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2
Commissioning
Setting the boiler to summer operation
When you want to make sure that your boiler will not operate
for central heating in the summer then you can set the boiler to
summer operation. The boiler will then only operate for DHW.
Press the E button (see fig. 47, item 2) three times.
The current setting blinks.
Use the C or D keys to adjust to desired setting.
Central heating is on.
Central heating is off (summer operation).
DHW is still available.
NOTE
When summer operation is active then the
boiler will not operate for central heating until
summer operation has been deactivated.
Setting the flow temperature
Press E button (see fig. 47, item 2) four times then adjust
the flow temperature to the desired temperature
(30 °C – 80 °C) using the C and D keys (see fig. 42,
item 1). Factory setting is 80 °C.
It is not possible to set the flow temperature when the boiler is
set to summer operation.
Frost protection
The boiler has an automatic frost protection. When the CH flow
temperature drops below 7 °C then the boiler will start up.
2.1.3
Checking for gas leaks
Use a suitable pressure gauge for the different pressure read-
ings. It should be able to handle pressures up to 50 mbar with
an accuracy of 0.01 mbar minimum.
Disconnect the system from the power supply.
Check all sections of gas pipework and connections for
signs of leaks before starting up the system for the first
time. If a leak is detected during tightness testing, use an
approved leak detector to check all connections for
possible escapes. The product must be certified as a gas
leak-testing agent. DO NOT allow the product to come into
contact with electrical wiring.
The test pressure of the gas pipe when the gas shut off valve
is open may not exceed 150 mbar.
ATTENTION
Check the used measuring nipples for gas
tightness.
Subject to modifications resulting from technical improvements!
34
Installation and maintenance instructions for Buderus 500 - 24/C and 500 - 28/C • 02/2005
Boulter Buderus Ltd. • http://www.boulter-buderus.co.uk
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