Crown Boiler Bimini Buddy BB100H User manual

Bimini Buddy
NEAR-BOILER PIPING MODULE
INSTALLATION INSTRUCTIONS
Models:
BB100H•
BB100I•
BB100C•
WARNING: Improper installation, adjustment, alteration,
service or maintenance can cause property damage,
injury, or loss of life. For assistance or additional informa-
tion, consult a qualied installer, service agency or the
gas supplier.
Manufacturer of Hydronic Heating Products
P.O. Box 14818 3633 I. Street
Philadelphia, PA 19134
www.crownboiler.com
DESIGNED TO LEAD

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Table of Contents
I. Product Description 2
  II. Specications    2
III. Before Installing 6
IV. Location and Mounting 6
V. Boiler and System Piping 8
VI. BB100C Domestic Water Piping 14
VII. Wiring 16
VIII. Start-up 20
IX. Parts 22

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I. Product Description
The Bimini Buddy is a factory assembled near boiler piping module that is designed for use with Crown Bimini (BWC)
series boilers. The central component in this product is a hydraulic separator that is designed to assure that the minimum
requiredowthroughtheboilerisalwaysmaintainedregardlessoftheowthroughtheheatingsystem.Thisseparator
is also used for air removal as well as the connection point for the expansion tank. There are four versions of the Bimini
Buddy:
BB100H• - Provides hydraulic separation, air elimination, and expansion tank location for heat-only systems.
BB100I• - In addition to BB100H features, the BB100I is also equipped with a 120VAC three way diverting
valve that allows the boiler output to be directed to either the heating system or an indirect water heater.
BB100C• - In addition to BB100H features, the BB100C also includes a 120VAC three way diverting valve
that allows the boiler output to be directed to either the heating system or an integral plate heat exchanger for
domestichotwater(DHW)production.TheBB100Cisalsoequippedwithaowswitchtoinitiateacallfor
DHW production. DHW temperature is controlled by modulating the boiler supply temperature.
The Bimini Buddy has not been evaluated for use with any boilers not explicitly listed in Table 2.0.
II. Specications
Table2.0:BasicSpecications
Model BB100H BB100I BB100C
Compatible Boilers BWC070 , BWC090, BWC120, BWC151
Width (W), in. 12
Height (H), in. 19-3/4
Depth (D), in. 12-1/2
Weight, lbs 24 27 30
Max Expansion Tank Dia. (DM), in. 11
Maximum Operating Pressure 50 psi
Maximum Operating Temperature 200F
3-Way Valve Motor Rating 120VAC, 50/60Hz, 6.5W
(Energized for CH Demand)
Flow Switch Set-point 0.50 GPM
Flow Switch contact Ratings 20VA Pilot Duty at
120VAC

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FIGURE 2.1: Bimini Buddy (With Cover Installed )
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FIGURE 2.2: BB100H (Heat Only - Shown with Cover Removed)
D
H
W
DM
Expansion Tank
(Not Supplied)
Automatic
Air Vent
(Not Supplied)

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Table 2.3: Connections
Key Model BB100H BB100I BB100C
A From Boiler Supply 1” Copper
B To Boiler Return 1” MPT
C To System 1” Copper
D From System 1” Copper
E Expansion Tank/Fill 1/2” FPT
F Air Vent 1/2” FPT
G To Indirect Water Heater 1” Copper
H From Indirect Water Heater 1” Copper
I DHW Inlet Connection 1/2” MPT
J DHW Outlet Connection 3/4” MPT
Table 2.4: BB100C DHW Performance
Boiler Model
DHW Production (GPM) Approximate
Response Time (s)
Approx. DHW Set
point Range
77 Rise 90F Rise to 100F to 120F
BWC070 1.5 1.3 80 120 104 - 140
BWC090 2.1 1.8 70 100 104 - 140
BWC120 2.7 1.8170 90 104 - 140
BWC151 2.9 1.8170 90 104 - 140
Table 2.4 Notes:
At 90 degree rise, boiler input (and therefore DHW production) is reduced due to proximity of DHW outlet1.
temperature to maximum permitted target supply temperature.
Responsetimeistimerequiredtoreachspeciedtemperaturefroma“coldstart”withDHWinlettemperatureof2.
58F and a 1.0 GPM draw rate. Additonal time may be required to purge the piping between the Bimini Buddy and
thexture.

