Carrier Atmosphera 42EM series - Room Thermostat Control Configurations

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6.1 - Control with room thermostat only
The 42EM Atmosphera can be controlled by a Carrier room
thermostat.
6.1.1 - Standard configuration
The 42EM Atmosphera can be equipped with a plug-in quick-
connect terminal board to connect the various cables:
- from the fan motor assembly
- from the valve actuator(s)
- from the electric heater
- from the heating/cooling changeover valve (if used - this
is the changeover contactor for the 42EM configuration
with cooling or heating only coil).
This plug-in quick-connect terminal board is installed on a
DIN rail and protected by a plastic cover.
6.1.2 - Other possible configurations
6.1.2.1 - 6 speeds on external terminal board
For certain applications, the 42EM Atmosphera can be equipped
with metal box incorporating a plug-in quick-connect
terminal board to connect the various cables:
- from the fan motor assembly
- from the valve actuator(s)
- from the electric heater
- from the heating/cooling changeover valve (if used - this
is the changeover contactor for the 42EM configuration
with cooling or heating only coil).
With this option the six fan motor speeds are available from
this terminal.
This plug-in quick-connect terminal board is installed on a
DIN rail.
In addition a fuse is also installed on this DIN rail and an
ON/OFF switch is included on the metal box.
In this version the Atmosphera can operate in three fan speed
mode, controlled by a Carrier room thermostat (controlling
three speeds of the six speeds available on the unit terminal
board).
6.1.2.2 - 6-speed switch
For certain applications, the 42EM Atmosphera can be equipped
with a six-position speed selector installed on a metal box
incorporating a plug-in quick-connect terminal board to con-
nect the various cables from the fan motor assembly, the valve
actuator(s). the electric heater and from the heating/cooling
change-over valve (if used - this is the changeover contactor
for the 42EM configuration with cooling or heating only coil).
This plug-in quick-connect terminal board is installed on a
DIN rail.
In addition a fuse is also installed on this DIN rail and an
ON/OFF switch is included on the metal box.
In this version the customer selects the desired speed directly
on the unit, and the room thermostat controls the opening and
closing of the cooling and heating valves.