12 WSAN-XIN
18.2-45.2
M0M140L15-01
4.10 Operation sequence
Close all vent valves in the high points of the unit hydraulic circuit
Close all drain valves in the low points of the unit hydraulic circuit:
t
Heat exchangers
t
Pumps
t
collectors
t
storage tank
t
free-cooling coil
1. Carefully wash the system with clean water: fill and drain the system several times.
2. Apply additives to prevent corrosion, fouling, formation of mud and algae.
3. Fill the plant
4. Execute leakage test.
5. Isolate the pipes to avoid heat dispersions and formation of condensate.
6. Leave various point of service free (wells, vent-holes etc).
Neglecting the washing will lead to several filter cleaning interventions and at worst cases can cause damages to the exchangers and the
other parts.
4.11 Partial energy recovery
Option
A configuration which enables the production of hot water free-of-charge while operating in the cooling mode, thanks to the partial recovery
of condensation heat that would otherwise be rejected to the external heat source.
The partial recovery device is considered in operation when it is fed with the flow of water to be heated.
When the temperature of the water to be heated is particularly low, it is wise to insert a flow control valve into the system water circuit, in
order to maintain the temperature at the recovery output at above 35°C and thus avoid the condensation of the refrigerant into the partial
energy recovery device.
The recovery exchanger must be always maintained full of water
The lack of water amplifies the noise generated by the operation
UNIT
QAB
QB
QB
QA
QAB
V
M
4.12 hydronic assembly
For details see:
9 Accessories p. 43
