Crown Boiler BWC Series Owner's manual

D E S I G N E D T O LE A D
Manufacturer of Hydronic Heating Products
P.O. Box 14818 3633 I. Street
Philadelphia, PA 19134
Tel: [phone] • Fax: [phone] • www.crownboiler.com
D E S I G N E D T O LE A D
BWC Series
Service Supplement for BWC Series
Boilers Equipped with Type III MCBA
WARNING
IMPROPER SETTING OF PARAMETERS CAN CAUSE UNRELIABLE OR UNSAFE OPERATION,
RESULTING IN PROPERTY DAMAGE, PERSONAL INJURY, OR LOSS OF LIFE:
• CHANGING PARAMETERS SHOULD ONLY BE ATTEMPTED BY A PROFESSIONAL HEATING
SERVICE TECHNICIAN.
• DO NOT CHANGE ANY PARAMETERS NOT DESCRIBED IN THIS MANUAL WITHOUT FIRST
CONSULTING THE FACTORY.
• AFTER CHANGING ANY PARAMETERS, CAREFULLY CONFIRM PROPER BOILER OPERATION
BEFORE LEAVING THE INSTALLATION SITE.
• THIS MANUAL IS INTENDED AS A SUPPLEMENT, NOT A REPLACEMENT, FOR THE
INSTALLATION MANUAL SUPPLIED WITH THE BOILER. SEE THE INSTALLATION MANUAL FOR
IMPORTANT INFORMATION NOT SHOWN IN THIS MANUAL.

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TABLE OF CONTENTS
I. Boiler Operating Parameters
A. Overview 4
B. Entering The Access Code 4
C. Changing Parameters 5
D. Field Adjustable Parameters 8
E. Communication, Fan Speed and Error Modes 10
II. GCI PC Interface
A. System Requirements 11
B. Connecting Hardware 11
C. Installing Gascom 11
D. Changing The MCBA Parameters With Gascom 13
E. Using Gascom To Monitor The MCBA 13
F. Reading the MCBA Error Log 13
III. Component Test Procedures
A. Flame Signal Check 14
B. NTC Temperature Sensors 14
Appendix A1 Factory Parameter Settings A1-1

4
I Boiler Operating Parameters
A. Overview
All BWC Series boilers are equipped with a microprocessor-based Honeywell control module called a “ MCBA”. This
control manages all boiler functions including flame supervision and modulation. A total of 46 field adjustable param-
eters are stored in the memory of this control. These parameters determine the exact operation of the MCBA under differ-
ent conditions.
Crown has tried to program parameters into the MCBA at the factory that will result in satisfactory operation under
most conditions. Because all systems are different, however, there are a few situations where boiler operation may be
enhanced by adjusting a few of these parameters in the field. Part I of this manual describes the parameters that may be
changed and the method for changing them.
Parameters are numbered from “1” to “42-2”. Parameters 1-4 are accessible by anyone. Parameters 5 through 42-2
may only be accessed by entering an access code. Parameters may be changed by either of two methods:
1) Using the keypad on the boiler
2) Using the GCI PC Interface Kit (PN 249905) available from Crown Boiler Company.
In addition to being used to change parameters, both the key pad and the GCI Interface can be used to obtain informa-
tion about the boiler’s current status and operating history. For more information on this see Section E or Part II for using
the keypad and the GCI Interface respectively.
WARNING
IMPROPER SETTING OF PARAMETERS CAN CAUSE UNRELIABLE OR UNSAFE OPERATION,
RESULTING IN PROPERTY DAMAGE, PERSONAL INJURY, OR LOSS OF LIFE:
• CHANGING PARAMETERS SHOULD ONLY BE ATTEMPTED BY A PROFESSIONAL HEATING
SERVICE TECHNICIAN.
• DO NOT CHANGE ANY PARAMETERS NOT DESCRIBED IN THIS MANUAL WITHOUT FIRST
CONSULTING THE FACTORY.
• BEFORE MAKING CHANGES, IT IS RECOMMENDED THAT INITIAL VALUES OF PARAMETERS
BE RECORDED SO THAT THEY CAN BE RESTORED IF OPERATION OF THE BOILER IS NOT AS
ANTICIPATED.
• AFTER CHANGING ANY PARAMETERS, CAREFULLY CONFIRM PROPER BOILER OPERATION
BEFORE LEAVING THE INSTALLATION SITE.
B. Entering the Access Code
Note: If access to only Parameters 1-4 is desired you do not need to enter the access code. Skip to Section (C).
Using the Boiler Keypad
1) With the boiler running, toggle the Mode key until you reach the (STBY) Standby mode.
2) Depress and hold the Step key and then quickly depress and hold the Mode key for 2 – 5 seconds until the display
reads (CODE). Release the Mode key, then the Step key. The display should show a ‘C’ followed by a random two digit
number.
3) Use the + or – keys to scroll to the number 05.
4) Press the Store key momentarily and watch for the display to blink twice. If the access code has been successfully

