Page 14 - IOM / ROOF-TOP FLEXY™ Series
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 standards 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 direction,
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™
- 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.
COMMISSIONING
Safety Test
- "Clogged filter" detection test : vary the setpoint value
(KP02 setpoint 93) in respect to the air pressure value
(KP02, variable 16). Observe the response of the
CLIMATIC™.
- Same procedure for detecting "Missing Filter" (setpoint
94) or "Air Flow Detection" (setpoint 92).
- 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 (setpoint 15 + setpoint 16).
Your machine is now operational.
You can now proceed to the setting stage. See the "Control"
section.
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