Lennox FWCK Installation, Operating And Maintenance Manual page 13

INSTALLATION
• All installation must be carried out by qualified personnel.
Make sure to disconnect power supply before carrying out any type of work on the unit.
Hydraulic circuit:
• Make sure that water connections are correct, water inlet (upper side), water outlet (down side).
Water filter in the inlet water connection has to be used. The step of the mesh should be less than
Lennox offers this element as an option.
• Install cut off valves at inlet and outlet water connections, because of in case of repairs, the hydraulic circuit can be independent.
Use flexible components for the hydraulic connection between the unit and the installation in order to
prevent the transmission of vibrations.
• Install water inlet and water outlet connections with a differential gauge device in order to see the pressure difference between
the outlet an inlet connections.
• At the end Install an adequate water pump, and all the necessary elements for the installation
Air flow:
• All models include three fan speed motor fan, except for FWCK/FWHK 22 models. The transmission for this model is
done through pulleys and belts.
• Make the motor fan connections for the fan speed required and adjust the pulley for FWCK/FWHK 22 models in order
to adequate the air flow needed for the installation.
Drainage tube:
• Use the flexible tube connected to the drip tray as a drainage tube. Cause a siphon with this tube in
order to avoid the inlet of scents from the installation to the unit.
Install a siphon from the drainage tube of the drip tray with a difference in height of 80 mm to prevent from
not evacuating due to the negative pressure created by the fans. The pipe will slope down 2% to make it
easier for the condensates to drain off.
Installation:
• After supply the power to the unit and connect inlet/outlet water:
- Connect the gauges in high pressure and low pressure side.
- Use a temperature probe in the compressor gas pipe and another ones in the inlet and outlet water pipes.
- Start water pump.
- Make sure to close the unit all panels have to be correctly situated.
- Start the unit and make sure that the thermostat temperature adjustment is correct.
- Check the correct water flow with a differential gauge device connected between the inlet and outlet water connections
in order to know the pressure difference. Check it according to the capacity table values.
In addition, you can know the correct water flow with ∆t measurement (inlet temperature ºC - outlet temperature ºC).
This value has to be the same as the value calculated with this formula:
a) Cooling mode
[Cooling capacity (kW) + Total power input (kW)] x 860
∆t =
All the data water flow, cooling / heating capacity and power input are on the capacity tables according to each model
and the working conditions.
• After a few minutes, when the unit will be stabilised, you have to verify:
- High and low pressure values and in addition saturation temperatures according to the correct working mode of the
unit.
- Gas reheating values are below 12ºC.
If it is not correct, please check expansion system and refrigerant leaks.
If the compressor noise is very high and in addition, high and low pressure values are similar, it can
be possible a wrong phase electrical connection. In this case, please change the connection for two
phases.
- Outlet and inlet water temperature are correct according to the water flow which is between specified values.
• After verify the correct working mode, please stop the unit, disconnect the gauges and temperature probes. and clean water
filter.
The unit can be work properly until next maintenance revision.
A 0.5 mm which avoids welded and dirty get to the unit.
Water flow (l/h)
b) Heating mode
[Heating capacity (kW) - Total power input (kW)] x 860
∆t =
12
Min. 80 mm.
2%
Inspection and
cleaning stopper.
Water flow (l/h)