16
Start-Up Preparation and Commissioning
Commissioning
The air-handling unit may be commissioned only by a properly quali-
fied person. Prior to first start-up of the air-handling unit, an inspec-
tion of the wiring of all connected components of the air-handling unit
must be performed by a qualified technician.
Safety Measures
The sections which can generate some injury hazards (electric
shock, rotating parts, etc.) or connection points (heating water
inlets/outlets, air flow direction, etc.) are always labelled with
warning or information labels.
It is forbidden to start the fans of the air-handling unit if the panels
are open or removed. The hazard of trapping by movable parts is
indicated by a label situated on the service door of the air-handling
unit. Service doors must always be closed during air-handling unit
operation and the lockable closure of the fan chambers must be
locked with a key to prevent unauthorised access.
Before starting any work on the fan section, the main switch must
always be turned off and secured to avoid accidental starting of
the motor during service work on the fan section.
When emptying the heat exchanger, the water temperature must
be below +60 °C. The connecting piping of the heater must be
insulated so its surface temperature will not 60 °C.
It is forbidden to remove the service panel of the electric heater
if energized, or to change the factory settings of the safety
thermostat.
It is forbidden to operate the electric heater without the outlet
air temperature control and without ensuring the steady flow of
transported air.
Controlled run-down of the fans must be ensured upon the gas
heater section shut-down to avoid the exchanger overheating,
and simultaneously, the outlet air temperature behind the gas
heater, respectively ambient temperature of the burner, must not
exceed 40 °C.
After being set by the expert, the parameters of the gas heater
must stay unchanged to maintain safe and trouble-free operation.
Inspection Prior to First Start-Up
General Checks
The service panels are provided with hinges and external closures.
The closure simultaneously serves as a handle. A special tool –
a wrench – is needed to open/close the closure.
Check alignment of the air-handling unit
Check whether all components of the air-handling unit are installed
and connected to the air distributing ducting.
Check whether all cooling and heating circuits are connected, and
whether energy media are available.
Check whether all electrical appliances are connected.
Check whether all condensate draining kits are connected.
Check whether all M&C components are installed and connected
Electric Wiring
Check the proper wiring of all individual electrical components
of the air-handling unit according to the corresponding wiring
diagrams.
Filter Sections
Check the condition of filters.
Check the fixation of filters.
Check the settings of differential pressure sensors
Water and Glycol Heater Sections
Check the condition of the heat-exchange surface.
Check the condition of the inlet and outlet piping.
Check the condition of the mixing set.
Check the condition, connection and installation of antifreeze
protection components.
Electric heater Section
Check the condition of the heating coils.
Check the connection of the heating coils
Check the connection of the emergency and operating thermo-
stats.
Sections of water/Glycol heaters, Direct evaporators
Check the condition of the heat-exchange surface.
Check the condition of the inlet and outlet piping.
Check the connection of the condensate drainage.
Check the connection and elements of the cooling circuit.
Check the condition of the drop eliminator dampers.
Plate Heat Exchanger Section
Check the condition of the exchanger vanes.
Check the bypass damper functionality.
Check the drop eliminator condition.
Check the connection of the condensate drainage.
Gas Heater Section
Check the connection of the condensate drainage.
Check the wiring and functionality of the sensors and thermostats.
Check the gas burner connection.
Check the air-venting of the gas distribution system.
Check the gas-flue connection.
Check the bypass damper functionality
Rotary Heat Exchanger Section
Check the rotor and exchanger‘s frame alignment (the frame’s
rectangularity must be ensured).
Check the rotor for free rotation.
Belt tension
Close fitting of sealing brushes
Check the motor for correct wiring.
Motor running direction
Input current of the motor (refer to the type plate)
Fan Section
Check the fan impeller for intactness and free rotation.
Check the tightening of the Taper-Lock collets.
Check the tightening of the screw joints of the fan assembly.
Check the protective covers for integrity and mounting
Check the fan impeller, inlet and outlet for cleanliness and foreign
objects
Extra for fans with a belt drive:
Check the belt tension.
Check pulley alignment
Check V belts for integrity
Until the air-handling system is adjusted, the air-handling unit can
only be put into operation when the regulating damper in the air-
handling unit inlet is closed. Operating the air-handling unit while the
air-handling system is misadjusted can cause motor overloading and
permanent damage. If the second stage of filtering is included in the
air-handling unit, it is advisable to run the testing operation with the
second stage filter inserts removed.
