Buderus Logano plus GB312 Istruzioni per l’uso
CAUTION!
Observe the safety instructions of this installation and
maintenance manual before placing the boiler in oper-
ation.
DANGER!
If installation, adjustment, modication, operation or
maintenance of the heating system is carried out by
an unqualied person, this may result in danger to life
and limb or property damage. The directions of this
installation and maintenance manual must be fol-
lowed precisely. Contact a qualied service com-
pany, service provider or the gas company if support
or additional information is required.
CAUTION!
The operating manual is a component of the techni-
cal documentation and must be handed over to the
operator of the heating system. Discuss the instruc-
tion in this manual with the owner or operator of the
heating system to ensure that they are familiar with all
information required for operation of the heating sys-
tem.
NOTICE!
In the Commonwealth of Massachusetts this appliance
must be installed by a licensed plumber or gas tter.
Applications Manual Gas condensing boiler
(Natural Gas only)
Logano plus GB312
GB312AM 04/08
2| GB312 Applications Manual
Logano plus GB312 applications manual | 04.2008
Technical specifications are subject to change without prior notice
Logano plus GB312 applications manual | 04.2008 Technical specifications are subject to change without prior notice
GB312 Applications Manual | 3
Table of Contents
1 Product description 4
2 Installing the boiler 10
3 Water quality requirements 12
4 Openings for combustion air supply & venting 16
5 Venting requirements 17
6 Piping the boiler 26
7 CSD-1 Kit 31
8 Internal boiler wiring diagram 33
9 MC10 wiring diagram 34
10 Sequence of operations 35
11 Examples of installations 36
12 Pump and low loss header selection 50
4| GB312 Applications Manual
Logano plus GB312 applications manual | 04.2008
Technical specifications are subject to change without prior notice
1 Product description
The Logano plus GB312 ( Fig. 1) is supplied with a fully
factory-fitted and ready-wired Logamatic BC10 basic programmer.
Fig. 1 Logano plus GB312 - main components
1Programmer (MC10 and BC10)
2Gas burner
3Boiler front panel
4Trap
5Boiler heat exchanger with insulation
6Burner control unit
7Gas valve
8Boiler outer casing
9B-kit with ow check valve (supplied as standard, not fac-
tory installed)
10 Gas isolating valve (supplied as standard, not factory
installed)
11 Mating ange, 2½" (included in B-kit, not factory installed)
7 747 010 720-01.2RS
10
11
The main components of the Logano plus GB312
(Fig. 1) are:
– Programmer — Item 1
– Frame and casing — Item 8
– Boiler heat exchanger with insulation — Item 5
– Gas burner — Item 2
– B-kit (standard B-kit comprising temperature/pressure
gauge, pressure relief valve, supply manifold, mating
flange for flow/return piping, not factory installed)
– Gas isolating valve — Item 10
The programming unit monitors and controls all electrical
boiler components.
The boiler heat exchanger transfers the heat generated by
the burner to the heating water. The thermal insulation
reduces radiant and standby heat loss.
Logano plus GB312 applications manual | 04.2008 Technical specifications are subject to change without prior notice
GB312 Applications Manual | 5
Fig. 2 Logamatic BC10 basic programmer - controls
1On/o switch
2Dial for DHW set point
3“DHW heating” LED
4Status display screen
5Control knob for maximum boiler temperature
6“Heat demand” LED
7Base plate with slot for a programming unit e.g. RC35
(behind the cover panel)
8“Burner” LED (ON/OFF)
9Socket for connecting diagnostic plug
10 “Status display” button
11 “Flue gas test” button
12 “Reset” button
1
23 4 5 6
789101112 7 747 010 720-85.1RS
(available : Fall 2008)
Logamatic BC10 basic programmer (Fig. 2). The Logama-
tic
BC10 basic programmer enables basic operation
of the heating system. It provides functions such as the
following for that purpose:
– Turning the heating system on/off
– Setting the DHW temperature and the maximum boiler
temperature in heating mode
– Status display
On overall picture of the controls of the Logamatic BC10
basic programmer can be obtained from Fig. 2.
