Service Manual
19
1 Service (continued)
Ramp Delay
Ramp Delay (Enable / Disable)
This parameter allows the installer to enable or disable the
SH ramp delay.
SH Ramp Delay
The SMART TOUCH CON•X•US Interface can be
programmed to limit the target firing rate for a fixed period
of time at the start of a space heating demand. There are six
(6) possible limits, each with their own time delay. The first
limit applies as soon as the burner starts. Once its time delay
expires, the second limit is applied and its timer begins. The
control steps through these limits until the 6th (sixth) limit
expires, at which point SH Ramp Delay will no longer limit
modulation.
Boiler Rate (%)
This parameter setting will define the minimum and maximum
modulation of the boiler during normal operation. Boiler
rate settings can be useful to limit high fire rate to increase
the run times to reduce short cycling or to limit turndown
for sites having minimum requirements for processing
temperatures. Note: When commissioning or servicing the
boiler, the minimum and maximum rate settings need to be
set to their lowest and highest settings, respectively. This
ensure the boiler has the full range of operation needed for
commissioning and servicing the boiler.
Menu
Parameter Name
(as shown on the LCD screen)
Min
Max
Default
Value Value Value
Ramp Delay Mode N/A N/A N/A
Step 1: Ramp Delay Time 0 40 2
Step 1: Ramp Delay Limit (%) LF 100 15
Step 2: Ramp Delay Time 0 40 1
Step 2: Ramp Delay Limit (%) LF 100 30
Step 3: Ramp Delay Time 0 40 1
Step 3: Ramp Delay Limit (%) LF 100 45
Step 4: Ramp Delay Time 0 40 1
Step 4: Ramp Delay Limit (%) LF 100 60
Step 5: Ramp Delay Time 0 40 1
Step 5: Ramp Delay Limit (%) LF 100 75
Step 6: Ramp Delay Time 0 40 1
Step 6: Ramp Delay Limit (%) LF 100 100
Table 1D Ramp Delay (This table lists control module parameters; use the sub-tab under the Setup tab to access
them.)
RAMP DELAY
SH Boiler Rate (%)
This parameter setting will define the minimum and maximum
modulation for space heat demand.
DHW Fan Rate (%)
This parameter setting will set the minimum and maximum
fan rates during hot water demands.
Note: Ramp Delay, Boiler Rate, SH Boiler Rate, or DHW
Fan Rate, all serve to limit the minimum and maximum rate
percentage settings, but they do not have assigned priorities.
The overall modulation rate is determined by mode (SH /
DHW / Ramp Delay / BMS / etc.,), system setpoint(s), and
boiler rate min/max limits in conjunction with the current
operating conditions which could require a higher modulation
rate to boost a weak flame signal or a lower modulation to
reduce temperatures to avoid tripping the Manual Reset High
Limit (MRHL).
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