9
5.8.6 - DEFROSTING (In heating mode only)
• The control is regulated to operate as follows:
- If the temperature detected by probe S3 is less than -3
°
C (for at least 10 seconds), the machine starts de-icing (switching
of cooling cycle and stopping of fan) until the temperature read by S3 rises to +7
°
C. (However, the duration of a de-icing phase
is limited to 10 minutes. If de-icing is stopped by this time delay, alarm "r1" appears on the display).
A period of 40 minutes must pass before a new de-icing phase can start.
For special operating conditions, it may be necessary to change these settings. In this case, contact the after sales service.
NOTE: Message "d1" appears on the display during the defrosting phase.
5.8.7 - CYCLE INVERSION VALVE
• The valve is activated in cooling mode.
6 - STARTING
IMPORTANT NOTE
Before carrying out any work on the machine, make sure that it is switched off and that access to it is prevented.
Any work must be carried out by personnel qualified and authorised to work on this type of machine.
6.1 - CHECK:
• That hydraulic connections are properly tight and that the hydraulic circuit functions correctly:
- purge of circuits,
- position of valves,
- hydraulic pressure.
• That there are no leaks.
• That the machine is stable.
• That the power cables are well fixed to their connection terminals. Terminals that are poorly tightened may cause overheating
and malfunctions.
• That the electric cables are well insulated from any sections of sheet metal or metal parts which could damage them.
• That probe, control and power cables are properly separated.
• That the machine is earthed.
• That there are neither tools nor other foreign objects in the units.
6.2 - STARTING-UP THE UNIT
• Turn the water on.
• Power up the unit.
• Start the appliance (see previous paragraph).
6.3 - CHECKS TO BE MADE
• Water flow-rate.
- Note: The PMERV water output must be permanent (particular attention should be paid in the case of control of the terminal
units on 2-way valve).
• Hydraulic circuit pressures.
• Cooling circuit pressures.
• Control system operation.
IMPORTANT:
• If antifreeze is added (monopropylene glycol), a minium rate of 15% to 20% is needed to avoid any risk of corrosion.
• The LP controller (standard, factory installed) cuts off at 0.5 bar (automatic reset).
• The HP controller (accessory, not factory installed) cuts off at 29 bar (manual reset).
