Carrier 50EN - Introduction; Operation Limits

Packaged rooftop units
3
1. INTRODUCTION
2. OPERATION LIMITS
With a condensation pressure control operating down to -10ºC.
When the outdoor temperature is usually below 5ºC WB it is
recommended installing a support element.
Inlet air conditions Cooling Heating
Indoor coil
Minimum 13ºC WB 10ºC
Maximum 24ºC WB 27ºC
Outdoor coil
Minimum
12ºC
 -12ºC WB 
Maximum 48ºC 15ºC WB
The 50EN/EH cooling units and heat pumps are autonomous air-air
units of horizontal design, rooftop type.
• 50EN series: Autonomous air-air cooling units with a compact
horizontal rooftop construction.
• 50EH series: Autonomous reversible air-air heat pump units with
a compact horizontal rooftop construction.
Packaged unit “all in one” with all components installed inside the unit.
The unit is connected directly to an air distribution ductwork without
using indoor units, a network of pipes, cables... and, therefore, without
the service space necessary for the connection of these components.
This design reduces the cost of installation, facilitates a quick
connection and ensures reliable operation.
The range of capacities of these units allows the air conditioning of
medium and large surface areas used for business or industry.
A vast number of options provide a solution to many operating
requirements, such a:
- Free-cooling.
- Air renewal.
- Air quality control (CO
2
).
- Different levels of air fi ltration.
- Active recovery of the extracted air energy.
- Back-up heating by means of electrical heaters, hot water coil and/
or gas burner.
- Heat pump adapted to extremely cold weather conditions.
These units are equipped with electronic axial fans in the outdoor
circuit, electronic plug-fans in the indoor circuit, air coils, hermetic scroll
compressors and electronic control with microprocessor, components
optimised for the R-410A refrigerant.
After manufacturing, all units are charged with refrigerant and
are tested at the factory, verifying the correct operation of all their
components within the operating range for which they are intended.
The units comply with European Directives: Machinery 2006/42/EC -
EMC 2014/30/EU - LVD 2014/35/EU - PED 2014/68/EC (Category 2)
- RoHS 2011/65/EU - Eco-design 2009/125/CE - Eco-labelling 2010/30/
EU; and with Harmonised Standard: EN 378-2:2012.
Those in charge of the installation, commissioning, operation and
maintenance of the unit must know the instructions contained in this
brochure and the specifi c technical characteristics of the installation site.