Buderus GB142 User Manual
Applications Manual for
Buderus GB142 Wall Hung Heaters
BTC 435001101 A | 05.2009
1
Introduction
1
2
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2 sgnitteS pmuP dna dlofinaM depip-erP
2 sknaT tceridnI sureduB rof gniziS pmuP
4 rellortnoC 01CB
4 rellortnoC mooR 01CR
4 snoitpO gnitaeH ecapS
4 noitarepO gnitaeH WHD
3
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6 gnitaeH ecapS
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4
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9 gnitneV lacitreV
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5
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71 slobmyS lacirtcelE / lacinahceM
81 teser roodni dna enoz WHD htiw 241BG
02 enoz gnitaeh ffo/no dna enoz WHD htiw 241BG
GB142 with DHW zone, Comfort Zone and zone valves 22
GB142 with DHW zone, Indoor reset, Buderus Pumping Station and
zone valves
24
GB142 with DHW zone, single temperature of radiant. No Mixing Valve
required
26
GB142 with DHW zone, motorize mixing valve zone, thermostatic
mixing valves zone and high temperature zone.
28
GB142 with DHW zone, and high temperature on/off zones 30
GB142 with DHW zones, constant circulation w/ Comfort zone control 32
GB142 with DHW zone & the Buderus Quick Fit Modular Piping
systems
34
63 s’241BG elpitluM htiw gnipiP 241BG raeN
Multiple GB142 Units with DWH zone piping diagrams 40
14 sedoC rorrE 01CR
Table of Contents
Page 1
This GB142 Applications Manual is intended to present some of the most common applications
of the wall-hung Buderus GB142 heater for use in hot water space heating applications.
Applications are shown with both piping and corresponding electrical schematics. Auxiliary
equipment depicted does not necessarily represent any one particular manufacturer or specific
model number. There are a wide variety of techniques, practices and piping strategies possible
with hydronic heating systems and it is the responsibility of the installing contractor to determine
the most suitable arrangement for his application.
In an effort to simplify piping and electrical diagrams, only Diagrams 1P and 1E depict the
complete details with respect to piping and wiring of an indirect hot water tank. This part is left
off all subsequent drawings for clarity purposes.
Basic information regarding vent installation, clearances, condensate piping and termination
locations are included as well.
Although this manual covers many common applications for our equipment, system possibilities
are virtually endless. Should you encounter an application that is not covered in this manual or
have any questions regarding any of its content, we encourage you to contact your local sales rep
or us directly at Bosch Thermotechnology Corp.
1 INTRODUCTION 2 DESCRIPTION OF MAIN COMPONENTS
Page 2
P
RE-PIPED MANIFOLD AND PUMP SETTINGS
All GB142 are standard supplied with a pre-piped and wired heater manifold with pump to easily
facilitate required primary/secondary piping for the installing contractor. Shut-offs, relief valve,
pressure and temperature gauge, purge station on the supply leg and built-in flow check and a
Grundfos UPS15-58 3-speed heater pump are included on the return side of the manifold. (Refer
to Diagram 1P).
Table 1 show T values for different speed settings on the UPS15-58 pump for each GB142
model.
Table 1: Max Heater
T (ºF) Values for UPS 15-58 Manifold Pump
Heater Model Speed 1 Speed 2 Speed 3
GB142/24
26 N/A N/A
GB142/30
33 N/A N/A
GB142/45
N/A 32 28
GB142/60
N/A 43 32
Integrated heater controls will automatically reduce the heater input once the heater T exceeds
45 ºF regardless of feedback signal from the RC10 control. Complete burner shut-down will
always take place before
T exceeds 99 ºF. The maximum flow rates are as follows:
GB142/24 or /30: 11 GPM, model /45: 15 GPM, model /60: 20 GPM.
P
UMP SIZING FOR BUDERUS INDIRECT TANKS
All heating zones are piped directly off the supply (left) side of the heater manifold; with heating
returns combined on the return (right side). Piping connections for an indirect tank charging
pump (PS) are included on the heater manifold. Refer to Tables 2 and 3 for tank pump
recommendations for different Buderus indirect tanks. All piping to and from the indirect needs
to be at least 1”. Use a minimum number of elbows and keep piping lengths to a minimum.
