LP-743 Rev. 000 Rel. 000 Date 8.25.20
2
Table of Contents
Part 1 - Cascade Water Piping
WARNING
!
Failure to follow the piping instructions in the installation manual WILL VOID the warranty and may result in property damage, severe
personal injury, or death.
Table 1 - Manifold Pipe Sizes in Inches – NOTE: The above pipe sizes are based on 20
o
F Delta and maximum water velocity between 5 - 6 ft/s
Model
Number of Units Cascaded
2
3
4
5
6
7
8
ELU-85WBN
1.25”
1.5”
2”
2”
2”
2.5”
2.5”
ELU-120WBN / WCN
1.25”
1.5”
2”
2”
2”
2.5”
2.5”
ELU-150WCN
1.25”
1.5”
2”
2”
2”
2.5”
2.5”
ELU-150WBN
1.5”
2”
2”
2.5”
2.5”
3”
3”
ELU-199WBN / WCN
1.5”
2”
2”
2.5”
2.5”
3”
3”
Model
Number of Units Cascaded
2
3
4
5
6
7
8
EFTU-85WBN
1.25”
1.5”
2”
2”
2.5”
2.5”
2.5”
EFTU-110WBN / WCN
1.5”
2”
2”
2.5”
2.5”
2.5”
3”
EFTU-150WBN / WCN
1.5”
2”
2”
2.5”
2.5”
3”
3”
EFTU-199WBN / WCN
1.5”
2”
2”
2.5”
2.5”
3”
3”
NOTE:
In piping applications utilizing a single zone, it is recommended that the installer use flow / check valves with weighted seats at or near
the appliance to prevent gravity circulation.
NOTICE
Figures illustrate the basic plumbing concept of a cascade installation. Primary / Secondary is required to provide adequate flow for the
secondary circuits.
WARNING
!
The piping will not support the weight of the circulators. Refer to the circulator manufacturer’s instructions to properly support the circulator.
Failure to comply with these instructions could result in property damage, severe personal injury, or death.
NOTES:
1. These drawings are meant to show system piping concept only. Installer is responsible for all equipment and detailing required by local codes.
2. Primary / Secondary Loop: All closely spaced tees shall be within 4 pipe diameters center to center spacing.
3. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream of all closely spaced tees.
4. The minimum individual boiler pipe size of DHW piping should be ¾” diameter and CH piping should be 1” in diameter.
5. Circulators are shown with isolation flanges. The alternative is standard flanges with full port ball valves. Purge valves can be used with circulator
flanges as an alternative.
6. Piping shown is Primary/Secondary.
7. Install a minimum of 12 diameters of straight pipe upstream of all circulators.
8. Unit is equipped with built-in primary pump.
This pump is sized to ensure proper flow rate through the boiler heat exchanger and related
piping provided the piping is done correctly.
9. IWH Applications - a mixing valve is recommended if the DHW temperature is set above 119
o
F.
On Boiler Only Heating Installation
Unless a boiler is connected to an Upstream IWH, cap the DHW fitting as indicated in the figures and disconnect the electrical
connection of the 3-way valve motor while the boiler is operating in central heating mode. This will lock the valve motor in central
heating mode and ensure freeze protection operates properly. Failure to disconnect the valve may disable boiler freeze protection
and result in property damage.
In mixed temperature applications, a mixing valve is required for the protection of low temperature loops.
Piping Figure Notes:
Part 1 - Cascade Water Piping
2
Part 2 - Cascade Control Set-Up
5
Part 3 - Cascade Wiring
7
Part 4 - Cascade Controls
9
A. Master Boiler Homescreen Overview
9
B. Follower Boiler Homescreen Overview
10
C. Technical Menu - Cascade Master Menu Structure
11
D. Technical Menu - Cascade Follower Menu Structure
12
E. Complete Cascade Technical Menu Parameters
13
Part 5 - Troubleshooting
19
Maintenance Notes
20
A maximum of eight (8) models may be installed in a cascade system. Installing more than the maximum amount of boilers in a cascade
system will result in system problems, property damage, and premature boiler failure. Such problems ARE NOT covered by product warranty.
