Commissioning,
Draining Down & Safety
21
6
Commissioning, Draining Down & Safety
6.1 Filling the Cylinder
IMPORTANT
Before filling the cylinder check that the
immersion heater has not loosened in
transit. Tighten as necessary using a
shaped spanner. Stillsons or pipe grips
should not be used.
1. Open all hot water taps.
2. Turn on the stop cock.
3. When water flows from all taps
close the taps.
4. Allow system to stabilise for five
minutes.
5. Open each hot water tap in turn to
expel air from the system pipe work.
6. Check for leaks.
7. Manually operate Temperature and
Pressure Relief Valve (16) - Figures
2-4 to 2-6, to ensure free water
flow through discharge pipe. (Turn
knob to left).
6.2 Draining Down
Switch the electrical power off
(important to avoid damage to element).
Isolate boiler from DuoWave unit.
Turn off the cold water supply valve
(stop cock). Open hot water taps. Open
drain (20) - Figures 2-4 to 2-6. The unit
will drain.
6.3 Safety Cut-Out
1. The safety cut-out operates if:
a. Wiring is incorrect.
b. The immersion heater thermostat or
cylinder thermostat fails.
c. Thermostat is set too high.
2. Remember before resetting the
safety cut-out or altering the
thermostat setting, isolate electrical
supply to the unit prior to removal
of the electrical box lid.
3. Reduce thermostat setting and
press the reset button. After
adjustments are completed, ensure
the lid to the electrical box is
replaced correctly and the retaining
screw is fitted.
4. If the problem persists, please
contact your installer in the first
instance.
6.4 Cold Water Discharge from
Tundish
There are two reasons why cold water
will discharge from the tundish:
1. The pressure reducing valve has
malfunctioned (This will cause a
large volume of water to flow
through the tundish).
2. The Expansion relief valve is letting
by (This will cause a very low
volume of water to flow through
the tundish).
In both cases, identify the defective
component and replace. All repairs
must be carried out by a competent
person.
6.5 Hot Water Discharge from
Tundish
There are four reasons why hot water
will discharge from the tundish:
1. Thermal cut-out has malfunctioned.
2. The control thermostat has
malfunctioned.
3. The T & P valve is letting by.
4. The expansion vessel has failed or
lost its charge.
In all cases, should a repair be
necessary, the work must be carried
out by a competent person.
Isolate the cylinder from all electrical
supplies before commencing
maintenance work.
6.6 Expansion Vessel
1. The expansion vessel is connected
into the cold water supply to the
cylinder using the flexible hose.
Flexible hose not supplied with 50
litre vessel. This vessel is connected
using rigid pipe. Refer to Section
4.3.
Note:
No valve should be fitted between
the expansion vessel and the
supply pipe.
2. Ensure that the air charge in the
vessel matches the pressure setting
shown on the pressure reducing
valve.
3. The expansion vessel must be
installed even if an accumulator is
fitted.
4. The charge of the vessel must be
checked at every annual service.
6.7 Customer Handover
1. Complete the Benchmark book
supplied with the Cylinder and leave
it with the User.
2. Explain the operation of the system
to the User, referring to Section 10
of these instructions.
3. In particular, make the User aware
of what to do if water is seen to
flow from either the T&P Valve or
Expansion relief Valve. Refer User to
the Information given in Section 10.
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