Buderus Logamax plus GB142-24 User manual

7215 0300 - 02/2008 US/CA (en) For the user
Please read thoroughly before operating
User’s Instructions
Condensing gas boiler
GB142-24/30/45/60
This manual must be retained for future use.

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Warning: If the information in these instructions is not followed exactly, a fire or
explosion may result causing property damage, personal injury or loss of life.
– Do not store or use gasoline or other flammable vapors and liquids in the vicinity
of this or any other boiler.
– What to do if you smell gas
• Do not try to light any boiler.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor’s phone. Follow the gas
supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
– Installation and service must be performed by a qualified installer,
service agency or the gas supplier.
CAUTION !
The operating manual is part of the documentation that is delivered to the
installation's operator. Go through the information in this manual with the owner/
operator and make sure that he or she is familiar with all the necessary operating
instructions.

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Contents
1 For your safety . . . . . . . . . . . . . . . . . . . . 5
1.1 Designated use . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Safety instructions . . . . . . . . . . . . . . . . . . . . 6
2 Lighting Instructions . . . . . . . . . . . . . . . 8
2.1 Operating the BC10 basic controller . . . . . . 9
2.2 Opening and closing the control panel . . . . 10
2.3 Switching on and off . . . . . . . . . . . . . . . . . . 10
2.4 Setting the DHW temperature value . . . . . 11
2.5 Entering the space heating water
temperature . . . . . . . . . . . . . . . . . . . . . . . . 13
2.6 "Burner on" LED . . . . . . . . . . . . . . . . . . . . . 14
2.7 Other functions and economic heating . . . 14
3 Starting up and shutting down
the boiler . . . . . . . . . . . . . . . . . . . . . . . 15
3.1 Starting up the boiler . . . . . . . . . . . . . . . . . 15
3.2 Shutting down the boiler . . . . . . . . . . . . . . 18
4 Operating and error messages . . . . . . 19
4.1 Displaying operating messages . . . . . . . . . 19
4.2 Identifying and resetting faults . . . . . . . . . . 23

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Preface
About these instructions
These user's Instructions contain important information for the safe and proper operation of
GB142-24/30/45/60 condensing gas boilers.
If the information in this manual is not followed exactly, a fire or explosion may result causing property
damage, personal injury or loss of life.
Subject to technical changes!
Changes may be made following technical improvements!
Updating of documentation
Please contact us if you have any suggestions for improvements or corrections.

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For your safety
1 For your safety
GB142 condensing gas boilers are designed and
built according to the latest technological advances
and safety requirements.
The design is specifically focused on ease of use.
To ensure the safe, economical and environmen-
tally friendly use of the heating system we urge you
to read and observe the User's Instructions.
1.1 Designated use
The GB142 was designed for heating water for a
central heating system and for generating domestic
hot water. The boiler can be fitted with a modulating
outdoor reset control AM10 (scope of delivery),
a room controller RC35 (optional) or an On/Off
thermostat (accessory).
Hazard definitions
ADANGER:
Indicates the presence of hazards that will
cause severe personal injury, death or
substantial property damage.
AWARNING:
Indicates the presence of hazards that can
cause severe personal injury, death or
substantial property damage.
ACAUTION:
Indicates presence of hazards that will or
can cause minor personal injury or property
damage.
HCAUTION:
Risk of electric shock.
Indicates presence of hazards due to electric
shock.

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For your safety
INOTICE
Indicates special instructions on installation,
operation or maintenance that are important
but not related to personal injury or property
damage.
1.2 Safety instructions
Make sure to observe these safety instructions.
Failure to do so can result in property damage,
personal injury or loss of life.
– Installation, gas and flue connection,
commissioning, electrical connection and
maintenance activities must only be carried out
by a trained service provider.
– Certain work, e.g. on gas lines, may require a
professional license. Only carry out such work if
you are licensed to do so.
– Only use the boiler for its intended purpose and
only when it is in working order.
– Have a trained service provider check, clean
and service the heating system once a year.
Buderus recommends a contract for annual
service and maintenance.
– The condensate collection and disposal system
must be periodically cleaned by a trained
service technician.
– Have your trained service provider give you
detailed instructions about the operation of the
heating system.
– Carefully read these user's instructions.
– Immediately have all defects to the heating
system repaired.
– Ensure that air intake and outlet openings are
open and free from obstructions at all times.
– Do not store any flammable material or liquids in
the immediate vicinity of the boiler.

