TSBC Instruction Manual Page 30 of 48
Configuration & Tuning
Setup Menu
No. Range / Choices Parameter and Description
30
Off
WWSD of Boiler
WWSD of Sys Pump
Both
WWSD
Specifies Warm Weather Shut-Down (WWSD) control of boiler and/or
system pump:
Off: Ignores Warm Weather setpoint.
WWSD of boiler: When Outside Air Temperature (OAT) is higher than
the WWSD setpoint, inhibits boiler start.
WWSD of Sys Pump: When OAT is higher than the WWSD setpoint de-
energize System Pump output (SO).
Both: When OAT is higher than the WWSD setpoint, inhibit
Call for Heat and de-energized system pump output
(SO).
31
50 to 100
% Maximum
Modulation Rate
LL Start Trigger
Specifies the percent of maximum modulation rate the running boiler(s)
must reach before calling upon additional boilers for help.
32
0 to 50
% Modulation Rate
LL Stop Trigger
Specifies the modulation rate that the running boiler(s) must be below
before shutting down a lag boiler.
33
0 to 900
Seconds
Boiler On Delay
Time Delay after On Point setpoint has been reached before starting the
next boiler. Short time delay to prevent nuisance starts due to momentary
temperature and modulation rate swings.
34
0 to 900
Seconds
Boiler Off Delay
Time Delay after the Off Point setpoint before stopping the next boiler.
Short time delay to prevent nuisance stops due to momentary temperature
and modulation rate swings.
35
1 to 30
Minutes
%FR On Delay
Time Delay after the modulation rate is above the LL Start Trigger before
starting the next boiler. Long time delay to avoid temperature going below
setpoint as a result of a slow process change.
36
1 to 30
Minutes
%FR Off Delay
Time Delay after the modulation rate is below the LL Stop Trigger before
stopping the next boiler. Long time delay to avoid temperature going above
setpoint as a result of a slow process change.
37
40 - 100
% Modulation Rate
High Fire Limit
To maximize high efficiency condensing operation, the firing rate is limited
to an adjustable value. The TSBC will keep the boilers at this firing rate or
lower as long as the boilers will handle the load. After the last boiler has
started the modulation rate is released up to 100%.
38
1 - 10
Degrees/Minute
Deg/Min Hold Off
Specifies a temperature rate of change that inhibits the next boiler being
started or stopped. If the temperature is increasing faster than this rate of
change the next boiler is not started. Also, if the temperature is decreasing
faster than this rate of change the next boiler is not stopped.
39
100 - 240
C or F
Cutback Setpoint
Boiler Outlet temperature above the Cutback Setpoint causes the
modulation rate to be reduced proportionally to help avoid a high
temperature limit lockout. This parameter is significant while the boiler is
controlled according to the remote system temperature sensor or remote
input (C+,C-) or Modbus (40006) Remote Firing Rate.
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