Many other functions for the convenient control of your
heating system are available with a programming unit
(such as the RC35*).
* Available separately by Fall 2008
6| GB312 Applications Manual
Logano plus GB312 applications manual | 04.2008
Technical specifications are subject to change without prior notice
1.1 Package contents
The Logano plus GB312 is supplied complete with BC10
basic control unit and MC10 programming unit.
• On delivery, check that the packaging is undamaged.
• Check that all package contents are present.
• Dispose of packaging in an environmentally responsible
˙˙˙manner.
Component Packaging
Boiler (fully assembled with outer
casing, Logamatic MC10 program-
ming unit, BC10 and gas isolating
valve)
1 box on a pallet
Technical documentation 1 foil package
Set of adjustable feet 1 foil package
B-kit (temperature/pressure gauge,
pressure relief valve, supply connector,
ow/return mating ange, check
valve)
1 box
Logano plus GB312 applications manual | 04.2008 Technical specifications are subject to change without prior notice
GB312 Applications Manual | 7
1.2 Dimensions and specifications
1.2.1 Logano plus GB312 dimensions
Fig. 3 Connections and dimensions for Logano plus GB312 (sizes in inches)
AA = Flue connection
AL = Combustion air pipe connection (balanced ue opera-
tion only)
VK = Boiler supply
AKO = Condensate outlet
GAS = Gas connection + main isolating valve
ST = Pressure relief valve connection
RK = Boiler return
TM = Pressure/temperature gauge
TM
RK
7 747 010 720-02.3RS
59¾''
55⅛''
⅝- 1''
8½'
28¼''
19½''
1⅜"
8.7'' 4 ''
24¼''
40⅛''
45''
8½''
Boiler size (output - no. of heat exchanger
sections) Model 90 - 4 120 - 4 160 - 5 200 - 6 240 - 7 280 - 8
Width B Inches 39⅛47⅜55½
Dimension XAA Inches 13⅛15⅛17¼ 19¼ 21⅜
Dimension XRK (= XAL = XGAS) Inches 10⅝14¾ 10⅝ 14¾ 10⅝
Dimension F Inches 31½ 39¾ 48
Dimension A Inches 1½51½5
AA = Flue pipe diameter Inches 6⅜8
Flue adaptor for desired manufacturer's ue
system
"8x"8"6x"5x"⅜6
Dimension YAA Inches 9½18½1
Dimension ZAA Inches ¼21¾5
AL = Diameter of combustion air pipe (bal-
anced ue only)
Inches 4
Connections VK and RK 2½" NPT
Tab. 1 Dimensions and connection sizes
(Use rubber plumbing adapter to connect)
"⅜6
8| GB312 Applications Manual
Logano plus GB312 applications manual | 04.2008
Technical specifications are subject to change without prior notice
Connection ST (B-kit) TPN"1TPN"¾
Diameter GAS TPN"¼1TPN"1
Boiler size (output - no. of heat exchanger
sections) Model 90 - 4 120 - 4 160 - 5 200 - 6 240 - 7 280 - 8
Tab. 1 Dimensions and connection sizes
1.2.2 Specifications
Observe all standards and guidelines appli-
cable to the installation and operation of the
heating system in your country. The informa-
tion on the boiler rating plate is denitive and
it is imperative that it is observed.
