Dunkirk 95M-200 User manual

PARAMETER GUIDE
95M-200 GAS-FIRED DIRECT VENT
MODULATING HOT WATER BOILER
P/N 240006105, Rev. 1.0 [04/06]
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WARNING
Revise boiler control parameters only if you
fully understand the purpose and result of
the changes. Tampering with the control
settings in this manual will void the warranty
and can result in unreliable operation, with
possible severe personal injury, death, or
substantial property damage.
WARNING
This document must only be used by
a qualified heating installer or service
technician. Read all instructions, including
the Installation Manual (P/N# 240006103), the
Control Manual and Operating Instructions
(P/N# 240006104), the User’s Information
Manual (P/N# 240006106), and this Parameter
Guide before attempting to program the
control, and be sure to perform all steps in
the order specified. Failure to comply could
result in severe personal injury, death, or
substantial property damage.
IMPORTANT: Installation must comply with local
requirements and with the National Fuel Gas
Code, ANSI Z223.1 for U.S. installations or CSA
B149.1 or B149.2 for Canadian installations.
DO NOT DESTROY THESE INSTRUCTIONS!!
Please read carefully and keep in a safe place
for future reference.

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PARAMETER GUIDE
P/N# 240006105, Rev. 1.0 [04/06] • Printed in USA • Made In USA
95-200M GAS FIRED DIRECT VENT MODULATING HOT WATER BOILER
The following defined symbols are used throughout
this manual to notify the reader of potential hazards of
varying risk levels.
DANGER
Indicates an imminently hazardous situation
which, if not avoided, will result in death or seri-
ous injury.
WARNING
Indicates a potentially hazardous situation which,
if not avoided, could result in death or serious
injury.
CAUTION
Indicates a potential hazardous situation which, if not
avoided, may result in minor or moderate injury. It
may also be used to alert against unsafe practices.
IMPORTANT: Read the following instructions com-
pletely before installing!!
TABLE OF CONTENTS
I Safety Symbols and Warnings.................. 3
II Overview of Control Parameters............... 4
III Parameter Explanations............................ 6
IV How To Set Parameters.............................. 11
V Parameter Reference Table...................... 12
VI Installing Gascom Software...................... 19
VII Using Gascom Software........................... 20
VIII MCBA Monitoring and Error Logs............. 21
IX Parameter Change Record....................... 22
Keep this manual near boiler
and retain for future reference.
I - SAFETY SYMBOLS AND WARNINGS

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II - OVERVIEW OF CONTROL PARAMETERS
BOILER CONTROL PARAMETERS
This manual includes detailed explanations of the
adjustable parameters. See Section III, “Parameter
Explanations,” for more information.
WARNING
Revise boiler control parameters only if you
fully understand the purpose and result of the
changes. Tampering with the control settings in
this manual will void the warranty and can result
in unreliable operation, with possible severe
personal injury, death, or substantial property
damage.
DEFAULT PARAMETER SETTINGS
1. The “Default Parameter Settings” table on the next
page lists the factory default settings for this boiler at
standard altitudes (up to 2000 feet). When in doubt,
always restore parameters to the default settings listed.
2. You can restore factory settings by loading the
parameter file supplied on the Gascom Software CD to
the boiler control as described in this instruction.
WHEN TO CHANGE PARAMETERS
1. Factory default settings will work for most applications.
There are situations, however, for which changes
are desirable or even mandatory (ex: multiple boiler
applications using the Honeywell AM (HAM) module).
2. Default boiler settings are satisfactory for most high-
mass systems (radiant slab, cast iron radiators, most
finned-tube radiation).
TYPICAL PARAMETER CHANGES
Outdoor Reset Applications: Outdoor reset operation
can sometimes be improved by adjusting parameters
4, 5, 6, and 7. Parameters 9, 10, and 11 might also
be modified. See “Parameter Explanations” for more
information on outdoor reset.
High Altitude Installations: No changes are necessary
for high altitude operation. The boiler automatically
derates input at a rate of 2% for every 1000 feet above
an elevation of 2000 feet. The boiler will also derate
relative to the calorific value of the gas being used.
See “Table 2: 95-200M High Altitude Derate Chart”
in the Installation Manual (P/N# 240006103) for more
information.
Fan Coil Systems: Systems using fan coil units
respond to heat input rapidly, and may require larger
differential settings for best performance. (See
“Parameter Explanations” for more information on
control differential and how to adjust.)
High-mass Systems: High-mass systems, such as in-
slab radiant and cast iron radiator systems, respond
slowly to heat input. The factory default settings will
work well for most of these applications.
DO NOT CHANGE THE FOLLOWING
WARNING
Failure to comply with the following could cause
equipment performance problems, resulting
in potential severe personal injury, death, or
substantial property damage.
Parameter 2: Do not set for continuous DHW
pump.
Parameters 13 and 15: Do not set higher than
values in the “Default Parameter Settings” Table
on the next page.
Parameters 17 and 19: Do not set lower than
values in the “Default Parameter Settings” Table
on the next page.
Parameters 24, 25, 26, and 27: Do not change
from default settings.
Parameter 32: Do not change from value of 0.
Parameter 33: Leave setting at 30° F for storage
tank DW applications.
Parameter 34 (First Digit): Do not change from
value of 0.
Parameter 34 (Second Digit): Set only at 0
(2nd CH circuit off) unless using a Honeywell
AM module. With HAM, set second digit to 4 (0
- 10 V analog on HAM capacity).
Parameter 35 (Both Digits): Do not change
either digit from default setting.
Parameters 37, 39, 40, and 41: Do not change.
For future use only.
Parameter 42 (First Digit): Do not change from
default value.
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DEFAULT PARAMETER SETTINGS ON GASCOM SOFTWARE AND BOILER DISPLAY
DO NOT CHANGE ANY PARAMETER UNLESS THE APPLICATION REQUIRES SPECIAL SETTINGS.
PARAMETER/DESCRIPTION GASCOM DISPLAY
1 T3 Set DHW 150°F 150
2 DHW System On 01
3 CH System On 01
4 T1 Top CH-Mode 180°F 180
5 T1 Foot CH-Mode 120°F 120
6 T4 Minimum 0°F 00
7 T4 Maximum 60°F 60
8 T4 Frost Protection -20°F -20
9 T4 Correction 0°F 00
10 T Blocking 60°F 60
11 Booster Time 30 Minutes 30
12 T Parallel Shift 10°F 10
13 Maximum Fan Speed CH 4600 rpm 46
15 Maximum Fan Speed DHW 4600 rpm 46
17 Minimum Fan Speed 2150 rpm 21
19 Ignition Fan Speed 4300 rpm 43
20 CH Postpump Time 0 Minutes 00
21 DHW Postpump Time 30.6 Seconds 03
22 CH Modulation Hysteresis On 4°F 04
23 CH Modulation Hysteresis Off 4°F 04
24 DHW Modulation Hysteresis On 4°F 04
25 DHW Modulation Hysteresis Off 4°F 04
26 DHW Detection Hysteresis On 4°F 04
27 DHW Detection Hysteresis Off 4°F 04
28 CH Blocking Time 10.2 Seconds 01
29 DHW Blocking Time 10.2 Seconds 01
30 DHW -> CH Blocking Time 30.6 Seconds 03
31 Modulate Back Difference T1 - T2 50°F 50
32 RMCI Address -01 -01
33 T Plus: Setvalue Additional For DHW 30 30
34 2nd CH-Circuit (1st Digit) 2nd CH-Circuit Off 00
34 CH Type (2nd Digit) Room Thermostat 00
35 DHW 3-Way Valve/Pump (1st Digit) Hot Water Pump 13
35 DHW Type (2nd Digit) Storage Tank w/out Tank
Sensor (NTC3) 13
36 Manual Fan Speed Negative 1% -01
37 PWM-Pump Level (1st Digit) 3 31
37 PWM-Pump Level (2nd Digit) 1 31
38 T Set Hold Boiler Warm 40°F 40
39 T Top For 2nd CH Circuit 70°F 70
40 T Foot for 2nd CH Circuit 50°F 50
41 T Hysteresis For 2nd CH Circuit 20°F 20
42 Pump Settings For CH & DHW 00 21
42 Minimum Off Cycle Not Active 21

