Section 6: Commissioning, Draining Down and Safety
6.1
FILLING THE CYLINDER
! CAUTION !
Before filling the cylinder check that the immersion heater
has not loosened in transit. Tighten as necessary using
a shaped spanner. Stillsons or pipe grips should not be
used.
1. Ensure that all connections are fully tightened.
2. Ensure that the service valve in the cold water supply is
closed.
3. Open all hot water taps supplied by the cylinder.
4. Slowly open the service valve in the cold water supply.
5.
Continue to fill the cylinder until water flows from all taps
6. Open the service valve fully and close all the hot taps.
7.
Allow system to stabilise for five minutes.
8. Open each hot water tap in turn to expel air from the system
pipe work.
9.
Check for leaks.
10. Manually operate Temperature and Pressure Relief Valve
(12) – Figures 2-6 to 2-10, to ensure free water flow through
discharge pipe. (Turn knob to left).
11. Heat the water to chosen temperature and then close the
service valve.
12.
Drain the cylinder to flush out any flux/solder from the
installation process. Refer to Section 6.2 below.
13.
Re-fill the cylinder – as described above.
14. Re-heat cylinder to the required temperature and re-check for
leaks.
6.2
DRAINING DOWN
1.
Switch off the electrical power to the immersion heater
(important to avoid damage to the element).
2.
Switch off the heat pump (or boiler).
3.
Turn off the cold water service valve (or stop cock).
4. Open all hot water taps.
5. Open drain cock in cold water supply to drain unit down.
Refer to Figures 2-6 to 2-10, as appropriate.
6.3
IMMERSION HEATER SAFETY CUT-OUT
The immersion heater incorporates an independent non self-
resetting over temperature cut-out device to prevent excessive
water temperatures. Refer to Section 5.3 for further details.
The safety cut-out will operate if:
a. The wiring is incorrect.
b. The immersion heater thermostat or cylinder thermostat fails.
c. Thermostat is set too high.
To reset the safety cut-out:
1. Unscrew and remove the nut holding the immersion heater
cover in place.
2. Remove the immersion heater cover.
! WARNING !
Before removing the immersion heater cover, to either
reset the safety cut-out or check/alter the thermostat
setting, ensure that the electrical supply is isolated.
3. The safety cut-out reset pin is positioned to the side of the
control knob (indicated by a triangle with the word ‘safety’
below). Refer to Figure 5-1.
4. If the cut-out has operated, the reset pin will be pushed
upwards (to be level or slightly above the cover).
5.
Wait until the temperature has fallen sufficiently.
6. Investigate and identify the cause of the cut-out operation
and rectify the fault.
7. Press in the reset pin (to its normal operating position) to
reset the cut-out. Use hand pressure only with a suitably
sized implement.
8.
Refit the immersion heater cover correctly and secure in
position with retaining nut.
9. Switch the mains electricity supply back on.
If the problem persists, please contact your installer.
6 COMMISSIONING, DRAINING DOWN AND SAFETY
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Summary of Contents for HPMONO/IND125
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