5
entered, the menu tree will be expanded to include the items shown inside the dashed lines in Figure 1.1. Access to
parameters 5 - 42 will be possible by following the instructions in Section C. After 15 minutes have passed without any
keys being pressed, access to the expanded menu will end and the access code will need to be reentered to regain access
to parameters 5-42.
Using the GCI PC Interface
1) If not already done connect GCI PC interface, and install the Gascom software as described in Part III of this manual.
2) Open the Gascom software.
3) Click on the Gascom menu at the top left corner of the screen
4) Click on “Configuration”. The Gascom configuration window will open.
5) Enter 05 in the Access Code field and click OK
C. Changing Parameters
Using the Boiler Keypad
1) Toggle the Mode key until you reach (PARA) Parameter mode.
2) Press the Step key to scroll through the parameters until you reach the desired parameter number.
3) Use the + or – key to scroll to the desired parameter setting.
4) Press the Store key momentarily and watch for the display to blink once. The parameter setting has now stored its
new value.
5) When using the keypad, all parameters show up on the boiler display as two-digit numbers. This creates the following
special situations:
a) Two parameters are required to define some of the fan speeds. For example, the maximum CH fan speed is
defined by Parameters 13 and 14; Parameter 13 defines the “thousands” and “hundreds” places and Parameter 14 de-
fines the “tens” and “ones” places. The ignition fan speed is only adjustable in increments of hundreds, so only one
parameter (19) is required to define it. IMPORTANT: Field adjustment of fan speeds is not recommended.
b) In some cases one two digit number defines two separate parameters. For example, if Parameter 34 is viewed on
the boiler display, the “tens place” is Parameter 34-1 (default value is 0) and the “ones place” is Parameter 34-2 (de-
fault value is also 0). As viewed on the boiler display, the factory set Parameter 34 will therefore appear as “00”. If
Parameter 34-2 is changed to accept a 0-10VDC reading from an AM-4 (see Section D), Parameter 34 will then read
“04” as viewed on the boiler display.
Using the GCI PC Interface
1) If not already done connect GCI PC interface, and install the Gascom software as described in Part II of this manual
and open the Gascom software.
2) Click on the “Parameters” menu on the top of the screen.
3) Click on “Read from MCBA”. After a few seconds, a list of parameters and their settings will appear on the screen.
Parameters which are not accessible are grayed out. If the access code has not been entered in the configuration screen,
this will include Parameters 5 - 42. Parameters 43 and above are always grayed out because they are inaccessible in the
field.

