Specification Guide - Carrier Atmosphera 42EM Series Manual

11 - SPECIFICATION GUIDE

• Supply 42EM Atmosphera fan coil units in accordance
with the certified drawings.
• The performance of each 42EM unit shall conform to the
published technical and performance data.
• The casings of 42EM units shall be made from 1.2 mm
thick galvanised sheet steel, thermally and acoustically
insulated, and shall be provided with adequate access for
service and maintenance. 42EM units shall be provided
with suspension lugs with rubber anti-vibration mounts.
• The supply and return air connection spigots (199 mm
diameter, depending on the size) shall be integral with
each 42EM unit.
• The fresh air connection spigot, of 125 mm external
diameter, shall be integral with each 42EM unit.
This shall be connected to the primary air duct using
flexible ducting available as an optional item.
• 42EM units shall be equipped with either a cooling/
heating changeover coil, a monobloc heating and cooling
coil or a cooling coil and an electric heater. The water
coils shall be provided with manual air purge valves.
• The cooling and heating coils shall be made from copper
tubes of 3/8" external diameter and aluminium fins. The
maximum water side working pressure shall not exceed
10 bar (1000 kPa).
• The aluminium drain pan beneath the coil and valves
shall be monobloc to avoid the possibility of leaks.
• The two-way or three-way on/off water flow control
valves shall be provided with flexible water pipes with
1/2" BSP union nuts to simplify connections on site and
maintenance and servicing work.
• 42EM units supplied shall be provided with disposable
85% gravimetric (EU3 or G3) and M1 fire class filters.
• Filter access shall be:
- From below the unit for ducted models,
- From the rear of the unit for non-ducted models.
• Fans shall be a double-inlet centrifugal forward-curved
type, with 1 or 2 fans per unit depending upon unit size.
• The direct-drive fan motor shall be connected to the 3-
speed terminals of the controller. It shall be protected
against overloads. Motor connections shall conform to
Class B for insulation and Class F for varnish.
• 42EM units shall be suitable for connection to electronic
controllers (wall-mounted thermostats) which enable the
user to change the fan speed manually so as to adjust the
unit's heating and cooling capacity.
• Electrical connections carried out on 42EM units shall be
the quick-connection type in order to simplify
maintenance. A plastic cover shall protect the terminals.
Order No.: 14225-20, 06.2005. Supersedes order No.: New
Manufacturer reserves the right to change any product specification without notice.
Numerical control
• The numerical controls shall use the CCN (Carrier
Comfort Network) communication protocol.
These controls shall have the following functions:
- Control of the Atmosphera fan speed.
- Control of the water flow through the on/off type
two or three-way valves with reference to internal
and external loads, in order to maintain a constant
ambient temperature in the conditioned space.
- Provide on/off control of the resistance wire type
electric heater.
- Be controlled by a Zone User Interface.
• The power supply to the controller shall be 230 V a.c.
± 15% single-phase, 50 Hz, to avoid the need for a
transformer. The electric heater shall be controlled
directly from the Maestro or Aquasmart controller to
avoid the need for a power Triac.
Manufacturer: Carrier s.a., Montluel, France
Printed in Holland.