RTLH RoofTair (Airwell) - Certus

Technical Features (continued)
Exhaust options :
- Depression shutter
- Exhaust blower
RETURN AIR
ROOM
D2
FILTER
IC
HWC
IFAN
HEAT
FRESH AIR
SUPPLY AIR
D1
Legend :
D1
Fresh air damper
D2
Return air damper
IC
Indoor coil
OC
Outdoor coil
C1-2 Compressor
IFAN
Indoor fan, Main blower
HEAT
Electric
HWC
Hot water coil
FILTER
G4, F6
C
1 2
OC1
OC2
C
The economizer reduces the operational time of the compressors using
outdoor air to satisfy the cooling or heating demand.
• Outdoor air damper closed on OFF periods.
• Outdoor air damper closed on start-up, morning warm-up and night-setback
modes for an economic operation.
The 2-damper configuration is suitable only for bottom or side return air
configurations (R1 and R2).
• A retractable rain hood with bird screen is factory-assembled.
• Moisture eliminator on fresh air is optional.
Options of exhaust air on the economizer
Depression shutter (not compatible with R2)
• Not compatible with the exhaust blower.
• Exhaust air system with barometric damper to assist natural building depressurization
when the return air damper is closed.
• One-way depression shutter closed on OFF periods to avoid outdoor air
intake.
• Supplied with retractable rain hood to ease transportation.
Exhaust blower (not compatible with R2)
• Exhaust air blower kit, for mechanical removal of used air from the
building, when the ducted return air is designed at pressure drop higher
than the building natural leakage rate.
• Used when economizer is fitted on the unit. Activated by the control when
fresh air damper is 100% open.
• The blower exhausts up to 25% of the nominal air volume on closed
return air damper.
• Installed at 90° from the outdoor air intake to avoid air short-circuiting.
Manual 25% fresh air function
• Factory fitted manual outdoor air system to ventilate the building with
outdoor air up to 25% of nominal air volume.
• Not compatible with the economizer.
• Retractable rain hood to ease transportation.
• Bird screen.
• Non-return shutter closed during OFF periods, preventing infiltrations of
outdoor air.
• Moisture eliminator is optional (factory-fitted or field-installed).
Hot water heating
• Hot water heater available on all air flow configurations.
• 1 or 2 row coil mounted on a sliding rail and covers the entire surface of
the indoor DX coil. Advantages :
- Low air face velocity
- Low noise level
- Low pressure drop (approx. 10 Pa)
• Located downstream of indoor DX coil.
• Access hinged door with quater-turn fasteners to ease service.
• 3-way valve with copper plumbing and anti-freeze thermostat fitted at the
factory inside the unit.
Electric heat (S1 and S3 configurations)
• Electric heaters available on down flow (S1) or front flow (S3) supply air
configuration.
• The electric heaters are made of smooth stainless steel tubes and placed
in a slide drawer.
• Two capacities are available for all models, low (CH1) and high (CH2)
capacity.
• Electric heaters supplied with two manual and automatic reset safety
thermostats.
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