Installation / Operation Instruction Manual
Table Of Contents
- Brute MagnaTech
- Table of Contents. Page 1
- SECTION 1 General Information
- SECTION 2 Venting and Combustion Air
- SECTION 3 Gas supply and Piping
- SECTION 4 Water Flow and Headloss Data
- SECTION 5 Piping
- SECTION 6 Condensate Drain Trap
- SECTION 7 Electrical Connections
- SECTION 8 Control Operation
- 8.A The Home Screen
- 8.B Login to Lock / Unlock the Display Screen
- 8.C Quick Start
- 8.D Configuration
- 8.E Service Screens
- 8.F Messages and USB
- 8.G Active Demands
- SECTION 9 Parameter Tables
- SECTION 10 Initial startup Instructions
- SECTION 11 Maintenance
- SECTION 12 Troubleshooting
- SECTION 13 Replacement Parts
- 13.A General Information
- 13.B Component Illustrations, Parts Lists, and Part Numbers
- 13.B.1 Final Assembly, Part Numbers
- 13.B.2 Frame and Jacket Assembly, Part Numbers
- 13.B.3 Control Panel, Part Numbers
- 13.B.4 Air / Gas System, Part Numbers (Model 1600)
- 13.B.5 Air / Gas System, Part Numbers (Model 2000)
- 13.B.6 Air / Gas System, Part Numbers (Models 2500 & 3000)
- 13.B.7 Air / Gas System, Part Numbers(Models 3500 and 4000)
- 13.B.8 AC Distribution Box, Part Numbers (Model 1600)
- 13.B.9 AC Distribution Box, Part Numbers (Model 2000)
- 13.B.10 AC Distribution Box, Part Numbers (Models 2500 to 4000)
- 13.B.11 Inlet Waterway Assemblies, Part Numbers
- 13.B.12 Outlet Waterway Assemblies, Part Numbers
- 13.B.13 Gas Train Assembly, Part Numbers(Models 1600, 2000, 2500 and 3000)
- 13.B.14 Gas Train Assembly, Part Numbers (Models 3500 and 4000)
Page 72
1 2 3 4 5 6 7 8
30%
1 2 3 4 5 6 7 8
40%
1 2 3 4 5 6 7 8
20% 20%
1 2 3 4 5 6 7 8
40% 40%
1 2 3 4 5 6 7 8
27% 27% 27%
1 2 3 4 5 6 7 8
40% 40% 40% 40% 40% 40% 40% 40%
1 2 3 4 5 6 7 8
100% 100% 100% 100% 100% 100% 100% 100%
1 2 3 4 5 6 7 8
20% 20% 20% 20% 20% 20% 20% 20%
1 2 3 4 5 6 7 8
23% 23% 23% 23% 23% 23% 23%
1 2 3 4 5 6 7 8
20% 20% 20% 20% 20% 20% 20%
1 2 3 4 5 6 7 8
23% 23% 23% 23% 23% 23%
1 2 3 4 5 6 7 8
39%
1 2 3 4 5 6 7 8
20%
1 2 3 4 5 6 7 8
Low demand: The first boiler in
sequence ignites and gradually
increases firing rate to satify the heat
demand.
Continued decreasing demand: As
the demand decreases, once the
requested firing rate reaches the Drop
Load Value , the seventh boiler turns
off. This pattern continues as demand
continues to decrease until there is a
single boiler firing.
Increased demand: Once the first
boiler reaches the Base Load Value
(40%) firing rate, the second boiler
ignites. After ignition, both units
modulate to half of the cascade firing
rate, then gradually increase the firing
rate together, up to the Base Load
Value .
Lead/Lag - 4 up to 8 boilers
Decreasing demand: As the demand
decreases, once the requested firing
rate reaches the Drop Load Value , the
eighth boiler turns off.
Demand Satisfied: When the heat
demand is satisfied or the temperature
reaches the set point + off hysteresis,
the final boiler will turn off.
Increased demand: Once the first two
boilers reach the Base Load Value
(40%), the third boiler ignites. After
ignition, all three units modulate to 1/3
of the cascade firing rate, then
gradually increase firing rate together,
up to the Base Load Value . This
pattern continues as demand
increases.
Approaching max demand: Once all
eight boilers reach the Base Load
Value , all units are allowed to increase
firing rate (same at all boilers) up to
maximum firing rate.
Figure 39. Lead / Lag, Demand Increase, 4 to 8 Boilers
About Cascading (Lead / Lag) -continued