Heatrae Sadia Megaflo Eco 125DD, Manual

Page: 13 / 40

13
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
assembly must be fitted on the mains
water supply to the cylinder.
`
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.
Refer to the installation schematic (Fig 3, page 9) for
details on the pipework layout. Specific details for the
discharge pipework layout is also provided in Figure 11
on page 18.
6. Installation
6.1 General
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.
Boiler selection (Indirect units only)
`
The boiler should have a control thermostat and non
self-resetting thermal cut-out and be compatible
with unvented storage water heaters.
`
Where use of a boiler without a thermal cut-out
is unavoidable a “low head” open vented primary
circuit should be used. The feed and expansion
cistern head above the cylinder should not exceed
2.5m.
`
Can be a sealed system or open vented type -
maximum primary pressure 10 bar.
`
The boiler cannot be vented through the cylinder.
Figure 6: Pressure Reducing Valve
Figure 7: Expansion (Pressure Relief) Valve
Outlet to Megaflo Eco
Mains in
22mm compression connection
Take note of flow
direction
Pressure Reducing Valve
Cartridge (3 bar)
22mm compression connection
Outlet to Megaflo Eco
From cold water
combination valve
T
ake note of flow
direction
Pressure Relief Valve
discharge connection
Pressure Relief Valve
“TEE” ( incorporates
Check Valve )