6
STEP + - STORE STEP + - STORE
+Short
Shows supply set point
when responding to call for
heat (Note 1)
c 180 1DHW reference
set point (Note 2)
68°F - 144°F
(Default Setting
135°F)
1 Supply water temperature 1.170
+Long Turn heating on/off c OFF 0 = Off 2 Return water temperature 2.135
-Short
Shows domestic hot water
reference set point
(Note 2)
d 134 1 = On 3 Reserved for Future Use 3.-22
-Long Turn domestic hot water
on/off d OFF 2 = Off +
continuous pump 4Outdoor sensor temp., if
used (Note 5) 4.-22
+ and
MODE Long Hold burner in high fire
(Note 3) H 180 3 = On +
continuous pump 5 Flue gas temperature 5.165
- and
MODE Long Hold burner in low fire
(Note 3) L 180 0 = Off 6 Supply water set point
temperature 6.180
+ and -Long Deactivate forced high or
low firing O 180 1 = On
STEP
and
MODE
Long
(Note 6)
Activates CODE MODE
(See Below) C _ _ 2 = Off +
continuous pump
3 = On +
continuous pump
Use of
Keys Duration Result Display Example 9 Reserved for Future Use 9. 0 0
RESET Short Reset or Unlocking A Reserved for Future Use A. -22
MODE Short Next Mode (Standby) StbY
STEP No Function
STORE Short Enter Code C 88
+Short Increase Code C 89
-Short Decrease Code C 87
+Continuous Fast Increase Code C 95
-Continuous Fast Decrease Code C 81
1) If outdoor sensor is connected, this temperature is the supply temperature setpoint when the outdoor temperature is 0°F.
2) "Domestic water reference set point" + 45°F = boiler supply set point when boiler is responding to a call for domestic hot water (default = 180°F).
3) Boiler will automatically resume modulation after 15 minutes.
4) Factory default settings are shown in bold.
5) If no outdoor sensor is connected, display reads "4.-22".
6) Depress and hold the STEP key and then quickly depress and hold the MODE key to activate CODE MODE.CODE MODE is active when the display shows a 'C' followed by a 2 digit random number.
7) Displays the last six error codes (1-6) beginning with the most recent error.
FIGURE 1.1: EXPANDED MENU TREE
USE MODE KEY TO TOGGLE BETWEEN MODES
(Mode returns to Standby from other modes if no key is pressed for 20 min.)
STANDBY MODE
(StbY )
INFORMATION MODE
(INFO )
PARAMETER MODE
(PArA )
5 thru 42 See Table 2.1 for description and
possible setttings
Value
Use of
Keys Duration
Use of Keys
Possible Settings
(Note 4)
DescriptionParameter
Not Used
Display
Example
Result Display
Example
Heat Zone
Saves new setting to MCBA. Display will Flash when STORE is released indicating that change
has been made
8
4
Supply set point
when responding
to call for heat
68°F - 190°F
(Default Setting
180°F)
Use of Keys
Rate of change in supply
water temperature °F/sec
Rate of change in return
water temperature °F/sec
7. 0 0
8. 0 0
Step
#
Toggle Between Steps 1 - A
Not Used
7
Toggle Between Parameters
2 DHW Zone
3
CODE MODE
(COdE )
Not Used
Increases Setting
Decreases Setting
4) Double-click on the desired parameter. A window will open with either a field or a pull down list of options will appear. Enter or
select the desired value for the parameter.
5) Click OK.
6) Repeat Steps (3) - (5) to change any other desired parameters.

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RESET Short Reset or Unlocking RESET Short Reset or Unlocking
MODE Short Next Mode (Error) MODE Short Next Mode (Standby)
STEP No Function STEP Short Next Error Data
(Note 7) 1 12
STORE No Function STORE No Function
+No Function +No Function
-No Function -No Function
FIGURE 1.1: EXPANDED MENU TREE (cont.)
USE MODE KEY TO TOGGLE BETWEEN MODES
(Mode returns to Standby from other modes if no key is pressed for 20 min.)
The data listed within the dashed boxed area is only accessible after the proper access code has been entered in Code Mode.
COMMUNICATION MODE W/ RMCI
(CONN )
FANSPEED MODE
(FAN )
ERROR MODE (History)
(ErrO )
Use of
Keys
4 995
Use of
Keys Duration Result Display
Example
Reserved For Future Use.
Duration Result Display
Example
7) After all parameters have been changed, click on the “Parameters” menu at the top of the screen and then click on “Write to
MCBA”. After a few seconds, the display on the boiler will blink. This indicates that the parameters are written to the control and
are in effect.

