rinnai new Zealand Limited
E-Frost Solar Collector Split System
install manual: 11497-a
21
Supplementary boosting - electric
all rinnai storage cylinders come pre-equipped with electric elements and thermostats.
electrical connections
The cylinders are pre-wired. a 20 mm mounting hole for conduit
termination is provided under the element cover. a 2 way terminal
block is provided for connection of active and neutral wires
(pictured) and a brass terminal block is provided for connection of
the earth cable.
timer
To gain the most effective solar contribution the element is usually
controlled by a timer placed in the circuit as shown below. There are
a number of commercially available timers
1
, consult your electrical
supplier.
Ensure the timer contacts have sufficient rating to switch the load.
This will be approximately 15 amps for a 3600 Watt element.
1 Examples: merlin Gerin (1HP+1C 18 mm) or PdL 7 day Electronic Timer
Configuring the System to Protect for Legionella
G12/aS2 states that effective Legionella protection can be gained by heating the cylinder to at
least 60
o
C once a day, and the element is in the bottom 20% of the water tank (by volume)
and no more than 150 mm from the bottom of the tank.
To meet this requirement and provide a sufficient quantity of hot water for the customer, the
timer can be set to provide electricity to the cylinder from 9pm to 5am. This will ensure a full
tank of hot, Legionella free water every morning.
representation of how a timer would be set up in a circuit