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FIGURE 2.6: BB100C (Combi -Shown with Cover Removed)
FIGURE 2.5: BB100I (Indirect Water Heater - Shown with Cover Removed)
Hydraulic Separator
3 Way Diverting Valve
Plate Heat Exchanger
DHW Flow Switch
A
B
C
D
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III. Before Installing
Before installing this product:
Verify that the planned installation will be in accordance with all local codes. In Massachusetts, the BB100C must1.
be installed by a licensed Plumber.
When using the BB100C, also verify that:2.
The domestic water output temperature, and response times shown in Table 2.4 will be acceptable.•
The domestic water hardness is less than 200ppm. If it is greater than 200PPM, do not use the BB100C without•
a water softener.
When installing a BB100I, make sure that the indirect water heater has a pressure drop less than that shown in Table3.
5.4attheowrateshown.
IV. Location and Mounting
Select a location for the Bimini Buddy that is as close as possible to the boiler.
The Bimini Buddy can be located further away from the boiler as long as the maximum piping lengths shown in Tables
5.2, 5.3, or 5.5 are not exceeded. Keep in mind, however, that the response time of the BWC100C to a call for DHW
will increase as the length of piping between the boiler and Bimini Buddy is increased.
If possible install the Bimini Buddy slightly above the boiler so that there are no down turns in the supply piping
between the boiler and the Bimini Buddy (Figure 5.0) so as to facilitate air removal. If this is not possible, install a screw
driver vent in the supply piping (Figure 5.1).
Provide the following clearances for servicing the Bimini Buddy:
Front: 24”•
LH Side: 6”•
RH Side 1”•
Top/Bottom:Asneededinordertoreplacetheeldsuppliedairventandexpansiontank.•
Theseclearancescanbereduced,howeverservicingtheBiminiBuddywillbecomeincreasinglydifcultastheyare.
Attach the Bimini Buddy to the wall using at last two suitable fasteners capable of supporting both it and the connected
pipingusingtheobroundslotsinthetopandbottomanges.
CAUTION
Drywall alone will not adequetly support the Bimini Buddy. Attach to studs or other framing.

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THIS PAGE INTENTIONALLY LEFT BLANK

