MSAT 102-122-142-162-182-202-242

START-UP
ALL THE EQUIPMENT MUST BE STARTED BY AUTHORISED SERVICE CENTRES, IN ORDER TO VALIDATE THE
CONTRACTUAL WARRANTY. THIS SERVICE ONLY INVOLVES THE START-UP OF THE SYSTEM AND NOT THE
CONNECTIONS OR ANY OTHER WORK ON THE SYSTEM.
PRELIMINARY CHECKS
- Check that the unit is correctly positioned and that the connections to the indoor terminal unit have been performed
correctly on the refrigerating side and the electrical side.
- Check the mains voltage and frequency values:
THESE MUST FALL WITHIN THE FOLLOWING VALUES
230 ± 6% 400 ± 6%
- Check that the screws fastening the wires to the electrical components in the panel are tight (vibrations during handling
and transport may have caused these to loosen).
EMPTYING
After having checked, with the system under pressure, that there are no leaks (see the section on the refrigerant pipes),
both in the connection pipes and the terminal unit, proceed as follows.
- Empty the system with the MSAT valves always closed.
- With the help of a pressure gauge, connect the vacuum pump to both fittings on the valves, making sure that any on-off
devices (solenoid valves or cocks) are open, and then empty the system.
- To ensure that the solenoid valve remains open, disconnect it from the terminals on the outdoor unit electrical panel
(see the wiring diagram) and connect to a normal 220V outlet.
- Stop the pump at a pressure of around 100Pa and leave the system in this condition for a few hours; a small initial rise
in pressure is normal, after which it will stabilise. If the pressure continues to rise it means there are small leaks or
moisture in the system. In the former case, repeat the operations described in the paragraph CHECKING FOR LEAKS in
the refrigerant pipe manual. In the latter case, recharge the system with refrigerant to 100KPa and then repeat the
emptying procedure, as described above. Once the pressure has stabilised, proceed to the subsequent charging phase.
REFRIGERANT CHARGE
The sizes in question are delivered with a refrigerant charge to be completed during start-up, according to the type of the
indoor terminal unit and the layout of the pipes.
- With the system empty, close the valves on the pressure gauge assembly and disconnect the vacuum pump.
- Connect the bottle of refrigerant gas, venting the air in the pressure gauge assembly connection hose.
- Open the valves on the pressure gauge assembly, introducing refrigerant in the gaseous state until there is equilibrium
in the system / bottle pressure, and in any case at a pressure above atmospheric pressure.
- Open the valves on the condensing units (the liquid valve first) to prepare the unit for operation.
We recommend to use a square-section wrench of the same size as the valve
stem and with a lever arm long enough to exert the necessary force.
( * SEE FIGURE )
Weight of refrigerant in the lines during operation (KG / 10m)
Pipe OD Liquid
at 38°C
Intake
SST+4.5°C
10 0,60 --
12 1,06 --
14 1,41 0,025
16 1,71 0,030
18 2,36 0,043
22 3,62 0,070
28 6,61 0,120
35 9,47 0,195
42 -- 0,290
OUTDOOR UNIT
Gas valve
Liquid valve
INDOOR UNIT
IMPORTANT:
When starting the unit for the first time and after each period of extended shutdown, the compressor crankcase oil
heating elements (if present) MUST be powered for at least 8 hours before starting the compressor.
The start-up operations are performed in the following order:
- Switch the isolating switch QS1 on the condensing unit, making sure that the green LED is off.
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