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WARNING
Revise boiler control parameters only if you
fully understand the purpose and result of the
changes. Tampering with the control settings in
this manual will void the warranty and can result
in unreliable operation, with possible severe
personal injury, death, or substantial property
damage.
WARNING
This document must only be used by a qualified
heating installer or service technician. Read all
instructions, including the Installation Manual
(P/N# 240006103), the Control Manual and
Operating Instructions (P/N# 240006104), the
User’s Information Manual (P/N# 240006106),
and this Parameter Guide before attempting to
program the control, and be sure to perform all
steps in the order specified. Failure to comply
could result in severe personal injury, death, or
substantial property damage.
IMPORTANT: Installation must comply with local
requirements and with the National Fuel Gas Code,
ANSI Z223.1 for U.S. installations or CSA B149.1 or
B149.2 for Canadian installations.
OUTDOOR RESET OPERATION
Outdoor reset adjusts the supply water temperature
so the heat output from the heating units matches the
heat loss as the outdoor temperature changes. The
colder the outdoor temperature, the warmer the water
temperature, and vice versa.
The closer the heating unit output matches the heat loss,
the less the swing in the indoor temperature. You can
adjust control parameters to do this as shown below.
OUTDOOR RESET TERMINOLOGY
Outdoor Design Temperature (ODT): Outdoor
Design Temperature for the area, used to calculate
heat loss. (Use this value for T4 minimum.)
Balance Point Temperature: Outside temperature
at which building heat loss equals building heat gain
from solar and internal sources. At this temperature,
no space heating is required. (Use this value for T4
maximum.)
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Automatic Temperature Boost: Compensates
for required pick-up times and variations in heating
load requirements by automatically increasing set
point temperature when a call for heat exceeds a
specified time (Parameter 11).
PARAMETERS 4, 5, 6 & 7 (OUTDOOR RESET)
Fixed Temperature Operation: If boiler is operated
with constant outlet temperature (no outside
temperature sensor installed), set Parameter 4 as
described in this manual.
Outdoor Reset Operation: Parameters 4 to 7
determine the reset curve, as shown in Figure 1.
T1 is the boiler outlet water temperature. T4 is the
outside temperature.
T1 Top (Parameter 4) is the outlet water
temperature the boiler tries to maintain
whenever the outside temperature is less than
T4 Minimum (Parameter 6).
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III - PARAMETER EXPLANATIONS
FIGURE 1 - CONTROL MODULE PARAMETERS AND
OUTDOOR RESET CURVE
Outdoor Reset Example A
180°F
182°F
210°F
200°F
T4 Maximum
(Parameter 7)
T Blocking
(Parameter 10)
T1 Foot
(Parameter 5)
(No higher that 180°F )
(Auto rest limit setting - not adjusted)
(Manual rest limit setting - not adjusted)
Boiler shuts OFF when
(T1 Set is less than T Blocking)
T4 Minimum
(Parameter 6)
T1 Top
(Parameter 4)
T1 Top
Cooler Warmer
Setpoint Temperature T1
CoolerWarmer Outside Temperature °F
PARAMETER DETAILS
PARAMETER
NUMBER
PARAMETER
NAME
FACTORY
SETTING
ADJUSTMENT
RANGE
4T1 Top 180°F 68 - 182°F
5T1 Foot 60°F 60 - 140°F
6T4 Minimum 0°F -4 - 50°F
7T4 Maximum 60°F 60 - 78°F
10 T Blocking 60°F 32 - 140°F
(or “32” for Off)