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D. Field Adjustable Parameters
Table 1.3 is a list of the parameters that can be adjusted in the field. Although it is physically possible to adjust
all of these parameters, the parameters that are shaded gray should not need to be adjusted in the field. In the
event that these parameters are changed by accident, they may be restored to their original factory values by referring
to Appendix A at the back of this manual.
A description of the parameters for which field adjustment is permitted is also included in Table 1.3. The three tasks
that will require changing of these parameters include:
1) Adjusting the target boiler supply temperature when responding to call from an indirect water heater - The default
IWH target supply temperature is 180F. Since most indirect water heaters have ratings based on 180F boiler supply
temperature, it should rarely be necessary to adjust this parameter.
2) Changing the boiler water reset curve - When an outdoor temperature sensor is connected to a BWC Series boiler,
the MCBA will adjust the target boiler supply temperature based on outdoor temperature when the boiler is respond-
ing to a call for central heat. Figure 1.2 is a graph showing the target boiler supply temperature as a function of
outdoor temperature. The curve shown in Figure 1.2 is that obtained with the factory set parameters. The shape of this
curve may be changed by changing Parameters 4, 5, 6, and 7 as shown in Figure 1.2. Refer to Part I Section C for the
procedure to change parameters.
If the outdoor sensor is not connected to the boiler, the target supply temperature is always defined by Parameter 4
when the boiler is responding to a call for central heat, regardless of the outdoor temperature. In this case, the settings
of Parameters 5, 6, and 7 are meaningless.
3) Allowing the boiler to accept an input from an AM-4 module - In some applications (particularly multiple boiler
installations) it may be desirable to allow an external control to directly manage modulation of the boiler. The op-
tional AM-4 module kit available from Crown permits the BWC to be modulated using a 0-10VDC signal supplied
by an external control (for more information on this, refer to the installation instructions supplied with the AM-4 kit).
In order for the boiler to accept the 0-10VDC signal, Parameter 34-2 must be changed from “0” (“Room Ther-
mostat”) to “4” (“0-10V Analog on AM-4: Capacity”). Once this parameter is changed, the boiler will ignore any
call from a thermostat connected across terminals 1 and 2 on the boiler. It will continue to respond to calls from the
indirect water heater thermostat.
Although Parameters 2 and 3 should be left at the factory settings of “ON”, it is relatively easy to change them by
accident (pushing and holding the “+” or “-” key while the boiler is in standby mode will change them). If the boiler
does not respond to a call from one or both thermostats, verify that Parameters 2 and 3 are both “ON”.
Figure 1.2 Adjusting Boiler Water Reset curve

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Table 1.3: Parameter Descriptions
PAR
NO. DESCRIPTION PURPOSE
1 T3set DHW
Factory set to 134F. This value plus 46F equals the target supply water temperature when the
boiler responds to a call from the indirect water heater thermostat. With 134F factory setting,
target supply temperature is 180F when boiler is responding to a call for DHW.
2 DHW system Factory set to "ON". Field change not recommended.
3 CH system Factory set to "ON". Field change not recommended.
4 T1top CH Mode
Maximum target supply water temperature when boiler is responding to a call for central
heating. When the outdoor air sensor is connected, this is the maximum supply water
temperature on the reset curve (see Figure 1.2). Note: Settings higher than 180F increase the
risk of nuisance safety limit activation (b19 errors). Factory set to 180F.
5 T1foot CH Mode When the outdoor sensor is connected, T1foot is the minimum supply water temperature (see
Figure 1.2). Factory set to 100F.
6 T4 minimum Outdoor temperature at and below which the boiler will operate at the maximum target supply
water temperature (T1top). See Figure 1.2. Factory set to 0F.
7 T4 maximum Outdoor temperature at and above which the boiler will operate at the minimum target supply
water temperature (T1 foot). See Figure 1.2. Factory set to 60F.
8 T4 frost protection
9 T4 correction
10 Tblocking
11 Booster time
12 Tparallel shift
13/14 Maximum fanspeed CH
15/16 Maximum fanspeed DHW
17/18 Minimum fanspeed
19 Ignition fanspeed
20 CH postpump time
21 DHW postpump time
22 CH modulation hysteresis on
23 CH modulation hysteresis off
24 DHW modulation hysteresis on
25 DHW modulation hysteresis off
26 DHW detection hysteresis on
27 DHW detection hysteresis off
28 CH blocking time
29 DHW blocking time
30 DHW -> CH blocking time
31 Modulate back difference T1 - T2
32 RMCI Address
33 Tplus: Setvalue addition for DHW
34-1 2nd CH-Circuit (1st digit)
34-2 CH Type (2nd digit)
This parameter determines what device initiates a call for heat. The factory setting is "0"
("Room Thermostat" when selected using Gascom). If an AM-4 module is used for external
modulation, this parameter is changed to "4" ("0-10V Analog on AM-4: Capacity" when
using Gascom). When this parameter is set to "4", it ignores any call for heat from a
thermostat connected to the boiler and instead responds to 0-10VDC signal connected to the
AM-4 (also see AM-4 instructions).
35-1 DHW 3-wayvalve or pump
35-2 DHW-type (2nd digit)
36 Manual fanspeed
37-1 PWM-pump level (1st digit)
37-2 PWM-pump level (2nd digit)
38 Tset hold boiler warm
39 Ttop for 2nd CH circuit
40 Tfoot for 2nd CH circuit
41 Thysteresis for 2nd CH circuit
42-1 Pump settings for CH and DHW
42-2 Minimum Off Cycle (2nd digit)
Field Change Not Recommended
Field Change Not Recommended
Field Change Not Recommended