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For your safety
– Never use chlorinated detergents or
halogenated hydrocarbons (e.g. in spraycans,
solvents and detergents, paints, adhesives) in
the room where the boiler is installed.
– When Calcium Chloride is present in concrete
floors (when poured in winter) it is necessary to
seal the floor with a suitable paint.
– Do not allow too much dust to collect on the
device.
– Do not use the boiler if any part has been under
water. Immediately call a trained service
technician to inspect the boiler and to replace
any part of the control system and any gas
control which has been under water.
– Should overheating occur or the gas supply fail
to shut off, do not turn off or disconnect the
electrical supply to the pump. Instead, shut off
the gas supply at a location external to the
boiler.
– The venting system must be inspected annually.
Replace any parts which show deterioration
from corrosion or any other sources.
– This boiler does not have a pilot. It has an
ignition device which automatically lights the
burner.
– Check for smell of gas around the boiler area.
Be sure to smell next to the floor because
propane gas is heavier than air and will settle on
the floor.
– Use only your hand to turn the gas control knob
(fig. 3 on page 15). Never use tools. If the knob
will not turn by hand, don't try to repair it, call a
trained service technician. Force or attempted
repair may result in a fire or an explosion.

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Lighting Instructions
2 Lighting Instructions
ASTOP!
Read the chapter "For your safety" on page 5 before
lighting the boiler.

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Lighting Instructions
2.1 Operating the BC10 basic controller
1) ECO mode means that the temperature inside the hot water tank is 140 °F.
Fig. 1 Logamatic BC10 basic controller – Controls
pos. 1: Main switch
pos. 2: DHW temperature knob 1)
pos. 3: LED "DHW status"
pos. 4: Display
pos. 5: Space heating water
temperature knob
pos. 6: LED "Burner status"
pos. 7: LED "Burner Operation"
pos. 8: Service Tool connector
pos. 9: "Service" button
pos. 10:"Chimney sweep" button
pos. 11:"Reset" button
190
170
150
130
90
110
140
130
120
90
100
110
42
1
5
711 910
3 6
8

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Lighting Instructions
2.2 Opening and closing the control panel
zBriefly push the drawer to open the control panel (fig. 2).
The drawer will come out. The control panel consists of the
Logamatic BC10 basic controller (fig. 1).
z
Close the control panel by pushing it back into the boiler .
2.3 Switching on and off
zSet the main switch on the BC10 to position "1" (On) to
switch on the boiler and set it to "0" to switch it off.
HCAUTION
Risk of electric shock.
If a hazardous situation occurs, shut off power to the
boiler using the emergency shutoff switch or the boiler
circuit breaker (see chapter 3 "Starting up and shutting
down the boiler", page 15). Make yourself familiar with
the location of the emergency shutoff switch and the
boiler loop circuit breaker.
Fig. 2 Opening and closing the control panel

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Lighting Instructions
2.4 Setting the DHW temperature value
zCheck the local code for the max. DHW temperature.
zTurn the "DHW temperature" rotary knob to set the desired
temperature of the hot water in the DHW tank.
1This function has been optimized for boilers with combined DHW heating (combi-units).
2The LED under the rotary knob lights up if the DHW temperature is below the target value (heat request for DHW).
140
130
120
90
100
110
Condition Explanation LED
0Off No hot water supply (only heating mode). Off
Eco 1Economy mode,
Hot water temperature 140 °F
The DHW will only be reheated to 140 °F, if the
temperature has signifcantly fallen. This reduces the
number of burner starts and saves energy. As a result
the water may be a bit cooler initially.
On 2
90–140 Direct setting on BC10 in °F The temperature set on the BC10 is a temperature that
cannot be changed using a RC thermostat.
On 2
Aut Entry via thermostat (presetting) The temperature is set on the thermostat (e. g. RC35).
If no thermostat is connected, the maximum DHW
temperature is 140 °F.
On 2
Table 1 Settings of "DHW temperature" knob

