Cascade Set-Up - Lochinvar EFW 85 Installation, Commissioning, User And Maintenance Instructions

Cascade set-up

EFW water heaters and tanks can be installed cascaded in a number of possible combinations according to the
instructions below.
For the installation of cascaded water heaters and tanks always consult your supplier.
All requirements concerning pipe diameters and lengths and pump selection have to be calculated.
By doing so you'll improve the functioning and the life time of your HW installation.
Always use the Tichelmann system to connect multiple water heaters and/or tanks.
If the installation is constructed in such a way that under pressure (Pabs<1 bar; Patm<0 bar) can occur in the
tank, an aerator must be installed between the inlet combination and the tank, without any valve".
Standard scheme multiple water heaters and vessels
Notes:
1. Connections on the water heater side should always be executed as drawn in the picture above
(Tichelmann system).
2. Always apply safety components according to all applicable regulations.
3. To get a good mix of hot and cold water and therefore a better temperature arrangement of Water
Heater and Tank the Supply and Return pipe of the tank should preferably be situated in the bot-
tom 20% of the tank height.
4. In case of more than one tank, mount the tank sensor on one of the tank outlets. The temperature
of this tank will be assumed to be representative for all, provided that the installation design is cor-
rect.
5. Mount a strap-on system sensor close to the T-piece of the last tank as showed in the picture.
6. In the inlet (return) connection of the water heater no check valve is recommended.
7. If needed, the water heater control can handle up to twelve water heaters.
8. For large capacity installations consult your supplier.
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