Options & Accessories

3
Cascading operation
6720811759 (2019/07)
1.2 Safety instructions
H WARNING:
Before installation,
▶ Read all instructions. Perform the
steps in the indicated sequence.
▶ Failure to comply with these
instructions can result in severe,
possibly fatal, personal injury as well
as damage to property and
equipment.
H DANGER:
Risk of electric shock!
▶ Ensure that only an authorized
contractor performs electrical work.
▶ Before performing electrical work,
disconnect the power and secure the
unit against unintentional
reconnection.
▶ Ensure the system has been
disconnected from the power supply.
H WARNING:
Risk of explosion!
For your safety
▶ Do not store or use gasoline or other
flammable, combustible or corrosive
vapors and liquids in the vicinity of
this or any other appliance.
H CAUTION:
Instruct the customer.
▶ Explain to the customer how the
appliance works and how to operate
it.
▶ Inform the customer that he/she must
not carry out any alterations or
repairs.
2 Cascading operation
Cascading allows up to twenty four appliances to be connected
in parallel. One of the appliances will serve as the controlling
primary appliance and will attempt to meet the hot water
demand. If the hot water demand is beyond the capacity of the
primary appliance, a signal is sent to one or more of the
secondary appliances to ignite. A cascading kit must be
installed for each secondary appliance included in the
installation.
Example: A 7 unit cascade installation includes 1 primary
appliance and 6 secondary appliances. 6 intelligent cascading
kits must be for this installation.
2.1 Plumbing set up
The plumbing should be connected in the reverse return
method with a minimum number of elbows to aid in balancing
pressures between the appliances.
Locating the appliances as close as possible improves
performance.
• Follow industry plumbing practices when installing multiple
appliances.
• Minimum pipe diameter: ¾"
• Minimum water pressure: 50 psi
• Maximum distance between appliances: 36"
• Insulate pipes to prevent heat loss.