Table 2: Indirect Pump Recommendations for GB142/24 and /30 models.
03/241BG42/241BG
Tank Model Grundfos Taco** B & G Grundfos Taco** B & G
S120
UP14-42 3*
007 NRF22 UP26-64 0012 PL30
ST150
UP26-64 0011 PL30 UP26-64 0013 PL35
ST200
UP26-64 0014 PL30 UP26-64 0011 PL45
ST300
UP26-64 0014 PL30 UP26-64 0011 PL30
ST400
NR 0011 PL45 NR NR NR
SU500
UP26-64 0014 PL30 UP26-64 0011 PL45
* Refers to Grundfos UP15-42 w/ built-in flow check and speed setting
** Refers to Taco 007 without built-in flow check
NR – combination not recommended
Page 3
Table 3: Indirect Pump Recommendations for GB142/45 and /60 models.
06/241BG54/241BG
Tank Model Grundfos Taco** B & G Grundfos Taco** B & G
S120
UP26-64 0014 PL36 UP26-64 0011 PL30
ST150
UP26-99 NR PL36 NR 0013 PL36
ST200
UP26-99 NR PL36 NR 0013 PL36
ST300
UP26-99 0013 PL36 UP26-99 0013 PL36
ST400
UP26-99 NR NR UP26-99 NR NR
SU500
NR NR PL36 NR NR NR
SU750 ***
UP26-64 0011 PL30
NR 0011 PL36
SU1000 ***
UP26-64 0012 PL30 UP26-64 0012 PL30
* Refers to Grundfos UP15-42 w/ built-in flow check and speed setting
** Refers to Taco 007 without built-in flow check
*** SU750 and SU1000 tanks are non stock. Allow 6 to 8 weeks for delivery.
NR – combination not recommended
Tables 4 and 5 show pump recommendations for 2 and 3 tank systems operating off a single
GB142 heater. Tank pumps are placed in parallel with each tank having its own pump. The
GB142 DHW sensor is placed in one tank; a high limit aquastat is to be installed in other tanks
and wired in series with the pump power to prevent over heating. Domestic water must be drawn
equally from the tanks.
Table 4: Two Tank Systems
GB142/30 GB142/45 GB142/60
Tank
B & G Grundfos Taco B & G Grundfos Taco B & G Grundfos Taco
ST150
PL50 15-42 009 PL30 26-64 0014 PL30 26-64 0011
ST200
PL50 15-42 009 PL30 26-64 0014 PL30 26-64 0011
ST300
PL50 15-42 009 PL30 26-64 0014 PL30 26-64 0011
ST400
PL50 15-42 009 PL30 26-64 0014 PL30 26-64 0011
Table 5: Three Tank Systems
GB142/30 GB142/45 GB142/60
Tank
B & G Grundfos Taco B & G Grundfos Taco B & G Grundfos Taco
ST150
NRF22 15-42 008 PL30 26-64 009 PL50 26-64 0014
ST200
NRF22 15-42 008 PL30 26-64 009 PL30 26-64 0014
ST300
NRF22 15-42 008 PL30 26-64 009 PL30 26-64 0014
ST400
NRF22 15-42 008 PL30 26-64 009 PL30 26-64 0014
Electrically the GB142 has 120 V connections for the heater manifold pump PK (4 Amp max),
indirect tank charging pump PS and DHW recirculation pump PZ (Max Amp draw of 5 Amp for
PS and PZ combined).
Page 4
The low voltage side is equipped with the following terminals:
1) RC terminals (orange color) for an indoor room sensor for firing and modulating the
burner. (RC10 control standard supplied with GB142).
2) FA optional outdoor sensor terminals (blue color) connections (requires RC34 controller;
available Fall 2005).
3) WA T-T terminals (light green color) connections for optional conventional thermostat.
4) FW DHW tank sensor terminals (light gray color) for sensing tank water temperature.
(Tank sensor standard supplied with GB142).