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E. Communication, Fan Speed and Error Modes
In addition to providing access to all field adjustable parameters, entering the access code also provides access to
three additional mode menus using the boiler keypad. These are shown in Figure 1.1:
1) Communication Mode - This mode does not currently have any function.
2) Fan Speed Mode - Allows the user to view the blower fan speed (firing rate is determined by fan speed).
3) Error Mode - Pressing STEP while in Error mode allows the user to see the six most recent error codes.

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II GCI PC Interface
A. System Requirements
The GCI Interface requires a PC computer running a Windows 98/NT/2000 or XP operating system. In addition, the
PC must have an open serial port.
B. Connecting Hardware
1) Connect the serial cable from the GCI to the computer.
2) Plug in the GCI
3) Open the lower front jacket panel. Loosen the screws holding the control cover and swing down the control cover so
that the control compartment is open.
4) Connect the ribbon cable from the GCI into the open receptacle on the MCBA next to the ribbon cable from the boiler
display/keypad (Figure 3.1).
C. Installing Gascom
1) Gascom is the software for the GCI-PC interface. It must be installed on the PC in order to use the interface at all.
2) Insert the Gascom CD in your computer’s CDROM drive and wait a few seconds for the software to prompt you to
continue setup. Select “NEXT” to continue the installation. Follow the prompts to install the software. Crown highly
recommends accepting the default directories recommended..
3) The last screen allows the user to select whether or not to restart the computer. The computer must be restarted
prior to using the Gascom program.
4) Crown recommends the user register the software on the date of installation however registration is not required.
Registration gives the user access to our technical support personnel online as well as information about software up-
dates. To register the software click on the “Gascom Online” icon on the desk top and select “Registration”. You will
be asked to fill out a short form including your email address. Once the form is submitted a return email will be sent to
you confirming the information you entered along with your registration number.
5) Open Gascom by selecting the “Gascom 1.0” icon on the desk top. Before using the program for the first time it
must be configured properly to work with the BWC boiler and your computer. Go to the menu bar and select “Gascom”
and then “Configuration”. Refer to the menu tree shown in Figure 2.1.
a) From the drop down box labeled “MCBA1400” select the “Standard HR7A60Hz” option.
b) From the drop down box labeled “Interface device” select the “CGI232” option.
c) The “Communication port” setting is the serial port on the PC to which the GCI interface is connected. Most
often this serial port will be “COM1”.
d) The “Gascom Directory” field will contain the correct field and will not need to be changed as long as you
accepted all of the default file locations during installation. Otherwise, you will need to locate the Gascom
directory on your hard drive and enter the correct path name in this field.
e) If you wish to access Parameters 5 to 42 enter “05” in the “Access Code” field (the access code will need to be
entered every time the Gascom program is reopened).

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Standard HR7A60Hz
Interface device Communication port Gascom directory C:\Program Files\Gascom Access Code 05 (Service Code)
Load from file (F2) Save from file (F3) Read from MCBA (F4) Write from MCBA (F5) Load from file (F8) Save from file (F7) Monitor MCBA (Alt+F7)
Write parameters to the MCBA to activate new settings. Print the current parameter settings. Load the parameter table from the MCBA. Select or enter a filename to write parameters to.
MONITOR Select a previously saved file to monitor parameters from log.
Select or enter a filename to write a monitor log file.
Load from file Save from file Read from MCBA Clear in MCBA Print Configuration Print
Monitor an MCBA in real time. Customize the variables and colors you want to be displayed on the monitor screen. Print the current monitor screen. Close the monitor window.Close
Close
Clear the error table in the MCBA. Print the current error screen.
ERROR Select a file to view the error log.
Select or enter a filename to write an error log. Load the error table from the MCBA. Close the error window. Close the parameter window.
Note: You can switch between menus by using the 'F6' key.
GASCOM Configuration
MCBA1400
GCI232 COM1
Print Close
FIGURE 3.2: GASCOM SOFTWARE v1.0 MENU TREE
SettingItem
Select a file to load parameters from.
PARAMETER
Figure 3.1: GCI Ribbon Cable Receptical on MCBA
CONNECT GCI RIBBON CABLE
TO X7 OR X8 RECEPTACLE
(WHICHEVER IS OPEN)
X7
X8

