H E A T I N T E R F A C E U N I T
C O M M I S S I O N I N G
Page 26
H E A T I N T E R F A C E U N I T
C O M M I S S I O N I N G
Page 27
8.4.3 Powering up the HIU
Turn on the power to the HIU
DANGER
Electricity can cause serious and fatal injuries.
Always isolate the electrical supply and test
before commencing work.
8.4.4 Heating Set-up
Switch the heating ‘on’ at the thermostat /
programmer and check that the pump is
running, and that the motorised valve opens. If
the pump and the motorised valve do not open,
then check power to the HIU
Press the button on the face of the pump for
more than 2 seconds so that it enters setting
selection mode. The LEDs will flash, showing
the current setting mode. [Note that if the key
lock is disabled, the pump will not switch to
setting selection mode. In this case, unlock the
key lock by pressing the button for more than 10
seconds]
Once in setting selection mode, scroll through
the various options by quick depressions of the
button until the proportional pressure AUTO
ADAPT pattern below is displayed. Release the
button for more than 10 seconds to save the
setting
Check that no water is passing to discharge
through the safety valve
Attach a clip-on temperature sensor onto the
stainless-steel heating flow pipework, as close to
the plate as possible
Adjust the heating actuator until the design
temperature has been achieved and is steady for
three minutes
Complete the ‘Heating’ section of the
Commissioning sheet whilst the HTG is on
Switch the HTG ‘off’ at the room thermostat
and isolate the HIU at the fused spur
Close the secondary HTG isolation valves
WARNING
Risk of burns due to water release under high
pressure and hot surfaces can cause serious burns.
For all operations carried out on the HIU always
wear protective equipment.
COMMISSIONING FORM
IMPORTANT NOTE
Before commencement of
commissioning ensure that any
flushing bypass valves are closed
Dwelling Address:
Date:
Commissioning
Engineer:
Heat Interface Unit
Type:
Item:
Cert:
Heat Meter (if installed)
Product name:
Type / size:
Communication
modules:
Serial number:
Initial Reading:
/ (Qp)
(kWh)
Check the secondary side strainer, clean if
necessary and replace
Re-open the secondary heating isolation valves
and re-fill and re-pressurize the system, bleed air
if required
Restore electrical power to the HIU
8.4.5 DHW Set-up
Open either the kitchen sink DHW outlet or
any other outlet without a TMV or thermostatic
control. Using a measuring cap adjust the flow
rate to achieve a constant 12 l/m
Adjust actuator until the DHW temperature of
55° has been achieved at the outlet and is steady
for three minutes
Complete the ‘DHW’ section of the
commissioning sheet whilst the DHW is
running
SECONDARY READINGS
PRIMARY HEAT METER READINGS
Flow Temp
(°C)
Return Temp
(°C)
Flow Rate
(m³/h)
Flow Temp
(°C)
Return Temp
(°C)
Power
(kW)
HEA
TING
SECONDARY READINGS
PRIMARY HEAT METER READINGS
Location
(Tap DHW
Measured)
DHW Flow
Rate (l/m)
DHW Temp
(°C)
Flow Rate
(m³/h)
Flow Temp
(°C)
Return
Temp (°C)
Power (kW)
D
HW
