Parameter Explanations - Dunkirk 95M-200 Parameter Manual

!
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.
!
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.)
III - PARAMETER EXPLANATIONS
!
WARNING
!
WARNING
• 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.
FIGURE 1 - CONTROL MODULE PARAMETERS AND
OUTDOOR RESET CURVE
Outdoor Reset Example A
210°F
(Manual rest limit setting - not adjusted)
200°F
(Auto rest limit setting - not adjusted)
182°F
T1 Top
180°F
(No higher that 180°F )
(Parameter 4)
T Blocking
(Parameter 10)
T1 Foot
(Parameter 5)
T4 Maximum
(Parameter 7)
Warmer
PARAMETER DETAILS
PARAMETER PARAMETER
NUMBER NAME
4 T1 Top
5 T1 Foot
6 T4 Minimum
7 T4 Maximum
10 T Blocking
• 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).
6
Boiler shuts OFF when
(T1 Set is less than T Blocking)
T4 Minimum
(Parameter 6)
Outside Temperature °F
FACTORY ADJUSTMENT
SETTING RANGE
180°F 68 - 182°F
60°F 60 - 140°F
0°F -4 - 50°F
60°F 60 - 78°F
60°F 32 - 140°F
(or "32" for Off)
T1 Top
Cooler