Boiler size (output - no. of heat exchanger sec-
tions) Model 90 - 4 120 - 4 160 - 5 200 - 6 240 - 7 280 - 8
Natural gas
I-B-R Input max. load Btu/hr
328,300 440,500 588,300 732,600 880,700 1,028,800
min. load Btu/hr
132,150 132,000 176,000 220,000 264,000 309,000
I-B-R gross output 180/80 ° F max. load Btu/hr
305,000 409,000 544,000 676,000 810,000 944,000
I-B-R net rating 180/80 ° F max. load Btu/hr
265,000 356,000 473,000 588,000 704,000 821,000
Rated heat input 122/86 ° F max. load Btu/hr
307,090 409,460 545,940 682,430 818,910 955,400
(50/30 ° C) min. load Btu/hr 128,050 127,390 171,190 212,310 255,220 298,140
Flue gas mass ow rate 180/80 ° F max. load lb/min 4.85 6.53 9.14 11.40 13.88 16.15
Flue gas mass ow rate 122/86 ° F max. load lb/min 5.05 7.12 9.29 11.61 14.02 16.65
Flue gas temperature 180/80 ° F max. load ° F 83 90 127 138 140 134
Flue gas temperature 122/86 ° F max. load ° F 120 133 129 131 131 135
CO2 content, natural gas max. load %9.1
min. load
Available ue pressure in. W.C. 0.4 (100 Pa)
(ue draft + air supply pressure)
Air supply volumetric ow rate cfm 95 95 130 160 190 220
Blower G1G 170
Honeywell gas valve V4730C1071 V4730C1097 V4730C10
63
Gas injector diameter
Natural gas caloric value 1075 BTU/ft3 17.0
Heating water circuit
Boiler water capacity US gal-
lons 4.2 4.2 5.3 6.3 7.1 7.9
Primary pressure drop psi Fig. 4 (graph)
Maximum ow temperature, heating/hot water
mode (at full output) ° F 172/180
High temperature cut-out safety limit (manual
reset high limit setting )° F 200
Permissible operating pressure psi 50
Electrical data
Enclosure class IP 40
Mains power supply V/Hz 120 V / 60 Hz
Power consumption max. load W84 150 190 230 270 370
min. load W40 40 45 50 50 50
Maximum permissible fuse rating A10 (slow blow)
Appliance dimensions and weight
Transport clearance dimensions, width x depth x
height Inches 34x25x60 42x25x60 50x25x60
Weight lbs 455 530 585 665 730
Boiler size (output - no. of heat exchanger sec-
tions) Unit 90 - 4 120 - 4 160 - 5 200 - 6 240 - 7 280 - 8
Tab. 2 Specications
fm
mm
Logano plus GB312 applications manual | 04.2008 Technical specifications are subject to change without prior notice
GB312 Applications Manual | 9
Fig. 4 Primary circuit ow resistance, GB312 with check valve
xFlow rate in gal/min (GPM)
yPrimary pressure drop in psi
The boiler is factory-set for: – Natural gas
0,1
1
10
100
0001001011
x
y
90-4
120-4
160-5
200-6
240-7
280-8
7 747 010 720-30.1RS
Gas ow rate
3
cu ft/hr
6.4234-09
120 - 4 434.4
0.9755-061
200 - 6 720.6
8.8687-042
280 - 8 1013.4
Tab. 3 Gas ow rate (based on gas temperature of 60 °F and air pressure of 30 in. Hg)
Boiler rating
Natural gas
Caloric value 1075 BTU/ft
434.4
720.6
1013.4
Note:
• This series of boiler is not available for LP
(Liquid Propane)
• There is no field retrofit kit available to convert
this series boiler to LP gas
10 | GB312 Applications Manual
Logano plus GB312 applications manual | 04.2008
Technical specifications are subject to change without prior notice
2 Installing the boiler
2.1 Recommended wall clearances
When deciding on the installation site, the clearances for
the flue piping and the connecting pipes must be
observed (Fig. 9 and Section 5.1, Connecting the flue
system and water and gas piping).
Fig. 5 Wall clearances in the boiler room
Dimension Wall clearance (inch)
minimum
Recom-
mended
A2028
B1)
1) This clearance dimension is dependent on the ue system tted
22 28
C2028
D20 28
E1) 614
Tab. 4 Recommended and minimum wall clearances
(dimensions in inches). It is imperative that the
minimum clearance (dimension E) is main-
tained.
Where applicable, allow extra wall clearances
for additional components such as DHW
tank, pipe connections or other ue
components, etc.
7 747 010 720-09.1RS
A
DB
E
C
Notes: (multiple boiler installations)
A. Minimum clearance between boilers
• Refer to “D” dimension for side by side installations
• Refer to “B” and "E" dimension for back to back
installations
B. See Table 4 for all other clearance dimensions.
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9
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