9 Start-up
30
Installation and maintenance instructions Energy
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0020300877_01
9
Start-up
9.1
Carrying out the initial start-up
Initial start-up must be carried out by a customer service
technician or an authorised competent person using the
benchmark checklist. The benchmark checklist in the ap-
pendix (
Page 52) of the installation instructions must be
filled out and stored carefully along with the unit's document-
ation.
▶
Carry out the initial start-up using the benchmark check-
list in the appendix.
▶
Fill out and sign the benchmark checklist.
9.2
Heating water supply in the sealed heating
system
TEMPORARY
CONNECTION
HOSE
UNION
HOSE
UNION
SUPPLY
PIPE
CONTROL
VALVE
CONTROL
VALVE
DOUBLE
CHECK
VALVE
HEATING
CIRCUIT
DRAIN
POINT
BOILER
RETURN
FLOW
Method 1
SUPPLY
PIPE
AIR GAP
TUNDISH
CONTROL
VALVE
CONTROL
VALVE
TYPE CA BACKFLOW
PREVENTION DEVICE
BOILER
RETURN
FLOW
HEATING
CIRCUIT
DRAIN
POINT
Method 2
A safety valve must be fitted to a sealed system. It shall be
preset, non-adjustable with a lift pressure of 3 bar, incorpor-
ating seating of a resilient material, a test device and a con-
nection for drain. The drain from the safety valve must be
routed outside the building, must not discharge above an en-
trance or window or any type of public access area, be clear
of any electrical fittings and positioned so that any discharge
can be seen.
A diaphragm type expansion vessel, conforming to the cur-
rent issue of BS 4814 (see also BS 7074 Part 1 and 2) must
be connected at a point close to the inlet side of the circu-
lating pump, see the diagrammatic layout, above unless laid
down differently by the manufacturer. The expansion ves-
sel volume depends on the total water system volume and
the initial system design pressure. For any system an ac-
curate calculation of vessel size is given in the current is-
sue of BS 5449 and BS 7074 Part 1. Example: For an initial
design pressure of 0.7 bar, the minimum total vessel volume
required is 0.063 x Total System Volume.
Note
A higher initial design pressure requires a larger
volume expansion vessel.
In GB, guidance on vessel sizing is also given in the cur-
rent issue of BS 5449 and BS 7074 Part 1. In IE refer to the
current edition of I.S. 813 “Domestic Gas Installations”. The
charge pressure must not be less than the static head of the
system, that is, the height of the highest point of the system
above the expansion vessel.
A pressure gauge with a set pointer and covering at least
0 to 4 bar (0 to 60 lb/in
2
) shall be fitted permanently to the
system in a position where it can be seen when filling the
system.
9.3
Checking and treating the heating
water/filling and supplementary water
Caution.
Risk of material damage due to poor-qual-
ity heating water
▶
Ensure that the heating water is of suffi-
cient quality.
▶
Before filling or topping up the installation, check the
quality of the heating water.
Checking the quality of the heating water
▶
Remove a little water from the heating circuit.
▶
Check the appearance of the heating water.
▶
If you ascertain that it contains sedimentary materials,
you must desludge the installation.
▶
Use a magnetic rod to check whether it contains mag-
netite (iron oxide).
▶
If you ascertain that it contains magnetite, clean the in-
stallation and apply suitable corrosion-inhibition meas-
ures, or fit a magnetic filter.
▶
Check the pH value of the removed water at 25 °C.
▶
If the value is below 6.5 or above 8.5, clean the installa-
tion and treat the heating water.
▶
Ensure that oxygen cannot get into the heating water.
Checking the filling and supplementary water
▶
Before filling the installation, measure the hardness of the
filling and supplementary water.