Hitachi RASM-2VRE Installation And Setup page 9

Optimisation for scald protection
at 50C which can be carried out by the heat pump in most circumstances. This avoids sys-
tematic use of the immersion heater and taking the hot water to a temperature which risks
scalds. If you choose this option then the tank temperature should be set at 50C to avoid le-
gionella growth.
In installer mode press the MENU button and then select SYSTEM CONFIGURATION and then
DHW
Set the settings up as follows
Status
Control
Maximum Setting T
Differential Temp
HP OFF differential T
HP ON differential T
Maximum Time
Cycle Time
El. Heater Wait Time
Space Priority Status
Anti Legionella
Optimisation for Legionella protection
than 50C normally but a weekly boost cycle will heat the cylinder to 60C to kill off any bacte-
ria. This requires the Yutaki unit to control an immersion heater in the cylinder.
If you choose this option then the tank temperature can be set between 45C & 50C
In installer mode press the MENU button and then select SYSTEM CONFIGURATION and then
DHW
Set the settings up as above except for the Anti Legionella setting. Set this up as
Status
Operation Day
Starting Time
Setting Temperature
Duration
If your customer has Solar PV then it may be good to select a legionella cycle during daylight
hours. If not then it is probably best to select a time when the hot water is unlikely to be
used. As standard this is set for Sunday at 1am.
Make sure at this point—
1. That the immersion heater is connected to the Yutaki unit terminals 30 & 31
2. That the immersion heater is enabled— Dip switch 4 pin 3 is ON
3. That the internal thermostat in the immersion heater is set to maximum
T: 0191 516 6554
entails setting the hot water temperature in the cylinder
Enabled
High Efficiency
52C
6C
5C
10C
40 mins
1 hour
20 mins
Disabled
Disabled
Enabled
Discuss with customer
Discuss with customer
60C
10 minutes
W: www.seconrenewable.com
allows the hot water temperature to be set lower
E:
Tries to
maintain
50C all of
the time
info@seconrenewables.com
Weekly
60C
Boost
from
45C