Electrical Heaters - Carrier 50NC Series Installation, Operation And Maintenance Instructions

13 - FACTORY OPTIONS AND ACCESSORIES

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:
50NC series E0L (Low)
022 to 028 9 kW
038 to 042 12 kW
058 to 086 18 kW
106 to 118 36 kW
● 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).
C
B
Number of
50NC series
frames
022 to 028 1
038 to 042
1
058 to 086 2
106 to 490
2
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.
Fixing screws to the panel
30
E0N (Nominal) E0H (High)
12 kW 15 kW
18 kW 24 kW
24 kW 36 kW
45 kW 54 kW
A
Dimensions (mm)
A B C
Coming soon
1.169 165 453
1.169 165 453
Coming soon
Wall bushing
Then the hose with the
wires for connection in the
electrical cabinet must go
through the wall bushing:
W37 KRA1/ KRA2
N o t e : S e e t h e w i r i n g
diagram included with
the unit for more detailed
i n f o r m a t i o n a b o u t t h e
wiring.
● 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).
Fixing screws
to the rail
● 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.
Manual reset (120ºC)
Automatic reset (65ºC)
Caution: Wait for electrical
heaters to cool down before
attempting to handle them.
Wall bushing
Lateral
panel