Tightening Torques For The Main Electrical Connections; Tightening Torques For The Main Bolts And Screws; Air Heat Exchanger - Riello NexPolar Series Installation And Technical Service Instructions

— The modification of the parameters set at the factory (appli-
cation changes),
— The removal or disassembly of the HVAC unit,
— Any intervention resulting from a scheduled maintenance in-
tervention that was not performed.
— Any interventions covered by warranty.
— One or two leak checks per year, performed by a qualified
person using a certified leak detector.
In order to reduce waste, the refrigerant and the oil must be com-
pliant with the current regulations, and the relative usage methods
must limit the refrigerant and load losses, and must be carried out
using materials suitable for the products.
5.2

Tightening torques for the main electrical connections

Component
Disconnecting switch (option 70)
Terminal block XI
Terminal block X3
Contactor (power and control)
Thermal relay
Transformer
Connections on the compressor
Phase wire screw (only for 21kW)
Compressor speed variator
six M10 nuts
two M10 or M8 nuts
9 M8 nuts (with fuses and bars)
5.3

Tightening torques for the main bolts and screws

Screw type
H M8 wood screw
H M8 nut
Self tapping screw D=4.2mm
Self tapping screw D=3mm
M6 Self tapping screw
M8 screw
D1" and D1"1/4" gas nut
D1/2" gas nut
H M6 nut
5.4

Air heat exchanger

It is recommended to regularly inspect the finned coils in order to
check their level of cleanliness. This depends on the environment
in which the unit is installed, and the conditions will be worse in
industrial and urban environments, and around deciduous trees.
Two levels of maintenance are required in order to clean the finned
coil:
— If the air heat exchangers are clogged, use a brush to gently
clean them in a vertical direction.
— The fan must be off when working on the air heat exchangers.
— The unit should be shut off for this type of operation if deemed
necessary, taking into account all the appropriate mainte-
nance considerations.
— Clean the air heat exchangers in order to ensure the unit's
optimal operation. This cleaning operation is required once
the air heat exchangers start to get dirty. The frequency of the
Designation of the unit
L1 /L2 /L3/N/PE
L1 /L2 /L3/N/PE
L1 /L2 /L3/N
PE
01/02/03
Use
Frame mounting on the pallet
Fastening of the compressor onto the base and BPHE and
receiver fastening
Sheet metal parts, plastic grille and electrical components
Installation of the deflector on the front panel
Fan sub-unit and installation of the frame on the feet
Water pump on divider panel assembly
Heat pump pipe unit intake and delivery
Water filling system and unit nut on water pump suction
pipe
Fan blade unit on fan motor
Any faults and leaks detected must be immediately repaired. The oil
recovered from the compressor during maintenance activities con-
tains refrigerant, and must be handled accordingly.
The pressurized refrigerant must never be discharged into the open
air.
If a cooling circuit is opened, plug all the openings if the operation
is expected to last up to one full day; for longer periods, fill the cir-
cuit with nitrogen.
NoTE: Any deviations or failures to observe these maintenance cri-
teria will nullify the HVAC unit's warranty conditions, thus absolving
the manufacturer of any responsibility.
Value (Nm)
2,00
1,5 - 1,8
0,6 - 0,8
1,50
2,50
1,70
2,50
1,20
1,20
1,20
cleaning operations depends on the season and the unit's lo-
cation (presence of wind, dust, plants, etc.).
Clean the finned coil with appropriate products.
9
Never use pressurized water without a large diffuser attach-
ment. Never use high-pressure detergents for Cu/Cu and Cu/
Al coils.
Concentrated or rotating jets of water are strictly prohibited. Never
use liquids with temperatures greater than 45° C to clean the air
heat exchangers.
2/3 of corrosion problems can be prevented with proper and fre-
quent cleaning (approximately every three months).
55
MAINTENANCE
Value (Nm)
13,00
15,00
4,20
2,00
7,00
15,00
70,00
20,00
7,00