Technical data

TECHNICAL AND INSTALLATION

Wiring the thermostat:

To comply with ‘The Building Regulation 1991 G3.6’ the manual reset high limit thermostat must be

wired to a self-closing motorised valve or some other suitable device to shut off the primary flow to the

cylinder.

The thermostatic controller should be used to regulate the temperature of the tank by controlling the

heating pump or zone valve supplying the unit (note that a spring return valve must be connected to the

high limit stat for normal operation, i.e. the valve will be energised to open by the thermostat and then

spring closed when the circuit is broken). The switch wire from the pump or valve can be wired to the

tank controls via the 6 pin plug. See diagram below.

Thermostat wiring schematic.

Factory Wired Installer Wired

High Limit Stat

Thermostat

Please note N is a switched LIVE not NEUTRAL.

(Typical ‘S & Y-plan’ wiring schematics are on pages 12 &13).

ACV recommend that the cylinder is electrically cross bonded to earth.

Primary system connections:

The primary flow and return connections to the tank should be made using the appropriate sized fittings

with a male BSP component that will allow the disconnection and removal of the unit. A self-closing

motorised valve or some other suitable device must be fitted to shut off the primary flow to the cylinder.

Care must be taken to ensure that the connections are watertight to avoid any leakage that may go

undetected and cause external corrosion damage to the tank.

Distribution Pressure

The mains water supply must be fed to the unit via the supplied mains kit, this will maintain a

maximum distribution pressure of 3.5 Bar.

Purging

After filling and before using it will be necessary to purge air from both the primary (heating) and

secondary (domestic) tanks. The domestic can be purged by opening a hot outlet at the highest

point (or by venting the temperature and pressure relief valve), the primary (heating) tank can be

vented using the air vent located on the top of the tank (ensure vent is tightened after use).