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Figures 5.0 - 5.8 show basic Bimini Buddy Piping piping for all types of Bimini Buddies. Please note the following:
If the Bimini Buddy cannot be installed above the boiler as shown in Figure 5.0 (so that there are no down-turns1)
in the supply piping), install a screw driver vent in the supply piping for initial purging as shown in Figure 5.1.
MinimizetheamountofpipeandttingsbetweentheboilerandBiminiBuddy,andbetweentheBB100Iand2)
the indirect water heater:
Flow checks are not required in this piping and will only add unnecessary pressure drop.•
If isolation valves are installed on the system side of the hydraulic separator, there is little reason to also•
include them in the boiler piping. If isolation valves are installed in the boiler piping, use only full port ball
or gate valves.
If at all possible, avoid cutting the factory supplied system stubs (connections) on the hydraulic separator.3)
RecommendedllvalveconnectionisbetweenthehydraulicseparatorandexpansiontankasshowninFigure4)
5.0.
Flush the Bimini Buddy and system before connecting the boiler5)
ThehydraulicseparatorintheBiminiBuddyisdesignedtoassurethattheproperowrateismaintainedthroughthe
boilerregardlessoftheowratepresentintheheatingsystem.Evenso,thepipingbetweentheboilerandBiminiBuddy
(and between the BB100I and the indirect water heater) must be properly sized for the boiler and Bimini Buddy to work
properly. Size this piping as follows:
All piping between the boiler and the Bimini Buddy (and between the Bimini Buddy and the indirect water1)
heater on the BB100I) is 1” nominal pipe size. For BB100I installations, this is true even when the indirect
water heater itself has different connection sizes.
Refer to the appropriate Figure 5.6, 5.7, or 5.8 for the type of Bimini Buddy being installed. Determine the2)
length of all straight pipe on the planned installation that is shaded in the drawing.
Count the number of elbows that will be used in the planned installation in the piping that is shaded in the3)
illustration. Multiply the number of 1” elbows that will be used by 2.75ft per elbow. The result is the total
equivalent length of all elbows that will be used. Note: the equivalent length of the Tee, Cross, and Reducers
provided with the boiler do not need to be considered. Likewise, Unions, runs of Tees, and Full Port Ball or
Gate Valves can be treated as straight pipe.
CAUTION
Install Bimini buddy and boiler so that the gas ignition system components are protected from water •
(dripping, spraying, rain, etc) during appliance operation and service (circulator replacement, etc).
Install the boiler relief valve, and other boiler trim, as described in the boiler’s installation manual. •
Operation of a boiler in a system having frequent additions of make-up water can cause severe heat •
exchanger damage.
Do not use toxic additives, such as automotive antifreeze, in a hydronic system.•
Before connecting boiler, make sure that the system is free of sediment, ux and any residual boiler water •
additives. Flush the system if necessary to ensure that these contaminates are removed.
Do not use antifreeze or other chemicals that are not explicitly permitted by the boiler installation •
manual. See the boiler installation manual for for additonal important information on water chemistry
requirements.
V. Boiler and System Piping

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FIGURE 5.1: Installation Of Bimini Buddy at Same Level as Boiler Using Screw Driver Vent
FIGURE 5.0: Basic Bimini Buddy Field Piping (Bimini Buddy Shown Above Boiler to Faciliate Air Removal)
System Circulator
To Htg
System
From Htg
System
Boiler Relief
Valve
Drain Valve
Fill Valve
Expansion Tank
Boiler Circulator
Union
Automatic Air
Vent
Boiler Relief
Valve
Automatic
Air Vent
Fill Valve
Expansion Tank
Boiler Circulator
Drain Valve
Screw Driver Vent
System
Circulator
To Htg
System
From Htg
System

