Hoval RoofVent CON-9, Design Handbook

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7 Transport and installation
7.1 Assembly
Caution
Risk of injury as a result of incorrect handling. Have
transport and assembly work carried out by trained
specialists !
RoofVent
®
LH units are delivered in 2 sections (roof unit,
below-roof unit) on a wooden pallet. Parts which belong
together are labelled with the same unit number.
Note
Depending on the optional components, the delivery
may consist of multiple parts (such as when a supply
air silencer is installed). In this case a forklift truck or
a crane is required for assembling the below-roof unit
on site.
The following guidelines are important when preparing for
assembly:
■ The units are assembled from roof level. A crane or heli-
copter is required.
■ To transport the unit to the roof, 2 hoisting slings are
required (approx. length 6 m). If steel cables or chains are
used, the unit corners must be properly protected.
■ Make sure that the roof frames correspond to the specifi-
cations in Section M 'System design.'
■ Define the desired orientation of the units (position of the
coil connections).
■ The units are held in the roof frame by means of their own
weight. Silicone, PU foam or similar is required for sealing.
■ For units with exhaust air silencers, additional attachment
to the roof frame is required.
■ Follow the assembly instructions included.
Fig. I5: RoofVent
®
roof
units are installed from
roof level.
7.2 Hydraulic installation
Caution
Risk of injury as a result of incorrect handling.
Hydraulic installation must be carried out by trained
specialists only !
The Hoval DigiNet control system is designed for a distributor
circuit with separate hydraulic connection of the units; i.e. a
mixing valve is installed in front of each unit. The diverting
system is used as standard.
Boiler system requirements
■ Adjust the hydraulic system to the control zone divisions.
■ Hydraulically coordinate the pipework for the individual
units within a control zone to ensure even distribution.
■ Starting at a fresh air temperature of 15 °C, the heating
medium (max. 120 °C) must be available at the mixing
valve without delay in the required amount and at the
required temperature.
■ A flow temperature control which is dependent on the
fresh air temperature is required.
The Hoval DigiNet control system switches on 'Enable
heating' for 1 minute once a week. This prevents the main
pump from blocking after a prolonged shutdown.
Pipework requirements
■ Use 3-way mixing valves with linear characteristics and
high quality.
■ The valve authority must be ≥ 0.5.
■ The valve actuator must have a short run time (5 s).
■ The valve actuator must be continuous, i.e. the stroke
changes in proportion to the control voltage (DC 0…10 V).
■ The valve actuator must be designed for emergency
operation with a separate manual control (AC 24 V).
■ Install the valve close to the unit (max. distance 2 m).
Caution
Risk of injury from falling parts. Do not apply any
loads to the coil, e.g. by means of the flow or return!
Note
Use the 'Hydraulic assembly' or 'Magnetic mixing
valve' options for quick and easy hydraulic installa-
tion.
RoofVent
®
LH
Transport and installation