Marco FRIIA 1000860 Series, Service Manual

Page: 30 / 46

FRIIA Service manual Page 30
Carbonator NRV cleaning and replacement (CO2 in cold still water)
Sporadically, dust or iron particles may be present in the pipes or coils of the chiller or may
come from the outer tubes during the first installation or during maintenance operations to
external filters. In the case of leakage from NRV (CO2 in cold still water), the NRV should
be removed checked and cleaned.
Please ensure the CO2 is disconnected and purged from the machine.
This can be done removing the internal top bracket sub-assembly with all components, as
described previously, giving access to the carbonator.
Identify the two NRV; the CO2 NRV (a) is the one directly connected to the CO2 inlet; the
water inlet NRV (b) is the one connected to the alublock coil.
Undo the hydraulic connection on the inlet of the NRV (b) and with a spanner remove the
body of NRV.
During removal, be careful not to damage the plunger and threads and note the assembly
orientation of the internal components.
Inspect for damage and/or residuals on the plunger spring (c) and on the seal (d). Replace
the plunger if needed.
For reassembly, repeat the same operations in reverse order
.
a
b
c
d