Everflo EDS120, Руководство по установке

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06
EVERFLO STAINLESS uV
uNVENTEd HOT WATER CyLINdERS
BALANCEd COLd CONNECTION
If there are to be showers, bidets or monobloc taps in the
installation then a balanced cold supply is necessary. There is a
22mm balanced connection on the inlet set.
HOT WATER PIPEWORK
Run the first part of the hot water distribution pipework in 22mm.
This can be reduced to 15mm and 10mm as appropriate for the
type of tap etc. your aim should be to reduce the volume of the
hot draw-off pipework to a practical minimum so that the time
taken for the hot water is as quick as possible. Where monobloc
mixing taps and showers are used, these should be installed to
comply with the Water Supply (Water Fittings) Regulations 1999.
If these devices are supplied with un-balanced supplies there
should be single check valves installed at both inlets, to stop over
pressurising of either supply.
PRIMARy COIL CONNECTIONS FOR INdIRECT uNITS
For Solar input models refer to pages 13-14 before making any
connections.
Connect the primary connections (Indirect only) using the
compression connections provided. The primary circuit must
be positively pumped. Gravity circulation is not suitable. Either
primary connection may be used as the primary flow, reheat times
are not effected. The primary circuit can be open vented or sealed,
with up to a maximum pressure of 3.5 bar. If you seal the primary
circuit an additional expansion vessel and safety valve is required.
The boiler may be Gas, Electric or Oil but must be under effective
thermostatic control. uncontrolled heat sources such as some
AGA’s, back boilers, solid fuel stoves, etc. are NOT SuITABLE. Please
contact our Technical department for guidance. Connect the two
port zone valve ( indirect only ) into the primary flow pipework.
The direction of flow arrow should be towards the primary flow
connection.
SECONdARy CIRCuLATION
EVERFLO STAINLESS uV can be used with secondary circulation.
An appropriate WRAS approved bronze circulator should be
used in conjunction with a non-return valve to prevent backflow.
On large secondary circulation systems it may be necessary
to incorporate an extra expansion vessel into the circuit to
accommodate the increased system water volume. Secondary
circulation should be avoided on direct electrically heated units
being used on off-peak electricity tariffs.
A secondary return boss is fitted as standard on 210, 250 & 300 ltr
units. On smaller sizes, tee into the cold feed pipe above the drain.
IMMERSION HEATERS
Only immersion heaters with a thermal cut-out may be used. To
help ensure this, the immersion heaters have a special 1¾” thread.
They are rated at 3kW at 240V and are of a low noise Incoloy
construction.
They have both a thermostat and a high limit cutout. Please order
the correct replacement via ourselves; fitting non-approved
immersions may affect your guarantee. When fitting, ensure the
‘O’ ring is positioned correctly on the head of the immersion
heater and lubricate before fitting. Fit it by hand until almost
home then tighten gently as the ‘O’ rings will seal easily. The
electrical supply to each immersion heater must be fused at 13A
via a double pole isolating switch to BS 3456. The cable must be
2.5mm
2
heat resistant (85°C HOFR) sheathed flex complying to BS
6141:1981 Table 8. do not operate the immersion heater/s until the
unit is full of water. do not operate the immersion heater/s if any
sterilisation liquid is in the cylinder as this will cause premature
failure.
ELECTRICAL CONNECTIONS
Complete the wiring – use the appropriate wiring diagrams on
page 15 - 18.