HAMWORTHY HEATING LTD
12
PUREWELL
Vari
Heat c
500001169/T
Open Vented sytems
Boilers must not be capable of isolation from the vent pipe. Valves between boiler and vent pipe to be three way
type such that when boiler is isolated from vent pipe it is open to atmosphere. Safety valves should either be
mounted on the boiler by using the connection provided, or it should not be possible to isolate a safety valve
common to more than one boiler from each boiler. BS6644 provides details.
Sealed Systems
A boiler must not be capable of isolation from the individual or common safety valve. Valves between boiler and
common safety valve to be three way type such that when boiler is isolated from safety valve it is open to
atmosphere. The boiler is provided with a connection on the boiler for the safety valve .
Where using Hamworthy Heating Ltd pipework kits, assembly of these is detailed in the Instruction manual
supplied with kit.
5.3 Electrical Connections:
The following electrical connections are provided on each module on a rail at the base of the front of the boiler.
Supply: Live, Neutral and Earth. See Section 4.6 for details.
Live and Neutral connections for Shunt pump or Primary Pump
Boiler Overheat Fault Alarm Signal Output
Common Fault Alarm Signal Output
Boiler Normal Run Signal Output
Remote On/Off
0-10v Analogue Control Signal Input
External sensors
Cascade Management of Multiple Boiler Installations with Merley sequence controller.
5.0 BOILER ASSEMBLY
General
Boilers are despatched to site as fully assembled units. The flue pipe, chimney, condensate drain connection and
pipework manifold set (where applicable) are the only items that will need assembling on site.
During assembly it is important to take care to prevent damage to the boiler casing. DO NOT STAND ON THE
CASING PANELS.
Boiler positioning must allow the minimum clearances detailed in Section 3.0 to facilitate access for flue and
pipework connections as well as maintenance. Boilers can be positioned side by side, no clearance is necessary.
5.1 Flue Pipe
So as to avoid damage, the flue connecting pipe is supplied separately.
Fit the elbow to the base of the boiler and secure using the gasket and 4 - M8 nuts and washers. Moisten the lip
seal and engage the flue pipe into the elbow. Secure the flue pipe to the boiler casing using the bracket supplied.
5.2 Water Connections:
Connecting pipework must be self-supporting to avoid stress on the boiler connections. Local unions are
recommended in the pipework to facilitate future servicing requirements.
Figure 5.2.1 - Rear Water Connections
Rp1”
Safety Valve
(behind flue pipe)
Flow R2” Male thread. Indicated by a
red dot on boiler.
Return R2” Male thread. Indicated
by a blue dot on boiler.
Gas R1” Male thread.
Condense 32mm dia. Male plain. Offset
and below return connection.
Summary of Contents for Purewell VariHeat 70c
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