Filter And Access; Electric Heater; Fresh Air Supply - Lennox ARIA EC Series Application Manual

Electric heater

The electric heater is of the bare wire resistive type installed in the fan
discharge air stream, assuring optimum coverage and maximum heat
exchange.
Available as standard with a capacity of 500, 800, 1200, 1500 or 3000
Watts, the 230 V/1/50 Hz power supply is provided directly from the
controller or via a relay and a fuse.
The heater is provided with 2 levels of safety :
•
A manual reset thermostat, which is reset is by switching off the power, and has a trigger temperature
75°C; whilst this is off a PTC coefficient resistance with a separate supply prevents the automatic reset
of the coil whilst it remains under voltage. Restarting is done by coil supply voltage cut-off. This safety
thermostat protects the unit from over heating due to the absence of airflow.
•
A fusible link, rated at temperature152 °C (± 16 °C). Replacement of heater assembly will be required if
this blows, after establishing the cause of the fault.

Filter and access

ARIA EC is available as standard with a G3 efficiency throwaway filter, 15 mm
thick, which is accessible from the underside of the unit. Fire classification M1.
As an option, ARIA EC unit can be provided with a G4 filter, 20 mm thick, with
access from the underside of the unit.

Fresh air supply

The external diameter of the connection spigot is either 99 mm or 124 mm depending upon the type of controller insta
(8.3 or 44.4 l/sec.).
The available controllers are :
Diameter 99 mm : 8.3 to 25 L/sec (30 to 90 m3/h – 10% / + 20%)
Diameter 124 mm: 20.8 to 44.4 L/sec (60 to 160 m3/h –10%/+ 20%)
The airflow of the 124 mm diameter fresh air controller can be easily modified on site by repositioning the baffles
inside the controller; an instruction label for this procedure is located on the unit close to the spigot.
ARIA EC-AGU-0909-E
ARIA EC units can be provided with a fresh air connection spigot as an
option allowing the each space to be supplied with fresh air as required by
regulations.
Each spigot can be fitted with a constant volume fresh air controller to set
the air flow to a predefined value. The air volume is precisely controlled for
variations in the system duct pressure between 50 and 200 Pa.
The fresh air connection is located before the fan and heat exchanger coil.
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