Issue 1 06/02/20
19
Installation
6
After reading the previous sections in this booklet and choosing
a good location for the unit please install, paying attention to the
following hydraulic, electrical and commissioning sections.
6.1.1 Heat Source selection
• The Heat Source should have a control thermostat and non
self-resetting thermal cut-out and be compatible with
unvented storage water heaters.
• The Primary Circuit from the Heat Source can be a sealed
system or open vented type - maximum primary pressure 25
bar.
• The Heat Source cannot be vented through the cylinder.
6 Installation
6.1 General
• All pipe fittings are made via BSP pipe connections directly
to the unit.
• A stopcock or servicing valve should be incorporated into the
cold water supply to enable the cylinder and its associated
controls to be isolated and serviced (not supplied).
• The expansion vessel must be connected between the cold
water combination valve and the cylinder.
• The location of the expansion vessel should allow access to
recharge the pressure as and when necessary.
• A suitable draining tap should be installed in the cold water
supply to the cylinder between the expansion valve and the
heater at as low a level as possible.
• It is recommended that the outlet point of the drain pipework
be at least 1 metre below the level of the heater (this can be
achieved by attaching a hose to the drain tap outlet spigot).
6.2 Water Connections
Warning
• Under no circumstances should the factory fitted
temperature/pressure relief valve be removed other
than by a competent person. To do so will invalidate
any guarantee or claim.
• The cold water combination valve is part of the
unvented kit and MUST be installed in accordance
with G3 Building regulations.
• No control or safety valves should be tampered with
or used for any other purpose.
• The discharge pipe should not be blocked or used
for any other purpose.
• The tundish should not be located adjacent to any
electrical components.
See
Refer to the installation schematic Fig. 10, page 20 for
details on the pipework layout.
Specific details for the discharge pipework layout is also
provided in Fig. 13 on page 25.
