Commissioning; General; Checklist Before Commissioning; Commissioning Procedure - Heatrae Sadia HI-MAX INSTANT ID 5-60 Installation, Operation And Maintenance Manual

7. Commissioning

7.1 General

After fl ushing and fi lling the installation with water, as
set out in the previous section, please carry out the
following pre-commissioning and commissioning steps
to complete the installation of the unit.

7.2 Checklist before commissioning


Check all water connections for leaks and rectify as
necessary.

Turn off mains water supply using the stop cock.

When fi tted remove the pressure reducing valve
cartridge to access the strainer mesh, clean as
necessary and re-fi t (see the example in Figure 54).

Turn the water supply back on.

Manually open the safety valve (and expansion relief
valve if fi tted) checking that water is discharged
and runs freely through the tundish and out at the
discharge point. Check all joints in the discharge
pipework for leaks and rectify as necessary.

Ensure that the safety valve(s) reseats satisfactorily.

Check community heating fl ow strainer.

Ensure that any heating zone valves are in the auto
position.

Ensure all isolation valves linked to the community
heating system are now open.

Check all wiring is correct and connections are
secure in the terminals.

Check that the programmable room thermostat(s)
is/are fi tted and wired correctly back to the
controller.

Check that pipes have been earth bonded.

Check that the pump and valves are all plugged in.

Ensure that all sensors are connected and in their
relevant pockets.

Check any air vents.

Check that all site pipework is insulated.

Ensure power supply to the unit is switched on.
Once powered up, the controls will boot up and
the programme version will be displayed to the
right of the screen as detailed in Figure 34.
Figure 33: HIU controller and display
HIU Controller
and display
WARNING
The safety tempering valve at the bottom
of the unit is a factory set safety device and
should not be tampered with.
32
Figure 34: HIU start-up display
Programme version number

7.3 Commissioning procedure


Set the PICV to suit the design fl ow rate using
Figures 2 and 5 on pages 7 and 8 as shown in
Figure 55 on page 38.

Ensure that the installer settings have been
set to suit the installation and logged on page 54.
7.3.1 Hot water mode.

The HIU is factory set to operate the domestic hot
water (DHW) at 55
considered to be safe by the health and safety
executive. After the unit has initialized, it will sit in
standby mode with the back light on and the display
will show two dashes as shown in Figure 35 below.
Figure 35: HIU standby display

Press the OK button and the hot water set point will
be displayed as detailed in Figure 36 below.
Figure 36: DHW setting
C
Desired hot water
temperature

The hot water temperature setting can be adjusted
between 30 O C and 65
arrow buttons to change the setting as shown in
Figure 37 below. When setting up the DHW set
point, the tap symbol in the bottom right hand side
of the screen will fl ash.
Figure 37: DHW set point adjustment
C
O
O C, which is the temperature
O
O

O C. Press the up and down
O