Lennox ASC Series Installation, Operating And Maintenance Manual page 28

3. COMMISSIONING AND OPERATION
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.
ASTP Protection is included with the unit compressors. See "Fault diagnosis" for more information.
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 1/4 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.
The unit must be installed in accordance with local safety
codes andregulations and can only be used in a well
ventilated area. Please readcarefully the manufacturer's
instructions before starting this unit
All work on the unit must be carried out by a qualifi ed and
authorised employee.
Non-compliance with the following instructions may result in injury
or serious accidents.
Work on the unit:
The unit shall be isolated from the electrical supply by disconnection
and locking using the main isolating switch. Workers shall wear
the appropriate personal protective equipment (helmet, gloves,
glasses,etc.).
Electrical system:
Electrical connections can become loose during transport. Please
check them before starting-up the unit Compressors with specifi c
rotation direction. Check the correct rotation direction of the fan
before closing the compressor circuit breakers. If the direction is
incorrect, the phases must be reversed at the head of the main
switch. Work on electric components shall be performed with
the power off (see below) by employees having valid electrical
qualifi cation and authorisation.
Refrigerating circuit(s):
After more than 12 hours of power cut, the cranckcase heater
(compressor) should be powered for 5 hours before any return
to service. Non-compliance with this instruction can cause
deterioration of the compressors.
Monitoring of the pressures, draining and fi lling of the system under
pressure shall be carried out using connections provided for this
purpose and suitable equipment.
• 27 •
To prevent the risk of explosion due to spraying of coolant and oil,
the relevant circuit shall be drained and at zero pressure before
any disassembly or unbrazing of the refrigerating parts takes place.
There is a residual risk of pressure build-up by degassing the oil or
by heating the exchangers after the circuit has been drained. Zero
pressure shall be maintained by venting the drain connection to
the atmosphere on the low pressure side.
The brazing shall be carried out by a qualifi ed brazier. The brazing
shall comply according to code ASME section IX following the
procedures specifi c.
Before starting up
- Test the circuit to the maximum working pressure(see the
nameplate)
- Verifi fy the operation of the high pressure swich.
- Check the piping and the components of the refrigerant circuit.
Replacing components:
In order to maintain CE marking compliance, replacement of
components shall be carried out
using spare parts, or using parts approved by Lennox.
Only the coolant shown on the manufacturer's nameplate shall be
used, to the exclusion of all other
products (mix of coolants, hydrocarbons, etc.).
CAUTION:
In the event of fi re, refrigerating
circuits can cause an explosion
and spray coolant gas and oil.
Installation, Operation and Maintenance manual • ASC/ASH-MIL152E-1217-01/2019