LP-743 Rev. 000 Rel. 000 Date 8.25.20
6
Table 2 - Critical cascade parameters to be configured at the Master boiler. See E. Complete Cascade Technical Menu Parameters for a complete list
of parameters.
Program the Cascade System (Followers):
The following parameters must be configured at the each Follower boiler (0.4.6 = b-FL1 - 7).
NOTE:
Set parameter 0.4.6 prior to adjusting other settings using the Establishing Boilers as Master and Followers procedure. Each Follower
must be set to a unique address, i.e., Follower #1 to b-FL1, Follower #2 to b-FL2, etc.
NOTE:
Menu level 34 is applicable to Follower #1 (0.4.6 = b-FL1); menu levels 35 to 40 are applicable to Followers #2 to 7 respectively. For
clarity, the follow table omits menu levels 35 through 40.
Parameter
Description
Value
Default Setting
0.4.6
Cascade Boiler Address (Follower boilers must be set to
b-FL1, 2 - 7)
UNDEF = undefined,
b-SIN = single boiler,
b-MAS = master boiler,
b-FL1 = Follower #1 boiler,
b-FL2 = Follower #2,
b-FL3 = Follower #3,
b-FL4 = Follower #4,
b-FL5 = Follower #5,
b-FL6 = Follower #6,
b-FL7 = Follower #7
b--SIN
34.0.1
DHW Preheating
0 = Disabled, 1 = Enabled
1
Enables / Disables DHW Comfort Function on WCN models (not applicable to WBN models) see par. 25.2.1.
NOTE:
When connected
to a cascade system, DHW Comfort Function is automatically turned on.
34.2.8
Combi Version -
WCN
Models
- DO NOT MODIFY
0 = Combi
0
Boiler Version -
WBN Models
Type of DHW control for Upstream IWH
1 = Storage with Tank Sensor
2 = Storage with Aquastat
2
Applicable when an Upstream IWH is connected directly to the individual Follower boiler. Not applicable for WCN models.
Parameter
Description
Value
Default Setting
4.2.5
Maximum CH Temperature Setting (Zone 1 – TT1)
68-122°F (when 4.2.0 = 0)
86-179°F (when 4.2.0 = 1)
120 (4.2.0 = 0)
179 (4.2.0 = 1)
Sets the maximum allowable boiler operating temperature for CH Zone 1, limiting Automatic Temperature Control and manual
adjustment from the User Menu. Refer to parameter 5.2.5 and 6.2.5 for CH Zone 2 and 3.
4.2.6
Minimum CH Temperature Setting (Zone 1 – TT1)
68-122°F (when 4.2.0 = 0)
86-179°F (when 4.2.0 = 1)
80 (4.2.0 = 0)
120 (4.2.0 = 1)
Sets the minimum allowable boiler operating temperature for CH Zone 1, limiting Automatic Temperature Control and manual
adjustment from the User Menu. Refer to parameter 5.2.6 and 6.2.6 for CH Zones 2 and 3.
25.1.6
System CH Pump Activation Logic
0 = System CH pump runs for CH and DHW
demands
1 = System CH pump only runs during CH
demands
0
For applications configured as illustrated in Figures 1 and 2, where the System CH pump must be off during DHW demands, configu-
re 25.1.6 = 1.
25.2.0
DHW Setpoint Temperature
97-140°F (Combi models)
104-140°F (Boiler models)
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.
25.2.2
System DHW Mode
(Applicable to Downstream IWH)
0 = CH Only
1 = Storage with Tank Sensor
2 = Storage with Aquastat
0
With 25.2.2 = 0, the Master boiler can be configured to heat an Upstream IWH connected only to the Master boiler. In this case,
choose the DHW activation device (Tank Sensor or Aquastat) via parameter 2.2.8.
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 defined 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 Shifting 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.