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D. Changing The MCBA Parameters With Gascom
See Part I of this manual for instructions on changing parameters to the MCBA, not just the ones which were modi-
fied.
E. Using Gascom To Monitor The MCBA
From the Monitor Menu select “Monitor MCBA”. This will bring up a window which plots the following informa-
tion:
1) Temperatures:
Flow - Actual boiler supply temperature
Return - Actual Boiler return temperature
Outdoor - Temperature being read by outdoor sensor if it is connected. If it is not, temperature reading is “-22”.
Fluegas - Flue gas temperature
Set - Target boiler supply temperature
2) Status:
Room - Room thermostat (“1” = Calling, “0” = Not Calling)
Hotwater - Indirect water heater thermostat (“1” = Calling, “0” = Not Calling)
Pump - Heating circulator (“1” = On, “0” = Off)
Air-switch - Status of air pressure switch (“1” = Closed, “0” = Open)
Gaspressure - This is actually the status of the high limit (“1” = Closed, “0” = Open)
GasValve - Status of gas valve (“1” = Open , “0” = Closed)
Flame - Shows whether the MCBA detects the presence of the burner flame (“1” = Flame, “0” = No Flame)
DHW Pump - Indirect water heater circulator (“1” = On, “0” = Off)
3) RPM:
Fan - Actual speed of fan
Set - Target speed of fan.
F. Reading The MCBA Error Log
1) The MCBA keeps a log of the last six error codes. To view these error codes select “Read from MCBA” from the
Error Menu.
2) This data can be saved as a file to disk by selecting “Save to file” from the Error Menu or printed by selecting
“Print” from the same menu.
3) Error codes can also be removed from the memory of the MCBA by selecting “Clear in MCBA” from the Error
Menu.

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III COMPONENT TEST PROCEDURES
A. Flame Signal Check
1) The flame signal can be checked between terminal number 9 on the low voltage terminal strip and ground. A good
signal reading should be 6 VDC or greater.
2) If the signal is lower than 6 VDC, check the continuity of the ground wire between the ignitor and the junction box.
If the ground wire is suspect replace the ground wire.
3) If the ground wire is in good condition, remove the ignitor and inspect the ceramic insulator for cracks. If none
are found sand off any oxide deposits which formed on the electrode. If the insulator is cracked or the electrode can-
not be properly cleaned, replace the ignitor. When replacing the ignitor be sure to replace the ignitor gasket as well.
4) Other problems that can cause a low flame signal include:
• An improperly adjusted throttle (confirm that the CO2 is within the limits shown in the installation manual).
• Fouling of the burner (remove the burner and clean with compressed air).
• Low inlet gas pressure (verify that gas pressure is within the limits shown on the rating plate).
• Grounded 24VAC or sensor wiring (this problem will result in no flame voltage reading, but will normally not result
in an E02 error because there is still adequate flame current).
B. NTC Temperature Sensors
1) The supply, return, flue, and outdoor reset sensors used on the BWC are of the resistance type.
2) The Table 3.1 shows the range of resistance values for these sensors at various temperatures.