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T1 Foot (Parameter 5) is the outlet water
temperature the boiler tries to maintain
whenever the outside temperature is higher
than T4 Maximum (Parameter 7).
When outside temperature is between T4
Maximum and T4 Minimum, the control
calculates a value for T1 Setpoint (T1 Set)
between T1 Foot and T4 Top.
The boiler may not operate all the way down
to T1 foot. Parameter 10 (T Blocking) sets a
minimum operating outlet water temperature.
If the calculated setpoint, T1 set, is less than T
blocking, the boiler shuts off.
Set Parameters 4 to 7 as needed for the desired
reset curve. Make sure to set parameters 4 and 6
so the outlet water temperature is at design water
temperature when outside temperature drops to
the ODT (outdoor design temperature).
PARAMETER 9 (T4 CORRECTION)
Location of the outdoor sensor may sometimes
cause the sensor to incorrectly detect outside
temperature.
You can set Parameter 9 to correct for this difference
(up to 9° F more or less) if you believe boiler
response needs to be improved. Set a negative
number to reduce the outdoor temperature reading,
a positive number to increase the reading.
PARAMETER 10 (T BLOCKING)
Use this parameter to set a minimum operating
boiler outlet water set point temperature.
When calculated set point temperature, T set, is
at or below T blocking the boiler shuts down (after
operating a post pump cycle).
To deactivate this parameter, set the value to 32.
SUGGESTED OUTDOOR RESET SETTINGS
T1 Top: Set to the required supply water temperature
when outdoor temperature is at or below ODT .
T1 Foot: Set so the drop in supply water temperature
results in the best match of heating unit output to
heat loss as the outdoor temperature rises.
T4 Maximum: Set to the balance point temperature
for the building (typically 65° F or lower).
T4 Minimum: Set to ODT.
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AUTOMATIC TEMPERATURE BOOST
If the target temperature happens to be too low for
the heating units to supply sufficient heat within
fifteen minutes (default setting), the control “boosts”
the target temperature until the supply water meets
the system’s needs.
Even if the reset parameters are optimized for the
application, use of setback thermostats or the need
for occasional cold start operation will require faster
recovery than provided by the normal calculated
supply water temperature because the curve
assumes steady-state operation.
Boost will not call for supply water temperature
setpoint greater than the value of Parameter 4 (T1
Top). There is no concern that temperature boost
would supply water too hot for low-temperature
systems, such as slab-type radiant heating. On
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FIGURE 2 - TYPICAL RESET CURVES
Setpoint Temperature T1, °F
Outdoor Reset Example A
182
210
50
70 60 50 40 30 20 10 0-10 -20
70
90
110
130
150
170
190
200
T4 Maximum Set at 60°F
T1 Top Set at 180°F
T4 Minimum Set at 0°F
T Blocking Set at 100°F
T1 Foot Set at 60°F
M/R Limit
A/R Limit
Boiler OFF
(T1 Set less than T Blocking)
Outside Temperature, °F
Setpoint Temperature T1, °F
Outside Temperature, °F
Outdoor Reset Example B
195
210
50
70 60 50 40 30 20 10 0-10 -20
70
90
110
130
150
170
190
200
T4 Maximum Set at 60°F
T Top Set at 190°F
T4 Minimum Set at -2°F
T Blocking Set at 40°F
T1 Foot Set at 60°F
M/R Limit
A/R Limit

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hybrid systems, with finned tube radiation and
radiant slab, provide additional low temperature
protection for the radiant portion of the system,
because Parameter 4 (T1 Top) is likely to be set
higher than on a radiant-only system.
IMPORTANT: Many slab-type radiant systems won’t
require boost. This function can be disabled with a
parameter setting of “0.”
BOOST OPERATION
In outdoor reset operation (outdoor sensor
connected), the boiler control automatically
increases the target outlet water temperature if a
call for heat exceeds a time equal to Parameter
11 (factory default of 30 minutes.
At each interval of Parameter 11 of a continuous
call for heat, the control module increases the
target temperature by 18° F.
The control module will continue increasing
target temperature until it reaches the value set
in Parameter 4 (T1 Top).
When the call for heat ends while target
temperature is “boosted,” the target temperature
1.
2.
3.
4.
drops about 2° F for each minute the thermostat
is open.
Range: 1-30 minutes
Factory Default: 30 minutes.
Deactivate automatic temperature boost by
setting to “0.”
MAXIMUM FAN SPEED
WARNING
Fan speed must be set within the limits supplied
by the factory (See the “Default Parameters
Table” in Section II). Setting limits above or
below these factory defaults would increase or
decrease boiler firing rate beyond the acceptable
limit, resulting in potential for severe personal
injury, death, or substantial property damage.
Parameters 13 and 15 can be set to limit the
maximum boiler firing rate. Boiler firing rate is
proportional to the fan speed, so reducing the
maximum fan speed reduces maximum input.
Reducing maximum fan speed will be helpful for
systems on which the boiler is oversized for either
space heating or DHW, or both.
5.
6.
7.
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FIGURE 3 - PARAMETER 11 (AUTOMATIC SUPPLY TEMPERATURE BOOSTER OPERATION)
Temperature Boost Operation (Typical): In this example, the boiler is operating in outdoor reset mode with a calculated setpoint tem-
perature of 130°F. The call for heat has lasted more than 10 minutes (value of Parameter 11) and supply temperature boost has occured.

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Maximum fan speed can be set separately for space
heating and DHW using Parameters 13 and 15.
PARAMETER 13 (SPACE HEATING MAX. FAN
SPEED):
Acceptable Range for Natural Gas and LP: 2150
to 4600 rpm (21 to 46 on boiler display).
NOTE: Boiler display shows fan speed in hundreds of rpm. A
value of 48 would mean a speed of 100 x 48, or 4800 rpm.
Factory Defaults: See the “Default Parameters
Table” in Section II of this manual.
If the boiler is oversized for space heating, you
can reduce the maximum fan speed during space
heating operation (Parameter 13) to limit the
maximum boiler input.
PARAMETER 15: DHW MAX FAN SPEED
Acceptable Range for Natural Gas and LP: 2150
to 4600 rpm (21 to 46 on boiler display).
NOTE: Boiler display shows fan speed in hundreds of rpm. A
value of 48 would mean a speed of 100 x 48, or 4800 rpm.
Factory Defaults: See the “Default Parameters
Table” in Section II of this manual.
If the boiler is oversized for domestic water
heating, you can reduce the maximum fan speed
during DHW operation (Parameter 15) to limit the
maximum boiler input.
MINIMUM FAN SPEED (PARAMETER 17)
WARNING
The fan speed must not be set below the value
as supplied from the factory (see the “Default
Parameters Table” in Section II). This would
reduce boiler firing rate below the acceptable
limit, resulting in potential for severe personal
injury, death, or substantial property damage.
PARAMETER 17 sets the minimum fan speed. Boiler
firing rate is proportional to fan speed, so increasing
the minimum fan speed increases the minimum firing
rate (low fire).
Parameter 17 sets the minimum fan speed for both
DHW and space heating modes.
Acceptable Range for Natural Gas and LP: 2150
rpm (21 on boiler display).
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NOTE: Boiler display shows fan speed in hundreds of rpm. A
value of 48 would mean a speed of 100 x 48, or 4800 rpm.
Factory Defaults: See the “Default Parameters
Table” in Section II of this manual.
IGNITION FAN SPEED (PARAMETER 19)
WARNING
The fan speed must not be set BELOW the value
as supplied from the factory (see the “Default
Parameters Table” in Section II). This would
reduce boiler firing rate below the acceptable
limit, resulting in potential for severe personal
injury, death, or substantial property damage.
PARAMETER 19 sets the fan speed during ignition.
Boiler firing rate is proportional to fan speed, so
increasing the minimum fan speed increases the
minimum firing rate (low fire).
IMPORTANT: Parameter 19 should only be changed
where required for high altitude applications.
Acceptable Range for Natural Gas and LP: 4300
to 4600 rpm (43 to 46 on boiler display).
NOTE: Boiler display shows fan speed in hundreds of rpm. A
value of 48 would mean a speed of 100 x 48, or 4800 rpm.
Factory Defaults: See the “Default Parameters
Table” in Section II of this manual.
DIFFERENTIAL (HYSTERESIS) SETTINGS
WARNING
Do not change the differentials (hysteresis)
for domestic hot water operation (Parameters
24, 25, 26, and 27). Always use only the factory
default settings for these parameters.
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BOILER FIRING RATE VS. RPM
% Rate BTUH RPM
Natural Gas LP Gas
40 80,000 2150 2150
50 100,000 2500 2450
60 120,000 3000 2925
70 140,000 3300 3300
80 160,000 3875 3650
90 180,000 4075 4000
100 200,000 4600 4600
NOTE: Results may vary depending on altitude of installation, gas
calorific value, and vent length.

