Heat Recovery Wheel; Plate Heat Exchanger; Steam Humidifier - Carrier AiroVision 39 HQ Assembly/Installation, Commissioning, Maintenance Manual

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- After a period of time, check whether condensate
is being drained and plastic siphon is operating. If
required, clean the siphon.

10.12. Heat Recovery Wheel

- Check that the wheel is rotating in the correct di-
rection. This is indicated by an arrow on the cas-
ing.
- Check whether rotary seals are fitted correctly.
- Check whether belt tension is sufficient.
- Check whether motor and control panel, if pre-
sent, is correctly connected.
- If present, check whether Check if the controller
has been correctly connected and set in accord-
ance with the instructions of the supplier.
- Check whether rotor speed has been set correctly.
- The following warning is attached to the panel: ro-
tating parts
- When making rotary inverter connection, use the
cable supplied by the factory, see Fig. 56.
Fig. 56.

10.13. Plate Heat Exchanger

For plate heat exchangers with bypass dampers:
- Check whether damper motor has been installed
in accordance with the instructions of the supplier.
- Check whether the correct angle has been set.
- Check whether dampers close correctly.
- Check whether damper is opening at correct posi-
tion.
- Check operation after the power has been restored
following a power cut. Some dampers should be
open while others are closed.
- Straighten the fins is they are bent during trans-
port.
- Check whether siphon has been correctly installed
and check whether siphon cap and ball have been
properly placed.

10.14. Steam Humidifier

- Check fixing of steam pipe.
- Check steam supply and condensate drain pipes.
- For longer pipes install an extra drain pan in ac-
cordance with the instructions of the supplier.
- Check whether the dirt trap has been installed.
- Humidifier duct should left without pressure in
accordance with the manufacturer's instructions.
Refer to supplier instructions.
- If humidifier cell has negative pressure, install a
special siphon to humidifier cell.
- Before starting up the steam humidifier, steam
must be introduced slowly into the system to
provide correct operation temperature of the hu-
midifier. Once the condensate pipe reaches to
operation temperature, start the actuator motor
electrically or pneumatically and set the desired
humidity level. Observe supplier instructions for all
of these processes.
- A few days after starting up the unit, clean the
strainer of dirt trap and check the status of humidi-
fication duct. For casings with negative pressure,
operation of the negative pressure system should
be controlled with a check valve.
- Steam humidifier should be closed at least 2 min-
utes before air handling unit is turned off.
- The following warning is attached to the panel: hot
surface
10.15. Electric Steam Humidifier