15
0 82304 89767 97227
5 71959 78310 84663
10 62144 67449 72755
15 53074 57443 61814
20 46557 50262 53966
25 40650 43770 46890
30 35665 38312 40960
32 33669 36129 38590
35 31370 33622 35874
40 27543 29443 31340
45 24387 26028 27670
50 21422 22804 24187
55 19107 20301 21494
60 16887 17906 18925
65 15073 15948 16823
68 13981 14773 15566
70 13407 14157 14908
75 11970 12616 13262
80 10710 11268 11826
85 9571 10048 10524
90 8611 9026 9441
95 7699 8054 8409
100 6965 7275 7585
105 6259 6526 6794
110 5668 5899 6129
115 5118 5319 5519
120 4636 4810 4984
125 4208 4359 4510
130 3815 3945 4074
135 3479 3591 3703
140 3155 3252 3350
145 2880 2974 3067
150 2617 2705 2793
155 2391 2475 2559
160 2181 2261 2340
165 1993 2069 2146
170 1825 1898 1971
175 1670 1739 1808
180 1519 1600 1682
185 1406 1467 1529
190 1297 1355 1414
195 1192 1247 1302
200 1100 1153 1205
205 1014 1064 1114
210 937 984 1032
212 906 952 999
Sensor Resistance Values
Temperature (°F) Minimum Value
(Ohms)
Nominal Value
(Ohms)
Maximum Value
(Ohms)
Table 3.1: NTC Sensor Resistance Values

A1-1
APPENDIX A. Factory Parameter Settings
BWC070 BWC090 BWC120 BWC150 BWC225EN BWC225EL
1 T3set DHW 134 134 134 134 134 134
2 DHW system
3 CH system
4 T1top CH Mode 180 180 180 180 180 180
5 T1foot CH Mode 100 100 100 100 100 100
6 T4 minimum 0 0 0 0 0 0
7 T4 maximum 60 60 60 60 60 60
8 T4 frost protection -22 -22 -22 -22 -22 -22
9 T4 correction 0 0 0 0 0 0
10 Tblocking 32 32 32 32 32 32
11 Booster time 0 0 0 0 0 0
12 Tparallel shift 0 0 0 0 0 0
13/14* Maximum fanspeed CH 4000 5000 5000 5000 5200 5000
15/16* Maximum fanspeed DHW 4000 5000 5000 5000 5200 5000
17/18* Minimum fanspeed 2200 2200 2200 1900 1800 1800
19 Ignition fanspeed 3000 3000 3000 3000 2500 3500
20 CH postpump time 0 0 0 00 0
21 DHW postpump time 10.2 10.2 10.2 10.2 10.2 10.2
22 CH modulation hysteresis on 10 10 10 10 10 10
23 CH modulation hysteresis off 6 6 6 2 2 2
24 DHW modulation hysteresis on 10 10 10 10 10 10
25 DHW modulation hysteresis off 6 6 6 2 2 2
26 DHW detection hysteresis on -8 -8 -8 -8 -8 -8
27 DHW detection hysteresis off 10 10 10 10 10 10
28 CH blocking time 0 0 0 0 0 0
29 DHW blocking time 0 0 0 0 0 0
30 DHW -> CH blocking time 0 0 0 0 0 0
31 Modulate back difference T1 - T2 54 54 54 44 44 44
32 RMCI Address -1 -1 -1 -1 -1 -1
33 Tplus: Setvalue addition for DHW 46 46 46 46 46 46
34-1 2nd CH-Circuit (1st digit)
34-2 CH Type (2nd digit)
35-1 DHW 3-wayvalve or pump (1st digit)
35-2 DHW-type (2nd digit)
36 Manual fanspeed -1 -1 -1 -1 -1 -1
37-1 PWM-pump level (1st digit) 4 4 4 44 4
37-2 PWM-pump level (2nd digit) 1 1 1 11 1
38 Tset hold boiler warm 36 36 36 36 36 36
39 Ttop for 2nd CH circuit 176 176 176 176 176 176
40 Tfoot for 2nd CH circuit 68 68 68 68 68 68
41 Thysteresis for 2nd CH circuit 10 10 10 10 10 10
42-1 Pump settings for CH and DHW
42-2 Minimum Off Cycle (2nd digit)
* First parameter defines "Thousands" and "Hundreds" places. Second parameter defines "Tens" and "Ones" places
0 (CH Normal Pump)
0 (Not Active)
Factory setting
DESCRIPTION
PAR
NO.
0 (2nd Heating Circuit Off)
1 (On)
1 (On)
0 (Room Thermostat)
1 (Hot Water Pump)
3 (Storage Tank without NTC3)

A1-2
Manufacturer of Hydronic Heating Products
P.O. Box 14818 3633 I. Street
Philadelphia, PA 19134
Tel: [phone] • Fax: [phone] • www.crownboiler.com
D E S I G N E D T O LE A D
PN: 980XXX
6/07