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SPACE HEATING DIFFERENTIALS (PARAMETERS
22 AND 23)
The term “differential” is also referred to as
“hysteresis.”
Parameter 22 is the “On” differential. The water
temperature must be at least Parameter 22 less
than the calculated setpoint temperature for the
boiler to turn on.
Parameter 23 is the “Off” differential. When the
boiler is firing, the water temperature must rise at
least Parameter 23 above the calculated setpoint
temperature for the boiler to turn off.
See Figure 4 for an explanation of the “On” and
“Off” differentials of the boiler control. Note that the
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differentials are greater when a heat call starts or
stops, as shown. The differentials decrease with
time until they equal Parameters 22 and 23.
SETTING “OFF” DIFFERENTIAL (PARAMETER 23)
The factory default setting for Parameter 23 is 4°
F. This works well for most applications.
For low mass systems (fan coil), performance can
be improved by increasing Parameter 23. This
compensates for the quicker system temperature
response of low-mass systems.
When setting Parameter 23, make sure that
Parameter 23 plus Parameter 4 is not over 193° F
to avoid possible nuisance lockouts.
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FIGURE 4 - PARAMETERS 22 AND 23 (SPEACE HEATING ON AND OFF DIFFERENTIALS (HYSTERESIS))

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METHOD 1 – BOILER DISPLAY
Using the six buttons on the front of the boiler (below)
and the proper code, the boiler can be both monitored
and modified using the digital display.
Perform the following steps with the boiler powered on
and in standby [STBY] mode:
1. Press and hold the “STEP” button.
2. While holding the “STEP” button down, press and
hold the “MODE” button.
3. Hold both buttons down together for several
seconds until [CODE] appears on the display.
4. Release “STEP” and “MODE” buttons. [CODE]
will stay lit on on the display.
NOTE: If [CODE] is not displayed after several seconds, release
“STEP” and “MODE” buttons and press “MODE” several times
to return display to [STBY]. Then repeat step 2 again.
5. Press the “STEP” button once.
6. Adjust the number displayed to [C-05] by using
the “+” and “-” buttons.
7. Press the “STORE” button.
IMPORTANT: The boiler control will automatically
exit [CODE] mode after 10 minutes of no activity.
8. Press the “MODE” button several times until
[PARA] is displayed.
9. Press the “STEP” button several times until [P-
XX] is displayed. The XX represents the parameter
that will be changed. The parameter’s value will
then be displayed.
10. Use the “+” or “-” buttons to set the desired value.
11. Press the “STORE” button. Steps 9-11 can now
be repeated for additional parameter changes or
continue to step 12 to exit.
IV- HOW TO SET PARAMETERS
12. Press the “RESET” button to exit.
METHOD 2 – CONTROL INTERFACE KIT
Using the Control Interface Kit and a Windows 95 or
better based computer with an available serial port.
CONTENTS OF CONTROL INTERFACE KIT
GCI Communication Module with cables (allows
connection of a PC to the boiler control).
Gascom Software (provides computer-based user
interface with boiler control)
COMPUTER REQUIREMENTS
IBM-compatible PC running Microsoft Windows 95 or
better; an available serial port; and a CD-ROM drive
(to install Gascom Software onto the computer).
NOTE: Gascom Software will not work on a Macintosh Computer
or a computer with a non-Windows based operating system.
PURPOSES OF THE INTERFACE KIT
Modify control parameters when necessary.
Computer interface simplifies parameter change.
Monitor control operation. All boiler inputs can
be viewed on-screen in both text mode and in
real-time graphical display.
Troubleshoot boiler. Use Gascom Software to
download a log of error codes recorded by the
boiler control.
USING GASCOM SOFTWARE
See Sections VI and VII of this manual, “Installing and
Using The Gascom Software” .
USING PARAMETER FILES
The Gascom Software CD contains parameter files
for high altitude, Honeywell AM applications, fan-
coil systems and default boiler parameters. (See
“Setting Parameters With Gascom” for file listings
and procedures.)
IMPORTANT: After making changes to parameters,
record the changes made on the last page of this
manual and leave a copy with the boiler for future
reference.
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Para. Name
Range Boiler Display
Description
Gascom
Software
Boiler
Display
Display Position
1st 2nd 3rd 4th
1 T3 Set
Storage DHW:
68° to 158°F
Instantaneous
DHW:
104° to 150°
68 to 158
104 to 150 1 Setting
• T3 is the DHW temperature by an immer-
sion sensor.
• DO NOT CHANGE this parameter from
the factory setting. ( Boiler outlet water
temperature setpoint in DHW mode is de-
termined by adding Parameter 1 to Param-
eter 33.)
• If applied for instantaneous DHW opera-
tion (not recommended), set Parameter 35
for the correct configuration.
2 DHW System
DHW OFF 0
2 Blank Blank Value
• Parameter 2 determines whether DHW
heating is activated. The boiler will not op-
erate in DHW mode if this parameter is set
to “0” or “3”.
DHW ON 1
DHW OFF +
pump
constant
2
• WARNING- It is not recommended to
set this parameter to either “2” or “3” (con-
tinuous DHW pump). This could result in
a hazardous condition, because it causes
constant circulation between the boiler and
the DHW heater.
DHW ON +
pump
constant
3
3 CH System
CH OFF 0
3 Blank Blank Value
• Parameter 3 determines whether the boil-
er will operate in central heating mode.
CH ON 1
CH OFF +
boiler pump
constant
2• Select “1” to cycle the boiler circulator on
central heating calls.
CH ON +
boiler pump
constant
3• Select “2” or “3” to maintain constant boil-
er circulation operation.
4 T1 Top 68° to 182°F 68 TO 182 4 Setting
• Constant Boiler Temperature operation
(outside sensor not connected): T1 Top is
the target outlet water temperature at all
times.
• Outside reset (outside sensor connected):
T1 Top is the maximum water temperature
based on outdoor air temperature.
5 T1 Foot 60° to 140°F 60 to 140
Initial reading: • T1 Foot applies only in outdoor reset op-
eration.
P . 0 5
After 2 to 3 seconds: • T1 Foot is the minimum target tempera-
ture for all outside temperatures.
Blank Setting
6 T4 Minimum -4° to 50° -4 to 50
Initial reading: • T4 Minimum applies only in outdoor reset
operation.
P . 0 6
After 2 to 3 seconds: • T4 Minimum is the outside temperature at
which the target outlet water temperature
is at maximum.
Blank Blank Setting
7 T4 Maximum 60° to 78°F 60 to 78
Initial reading: • T4 Maximum applies only in outdoor re-
set operation
P . 0 7
After 2 to 3 seconds: • T4 Maximum is the outside temperature
at which the target outlet water tempera-
ture is at minimum.
Blank Blank Setting
V - PARAMETER REFERENCE TABLE

