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Figure 51: Outdoor Reset Curve
II. Field Adjustable Boiler Operating
Parameters
MCBA control factory programmed operating parameters
will result in satisfactory operation under most conditions.
However, because all systems are different, there may exist
situations where boiler operation may be enhanced by
adjusting a few of these parameters in the eld. A total of
46 eld adjustable parameters are stored in the memory
of the MCBA control. By adjusting these parameters an
installer can ne-tune MCBA operation under different
elds conditions. Refer to Table 25 for the list of adjustable
parameters and their factory settings.
Parameters are numbered from “1” to “42-2”. Parameters
“1” thru “4” are accessible by anyone. Parameters “5” thru
“42-2” require an access code to be viewed and adjusted.
Parameters may be changed by:
• Using the keypad on the boiler as input device to
make adjustments.
• Using personal computer, hooked up to MCBA
control via the GPI PC Interface Kit (P/N 101152-
01), available from US Boiler, as input device to
make adjustments.
Additionally, either the keypad or the personal computer can
be used to obtain information about the boiler current status
and operating history.
A. Adjusting Parameters via Boiler Keypad
Entering the Access Code
1. With 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 - 6 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 entered, the menu tree will be expanded
to include the items shown inside the dashed lines
in Figure 52. 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.
NOTE: Access Code is not required for Parameters 1
thru 4.
Changing Parameters
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 it 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 dene some
of the fan speeds. For example, the maximum
CH fan speed is dened by Parameters 13 and
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
manufacturer.
•
After changing any parameters, carefully conrm proper boiler operation before leaving the installation
site.