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Setting the flow temperature
Press E button (see fig. 50, item 2) three times then
adjust the flow temperature to the desired temperature
(30 °C – 80 °C) using the C and D keys (see fig. 45,
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.
2.1.4
Checking the gas type
It is very important that the gas type to which the boiler will be
connected corresponds to the gas type the boiler is equipped
with. If this is not the case, then the boiler must not be put into
operation.
Check the gas type with your gas supplier and compare
this to the boiler's gas type as registered on the identfica-
tion tag (see table 3).
It is possible to change the boiler to another gas type (see
table 2). This accessory can be ordered from your supplier.
2.1.5
Measuring the gas-supply pressure
(flow pressure)
There are two ways to measure the gas-supply pressure:
– measuring the standing gas-supply pressure (boiler not in
operation);
– measuring the working gas-supply pressure (boiler
operating at full power).
Subject to modifications resulting from technical improvements!
Installation and maintenance instructions for Buderus 500 - 24/S • 08/2006
Commissioning
Type of gas
Factory settings of gas burners
When delivered ready for operation and set
to Wobbe index 14.1 kWh/m
15 °C, 1013 mbar), applicable for Wobbe
Natural gas H
index range 11.3 to 15.2 kWh/m
Inscription on gas-type indicating label:
Category setting: 2H - G 20_20 mbar
After adaptation by a CORGI registered
installer, the unit can be run on LPG.
LPG
Inscription on gas-type indicating label:
Category setting: 3P G 31_37 mbar
table 2
Gas-supply types
Gas injectors
Type of gas
Buderus 500
Natural gas H
(G20)
LPG
table 3
Gas injector diameter
Buderus • http://www.buderus-domestic.co.uk
3
(referred to
3
.
∅
[mm]
Venturi
tubes
24/S
4.45
Standard
3.45
Standard
2
35
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