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Add the total equivalent length of the elbows determined in step 3 to the to the total straight pipe length4)
determined in Step 2. The result is the total equivalent length.
Refer to Table 5.2, 5.3, or 5.5 as appropriate for the type of Bimini Buddy being installed. Verify that the5)
equivalent length calculated in Step 4 is less than that shown for the combination of boiler, circulator, and
indirect water heater (BB100I only) being installed. In the case of the BB100I, the pressure drop through the
indirect water heater must be considered. The indirect water heater being used must have a pressure drop less
thanthatshowninTable5.3attheDHWowrateshowntoworkreliablywiththeBB100I.Table5.4shows
thepressuredropandowinformationforCrownindirectwaterheaters.Thesearegroupedby“class”andthat
class is shown in Table 5.4.
Table 5.2: BB100H (Heat Only) Maximum Equivalent Boiler Loop Length
Boiler Model Circulator Flow Rate
(GPM)
Max. Boiler Temp
Rise (F)
Pipe
Size
Max Equivalent Length of
Shaded Piping in Figure 5.6
BWC070 Taco 008 6.0 21 1” 179
BWC090 Taco 0014 8.0 20 1” 121
BWC120 Taco 0014 8.0 27 1” 152
BWC120 Taco 0014 9.0 24 1” 80
BWC120 Taco 0013 12.0 18 1” 37
BWC151 Taco 0014 8.0 34 1” 92
BWC151 Taco 0014 11.0 25 1” 54
BWC151 Taco 0013 14.0 19 1” 45
Table 5.3: BB100I (IWH) Maximum Equivalent Boiler/IWH Loop Length
Boiler
Model Circulator
CH Mode DHW Mode
Pipe
Size
Max
Equivalent
Length of
Shaded Piping
in Figure 5.7
Flow
Rate
(GPM)
Max.
Boiler
Temp
Rise (F)
Flow
Rate
(GPM)
Max. IWH
Pressure
Drop (ft
wc)
Indirect
Water Heater
Class in
Table 5.4
Note
BWC070 Taco 008 6.25 20 6.0 1.7 A 1 1” 79
BWC090 Taco 0014 8.0 20 7.5 2.6 A 1 1” 55
BWC120 Taco 0014 8.75 26 8.0 3.0 A 1” 37
BWC151 Taco 0014 9.25 29 8.0 5.0 B 2 1” 79
Notes:
“ClassA”modelsshowninTable5.4maynotachieveclaimedrsthourratingduetoinadequateboilerwaterow.1.
MS-79willnotachieveclaimedrsthourratingduetoinadequateboileroutput.2.
Some models shown in Table 5.4 have 3/4” boiler connections. These must be increased to 1” directly at the indirect3.
water heater connection.
Table 5.4: Crown Indirect Water Heaters
Indirect
Water
Heater
Class
Flow Rate
(GPM)
Max. IWH
Pressure
Drop (ft wc) Crown Indirect Water Heater Models
A
6.0
7.5
8.0
1.7
2.6
3.0
MS-26, MS-40, MSH-40, MT040GBR, MT050GBR, MT050GBR,
MT065GBR, MT080GBR
B 8.0 5.0 MS-40, MS-53, MS-79, MSH-53

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FIGURE 5.6: Boiler Loop Equivalent Length (Shaded) - BB100H
Table 5.5: BB100C (Combi) Maximum Equivalent Boiler Loop Length
Boiler
Model Circulator
CH Mode
Pipe
Size
Max
Equivalent
Length of
Shaded Piping
in Figure 5.8
Flow Rate
(GPM)
Max.
Boiler
Temp
Rise (F)
BWC070 Taco 008 6.75 19 1” 24
BWC090 Taco 0014 7.75 21 1” 30
BWC120 Taco 0014 8.00 29 1” 30
BWC151 Taco 0014 9.5 28 1” 30

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FIGURE 5.7 Boiler and IWH Loop Equivalent Length (Shaded) - BB100I

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FIGURE 5.8: Boiler Loop Equivalent Length (Shaded) - BB100C/BB100M

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z
Connect the domestic hot water piping as shown in Figure 6.0 for the BB100C. The components in this system and
their functions are as follows:
Mixing Valve/Anti-scald Devices1) (Required)-Athermostaticmixingvalvemustbeeldsuppliedforthe
BB100C.Wherethismixingvalveiseldsupplied,selectamodelthathasanadjustmentrangewhichallows
it to be set below 120F (Honeywell AM-1 or equivalent). If required, install additional anti-scald protection
devices in accordance with local codes. In the absence of any local Codes, install such devices as required by
the Uniform Plumbing Code (IAPMO UPC).
Flow Restrictor (Recommended)2) - If domestic hot water is drawn from the Bimini Buddy at a rate in excess of
theratinginTable2.4,thetemperatureofthehotwatermaybetoolowtobeofuse.Theuseofaowrestrictor
will prevent this problem by limiting the rate at which water can pass through the heat exchanger. If a restrictor
is used, select one having a rating in GPM approximately equal to that shown in Table 2.4.
Pressure Relief Valve (Required)3) - Limits the pressure in the domestic hot water piping. Use a valve designed
for DHW service, such as the Watts #3L or #53L. Note that this is a pressure relief valve, not a T&P valve.
Select a valve with a pressure setting less than or equal to 150 psi. Pipe the discharge to a safe location using
piping the same size as the discharge connection on the valve.
Hose Bib Valves (Recommended)4) -Thesevalvespermittheplateheatexchangerbeperiodically“backushed”
to remove sediment. The BB100M is equipped with plugs which can be removed and replaced with hose bib
valves when the heat exchanger is cleaned.
Globe or Ball Valve (Recommended)5) -UsedtoaidinbackushingtheheatexchangerandtoisolatetheDHW
pipingifitmustbeserviced.Inaddition,theupstreamvalvemaybeusedtolimittheDHWowifnecessary.
WARNING
Like all domestic water heaters, the BB100C is capable of generating water that is hot enough to cause
injury or death due to scalding. To minimize the risk of scalding:
Set domestic hot water (DHW) temperature as low as possible (see the Start-up Section of this •
manual for information on setting domestic water temperature.
Feel water before showering or bathing.•
If anti-scald or anti-chill protection is required, use devices specically designed for such service. •
Install and maintain these devices in accordance with the manufacturer’s instructions.
CAUTION
If the BB100C is connected to a water supply having a hardness in excess of 200PPM, scale may
prematurely form in the plate heat exchanger, signicantly shortening its life. If necessary, soften the
water upstream of the cold water connection to the Bimini Buddy.
VI. Domestic Water Piping (BB100C)