13
Para. Name
Range Boiler Display
Description
Gascom
Software
Boiler
Display
Display Position
1st 2nd 3rd 4th
8T4 Frost
Protection -22° to 50°F -22 to 50
Initial reading:
When outside temperature drops to this
number, the boiler circulator will run con-
stantly.
P . 0 8
After 2 to 3 seconds:
Blank Setting
9 T4 Correction -8° to 10°F -8 to10
Initial reading: Use this parameter to modify the outside
temperature reading if needed to correct
for outside sensor location. Use only if sen-
sor is providing a false reading.
P . 0 9
After 2 to 3 seconds:
Blank Blank Setting
10 T Blocking 32° (off)
34° - 140°F
32 (off)
34 - 140
Initial reading:
When the target outlet water temperature
is less than this setting, the boiler shuts
off.
P . 1 0
After 2 to 3 seconds:
Blank Setting
11 Booster Time
0
(no booster)
1 to 30
(minutes)
0 to 30
Initial reading: • If a call for heat causes the boiler to re-
main at high fire for a time equal to Param-
eter 11, the control module increases out-
let water temperature setpoint by 18°F. For
each additional Parameter 11 time the heat
call continues, the set point is increased
another 18°F (never exceeding Parameter
4 + Parameter 23 (hysteresis off))
P . 1 1
After 2 to 3 seconds:
Blank Blank Setting • To deactivate booster operation, set this
parameter to 0.
12 T Parallel
Shift 0 to 144°F 0 to 144
Initial reading: • The value of Parameter 12 reduces the
calculated setpoint temperature by the
amount set when the call for heat is from
outdoor temperature.
P . 1 2
After 2 to 3 seconds: • We recommend not changing this param-
eter from the factory default of 0 (no paral-
lel shift).
Blank Setting
13 Maximum fan
speed CH
NAT
2250 to 5200
LP
2400 to 5200
22 to 52 (100’s
of rpm)
24 to 52
(100’s of rpm)
Initial reading:
• Use this parameter to change the maxi-
mum boiler input for central heating (CH).
Never above default value .
P . 1 3
• When in central heating mode, the boiler
fan speed will not exceed this setting. In-
creasing fan speed increases boiler input;
decreasing fan speed decreases boiler in-
put.
After 2 to 3 seconds: • Never set below low fire setting or above
maximum value shown at left.
Blank Setting
15 Maximum fan
speed DHW
NAT
2250 to 5200
LP
2400 to 5200
22 to 52 (100’s
of rpm)
24 to 52
(100’s of rpm)
Initial reading:
• Use this parameter to change the maxi-
mum boiler input for domestic water heat-
ing (DHW)-NEVER above default value.
P . 1 5 • Boiler fan speed will not exceed this set-
ting in DHW mode. Increasing fan speed in-
creases boiler input; decreasing fan speed
increases fan speed decreases input.
After 2 to 3 seconds:
Blank Blank Setting •NEVER set below low fire setting or above
the maximum value shown at left.

