Carrier 50EN - Electrical Heaters

Packaged rooftop units
23
Electrical heaters
- The auxiliary electrical heaters are ready for operation in two power
stages. This heaters are managed by the electronic control of the
unit that can activate them in the following cases:
• As support in HEATING mode, following the input of all the
available compressors.
• In HEATING mode, instead of compressors.
• During the defrosting operation if selected as support.
• As support in COOLING mode in accordance with the return and
outlet temperatures.
Kit assembly:
When the frame with the electrical heaters is provided in a kit, follow
the steps below for connecting it:
Step 1: the resistors are sent divided into 1 or 2 frames, depending on
the required power, as shown in the following table:
To attach these frames to the unit, two supports are provided. These
supports must be screwed with the four Allen M4 screws included in
the kit.
The height of the frame on the support will depend on the position of
the discharge, since it should never be behind the fan volute.
For example, in the following diagram, the frame location will be valid
for lower and side discharge.
Output (kW)
12 18 27 36 45
Stages (kW)
6 + 6 9 + 9 9 + 18 18 + 18 18 + 27
No. of frames
11122
Step 2: attach the
supports with the
frames linked inside
the unit. To that
extent, drills have
been made in the
unit to which the
supports must be
screwed.
Supports attached to the unit
Access panel
Step 3: Take the hoses with the electric power supplies to the main
electric panel of the unit. On the wiring diagram supplied with the unit
an illustration is included with the implantation in the platen of all the
components.
Important: The connection of the necessary elements for the adequacy
to the operation of the unit must be performed by the installer. The kit
is supplied with the required electric material: thermistors, contactors,
hoses, etc.
Supports
attached
to the unit
Safety thermistor location
Holes for screws M4 for
attaching to the unit
Electric power supply outlet
Holes for M4 screws for
attaching to the unit
Supports for attaching to the unit
Holes for M4 screws for
attaching to the unit
- Assembly and connection inside the unit. The electrical heaters
acquired with the unit will be incorporated to it modifying the electric
panel in the factory, so that it is compatible with the electronic control.
- The electrical heaters requested for units already shipped will be
sent in a kit, and the installer will need to assemble the necessary
elements for the operation of the unit to assemble and for the
compliance with the legal regulations that are applied to the modifi ed
unit in terms of safety.
Note: Consult the available capacities in the technical brochure.