Accessories And Options; Unvented System Kit; Expansion Module; Return Sensor Kit - andrews MAXXflo EVO Lite Installation And Maintenance Manual

4.6 Accessories and options

4 Description of the product

4.6.1 Unvented system kit

Designed to complement the heaters performance it enables the
heater to be connected directly to the cold water supply and is suitable
for an average sized pipework system. The kit (part number 7799195)
contains the following items:
• Cold water inlet control valve (set to 3.5 bar with 6.0 PRV)
• 24 ltr Expansion vessel and wall fi xings
• Continuous circulation valve (Anti-legionella device that prevents
the expansion vessel becoming a dead leg)

4.6.2 Expansion module

This expansion module can be used to add additional functions to the
heater and its system (for example adding the 300 litre buff er tank). A
module consists of:
• 3 freely confi gured relay outputs
• 2 freely confi gured temperature sensor inputs
• 1 multipurpose input
The module kit (part number 7720070) is available from Andrews Wa-
ter Heaters.

4.6.3 Return sensor kit

This strap-on temperature sensor kit is designed for mounting onto the
DHW return pipe to acquire the temperature of the water fl owing in-
side. The strap-on sensor consists of a plastic housing with a snap on
cover and can be connected to a pipe having a diameter of between
15 mm and 100 mm. The Return sensor kit (part number 7720071) is
available from Andrews Water Heaters.
4.6.4 Modbus communication module
Device used to enable direct two way communication with a Building
Management system. This device plugs directly into the heater control
PCB and translates the internal boiler protocol language into Modbus.
The module kit (part number 7720069) is available from Andrews Wa-
ter Heaters.
20 MAXXfl o EVO Lite