INSTALLATION, OPERATION AND MAINTENANCE MANUAL
FW cooling only range – Monosplit single-phase
Caution: the use of a manual that is not up to date with the condensing unit version does not
engage the responsibility of LTB
11 USE : UNIT START-UP
This paragraph applies to both the first start-up and the post-intervention startups.
The intervention must be carried out by a person with the appropriate skills and qualifications.
In particular, it must have the certificate of suitability for the handling of refrigerants. In addition,
the company employing this person must have a certificate of ability.
Before starting up the unit, you must:
Check the electrical connections are well tightened.
Check the CU is well evened.
Check the IU is well evened and that the condensate drain is well connected.
Check that the power supply voltage at terminals L and N of the CU is correct.
Check that the flare valves are open.
Check that the CU is well supplied with water.
The start of the installation is done via the IU. When the IU is in cooling demand, it sends the starting
instructions to the CU’s compressor. The compressor will start and will circulate the fluid.
There is a waiting time of up to 3 minutes for CUs without the LP pressure switch option and up to 9 minutes
for CUs with the LP pressure switch option between a cooling demand made via the remote control and the
compressor start.
The CU is equipped with the following security features:
HP pressure switch: it stops the compressor when the pressure is higher than 28 bar. Its reset is
automatic (turn off the UI and turn it back on).
BP pressure switch (option): it stops the compressor when the pressure is less than 0.5 bar. When the
pressure rises above 1.5 bar, the pressure switch closes automatically and the compressor starts
again after a 5 minute short cycle time delay (T1). It should be noted that the T2 delay allows this
safety to be shunted during the first 5 minutes of compressor start-up.
It is important to carry out complete operational tests during commissioning and to
record the measurements on the commissioning sheet (provided with this
documentation). The same tests must also be carried out during the maintenance phases
and any troubleshooting interventions.
A complete test must include at least the following measures:
Temperature measurement of HP, LP, compressor discharge, liquid, compressor suction.
Temperature measurement of the water in- and outlet.
Measurement of the current absorbed by the compressor and the IU.
The commissioning form must be completed and returned. The receipt by LTB of this
correctly completed form determines the warranty validation.
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