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Installation instructions
23
3.10
Electrical connections
The 2400 E requires an electrical power supply from a
120VAC / 60Hz circuit (with a dedicated outlet) and
must be properly grounded.
A means for switching off the 120VAC power supply
must be provided.
The heater is wired as shown in the wiring diagram
(chapter 7, Fig. 44).
3.11
Cascading function
Cascading enables the appliance to be connected in
parallel with up to 4 appliances. An appliance in this
system will only start, if it gets a signal from the
appliance before it. That means, the appliance works
always as a Master to the next appliance and always as
a Slave to the one before.
For more detailed information about this feature, consult
the instructions supplied with the accessory:
• 7 709 003 617.
3.12
Recirculation application
Since recirculation through the heater is not
permissible, the following drawing is provided to outline
a proper recirculation application using the Aquastar
water heater with an Ariston minitank water heater. This
schematic is for illustration only and must not be used
for actual installation without appropriate engineering
and technical advice from a properly licensed
professional in the locality where the installation is
made.
Fig. 27 Recirculation application
1
Full port isolation valve
2
Circulator
3
Check valve
4
PRV
5
Expansion tank
The use of a small electric mini-tank water heater (4-6
gallon size) should be used for this application and
designed so the pump will circulate the water through
the mini-tank and the building's hot water return loop
only. Timed or thermostatically controlled operation of
the pump is commonly done. The 2400 E must be
supplied with cold water only and plumbed in line
before the mini-tank water heater. Contact Bosch
Water Heating if further information is needed.
Warning:
For safety reasons,
disconnect the power supply cord to
the heater before any service or testing
is performed.
Warning:
This heater must be
electrically grounded in accordance
with the most recent edition of the
National Electrical Code NFPA 70. In
Canada, all electrical wiring to the
heater should be in accordance with
local codes and the Canadian Electrical
Code, CSA C22.1 Part 1. Do not rely
on the gas or water piping to ground the
metal parts of the heater.
Ariston Minitank
2400
E