14
Para. Name
Range Boiler Display
Description
Gascom
Software
Boiler
Display
Display Position
1st 2nd 3rd 4th
17 Minimum fan
speed DHW
NAT
2250 to 5200
LP
2400 to 5200
22 to 52 (100’s
of rpm)
24 to 52
(100’s of rpm)
Initial reading: • Use this parameter to increase the mini-
mum input of the boiler. Increasing fan
speed increases boiler input; decreasing
fan speed decreases input.
P . 1 7
After 2 to 3 seconds:
Blank Blank Setting • NEVER set below minimum value shown
at left.
19 Ignition fan
speed
NAT
2200 to 5200
LP
2200 to 5200
22 to 52
(100’s of rpm)
22 to 52
(100’s of rpm)
Initial reading: • Use this parameter to increase the mini-
mum input of the boiler during ignition.
• Increasing fan speed increases boiler in-
put; decreasing fan speed decreases input.
• SET ONLY at recommended (default) val-
ues.
P . 1 9
After 2 to 3 seconds:
Blank Blank Setting
20 Postpump
time CH
0
(10 seconds)
1 to 99
(minutes)
0 to 99
Initial reading:
Parameter 20 is the length of time the
boiler circulator continues to operate after
completing a central heating cycle.
P . 2 0
After 2 to 3 seconds:
Blank Blank Setting
21 Postpump
time DHW
0 to 306
seconds
0 to 30
(times 10.2
seconds)
Initial reading:
Parameter 21 is the length of time the
boiler circulator continues to operate after
completing a DHW cycle.
P . 2 1
After 2 to 3 seconds:
Blank Blank Setting
22
CH Modula-
tion differen-
tial ON
0 to 36°F 0 to 36
Initial reading: • Differential may also be referred to as
“hysteresis”
P . 2 2
After 2 to 3 seconds: •This is the temperature the boiler water
must drop below setpoint temperature to
turn the boiler on.
Blank Blank Setting
23
CH Modula-
tion differen-
tial OFF
0 to 18°F 0 to 18
Initial reading: • Differential may also be referred to as
“hysteresis”
P . 2 3
• This is the temperature the boiler water
must not must rise above setpoint temper-
ature to turn the boiler off.
After 2 to 3 seconds: • As outlet temperature increases, the con-
trol module reduces boiler input. If tem-
perature continues to rise with boiler with
minimum input, the boiler will shut down
when the temperature reaches setpoint
temperature plus Parameter 23.
Blank Blank Setting
24
DHW Modu-
lation differ-
ential ON
-2° to 54°F -2 to 54
Initial reading: • Differential may also be referred to as
“hysteresis”
P . 2 4 • This is the temperature boiler water must
drop below setpoint temperature to turn
the boiler on. Boiler outlet water setpoint
temperature is 180°F during DHW mode.)
After 2 to 3 seconds:
Blank Blank Setting
25
DHW Modu-
lation differ-
ential OFF
-6° to 54°F -6 to 54
Initial reading: • Differential may also be referred to as
“hysteresis”
P . 2 5 • This is the temperature boiler water must
rise above setpoint temperature to turn
the boiler off. (As outlet temp. increases,
the control module reduces boiler input. If
temperature continues to rise with boiler
at minimum input, the boiler will shut down
when the temperature reaches setpoint
temperature plus Parameter 23.)
After 2 to 3 seconds:
Blank Blank Setting

15
Para. Name
Range Boiler Display
Description
Gascom
Software
Boiler
Display
Display Position
1st 2nd 3rd 4th
26
DHW detec-
tion differen-
tial ON
-2° to 54°F -2 to 54
Initial reading: • Differential may also be referred to as
“hysteresis”
P . 2 6 • This parameter has no effect unless a
DHW sensor is used - not recommended
(use an aquastat instead).
After 2 to 3 seconds:
Blank Blank Setting
• This is the temperature the DHW water
must drop below DHW setpoint tempera-
ture to turn the boiler on.
27
DHW detec-
tion differen-
tial OFF
-2° to 54°F -2 to 54
Initial reading: • Differential may also be referred to as
“hysteresis”
P . 2 7 • This parameter has no effect unless a
DHW sensor is used - not recommended
(use an aquastat instead).
After 2 to 3 seconds:
Blank Blank Setting
• This is the temperature the DHW water
must rise above DHW setpoint tempera-
ture to turn the boiler off.
28 Blocking time
CH
0 to 306 sec-
onds
0 to 30
(times 10.2
seconds)
Initial reading: Parameter 28 is the minimum time be-
tween consecutive central heating cycles.
After a call for heat is satisfied, the boiler
will remain off for at least the blocking time
before starting another cycle.
P . 2 8
After 2 to 3 seconds:
Blank Blank Setting
29 Blocking time
DHW
0 to 306 sec-
onds
0 to 30
(times 10.2
seconds)
Initial reading: Parameter 29 is the minimum time between
consecutive DHW heating cycles. After the
DHW call for heat is satisfied the boiler will
remain off for at least the blocking time be-
fore starting another DHW cycle.
P . 2 9
After 2 to 3 seconds:
Blank Blank Setting
30 Blocking time
DHW to CH
1 to 306 sec-
onds
0 to 30
(times 10.2
seconds)
Initial reading: Parameter 30 is the minimum wait time af-
ter a DHW call before the boiler will start
on a call for central heating. If a DHW call
is satisfied and a central heating call starts,
the boiler will shut down and wait the block-
ing time before starting.
P . 3 0
After 2 to 3 seconds:
Blank Blank Setting
31
T1 - T2 dif-
ference for
modulating
back
10° to 72° 10 to 72
Initial reading: • If the difference between boiler outlet wa-
ter temperature (T1) and return tempera-
ture (T2) is larger than parameter 31, the
boiler is forced to low fire.
P . 3 1
After 2 to 3 seconds:
Blank Blank Setting • DO NOT set higher than factory defaults.
32 RMCI
address
-1
(RMCI off)
0 to 7 B87
(address)
-1
(RMCI off)
0 to 7
(address)
Initial reading:
DO NOT CHANGE this parameter. It is
intended for use with an RMCI 1400 inter-
face device, currently not available.
P . 3 2
After 2 to 3 seconds:
Blank Blank Setting
33
T Plus
(setvalue
addition for
DHW)
0° to 54°F 0 to 54
Initial reading: • Parameter 33 sets the target boiler out-
let water temperature in DHW mode. Add
parameter 33 to parameter 1 to determine
the target temperature
P . 3 3
After 2 to 3 seconds:
Blank Setting
• Factory default is 150°F for parameter
1 and 30° for parameter 33, for a total of
180°F as the DHW boiler outlet water tem-
perature.

