Innova Stone Monoblock M1, Руководство по установке, Страница: 51 / 72

51
PUTTING IT INTO SERVICE
If higher heads are required due to high pressure drops in
the plant, add an external pump with a relative buffer vessel.
Presence of air
Check that no air pockets are still present once the electri-
cal connections have been established and the circulation
pump has been switched on.
In the presence of air pockets:
• stop the pump several times
• vent again
To avoid dangerous cavitation that could damage the
pump and make the entire appliance less efficient, the
suction pressure, with the pump on, measured by the
pressure gauge on the appliance, must not be less than
0.6 bar.
3�4 PP1 primary circulation pump
The appliance uses a high-efficiency wet circulation pump,
suitable for all heating and air-conditioning plants.
On the front of the pump body there is a regulator for select
operating mode at fixed or variable speed:
Fixed speed mode must be used for the primary
pump.
Fixed speed mode
In this mode, the circulation pump operates at fixed speeds
that are not subject to regulation. For operating curves (avail-
able at maximum speed) see chapter "PP1 primary circulation
pump graphs"
p. 68 .
The unit is supplied with the selector set to maximum
speed.
1�
Minimum speed
2�
Medium speed
3�
Maximum speed
1 2 3
3�5 Plant delivery
Once all the checks and controls on the correct operation
of the plant have been completed, the installer must explain
the following to the user: • the basic functional characteristics of the appliance
• the instructions for use
• the routine maintenance
3�6 Long period shut-down
The following operations must be carried out if the air-to-wa-
ter heat pump is not used for a long time:
– disable the device
– turn the master switch of the appliance to position 0-, OFF.
After switching off the appliance:
– switch off the indoor terminal units by setting the switch
of each appliance to the "off" position
– set the main system switch to "Off"
– close the water taps
Contact the Technical Service Centre.
If the outside temperature may fall below zero degrees
centigrade, with the likelihood of frost, the hydraulic plant
must be drained or antifreeze liquid (e.g. ethylene glycol)
must be added in the doses recommended by the man-
ufacturer.
To restart the heat pump after it has been out of operation for
a long time, contact the Service Centre.
3�7 Draining the plant
The appliances are not equipped with a drain cock, it is nec-
essary to provide one on a pipe connecting to the plant at a
point near and below the appliance.
Preliminary warnings
All operations must be carried out with the machine
stopped and disconnected from the power supply.
Draining
Before starting the emptying operation:
– check that the plant water filling/top-up cock is closed
To drain the plant:
– open the drain cock on the outside of the appliance
– open all the air valves of the plant and its terminals