NW Global Vending – TECHNICAL MANUAL
This document was produced by MARK AC for the exclusive use of the technical personnel in the after-sales service.
. No part of this document may be divulged to a third party or reproduced partially or entirely without the prior permission of NW GLOBAL VENDING
. All rights reserved.
New dispenser “KORO”
07/10/2005
page 27 / 42
20 – PUMPS AND BY-PASS
In order to supply water to the espresso boiler a vibration pump used, which is the same used in the entire
H&C
range of Necta.
The application is specific, as pump, boiler, TRIAC circuit and connections are positioned inside the espresso
module and easily accessible after opening the compartment wall, closed by only two screws and a quick snap
fastener (see Page 16)
This solution ensures maximum access for maintenance and hygiene, it also allows the option of using
configurations with two espresso modules as an alternative to other two modules, and even mixed modules
espresso/instant/fresh-brew.
The pump has overheating protection in case of continuous or dry operation by means of a 90°C self-reset
klixon. It is fitted with a by-pass at the outlet to ensure correct and consistent dispensing pressure.
The by-pass is factory pre-set at
12 bar
.
The pump is activated by
relay K 8 (
see previous page for the pictures).)
The pump is located in the espresso boiler unit.
In the event of malfunctions the pump can be
replaced with a new one.
In order to access to it, the brewer unit must be
removed (Fig. 1).
Therefore the boiler unit protective casing must be
opened (Fig. 2) undoing the two fastening screws.
The PUMP is located on the left-hand side and is
mounted on two rubber anti-vibration elastic supports.
Disconnect the connection cables and remove after
undoing the special screws.
NEVER change the setting of the bypass, especially
adjusted at the factory, if the malfunction is due to
clogging from calcium deposits; replace with the
complete check-valve spare part set.
If the malfunction was due to triggering of the klixon,
replace it with an identical one.
POMPA
Klixon
Overheating
protection
BY PASS
CHECK-VALVE
WATER INLET
PUMP REMOVED FROM THE BOILER UNIT
