Overview Of Control Parameters - Dunkirk 95M-200 Parameter Manual

BOILER CONTROL PARAMETERS
This manual includes detailed explanations of the
adjustable parameters. See Section III, "Parameter
Explanations," for more information.
!
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"
II - OVERVIEW OF CONTROL PARAMETERS
!
WARNING
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
!
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.
4
!
WARNING