Lennox FLATAIR FIC-H, Installation, Operating And Maintanance Manual, Page: 23 / 32

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3.- COMMISSIONING AND OPERATION
Check that drain pipe connections and their fixtures are secure and that the level of the unit is tipped toward the
drain.
Inspect the state of the ducts and grilles 8clean and open grilles, no breaks in the duct, etc.)
Check that the power supply is the same as stated on the firm plate which is in agreement with the electrical
diagram for the unit and that cable sizes are correct. Check that tightness of the electrical connections to their
terminals and to ground.
Inspect the air filter, which should be in its housing and correctly positioned (the metal grille should be toward the
inside)
Check with your hand that the fans turn freely.
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2.
3.
4.
5.
3..- PRELIMINARY CHECKS
OUTDOOR SECTION
INDOOR SECTION
Air filter
Return air duct
Supply air duct
Fan access
Drain pipe
Outdoor discharge duct
Outdoor air inlet duct
Flexible joint at openings
Power supply
Trap
Trap
3.2.- PRELIMINARY CHECKS AT STARTUP
To start the unit, follow the instructions given in the User Manual for the control supplied with the unit
(requiring operation in any of the modes, cooling, heating, or automatic).
After a time delay, the unit will start.
With the unit operating, check that the
fans are turning freely and in the correct direction.
CHECK THAT THE COMPRESSOR IS ROTATING IN THE CORRECT DIRECTION.
- If you have the option phase rotation indicator, use it to check the correct rotation.
- If you do not have three phase return lock, check the correct direction of rotation. The suction pressure decreases and the discharge
pressure increases when the compressor is started.
- If the connection is incorrect, rotation will be reversed, causing a high noise level and a reduction in the amount of current consumed.
If this occurs, the compressor’s internal protection system will operate to shut down the unit. The solution is to disconnect, reverse
two of the phases and connect again.
WITH OPERATING UNIT, CHECK:
- Low pressure and high pressure.
- Use the evaporating and liquid temperature to calculate superheat and subcooling.
- Adjust the refrigerant charge and/or expansion valve according to the preceding values.
COMPRESSOR OIL LEVEL
The oil level must always be checked. When the compressor is at rest, the level should be between /4 and 3/4
in the sight glass, while when running the level should be between 3/4 and full.
In the event of having to add oil, remember the type of oil is synthetic POE.
The original oil charge in the compressor is ICI Emkarate RL32-3MAF. This type of oil must also be used when replacing the oil
completely.
When only topping up, RL32-3MAF or Mobil EAC Artic 22C can be used.