16
Para. Name
Range Boiler Display
Description
Gascom
Software
Boiler
Display
Display Position
1st 2nd 3rd 4th
34
(1st
digit)
2nd CH
circuit CH
type
0 to 8
(see right) 0 to 8
Initial reading: First digit (2nd circuit):
• DO NOT CHANGE parameter 34 first dig-
it. Second central heating circuit operation
is not currently supported .
• 0 (2nd CH circuit off ) - No second CH
circuit operation (LEAVE AS IS)
• 1 (2nd CH circuit as slave)
• 2 (2nd CH as master)
• 3 (2nd CH circuit as slave, T set also by
potmeter) - 2nd heating circuit as slave,
with setpoint temperature with setpoint
temperature determined by potentiometer.
• 4 (2nd CH circuit as master, T set also by
potmeter) - 2nd heating circuit as master,
with setpoint temperature determined by
potentiometer.
• 5 (2nd CH circuit as slave, active during
HW) 2nd heating circuit as slave, during
DHW.
• 6 (2nd CH circuit as slave, active during
HW) - 2nd heating circuit as master, during
DHW .
• 7 (2nd Ch circuit as slave, T set also by
potmeter, active during HW) - 2nd heating
circuit as slave, during DHW, with setpoint
temperature determined by potentiometer.
• 8 (2nd CH circuit as master, T set also by
potmeter, active during HW) - 2nd heating
circuit as slave, during DHW, with set point
temperature dtermined by potentiometer.
P . 3 4
34
(2nd
digit)
CH Type 0 to 6
(see right) 0 to 6
After 2 to 3 seconds: Second Digit (CH Type):
• 0 (room thermostat) - Central heating
opertion controlled by room thermostat
• 1 (outside temperature) - DO NOT SE-
LECT - Central heating operation con-
trolled by outside sensor (not currently
supported)
• 2 (0 - 10 V analog on MCBA: Capacity)
- DO NOT SELECT - central heating boiler
input controlled with 0 - 10 V input to con-
trol module (not currently supported)
• 3 ( 0 - 10 v analog on MCBA: temperature)
- DO NOT SELECT - Central heating boiler
outlet temperature controlled with 0 - 10
vdc input to control module (Not currently
supported)
• 4 (0 to 10 V analog on HAM: capacity) -
Select this value when using HAM module
to interface with multiple boiler controller.
See HAM instructions.
• 5 ( 0 - 10 V analog on HAM temperature)
- DO NOT SELECT - Central heating boiler
outlet temperature controlled with 0 - 10
vdc input HAM module, but controls tem-
perature setpoint. See HAM instructions.
• 6 (+/- control) - DO NOT SELECT - Cen-
tral heating mode controlled with +/- input to
control module (not currently supported)
Blank Blank Digit
1
Digit
2

17
Para. Name
Range Boiler Display
Description
Gascom
Software
Boiler
Display
Display Position
1st 2nd 3rd 4th
35
(1st
digit)
3-Way Valve 0 to 2
(see right) 0 to 2
Initial reading: First digit (3-way valve):
• Control module readout: Initial reading -
P.35 (indicates Parameter 35) after 2 to 3
second, change the parameter setting:
Position 1,2 = blank
Position 3 = Parameter 35 first digit (3 way
valve or pump)
Position 4 = Parameter 35 second digit
(DHW type)
• DO NOT CHANGE Parameter 35 first
digit . 3 way valve operation is not currently
supported.
• 0 ( 3 way valve normally open) - Switch
to DHW from CH with normally open 3 way
valve
• 1 (hot water pump) - Use DHW circulator
in DHW mode
• 2 (3-way valve normally closed) - Switch
to DHW from CH with normally closed 3
way valve
P . 2 9
35
(2nd
digit)
CH type 0 to 9 (see
right) 0 to 9
After 2 to 3 seconds:
Second digit (CH type):
• 0 (instant water heater with NTC3) -
DO NOT SELECT - instantaneous water
heater with sensor ( not currently sup-
ported)
• 1 (instant water heater without NTC3) -
DO NOT SELECT - Instantaneous water
heater without sensor (not currently sup-
ported)
• 2 (storage tank with NTC3) -
DO NOT SELECT- Storage tank with sen-
sor (not currently supported)
• 3 (storage tank without NTC3) -
DO NOT SELECT - Storage tank with
aquastat
• 4 (instant water heater with NTC3 + anti-
condensing) -
DO NOT SELECT - Instantaneous water
heater with sensor; anticondensate mode
(not currently supported)
• 5 (instantaneous water heater
without NTC3 + anti condensing) -
DO NOT SELECT - Instantaneous water
heater without sensor; anticondensate
mode (not currently supported)
• 6 (storage tank with NTC3 + anticon-
densing - DO NOT SELECT - Storage tank
with sensor; anticondensate mode (not
currently supported)
• 7 (storage tank without NTC3 + anticon-
densing) - DO NOT SELECT - Storage
tank with aquastat; anticondensate mode
(not currently supported)
• 8 (plate heater exchanger) - DO NOT SE-
LECT - Plate heater exchanger (not cur-
rently supported)
• 9 (external heat request) -
DO NOT SELECT - External heat request,
from RMCI (not currently supported)
Blank Blank Digit
1
Digit
2

18
Para. Name
Range Boiler Display
Description
Gascom
Software
Boiler
Display
Display Position
1st 2nd 3rd 4th
36 Manual
fanspeed
-1 (auto op-
eration)
0 to 100 (%)
-1 (auto)
0 to 100 (%)
Initial reading: Use this parameter, if desired, to manually
set the boiler at a fixed input. The manual
operation will only continue for 15 minutes.
The control module then returns to auto-
matic operation.
P . 3 6
After 2 to 3 seconds:
Blank Blank Setting
37
(1st
digit)
37
(2nd
digit)
PWM level
CH-pump
1 to 4
(pump speed) 1 to 4
Initial reading:
This function is not currently supported.
P . 3 7
After 2 to 3 seconds:
Blank Blank Digit
1
Digit
2
38 T Hold
32
(feature off)
32 to 176° F
32
(feature off)
32 to 176
Initial reading: Parameter 38 sets minimum standby tem-
perature for boiler. If boiler outlet or return
water temperature is sensed at less than T
Hold, the boiler fires (without pump operat-
ing to bring temperature up to T Hold).
P . 3 7
After 2 to 3 seconds:
Blank Blank Setting
39
T6 Top
2nd CH
circuit
50 to 176° F 50 to 176
Initial reading: • This function is not currently supported.
• Sets max. target boiler temperature dur-
ing call for heat from 2nd CH circuit (same
function as T1 Top for first CH circuit).
P . 3 9
After 2 to 3 seconds:
Blank Blank Setting
40
T6 Foot
2nd CH
circuit
50 to 70° F 50 to 70
Initial reading: • This function is not currently supported.
• Sets min. target boiler temperature dur-
ing call for heat from 2nd CH circuit (same
function as T1 Foot for first CH circuit).
P . 4 0
After 2 to 3 seconds:
Blank Blank Setting
41
T6
Differential
2nd CH
circuit
2 to 54° F 2 to 54
Initial reading: • This function is not currently supported.
• T6 Differential is the differential (hyster-
esis) for call for heat from 2nd CH circuit is
master. Boiler starts when outlet tempera-
ture drops T6 Differential below target out-
let temperature.
P . 4 1
After 2 to 3 seconds:
Blank Blank Setting
42
(1st
digit)
42
(2nd
digit)
Special pump
CH/DHW
Low/Off cycle
0, 1, 2, or 3
(see right)
0
(feature off)
1
(feature on)
0 to 3
0 or 1
Initial reading: First digit (Special pump CH/DHW):
• 0 - NOT RECOMMENDED
Normal circulator operation for CH and
DHW
• 1 - NOT RECOMMENDED
Boiler circulator off on CH call for heat.
Normal circulator operation on DHW.
• 2 - RECOMMENDED SETTING
Boiler circulator normal operation. DHW
circulator 5-second delay before starting.
• 3 - NOT RECOMMENDED
Boiler circulator off on CH call for heat.
DHW circulator 5-second delay before
starting.
Second digit (Low/off cycle):
• If boiler continues firing at low fire for 3
minutes or longer, the boiler will begin
cycling like an on/off boiler, firing only
at low fire, for cycle times of 10 minutes.
• The boiler will return to normal (modulat-
ing) operation if the burner is either off or
on for at least 9 minutes.
P . 4 2
After 2 to 3 seconds:
Blank Blank Digit
1
Digit
2

