LP-743 Rev. 000 Rel. 000 Date 8.25.20
14
25
2 DOMESTIC HOT WATER - Applicable for Downstream / System IWH
25
2
0
DHW Setpoint Temperature
WCN Models
97 - 140°F
125
DHW Setpoint Temperature
WBN Models
104 - 140°F
125
Establishes DHW temperature for the entire cascade system, including WCN boilers and Upstream IWH connected to individual
boilers. Not applicable to Downstream IWH when Master parameter 25.2.2 = 2, or to Upstream IWH connected to Follower
when parameter 34-40.2.8 = 2, or Master when parameter 2.2.8 = 2 (and 25.2.2 = 0). Also settable by pressing the DHW +/-
buttons from the home screen.
25
2
1
DHW Comfort Function (only applicable to WCN
Models)
2 = Always On
2
Comfort function keeps the DHW heat exchanger of a WCN boiler warm when a DHW demand is not active, thereby re-
ducing the amount of time needed to heat the hot water when a demand occurs. Function activates conditionally once
per Comfort Anti-Cycling Time, par 2.5.1 on the Master boiler, par. 34-40.5.1 on Follower boilers.
To deactivate DHW Comfort Function of a Master boiler set par 2.0.1 = 0. To deactivate DHW Comfort Function at a
Follower boiler set par 34-40.0.1 = 0.
25
2
2
System DHW Mode
0 = CH Only
1 = DHW Tank NTC
2 = DHW Tank Thermostat
0
25
2
3
Anti-Legionella Function
0 = Off
1 = On
0
25
2
6
System DHW Charging Priority
0 = Alternating
1 = Timed Concurrent / Alternating
2 = Concurrent
0
0 = Alternating – DHW and CH will not operate simultaneously. Priority switches between DHW and CH at an interval de-
fined by the CH/DHW Shifting Priority Time (parameter 25.0.8); first priority is DHW. If 25.0.8 = 0, then DHW has priority
indefinitely.
1 = Timed Concurrent / Alternating – DHW and CH operate simultaneously for the period defined by the CH/DHW Shi-
fting Priority Time (parameter 25.0.8). After the time elapses operation returns to Alternating until the end of the DHW
request.
2 = Concurrent – DHW and CH can operate simultaneously indefinitely.
25
2
7
DHW Modulation Setpoint
68 - 179
o
F
179
System target temperature during a DHW demand. Not applicable for WCN models.
25
2
8
DHW On Differential Temperature
0 - 36
o
F
0
Determines how much the DHW storage tank temperature can drop below target before initiating a DHW demand. Only
applicable when 25.2.2 = 1.
25
3 SYSTEM DIAGNOSTICS - READ ONLY
25
3
0
System CH Supply Setpoint
Actual calculated System CH Target temperature
25
3
1
System Supply Temperature (in
o
F)
Actual temperature read by System sensor
25
3
2
Outdoor Temperature (in
o
F)
Only with outdoor sensor connected
25
3
3
DHW Storage Temperature (in
o
F)
Only with NTC tank sensor connected and 25.2.2 = 1
25
3
5
System Pump Status
0 = OFF, 1 = ON
25
3
6
DHW Pump Status
0 = OFF, 1 = ON
25
4 CASCADE DIAGNOSTICS - READ ONLY
25
4
0
Cascade Power Level (in %)
25
4
1
Total Number of Cascaded Boilers
25
4
2
Available Cascaded Boilers
Does not count operating or locked out boilers
25
4
3
Active Cascaded Boilers
Boilers currently operating
M
enu
Sub
-M
enu
Par
amet
er
Description
Value
Default Setting