11
INSTALLATION - INDIRECT UNITS
PLUMBING CONNECTIONS
POTTERTON GOLD indirect cylinders require the
following
pipework connections.
•
Cold water supply to and from inlet controls.
•
Outlet to hot water draw off points.
•
Discharge pipework from valve outlets to
tundish
•
Connection to the primary circuit.
All connections are 22mm compression. However,
3/4”BSP parallel threaded fittings can be fitted to
the primary coil connections if required.
ELECTRICAL SU
PPLY ( FIG. 7 Page 10 )
All units are fitted with a 3kW immersion heater
and a combined thermostat and thermal cut-out to
control the indirect heating source.
The POTTERTON
GOLD cylinder MUST be earthed.
All wiring to the unit must be installed in accordance
with the latest IEE Wiring Regulations and the
supply circuits must be protected by a suitable fuse
and double pole isolating switch with a contact
separation of at least 3mm in both poles. All
connections are made to the terminal block located
under the terminal cover mounted on the side of the
unit. The supply cable(s) must be routed through the
cable grip(s) in the terminal housing.
DISCONNECT FROM MAINS SUPPLY BEFORE
REMOVING ANY COVERS. DO NOT
BYPASS THE
THERMAL CUT-OUTS IN ANY CIRCUMSTANCES.
Ensure the thermostat and thermal cut-out sensing
bulbs are pushed fully into the pockets on the
element plate assembly.
BOILER SELECTION
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 POTTERTON GOLD cylinder
should not exceed 2.5m.
PRIMARY CIRCUIT CONTROL
The 2 port motorised valve supplied with the
POTTERTON GOLD cylinder MUST be fitted on the
primary flow to the POTTERTON GOLD cylinder
heat exchanger and wired in series with the indirect
thermostat and thermal cut-out fitted to the unit.
Primary circulation to the POTTERTON GOLD
cylinder heat exchanger must be pumped; gravity
circulation
WILL NOT WORK
.
SPACE AND HEATING SYSTEMS CONTROLS
The controls provided with the POTTERTON GOLD
cylinder will ensure the safe operation of the unit
within the central heating system. Other controls
will be necessary to control the space heating
requirements and times that the system is required
to function. (See Fig. 7 Page 10)
The POTTERTON GOLD cylinder is compatible
with most
heating controls, examples of electrical
circuits are shown in Figs. 8 and 9 ( Page 12 ).
However, other systems may be suitable, refer to
the controls manufacturers’ instructions, supplied
with the controls selected, for alternative system
wiring schemes.