19
In order to run the Gascom Software, it must be installed
on your computer from the supplied software CD.
NOTE: Gascom Software will not work on a Macintosh
Computer or a computer with a non-Windows based operating
system. You must be running Windows 95 or better on an IBM-
combatible PC!!
Gascom Software is owned by Honeywell International,
Inc., and is provided under license to ECR International
to configure and monitor the Honeywell MCBA controller
found in the 95M-200 Series Boiler. © 2006 Honeywell
International, Inc.
USING THE “CD AUTORUN” FEATURE
Insert the CD into your computer’s CD-ROM drive.
The “Gascom Setup Wizard” should appear on
your desktop. If this wizard does not automatically
appear, see the section at right titled “Manual
Installation.”
Click “Next.” You should now see the following
screen on your desktop. Do not change the folder
location where the program is to be installed.
Click “Next” to proceed to the “Confirm Installation”
screen.
1.
2.
3.
Click “Next” to begin the installation. The following
screen will appear when the software is installed.
Click “Close.” There should now be a shortcut
called “Gascom_v1.0” on your desktop and
you are now ready to configure the Gascom
Software. See Section VII for proper instructions
on completing this process.
MANUAL INSTALLATION
If the “CD Autorun” feature of the Gascom Software
does not work on your PC, insert the CD into your
computer’s CD-ROM drive and follow these steps to
manually install the program on your hard drive.
Double-click the “My Computer” icon on your
desktop and search for the CD-ROM drive icon or
the “Gascom Installer” icon with the letter of your
CD-ROM drive next to it in parentheses. It should
look similar to the image below.
Double-click the “Gascom Installer” or CD-ROM
icon to manually begin the installation process.
The “Gascom Setup Wizard” should appear.
Continue with Step 2 in the “CD Autorun” setup
(above) and then proceed to Section VII.
4.
5.
1.
2.
3.
VI - INSTALLING THE GASCOM SOFTWARE
CD-ROM Drive

20
! !
CONFIGURING YOUR GASCOM SOFTWARE
After successfully installing the Gascom Software, close
all windows on your desktop and use the “Gascom_
v1.0” shortcut to open the program. Once Gascom is
open for the first time, complete the following steps to
configure the software for your equipment.
Click on “Gascom” in the menu bar at the top of
the screen and then choose “Configuration.” A
dialog box titled “Gascom Configuration” will open
in the program window.
In the dropdown box to the right of “MCBA1400”,
choose “Standard HR7A60Hz.”
Then, in the dropdown box to the right of “Interface
Device,” choose “GCI232.”
Your choice for “Communication Port” depends on
the computer being used. Choose the available
serial port that you will connect the GCI Interface
module to. If you do not know the name of the
serial port that you will be using, you can often
find out by trial and error.
The “Gascom Directory” is the location on your
computer where the Gascom program is stored.
By default, it is “C:\Program Files\gascom\” as
shown at right. If you changed the location of
the folder, you may find it by right clicking on
the shortcut that was created on the desktop
and then choosing “Properties.” There is often a
“Target” or “Start in” listing that shows the location
of the file folder. Using the default settings, your
configuration screen should now look like the one
below.
The last entry in the configuration menu is the
“Access Code” field. Entering the correct code
in the location will allow access to Parameter
Numbers 5 to 42. An access code is not needed in
order to access parameters 1 to 4, monitor boiler
performance, or view the logged error codes.
THE ACCESS CODE WILL CLEAR AFTER THE
PROGRAM CLOSES.
1.
2.
3.
4.
5.
6.
VII - USING THE GASCOM SOFTWARE
SETTING PARAMETERS W/GASCOM SOFTWARE
Connect the GCI interface from the communications
kit to the serial port on the computer. Connect
the ribbon cable to the boiler control through the
connection on the front display panel. Plug in the
GCI power cord.
Make sure power to the boiler is on.
Start the Gascom program and go through
configuration if it has not already been completed.
If the configuration was done previously, click on
the “Parameters” menu and choose the option titled
“Read from MCBA.”
If the device is connected correctly and the correct
communication port is chosen, the following screen
will appear. This indicates that communication has
been established between the computer and the
control.
NOTE: The first four parameters are the only parameters
available to change unless an access code is entered under
the configuration menu.
WARNING
Entering the access code makes parameters
1-42 available for change. Do not change any
parameter not directly addressed by this manual.
Some parameters in this boiler control should
never be changed under any circumstance.
After making changes to parameters, record the
changes on the last page of this manual and leave
a copy with the boiler for future reference.
ACCESSING PARAMETERS 5 - 42
If access to parameters 5 - 42 is needed, choose the
“Configuration” option from the “Gascom” menu and
enter “05” in the access code box. Then click “OK.” All
available parameters (1 - 42) should now be visible.
1.
2.
3.
4.