Section 5: Domestic Hot WaterPage 20
5.4.2 Setting
To set the timeswitch use the following procedure:
To set the time and day:
1. Press and hold down the ‘clock’ button throughout the ‘time and
day’ setting process.
2. Press ‘h+’ button repeatedly to set hour (24 hour clock).
3. Press ‘m+’ button repeatedly to set minutes.
4.
If you hold down either the ‘h+’ or ‘m+’ buttons for longer than
a second the figures in the display will scroll continuously.
NOTE
!
Press the ‘day’ button repeatedly to scroll through to required day
of week.
5. Release the ‘clock’ button. The clock is now running as indicated
by the flashing colon.
To set switching times:
You can set up to six ON and OFF commands per day, if required, as
follows:
1. Press the ‘timer’ button. The actual time will disappear from the
display. The first ‘ON’ indication will be displayed.
2. Press ‘h+’ button repeatedly to set hour (24 hour clock).
3. Press ‘m+’ button repeatedly to set minutes.
4. Press the ‘day’ button repeatedly to scroll through day options –
each single day, all weekdays, weekend and entire week.
5. Press the ‘timer’ button again. The first ‘OFF’ indication will be
displayed.
6. Repeat steps 2 to 4 (above) to set first OFF time – hours minutes
and day.
7.
Ensure that day (or days) for the OFF setting match those for
the ON setting.
NOTE
!
Press the ‘timer’ button again. The second ‘ON’ indication will be
displayed.
8. Repeat the above procedure to set second ON and OFF times,
if required.
9. After setting all required ON and OFF times – press the ‘clock’
button to return to current time display.
To check ON/OFF settings
Repeatedly press the ‘timer’ button to scroll through all ON and OFF
settings.
To change an ON or OFF setting
When a setting is showing on the display – press the ‘h+’ ‘m+’ or
‘day’ buttons to alter the setting as required.
To delete an ON/OFF setting period
1. Press the ‘timer’ button until the ‘ON’ setting for the period to be
deleted is displayed.
2. Press the ‘h+’ button repeatedly until ‘- -‘ appears (after 23
hours).
3. Press the ‘m+’ button repeatedly until ‘- -‘ appears (after 59
minutes).
4. Press the ‘timer’ button and the ‘OFF’ setting for the period to be
deleted is displayed.
5. Repeat steps 2 and 3 (above) to delete the ‘OFF’ setting.
6. Press the ‘timer’ button to save the amended command.
7. The deleted ON/OFF period is now available for re-programming
if required.
8. Press the ‘clock’ button to return to the current time display.
To override the timeswitch
If timeswitch is ON - press the ‘override’ button to set timeswitch to
OFF.
If timeswitch is OFF – press the ‘override’ button to set timeswitch to
ON.
The hot water controls must be ‘calling’ for this switch to bring
the immersion on.
NOTE
!
Operation
With the Automatic DHW Boost Kit 2 fitted, the HW cylinder thermostat
should be set to between 50 and 55°C for optimum operation. When
the heat pump raises the cylinder to this temperature the cylinder
thermostat will be ‘satisfied’ and switch to the ‘make on rise’ or
‘normally open’ connection.
The HW zone valve, being no longer fed from the cylinder thermostat,
will close.
The resulting switched live from the normally open contact of the
cylinder thermostat supplies power to terminal 3 on the Boost Kit
timeswitch. See Figure 5-4.
When the timeswitch contact closes, at the pre-set time, the output
from terminal 4 of the timeswitch energises the contactor coil, closing
the contactor contacts and connecting the output from the Immersion
heater switch to the immersion heater.
If, whilst the immersion heater is in operation, hot water is drawn
off and the temperature in the cylinder falls to below the cylinder
thermostat setting, the cylinder thermostat will operate and interrupt
the power supply to the Boost kit and the immersion heater will stop
operating.
In this case the heat pump will receive a HW demand to operate, to
heat the HW cylinder.
If the amount of hot water drawn off is small, the temperature drop
in the cylinder may be minimal and the cylinder thermostat may not
detect it.
In this case the cylinder thermostat will continue to supply power to
the Boost kit. The Immersion heater will continue to operate and no
HW demand will be sent to the heat pump.
IMPORTANT
There must be a demand from the HW channel of the heating/hot
water programmer for the Automatic DHW Boost Kit 2 to operate
when required. When setting the ON periods on the Auto Boost
Kit timeswitch, ensure that they are within a HW ON period on the
programmer.
Two separate power supplies are connected within the HW
boost kit enclosure – one from the immersion heater switch
and the other from the heating controls circuit. Ensure that
BOTH supplies are isolated before commencing any work on
the boost kit relay or switch.
A warning label informing the user of this has been fixed on the
enclosure.
THIS LABEL MUST NOT BE REMOVED FROM THE
ENCLOSURE.
!
WARNING
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