Cabinets
All components exposed to products of combustion are manufactured
from aluminised steel. Exterior panels have a durable epoxy powder coat
finish.
Heat Exchanger
The Thermocore venturi tube heat exchanger assembly is manufactured
from special grade aluminised steel. For applications using fresh air or
where the temperature rise across the unit is less than 22oC,
optional stainless steel (AISI 409) heat exchangers are recommended. For
areas where chlorinated vapours may be present, corrosion resistant
stainless steel (AISI 316) should be specified.
Burners
Corrosion resistant aluminised steel burners with stainless steel
ribbons are mounted in a slide-out burner tray. The burner tray
withdraws from the left side of the unit (when facing the air
discharge), opposite hand units are available as an option.
Gas and Safety Controls
A multi functional gas control valve and a fully automatic
ignition system provide full safety monitoring of the heater
operation. Fan operation is controlled by an integral fan control
which delays start up until the unit has reached operating temperature
and continues to operate the fan after the burners have shut off,
until all useful heat has been dissipated into the building. A
differential pressure switch monitors the operation of the integral
power flue venter, so that in the event of a flue or combustion air
blockage or failure of the venter fan, the unit would not operate.
A limit switch thermostat shuts down the heater in the event of overheating. For additional safety a dual limit thermostat is fitted on all EnviroAir units.
Air Handling
STA fan models are fitted with direct drive axial flow fans and
single phase 230V motors. STA units are supplied complete with
horizontal louvres.
STB and STE centrifugal fan models are fitted with double inlet, centrifugal blowers, and a belt drive with an adjustable motor pulley to allow small on-site adjustments to be made. Standard units are fitted with single phase 230V motors, optional three phase motors are available for increased duty.
STB and STE are supplied as standard with a duct outlet spigot for connection to ductwork. The data table indicates the airflow and static pressure available for ducted applications with the standard motor. For higher airflows or for static pressures up to 400 pascals, larger motors may be specified. The data table indicates the maximum airflows, excluding filter and damper resistance.
TECHNICAL DATA
| 100 | 125 | 150 | 175 | 225 | 300 | 400 | ||
| NOMINAL HEAT OUTPUT | kW | 23 | 28 | 34 | 40 | 50 | 69 | 91 |
| GAS RATE G20 Natural Gas | m³/h | 2.75 | 3.36 | 4.07 | 4.76 | 6.03 | 8.25 | 11.01 |
| GAS CONNECTION | BSP in | ¾ | ¾ | ¾ | ¾ | ¾ | ¾ | ¾ |
| FLUE DIAMETER | mm | 100 | 100 | 100 | 130 | 130 | 130 | 130 |
| COMBUSTION AIR INLET | mm | 100 | 100 | 100 | 130 | 130 | 130 | 130 |
| AXIAL FAN MODELS STA | ||||||||
| AIRFLOW FREEBLOWING | m³/h | 1700 | 2400 | 3700 | 3700 | 4200 | 5600 | 7900 |
| MOTOR RATING | kW | 0.075 | 0.12 | 0.12 | 0.12 | 0.12 | 2 x 0.12 | 2 x 0.12 |
| MOUNTING HEIGHT | m | 2.5 | 2.5-3.0 | 2.5-3.0 | 2.5-3.25 | 2.5-3.5 | 2.5-3.5 | 2.5-40 |
| THROW * | m | 17 | 20 | 28 | 28 | 28 | 32 | 38 |
| WALL OPENING | mm | 140 | 140 | 140 | 185 | 185 | 185 | 185 |
| ROOF OPENING | mm | 150 | 150 | 150 | 200 | 200 | 200 | 200 |
| CENTRIFUGAL FAN MODELS STB & STE | ||||||||
| AIRFLOW FREEBLOWING | m³/h | 2200 | 2600 | 3600 | 4150 | 5000 | 6800 | 8600 |
| MOUNTING HEIGHT | m | 3.0 | 3.0 | 3.0-3.5 | 3.0-3.5 | 3.0-4.0 | 3.0-4.5 | 3.0-5.0 |
| THROW * | m | 24 | 25 | 30 | 31 | 32 | 34 | 47 |
| MOUNTING HEIGHT c/w 90° | m | - | - | 3.0-6.0 | 3.0-6.0 | 3.5-7.0 | 4.0-4.5 | 4.0-10.0 |
| STANDARD MOTOR | kW | 0.18 | 0.18 | 0.37 | 0.37 | 0.55 | 0.75 | 0.75 |
| AIRFLOW DUCTED (Standard Motor) | m³/h | 1900 | 2100 | 3000 | 3500 | 4200 | 5800 | 7300 |
| MAXIMUM PRESSURE (Standard Motor) | kW | 100 | 100 | 150 | 100 | 100 | 100 | 100 |
| MAXIMUM MOTOR SIZE | kW | 1.1 | 1.1 | 1.5 | 1.5 | 2.2 | 3.0 | 3.0 |
| MAXIMUM AIRFLOW | m³/h | 3000 | 4000 | 5000 | 5000 | 7200 | 9000 | 12,000 |
| MAXIMUM PRESSURE AT MAXIMUM AIRFLOW | Pa | 400 | 400 | 400 | 400 | 150 | 400 | 200 |
| MAXIMUM AIRFLOW AT 400Pa | m³/h | 3000 | 4000 | 5000 | 5000 | 6400 | 9000 | 11,000 |
* Throw depends on height of building, mounting height of heater, room temperature and louvre settings