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FIGURE 6.0: BB100C Domestic Water Piping
Hose Bib
Valve
Hose Bib
Valve
DHW Relief Valve
(Max Setting 150 psi )
Backflow Preventer
Thermostatic Mixing Valve
(Not Supplied)
Ball or Globe
Valve
Flow Restrictor
Cold Water In
To Fixtures

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WARNING
Allwiringandgroundingmustbedoneinaccordancewiththeauthorityhavingjurisdictionor,intheabsenceof
such requirements, with the National Electrical Code (ANSI/NFPA 70).
VII. Wiring
This manual covers wiring the Bimini Buddy into BWC series boilers using having two different control systems:
Control Systems using Honeywell Type III MCBA• - This control system has been used on all BWC series
boilers manufactured between 2005 and late 2010. It uses an LED display.
Control Systems using Honeywell Sola• - This control system is being phased in during 2010 and is
distinguished by a Panasonic touch screen display.
Connecting BB100H to Type III MCBA Equipped boilers (Figure 7.0):1)
Connect the boiler circulator to the red lead and neutral (white) in the Boiler’s J-Box. If the system has a singlea.
system circulator, and the total combined current draw of the boiler and system circulators is less than 2.0A, the
system circulator can be wired in parallel to the boiler circulator. Otherwise, a relay (shown) or zoning panel
must be used to operate the system pump.
Connect the heating thermostat, or zoning panel boiler contacts, to terminals 1&2 on the boiler.b.
Connecting BB100H to Sola Equipped boilers (Figure 7.1):2)
Connecttheboilercirculatortotheterminalsmarked“BLRPump”intheboiler’sJ-Box.a.
Connectthesystemcirculatortotheterminalsmarked“SysPump”intheboiler’sJ-Box.b.
Connecttheheatingthermostat,orzoningpanelboilercontacts,tothe“CHStat”terminalsontheleftsideofc.
the boiler’s control compartment.
Connecting BB100I to Type III MCBA Equipped boilers (Figure 7.2):3)
Connect the boiler circulator hot to the red lead and neutral (white) in the Boiler’s J-Box.a.
Connect the three way zone valve in the BB100I to the blue lead and neutral (white) in the boiler’s J-box. Ifb.
the system has a single system circulator having a draw of less than 1.5A, the system circulator can be wired in
parallel with the zone valve (after reprogramming the MCBA per part G of this manual, the zone valve will be
powered during a call for heat). Otherwise, a relay or zoning panel must be used to operate the system pump.
The heating thermostat, or zoning panel boiler contacts, are connected to terminals 1&2 on the boiler.c.
The indirect water heater’s thermostat is connected to terminals 7&8 on the boiler. IWH thermostat contactsd.
mustbe“dry”.
Connecting BB100I to Sola Equipped boilers (Figure 7.3):4)
Connecttheboilercirculatortotheterminalsmarked“BLRPump”intheboiler’sJ-Box.a.
ConnectthethreewayzonevalveintheBB100Itotheterminalsmarked“DHWPump”intheboiler’sJ-Box.b.
Connectthesystemcirculatortotheterminalsmarked“SysPump”intheboiler’sJ-Box.c.
Connecttheheatingthermostat,orzoningpanelboilercontacts,tothe“CHStat”terminalsontheleftsideofd.
the boiler’s control compartment.
Connecttheindirectwaterheater’sthermostatto“DHWStat”terminalsontheleftsideoftheboiler’scontrole.
compartment.

