18 Commissioning
18.1 The system is filled with water and checked
for watertightness. The expansion vessel is
checked against the manufacturer’s stated
specification (3.5 bar). The expansion valve and
the combined temperature and pressure relief valve
are manually operated to ensure water discharge
from the valves runs freely through the tundish to the
termination point. The valves are visually checked
to ensure that they re-seat satisfactorily. Heat is
applied to the system and is allowed to reach
normal working temperature. The operation of the
thermostat is checked and an examination carried
out to ensure that no water has discharged from the
expansion valve or the combined temperature and
pressure relief valve during the heat-up.
18.2 On completion of the commissioning process
the
competent person
completes the label attached
to the system, stating that the installation complies
with the Certificate (see section 3).
Technical Investigations
The following is a summary of the technical
investigations carried out on the Kwikot Direct
Unvented Hot Water Storage System.
19 Tests and investigations
19.1 Tests were carried out in accordance with
MOAT No 38 : 1986 to determine:
• capacity of storage cylinder
• dimensional accuracy
• mean supply temperature
• outlet flow rate at various supply flow rates and
pressures
• time taken to heat to 60°
• re-heat time to 60°
• standing energy loss (adequacy of insulation)
• watertightness
• resistance of the storage cylinder and expansion
vessel to an internal hydrostatic pressure of
1.5 times the design pressure = 7.5 bar
• resistance to partial vacuum of 0.1 bar absolute
• flow capacity of the tundish and discharge
pipework.
19.2 Tests were carried out to confirm satisfactory
operation of the following components when fitted
in a system:
• cold water control valves, to include:
– pressure control valve
– expansion valve
– check valve
• combined temperature and pressure relief valve
•
immersion heater thermostat and non-self-resetting
t
hermal cut-out
• line strainer.
19.3 An examination was made of existing data
in relation to the performance requirements of the
relevant British Standards, to determine the
suitability and performance of:
• cold water control valves, to include:
– pressure control valve to BS 6283-4 : 1991
– check valve to BS 6282-1 : 1982
– expansion valve to BS 6283-1 : 1991
• combined temperature and pressure relief valve
to BS 6283-3 : 1991
• line strainer
• immersion heater to BS EN 60335-2.73 : 2003
• direct immersion heater
thermostat/non-self-resetting thermal cut-out to
BS 3955 : 1986
• expansion vessel to BS 6144 : 1990.
19.4 An examination was made of existing data
relating to:
• adequacy of installation instructions
• practicability of installation by the
competent
person
• electrical safety
• effect on water quality and prevention of waste
of water
• properties in relation to fire
• practicability and adequacy of maintenance
requirements
• durability of materials used.
20 Investigations
The manufacturing and assembly process was
examined, including the methods adopted for
quality control, and details were obtained of the
quality and composition of materials used.
7
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