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Lighting Instructions
Anti-scald table
Temperature of water
in degrees F
Minimum time for
first degree burn
Minimum time for second or
third degree burn
111 5 hours 7 hours
116 35 minutes 45 minutes
118 10 minutes 14 minutes
122 1 minute 5 minutes
131 5 seconds 25 seconds
140 2 seconds 5 seconds
149 1 second 2 seconds
158 –1 second
Table 2 Temperature/Time/Burn Chart

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Lighting Instructions
2.5 Entering the space heating water temperature
zTurn the "space heating water temperature" knob to set the
upper limit value of the heater water for the heating opera-
tion. This limitation does not apply to DHW preparation. 190
170
150
130
90
110
Condition Explanation LED
0Off No supply to heating system (only DHW heating operation). Off
90 – 190 Direct setting on BC10
in °F (90 – 190 °F)
The temperature set on the BC10 is a temperature that cannot
be changed using a RC thermostat. Supply temperature does
not rise above the set temperature.
On 1
Aut Entry via thermostat
(presetting)
The temperature is automatically determined on the basis of the
heating characteristic. If no thermostat is connected, the
maximum heater temperature is 190 °F.
On 1
Table 3 Settings of "space heating water temperature" rotary knob
1The LED under the rotary knob lights up when the heating system is switched on and heat is requested.
In summer mode the heating system is switched off (LED off).

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Lighting Instructions
2.6 "Burner on" LED
The LED indicates the operating condition of the burner.
2.7 Other functions and economic heating
The functions described above are basic functions, carried out directly on the boiler using the
Logamatic BC10 basic controller.
LED Condition Explanation
On Burner active The water in the boiler is being heated.
Off Burner off The water in the boiler has reached the required temperature or there is no heat
request.
Table 4 LED indication

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Starting up and shutting down the boiler
3 Starting up and shutting down the boiler
3.1 Starting up the boiler
zTurn the "space heating water temperature" and "DHW
temperature" rotary knobs to "Aut" (automatic mode).
The control unit will now take control.
190
170
150
130
90
110
140
130
120
90
100
110
+

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Starting up and shutting down the boiler
zOpen the gas shut-off valve (fig. 3, pos. 1).
Lightly push on the gas shut-off valve and turn it to the left
(counterclockwise). In "open" position the gas shut-off
valve is parallel to the gas pipe.
zOpen the boiler manifold shut-off valves (fig. 3, pos. 2).
Fig. 3 Opening the gas shut-off valve and the
boiler manifold shut-off valves
pos. 1: gas shut-off valve
pos. 2: boiler manifold shut-off valves
12

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Starting up and shutting down the boiler
zSet the main switch on the basic controller to position "1"
(On). The basic controller checks the current system status
and the burner becomes operational as soon as there is a
heat request. This procedure takes approx. 30 seconds.
zAdjust the settings on the control unit (see the Operating
Instructions for the control unit).

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Starting up and shutting down the boiler
3.2 Shutting down the boiler
zSet the main switch on the basic controller to position "0"
(Off).
zClose the gas shut-off valve and disconnect the boiler from
the power supply.
ADANGER!
The heating system may freeze if it is not operational in
times of freezing weather.
– Protect the heating system against freezing if there
is a danger of frost affecting the system.
– Drain the heating system water from the lowest
point of the heating system using the boiler drain.
The vent screw at the highest point of the heating
system must then be open.

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Operating and error messages
4 Operating and error messages
4.1 Displaying operating messages
In normal operating mode the display will show the current
heater water temperature. You can display other information
using the "Service" button.
zPush the "Service" button a number of times to switch
between the various status displays.

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Operating and error messages
Display (example) Meaning
1 Current boiler water temperature (in °F)
2 Current system pressure (in psi)
2 Operating message (see table 5):
Current condition of heating system
1Standard display for this operating condition. This display appears after 5 minutes if no button is pushed.
2Other values may be displayed depending on the operating condition. You can return to the starting point by repea-
tedly pushing the "Service" button.
140
P21
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