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FIGURE 7.1: Wiring BB100H to Boiler equipped with Sola
FIGURE 7.0: Wiring BB100H to Boiler equipped with Type III MCBA
Heating T-Stat
LINE
BLR
PUMP
DHW
PUMP
SYS
PUMP
H N H N H N H N
Boiler
Circulator
System
Circulator
GND
GND
L1
L2
DHW
STAT
OD
SENS
HEAD
SENS
4-20
mA
AUX
LIMIT
CH
STAT
Low Voltage
Terminal Strip
Line Voltage
Terminal Strip
Line Voltage
Wiring
Low Voltage
Wiring
Boiler
Circulator
Relay 120 AC
(Field Supplied)
System Circulator
BWC J-Box
L1
L2
BK - Black
WT- White
R - Red
BL - Blue
Line Voltage Factory Wiring
Line Voltage Field Wiring
Heating T-Stat
123 4 5 6 7 8
Low Voltage
Terminal Strip
BL
R
WT
WT
BK
Low Voltage
Wiring
Line Voltage
Wiring
(N.O.)

18
19
Connecting BB100C to Type III MCBA Equipped boilers (Figure 7.4):5)
Connect the boiler circulator hot to the red lead and neutral (white) in the Boiler’s J-Box.a.
Connect the three way zone valve in the BB100I to the blue lead and neutral (white) in the boiler’s J-box. Ifb.
the system has a single system circulator having a draw of less than 1.5A, the system circulator can be wired in
parallel with the zone valve (after reprogramming the MCBA per part G of this manual, the zone valve will be
powered during a call for heat). Otherwise, a relay or zoning panel must be used to operate the system pump.
The heating thermostat, or zoning panel boiler contacts, are connected to terminals 1&2 on the boiler.c.
TheBB100M/BB100Cowswitchisconnectedtoterminals7&8ontheboiler.IWHthermostatcontactsmustd.
be“dry”.
Connecting BB100C to Sola Equipped boilers (Figure 7.5):6)
Connecttheboilercirculatortotheterminalsmarked“BLRPump”intheboiler’sJ-Box.a.
ConnectthethreewayzonevalveintheBB100Ctotheterminalsmarked“DHWPump”intheboiler’sJ-Box.b.
Connectthesystemcirculatortotheterminalsmarked“SysPump”intheboiler’sJ-Box.c.
Connecttheheatingthermostat,orzoningpanelboilercontacts,tothe“CHStat”terminalsontheleftsideofd.
the boiler’s control compartment.
ConnecttheBB100Cowswitchtothe“DHWStat”terminalsontheleftsideoftheboiler’scontrole.
compartment.
FIGURE 7.2: Wiring BB100I to Boiler equipped with Type III MCBA
Boiler
Circulator
BB100I 3-Way
Zone Valve
System Circulator
(Less Than 1.5 A )
BWC J-Box
L1
L2
BK - Black
WT- White
R - Red
BL - Blue
Line Voltage Factory Wiring
Line Voltage Field Wiring
Heating T-Stat
123 4 5 6 7 8
Low Voltage
Terminal Strip
BL
R
WT
WT
BK
DHW T-Stat
ZV
Line Voltage
Wiring
Low Voltage
Wiring