it is the responsability of the installer to set up an
additional protection relay corresponding to the
electrical heater capacity.
22
4.11 - Optional water sensor
A water temperature sensor can be provided. It has to
be installed on the water circuit as described below :
■ For 2-pipe coil : the sensor shall be installed on a
cooling water pipe (for change-over function). The
sensor is installed on a part where the water flow is
continuous.
■ For 4-pipe coil : the sensor shall be installed on a
heating water pipe (for cold-draft function that
prevents the operation of the unit when the heating
network is off).
NOTE: In case of unit with an electrical box (for
Carrier Thermostats), a "switch" is provided as an
option instead of the water sensor.
4.12 - Optional condensate pump
Check the sealing of the hydraulic connection of the
condensate pump and condensate recovery.
The meaning of the electrical wires is described below:
■ Brown - Blue wires : Electrical supply 230V 50/60Hz
■ Black - Grey wires : Alarm contact Normally Closed
(NC) 250V/8A maxi.
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