5) EV terminals (red color) for connecting of an optional safety such as LWCO, manual
reset high limit or any other type of external limit circuit.
BC10 C
ONTROLLER
A BC10 control panel is installed in every GB142 which includes a diagnostic display, status
indicator lights, dials for DHW and maximum heater temperature as well as programming and
diagnostic access buttons. A detailed description of all diagnostic and status codes is provided
with the GB142 Installation and Service Manual.
RC10 R
OOM CONTROLLER
A RC10 room controller is provided with every GB142 to provide indoor reset and pin point
precision control back to the BC10. The RC10 must be installed in a reference location for
indoor feedback to the GB142. The RC10 will control the modulation and heater water
temperature based on maintaining desired indoor comfort levels. The RC10 is typically placed
in the main living area for optimum comfort and accurate temperature control. Give careful
consideration to the placement of the RC10 sensor.
The use of the RC10 indoor room controller is shown in a number of diagrams to achieve
maximum comfort and efficiency from the product. Suggested timings of the post purge for the
boiler pump (PK) are shown on each wiring diagram.
Note:
Never
connect a RC10 control and a thermostat or end switch at the same time.
S
PACE HEATING OPERATION:
The PK boiler pump operates and the burner fires on a call for heat from the T-T terminal or
from the RC10 controller. Use only T-T connections or RC terminals,
but do NOT use both at
the same installation
. Once the call for heat is satisfied, the PK pump continues to operate
through an adjustable programmable post-purge cycle before shutting down. The PK pump can
also set to operate continuously for up to 24 hours after the last call for heat.
DHW H
EATING OPERATION:
A call for heat from the FW (DHW) sensor brings the control into DHW priority, shutting off the
PK pump, firing the boiler to maximum temperature and operating the PS pump. Internal logic
includes an anticipative DHW heating cycle with automatically adjusting post purge feature and
reduces burner modulation rate.
Page 5
3 DIMENSIONS, CONNECTIONS AND CLEARANCES 3 DIMENSIONS, CONNECTIONS and CLEARANCES
Fig. 1: Dimensions and Connections for GB142/24 and /30.
Fig. 2: Dimensions and Connections for GB142/45 and /60.
Page 6
V
ENTING GUIDELINES
The GB142 is suitable for side-wall as well as vertical venting using field supplied 3” PVC or
CPVC pipe in compliance with ANSI, ASTM D1785 (schedule 40 PVC), F441, D2665 (PVC-
DWV), or ABS-DWV Schedule 40. Cement and primer must comply with ASTM D2564. For
Canada, use CSA or ULC certified PVC or CPVC pipe, fittings and cement.
Foam core PVC
pipe can not be used.
Note:
Installation must comply with local requirements/codes, National Fuel Gas Code, ANSI
Z223.1 (USA installations) CSA B149.1 or B149.2 (Canadian installations). In Canada, venting
must comply with ULC-S636.
Note:
Installing contractor must install condensate tee (supplied by Buderus) immediately after
the first 90 degree flue elbow. Condensate must be drained into a condensate pump or
appropriate drain.
The GB142 is approved for both Direct Vent (sealed-combustion - see
FIG. 3A
for termination
location) as well as Direct Exhaust (non sealed-combustion - see
FIG. 3B
for termination
location) operation in both a horizontal and vertical vent arrangement. For room air applications,
follow National Fuel Gas Code to ensure ample combustion air. All PVC venting material is
approved for 0” clearance to combustibles for venting of the GB142 boiler.
Table 6: Maximum Equivalent Vent Lengths
Model Max Eq. Intake Length (ft) Max Eq. Exhaust Length (ft)
00100144/,03/,42/241BG
060606/241BG
Table 7: Friction Loss Equivalent for Fittings
Fittings or Piping Equivalent Length (ft)
3woblEº54
5woblEº09
Optional Concentric Vent Kit 3
4 VENTING GUIDELINES
Page 7
Fig 3B
12"
minim um
12"
minim um
12"
minim um
Fig. 3A
Page 8
D
IRECT VENT/SEALED COMBUSTION & DIRECT VENT/NON-SEALED
COMBUSTION TERMINATION GUIDELINES
WARNING: Follow these instructions when determining vent termination location to avoid
possibility of severe personal injury, death, substantial property damage or cross contamination
of combustion air. Gas vent extending through an exterior wall shall not terminate adjacent to the
wall or below building extensions such as eaves, parapets, balconies or decks. Failure to comply
could result in severe personal injury, death or substantial property damage. Locate the
concentric vent/air termination using the following guidelines.
