Carrier 50NC Series - Electrical Heaters

30
13.4 Electrical heaters
● The auxiliary electrical heaters are ready for operation in two
power stages. These heaters are managed by the electronic
control of the unit that can activate them in the following cases:
- As a backup 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 a backup in COOLING mode in accordance with the
return and supply temperatures.
● Up to 3 values of total power available for each model:
13 - FACTORY OPTIONS AND ACCESSORIES
50NC series E0L (Low) E0N (Nominal) E0H (High)
022 to 028 9 kW 12 kW 15 kW
038 to 042 12 kW 18 kW 24 kW
058 to 086 18 kW 24 kW 36 kW
106 to 118 36 kW 45 kW 54 kW
A
B
C
50NC series
Number of
frames
Dimensions (mm)
ABC
022 to 028 1 Coming soon
038 to 042 1 1.169 165 453
058 to 086 2 1.169 165 453
106 to 490 2 Coming soon
● The electrical heaters are supplied in one or two frames
(depending on the model) for assembly and connection at the
outlet of the supply fan (indoor module).
Note: In models with two frames, the electrical heaters are
distributed as symmetrically as possible between both frames.
● The frame must be fi xed to the supply panel of the indoor
module using self-drilling screws (factory provided), in the
positions marked on the panel.
Manual reset (120ºC)
Automatic reset (65ºC)
● Each frame incorporates two safety thermistors to protect the
unit from excessive temperature.
One of them has an automatic
reset (AR) and tare value at 65ºC,
the other one has a manual reset
(MR) and tare value at 120ºC.
Then the hose with the
wires for connection in the
electrical cabinet must go
through the wall bushing:
W37 £ KRA1/ KRA2
Note: See the wiring
diagram included with
the unit for more detailed
information about the
wiring.
Lateral
panel
Fixing screws
to the rail
Wall bushing
● The frame provides access to the electrical heaters through
the side panel. In the case of 2 frames, they are placed
symmetrically to allow easy removal of the heaters, that is,
one with access from the right and the other from the left.
To remove the electrical heaters, follow these steps: fi rst,
unscrew the side panel of the frame (self-drilling screws).
Then, disconnect the wires from the electrical cabinet and
remove the hose. Finally, unscrew the fi xing screws of the
heaters located on both the lower and upper rails (self-drilling
screws).
Wall bushingFixing screws to the panel
Caution: Wait for electrical
heaters to cool down before
attempting to handle them.