CFEWH SERIES 1-10 /20 | INSTALLATION Manual © February 2021 MicroHeat Technologies Pty LTD
Page
14
of
23
Preparation for use
After installation, this two-step procedure must be followed.
The unit must be primed
–
this is required only once
–
nominally at installation.
(Priming is
only
required when the electricity supply to the unit has been turned off/removed from the unit
–
for example, after a power failure or an isolation switch OFF condition).
Priming is required to set the unit up environmentally to ensure that the heating ramp-up time from start during
normal operation will be as short as possible, without incurring power overshoot.
Once primed, the unit will ramp-up to the optimised power required at the time without overshoot.
Note: Power overshoot typically results from the maximum power input required to get a heat exchanger up to
working temperature as quickly as possible.
However, as the unit does not incorporate a heat exchanger, this
initial power ‘kick’ is not required at start up.
STEP 1: Flush
•
Flushing is required to clear the unit of
plumbing debris that may have collected
in the piping during installation.
•
This is done with the electric power supply
turned off.
•
Flush water through the unit.
•
Flushing should be allowed to continue for
1 to 2 minutes.
•
After flushing remove the Inlet Filter (13)
from the cold water inlet, clean any debris
due to installation and flushing and refit.
STEP 2: Prime
•
Turn the electricity supply on
–
check for the LED (16) slow
fl
ashing
GREEN
. The unit is now in stand-by mode.
•
Turn on
the hot water faucet to a flow rate greater than 1.5ltr/min (the unit will start heating –
check
for LED
(16) fast flashing
GREEN
), and allow the unit to run for about 3 minutes.
NOTE: Priming mode
Depending on the initial flow rate during priming the unit will not start heating until approximately 1.2
Liters of water has cycled through the unit. This to ensure that any air in the system has been flushed.
Heating will have started once the LED (16) is fast
fl
ashing
GREEN
.
This will happen whenever the
electrical mains power is turned off to the system and ensures optimum performance.
The unit is now primed and ready for use.