The total length of piping for vent or combustion air should not exceed the limits in Table
6 for maximum output.
One must consider the immediate environment when locating the vent/air termination.
Gases will form a white plume in winter. Plume could obstruct window view.
Prevailing winds could freeze condensate and cause water/ice buildup on building,
plants or roof. Do not terminate vent in window well, stairwell, alcove, courtyard, or
other recessed areas.
Maintain Minimum Clearances below to prevent potential problems;
1. Vent must terminate at least 12 inches above grade, anticipated snow line or roof
surface (Canada 18” minimum).
2. Vent termination must be at least 7 feet above a public walkway.
3. Vent must be 3 feet above any forced air intake within 10 feet.
4. Vent must terminate at least 3 feet horizontally, from electric meters, gas meters,
regulators, relief valves, and other equipment, and in no case above or below, unless a
3 feet horizontal distance is maintained
5. Do not extend exposed vent pipe outside the building beyond recommended distance.
Condensate could freeze and block vent pipe.
6. Vent should terminate at least 3 feet away from adjacent walls, inside corners and
below roof overhang.
7. It is not recommended to terminate vent above any door or window, condensate can
freeze causing ice formations.
8. Do not use chimney as a raceway if another appliance or fireplace is vented into or
through chimney.
9. The exhaust vent must be pitched up toward the termination a minimum of ¼” in. per
foot. Condensate must flow back to the Boiler freely, without accumulating in the
vent.
10. Multiple boiler vent terminations; See Venting application.
Page 9
THROUGH THE ROOF PENETRATION — CONCENTRIC*:
1. Determine best location for vent/air termination using previous guidelines.
2. Cut a 5” hole to accommodate the 4½” diameter PVC pipe.
3. Cement termination concentric Y to 4½” diameter PVC pipe, then pass through roof
penetration and field supplied roof boot/flashing.
4. Secure assembly to roof structure with field supplied metal strapping or equivalent support
material.
5. Insert smaller 2½” PVC vent exhaust pipe into larger 4½” diameter combustion air pipe
ensuring PVC exhaust vent pipe is properly cement into concentric Y.
6. Cement vent exhaust pipe and air inlet pipe onto concentric vent termination.
7. Concentric vent termination cannot be extended beyond manufactured length.
8. Concentric vent termination may be cut to desired length.
9. Concentric vent shall terminate at least 12 inches above snow line but not more 24 inches
above roof surface. (see
FIG.4
and
FIG. 5
for details)
10. Operate heater through one complete cycle and check for flue gas leakage.
11. Refer to fig. 6 for multiple “Through the roof” installations and maintain a 12” center-to-
center distance.
* Buderus Part Number: BRYKGAVT0602CVT
E
XHAUST AND INTAKE AIR PLACEMENT
Page 10
Page 11
S
IDE-WALL PENETRATION (CONCENTRIC)
1. Determine best location for vent/air termination using previous guidelines (
FIG. 3A & 7
).
2. Cut a 5” hole to accommodate the 4½” diameter PVC pipe.
3. Cement termination concentric Y to 4½” diameter PVC pipe, then pass through wall
penetration and field supplied flashing if required.
4. Insert smaller 2½” PVC vent exhaust pipe into larger 4½” diameter combustion air pipe
ensuring PVC exhaust vent pipe is properly cement into concentric Y.
5. Cement vent exhaust pipe and air inlet pipe onto concentric vent termination.
6. Concentric vent termination cannot be extended beyond manufactured length.
7. Concentric vent termination may be cut to desired length.
8. Operate heater through one complete cycle and check for flue gas leakage.
9. Allow 8” center to center horizontal distance between concentric vent terminations with
multiple heater installations.
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