Commissioning - Lennox FLEXY FC 050 Series Installation - Operating & Maintenance Manuel

COMMISSIONING

COMMISSIONING COMMISSIONING COMMISSIONING COMMISSIONING
This work must only be carried out by trained
refrigeration engineers
Before connecting to the power:
- Ensure that the power supply between the
building and the unit meets local authority stan-
dards and that the cable specification satisfies the
start-up and operating conditions.
- Ensure that the electrical connections in the
control panel and on the motors are secure.
- Ensure that all drive motors are secure.
- Ensure that the adjustable pulley blocks are
secure and that the belt is tensioned with the
transmission correctly aligned.
- Using the electrical wiring diagram, check the
conformity of the electrical safety devices (circuit
breaker settings, presence and rating of fuses).
At this point attach the manometers to the refrigerant
circuit
Powering up the system with the unit isolating
switch
- Check the direction of rotation of the fans by
pressing their contactors. Refer to the rotation
arrows situated next to the coils or fans (NOTE:
unlike a coil, a fan rotating in the wrong direction
may fail).
- The fans' direction of rotation is checked during
an end of production test. They should therefore
all turn in either the right or wrong direction.
- If they turn in the opposite direction, disconnect
the power supply to the machine at the building's
mains switch, reverse two phases of the incoming
supply to the machine and try again.
- If only one of the fans rotates in the wrong direc-
tion, disconnect the power supply at the
machine's isolating switch and reverse two of the
component initial phases on the terminal within
the electrical panel.
Using CLIMATIC™ (06 to ON for KP02).
- Check the voltages recorded against the rated
values, in particular on the system supply fans.
- If the readings on the fans are outside the limits,
this indicates excessive air flow which will affect
the thermodynamic performance. Refer to the "Air
Flow Balancing" section.
Thermodynamic readings using manometers and
prevailing environmental conditions
- No rated values are given here. These depend on
the climatic conditions both outside and inside
the building during operation. However, an
experienced refrigeration engineer will be able to
detect any abnormal machine operation.
Page 10 - IOM / ROOF-TOP FLEXY™ Series
Safety Test
- "Clogged filter" detection test: vary the threshold
value (C89 for the KP02) in respect to the air
pressure value (V16 for KP02). Observe the
response of the CLIMATIC.
- Same procedure for detecting "Missing Filter"
(C90) or "Air Flow Detection" (C88).
- Check the smoke detection function.
- Check the Firestat by pressing the test button.
- Disconnect the circuit breakers of the capacitor
fans and check the high pressure cut-out points
on different refrigerant circuits.
Reverse Cycle Test
On reversible units this test is used to check the
switching of the 4-way valves. Start the reverse cycle
with reference to the cold or hot temperature threshold
data according to the climatic conditions at the time of
testing (C15 or C16).
Your machine is now operational.
You can now proceed to the setting stage. See the
"Control" section.