AquaMAX EM50 Series - Manual (Page 5)

4
Single Element Model
This type of water heater has one heating unit with its own
thermostat. The heating unit is at the base of the water
heater and the unit can be connected to a continuous or
off-peak electricity supply. The thermostat is adjustable
between 60 ~ 75°C with a factory setting of 65°C (70°C for
EM50 models).
•
Continuous electricity supply
This type of connection is suited to where the storage
capacity is less than the normal daily usage.
•
Off-Peak electricity supply
This type of connection will only allow heating to occur
during set hours. A volume of water sufficient for the
day’s total use is heated and stored. This type of
heating will be more economical due to reduced tariffs
by the electricity authority.
Twin Element Model
This type of water heater has two heating units, each with its own
thermostat. One heating unit is at the base of the water heater and the
other near the top. The lower thermostat is adjustable between 60 ~ 75°C
(factory setting 70°C) whilst the top thermostat is fixed at 60°C.
•
Bottom heating unit (main heating unit)
During normal operation this heating unit supplies all
the hot water.
•
Top heating unit (booster)
This heating unit only operates during periods of high
demand to provide an additional supply of heated
water.
•
Electrical connection
The two heating units are wired for non simultaneous
operation so that only one heating unit can operate at a
time. The bottom heating unit is usually connected to an
Off-Peak (overnight) or time controlled electricity supply
and the top heating unit to a continuous supply. Some
electricity suppliers allow both heating units to be
metered at the Off-Peak or controlled tariff.
Note: Power must be available to the top heating unit circuit at all times for
this water heater to operate as designed.